213results about How to "Realize real-time online monitoring" patented technology

The invention discloses a real-time monitoring method for the thermal efficiency and gas characteristics of a gas boiler. According to the method, basic gas characteristics are amended through real-time operating data of the boiler, so that real-time gas characteristics are obtained and applied to the calculation of the thermal efficiency of the gas boiler, and the real-time on-line monitoring of the thermal efficiency and the gas characteristics of the boiler is realized. The real-time monitoring method overcomes adverse effects caused by fluctuation of the gas characteristics on the calculation of the thermal efficiency of the boiler and is more accurate than a traditional method in which the thermal efficiency of the boiler is calculated by testing the gas characteristics regularly; an expensive on-line analyzer is not required to be additionally added on site, and the real-time monitoring method can be realized by fully utilizing existing conditions of a power plant and has good implementability and operability; and boiler operators can be guided by results in real time for optimization and adjustment, the economic operation of the boiler is facilitated, and the purpose of energy conservation and consumption reduction can be achieved.

The invention provides a method for online monitoring capacitive voltage transformers. The method includes the steps that secondary voltage data of the capacitive voltage transformers of transformer stations in a monitored area are acquired based on an energy management system; the secondary voltage data are associated with information of transformer equipment corresponding to the transformer stations; failure state information of the capacitive voltage transformers is judged according to the secondary voltage data; operating states of the capacitive voltage transformers of the transformer equipment of the transformer stations in the monitored area are monitored according to the failure state information. According to the method for online monitoring the capacitive voltage transformers, hardware equipment does not need to be additionally arranged, the operating states of the capacitive voltage transformers can be online monitored in real time, monitoring cost is low, safe and reliable operation of an electric power system is not affected, and the method is suitable for being widely popularized and applied to the electric power system.

The invention belongs to an alarm for responding to a specific accident or abnormal condition, and particularly relates to an anti-external damage intelligent monitoring system for a power transmission line, which comprises a warning unit, a video acquisition unit, a data processing unit, a laser detection unit, a power supply control unit and a power supply unit, wherein the power supply unit provides power for the warning unit, the video acquisition unit, the data processing unit and the laser detection unit via the power supply control unit; and the data processing unit is connected with the warning unit, the video acquisition unit and the laser detection unit. The invention also provides an anti-external damage intelligent monitoring method for the power transmission line. Video analysis and laser detection technology are integrated; false and omissive reporting phenomena can be prevented; when a foreign object enters the monitoring area, a warning signal is triggered, whether an external intrusion behavior exits truly is judged again through the video acquisition unit, if the damage behavior truly exists, the warning unit is triggered for warning, and the warning information is transmitted to a monitoring center via the data processing unit.

The invention discloses a method which applies in a PLC control system to implement calcium spraying and desulfurization inside a circulating fluidized bed boiler, comprising the steps that outsourcing desulfurizer is transported and stored; a star unloader is used for feeding, a solid flowmeter is used for measuring, and a helicoidal pump is used for transporting; powder lot is blown into the boiler for calcination and desulfurization by a lobe fan; a flue gas SO2 sampling device is arranged on a chimney, the concentration value of SO2 which is measured by a monitor is uploaded to the monitoring network of environment protecting department in a wireless way by a data collecting instrument, at the same time, the concentration value of SO2 is transmitted to the PLC control system by the on-line monitor of the SO2; the frequency conversion rotating speed of a motor of the unloader in controlled by the PLC, so that the desulfurizer can be automatically added; wherein, the instantaneous and integrated flow of the solid flowmeter is transmitted to the monitoring network of environment protecting department by the PLC for being referred in real time. The method realizes the automatic control of a desulfurization system and on-line monitoring of the usage of limestone powder in real time, at the same time, the desulfurization efficiency is improved, thus remarkably saving the usage of limestone powder, reducing the running cost, and simultaneously lightening the labor intensity of operating staffs.

The invention relates to a section measuring buoy monitoring system comprising a buoy, an anchor chain, an anchor, a power supply system, a protection system, a data acquiring and transmitting system, a sensor system, a winch and a shore station receiving system. A water quality sensor and a pressure sensor are installed in a hanging cage; the sensor system monitors the site water and water surface meteorological data in real time; the data acquiring and transmitting system acquires, processes and transmits the monitoring data of the sensors to the shore station receiving system in a GPRS / CDMA / satellite wireless transmission manner. The section measuring buoy monitoring system has the advantages that data are acquired in real time, water ecological environment parameters are acquired in real time, and the real-time online monitoring of the water ecological environment is implemented; by means of the section measuring buoy monitoring mode, the water quality parameters of the water surface can be monitored, the longitudinal water quality parameters can be monitored, measurement can be performed in manners of determined depth and time and multiple points, the water environment change can be grasped in real time, and significance is provided for water monitoring.

The invention discloses an environmental risk preventing and controlling and contaminated site repair method for a gasoline station. The method comprises a daily monitoring pre-warning system of the gasoline station for realizing online monitoring of soil and underground water; a site environment characteristic analyzing system for realizing comprehensive site environment investigation and accumulating related parameters such as hydrogeological parameters for a 3D building design; a 3D model design system for site monitoring and risk estimation, defining the boundary and contamination degree of the site contamination by simulating a relocation diffusion process of contaminants in soil and an underwater medium and realizing three-dimensional visualization; and a contaminated site ecological repair system for realizing precise injection of a repair agent and degrading the contaminants in soil and underground water to achieve a set repair target by virtue of a 3D model design result by using an in-situ biological method. The method disclosed by the invention has the beneficial effects that the environmental risk of soil and underground water of the gasoline station is monitored and pre-warned in real time, site risk is estimated and the contaminated site is ecologically repaired.

The invention relates to a real-time food freshness monitor and a monitoring method thereof. the real-time food freshness monitor is characterized by comprising a master control module, a data acquiring module, a wired sensor, a wireless sensor, a network communication module and a power source module, wherein the master control module is connected with the data acquiring module, the data acquiring module is respectively connected with the wireless sensor and the wired sensor, the master control module is connected with the network communication module, and the network communication module is connected with a remote monitoring center by means of radio communication. The monitoring method includes steps of building a food freshness calculating model; calculating real-time nutrient of food; online monitoring and adjusting proper food storage environment conditions in real time, and transmitting the conditions to the remote monitoring center. By the real-time food freshness monitor and the monitoring method thereof, food freshness can be monitored online in real time, food storage period can be reliably predicted and transmitted to the remote monitoring center, and accuracy, reliability and timeliness of food freshness monitoring are improved.

The invention provides a fault monitoring method for a secondary circuit of a metering current transformer. The method includes the steps that 1, a high-frequency voltage signal Uh is injected into the secondary circuit of the monitored metering current transformer; 2, a current signal I2 in the secondary circuit is measured and divided into a power frequency current signal Ip and a high frequency current signal Ih; 3, AD conversion is carried out on the Ip and the Ih; 4, the ratio I gamma of the positive amplitude value and the negative amplitude value of the Ip within a power frequency current period is calculated; 5, the admittance Yh of the secondary circuit is calculated and is equal to Ih / Uh; 6, the electric energy value Ec is calculated according to the Ip and the power factor cos phi and the power frequency voltage Up of an electric energy meter of the secondary circuit of the monitored current transformer; 7, the difference value delta E within the time interval T is calculated and is equal to the difference between the Ec and Em; 8, the fault type of the secondary circuit of the monitored current transformer is judged according to the ratio I gamma, the difference value delta E and the admittance value Yh. The method is simple and reliable, faults of the secondary circuit of the monitored current transformer are monitored in real time and online, and the fault position and fault type of the circuit are judged and recognized.

The invention discloses a real-time and online method for lossless and precise measurement of storage batteries. The invention uses a low frequency and alternating signal generator to infuse the storage battery with low frequency and alternating signal, thus measuring the low frequency and alternating voltage at both ends of the storage battery, the low frequency and alternating electric current through the storage battery, and the phase difference between both ends. The invention achieves reliable real-time and online monitoring, provides rich and timely operating data to people who maintain the service of storage batteries, and greatly improves the maintenance level of the service of storage batteries, and the invention is markedly characterized by reliable data acquisition and precise detection of the essential resistance of storage batteries.

The invention relates to a self-monitoring conical ball bearing for a generator, and belongs to the technical field of bearings. An excitation disk embedded with an excitation magnet I and an excitation magnet II is arranged on an outer ring; a right clamping plate is arranged on an inner ring; a thermocouple, a circuit board and a left clamping plate are arranged on the right clamping plate; a metal film is pressed between the left clamping plate and the right clamping plate; a piezoelectric film is adhered to the metal film to form an energy harvester; an excited magnet I is arranged on the energy harvester and is positioned in a guide hole in the left clamping plate; a pressing plate presses a disk-type spring, an excited magnet II and a piezoelectric body for measuring the rotating speed into a blind hole in the left clamping plate in sequence; the piezoelectric body, the energy harvester and the thermocouple are respectively connected with the circuit board through wire groups. The self-monitoring conical ball bearing for the generator has the advantages and the characteristics that automatic power supply, sensing and monitoring functions are realized, the structure of mounting equipment is not required to be changed, and true real-time and on-line monitoring can be realized; configuration parameters of the structure of energy harvester and the excitation magnets are reasonably determined, and the power supply and generation capacity is high; by the adoption of the guide hole, the excited magnets can be prevented from being twisted, and the reliability of the energy harvester is improved.

The invention provides a method for locating the leakage position of an ore pulp conveying pipe, relates to a conveying control method, in particular to the method for determining the leakage position when the conveying pipe is blocked in the long-distance iron concentrate ore pulp conveying process. According to the method, by the adoption of a negative-pressure wave method, when the iron concentrate pulp pipe generates leakage, concentrate pulp at a leakage point flows away rapidly due to the difference between the internal pressure and the external pressure of the pipe, and pressure drops down; liquid on both sides of the leakage point is supplemented to the leakage point due to the pressure difference; the above processes are sequentially passed to an upstream pump station and a downstream pump station through the concentrate pulp pipe, that is, negative-pressure waves propagating at a certain speed are generated at the leakage point; and the position of the leakage point can be worked out according to the time difference generated when negative-pressure weaves generated at the leakage point are propagated to the upstream pump station and the downstream pump station and the propagation speed of the negative pressure waves in the pipe. The method has the beneficial effects of being less in required devices, low in operation cost, simple in operation and the like and is superior to an existing method for determining the leakage position of the pipe.

The invention relates to a multi-passage direction selecting flow-injection quick analysis system for hexavalent chromium water quality. A photoelectric flow cell, a reaction tube, an injection pump, an indicator storage bottle and a carrier fluid storage bottle are connected with a multi-passage direction selecting valve through a capillary pipeline; a valve cover of the multi-passage direction selecting valve is provided with a direction selecting connector which can be communicated with one of connectors of an upper valve seat through the rotation of the valve cover; the direction selecting connector of the valve cover is connected with the injection pump through a capillary storage pipe; the connectors of the valve seat are connected with the reaction tube, a water sample source, two guide samples, the indicator bottle and the carrier fluid bottle respectively; and the photoelectric flow cell is connected with an outlet of the reaction tube. The system makes the quantitative water sample and the diphenylcarbazide indicator continuously flow along with the carrier fluid in a continuous flow-injection mode; the water sample and the indicator diffuse in the carrier fluid and react to generate red fluid; and the content of hexavalent chromium in the water sample is measured through the photoelectric flow cell. The system has the advantages of simple structure, convenient operation and quick measurement, and is applicable to on-line real-time monitoring of the hexavalent chromium water quality.

The invention belongs to the technical field of rail traffic vehicle and high-voltage electrical equipment on-line insulation monitoring and especially relates to a multiple-unit train high-voltage equipment insulation state on-line monitoring system, which is used for realizing on-line monitoring of the insulation state of 25 kV high-voltage equipment of a multiple-unit train. Through classification of multiple-unit train high-voltage equipment, characteristic quantity screening, wireless transmission, high-voltage induction power obtaining, expert database and fuzzy function operation, the difficulty that a conventional power system on-line insulation monitoring mode cannot be applied to the multiple-unit train, which is characterized by high-speed movement, single-phase power supply, non-single-point grounding, harsh environment and strict requirements and the like, is solved; and the system comprises a data acquisition unit and an analysis and diagnosis unit. The data acquisition unit is used for extracting characteristic quantity of a monitoring object, and transmitting the data in a wireless manner to the data analysis and diagnosis unit for analysis and diagnosis and signal output. The system is reliable in principle, high in precision, high in accuracy, high in safety and good in reliability, is of great significance to promotion of continuous development of the high-speed rail cause, and has good economic benefits and a broad market prospect.

The present invention relates to real-time monitoring method of random loss rate of combine. Feeding sensor, seed collecting amount sensor, seed loss sensor and grain moisture sensor are used simultaneously the acquire loss rate related signals, the signals are regulated, A / D converted and transmitted to computer for processing and analysis, and the results are fed via interface circuit to display and alarm device for the display and alarm of feeding amount, straw / grain ratio, grain moisture, separation loss rate, sorting loss rate and total loss rate. The present invention can measure the random loss rate and monitor the main factors to affect the loss rate and thus the operation state of the combine, so as to ensure the high operation quality of the combine.

The invention discloses a by-passage super critical water oxidation environment pH value online measuring method and dedicated apparatus thereof characterized by that, filling a standard solution into the electrochemical cell through a pH sensor, filling a reference solution into the electrochemical pool through a reference electrode, obtaining the electrode potential E1 of the pH value sensor in relative to the reference electrode, filling another standard solution into the electrochemical cell through the pH sensor, obtaining the electrode potential E2 of the pH value sensor in relative to the reference electrode in the same manner, stopping the filling of the standard solution, filling the test solution into the electrochemical cell, at the same time filling the reference solution into the reference electrode, obtaining the electrode potential test of the pH value sensor in the test solution environment in relative to the reference electrode, obtaining the pH-test value of the measured solution according to the high temperature calculating formula.

The invention relates to a multi-state gas-liquid optical fiber sensor for detecting pressure, temperature and component concentration simultaneously. The sensor consists of a broadband light source, a spectrum analytical instrument, a return light guide optical fiber, a first light guide optical fiber, an optical fiber coupler, a second light guide optical fiber and a sensing optical fiber probe, wherein a temperature cavity for detecting the temperature of liquid or gas to be detected, a pressure cavity for detecting the pressure of the liquid or gas to be detected, and a component concentration cavity for detecting the component concentration of the liquid or gas to be detected are formed on the sensing optical fiber probe; fiber Bragg gratings with different reflection wavelengths arearranged in the temperature cavity and the pressure cavity; the temperature and pressure information of the liquid or gas to be detected is detected by detecting the change of the reflection wavelength of each fiber Bragg grating; an evanescent field sensing area is formed on an optical fiber section in the component concentration cavity; and the component concentration of the liquid or gas to bedetected is obtained by monitoring the attenuation degree of light intensity of a corresponding wavelength section in an optical fiber through the interaction of an evanescent field and the liquid orgas to be detected.

The invention discloses a real-time online cavitation monitoring and warning system and a real-time online cavitation monitoring and warning method for a water pump of a thermal power station. The real-time online cavitation monitoring and warning system comprises an external monitoring unit, the monitoring objective water pump, a pipeline flow sensor, a pump upstream temperature sensor and a pump upstream pressure sensor. The external monitoring unit is connected with a DCS (distributed control system) of the power station. The real-time online cavitation monitoring and warning system and the real-time online cavitation monitoring and warning method have the advantages that the external monitoring unit is bidirectionally communicated with the DCS of the power station via a standard industrial MODBUS serial port supported by the conventional DCS of the power station, measured signals, which are transmitted by the DCS of the power station, of the pipeline flow sensor, the pump upstream temperature sensor and the pump upstream pressure sensor are received, pump cavitation check results are transmitted to the DCS of the power station, prompting and warning effects can be realized by the aid of built-in warning and prompting modules of the DCS of the power station, and operation staffs can be prompted; the real-time online cavitation monitoring and warning system and the real-time online cavitation monitoring and warning method have an important significance on upgrading the equipment management level of a thermal power plant, prolonging the service life of critical equipment and reducing the maintenance and repair costs.

The invention discloses a thick loose rock-soil layer bottom water injection sedimentation deformation analog device and method. The thick loose rock-soil layer bottom water injection sedimentation deformation analog device is characterized in that the two ends of a model barrel of the device are connected to flanges, and the two sides of the model barrel are connected to a water drainage flange and a pressure measuring pipe; a constant-pressure water injection pump is connected to a water source, the other end of the constant-pressure water injection pump is connected to a flowmeter, the other end of the flowmeter is connected to a water injection pipe which is connected to a water injection floral pipe in the model barrel, the bottom of a cavity is connected to a perforated plate, an optical cable is connected to a fiber grating sensor, and the other end of the optical cable is connected to a fiber grating demodulator, a computer and remote transmission equipment. The sedimentation analog method comprises the steps that the constant-pressure water injection pump is used for injecting water so as to cause the sedimentation and the deformation of a thick loose rock-soil layer, a light source in the demodulator is applied to the sensor, the demodulator is used for converting an optical signal returned by the sensor into a wavelength value and sending the wavelength value to the computer, the wavelength drift distance is calculated, and the wavelength value is converted into an internal stress value of the thick loose rock-soil layer. The thick loose rock-soil layer bottom water injection sedimentation deformation analog device has the advantages of being complete in monitoring, high in testing flexibility, repeated in manufacturing and wide in suitability for the research of a sedimentation problem of coal mines, foundation ditches, side slope roads and railways, and the wireless data transmission can be realized.

The invention discloses a dry desulfurization process with automatic control realized based on a monitoring network for environmental protection and a digital meter; wherein, the process comprises the steps that: a gate valve arranged below a bin is opened, and a discharger is started; powder enters an air lock and wind powder mixing device after being metered by a flow meter and then is blown into a boiler by a blower through a closed pipeline; after going through a ,pyrolysis, the powder reacts with SO2; a flue gas monitoring device arranged on a chimney transmits the monitored concentration value of SO2 as an analog quantity output signal to a PLC control system; according to the analog quantity output signal, the rotating speed of an electric motor of the discharger is controlled by the PLC control system to regulate the feeding; the instant flow and accumulated flow value provided by the flow meter arranged on a powder conveying pipeline are uploaded as an analog quantity signal to the PLC control system; on one hand, the instant flow and accumulated flow value function as data storage of the PLC control system, and on the other hand the data are transmitted in real time to an online monitoring network for environment-protection department. In the dry desulfurization process, the environmental-protection department realizes a distant monitoring of the dosage of desulfurizer, thus saving the dosage of limestone powder saved and simultaneously lowering the working intensity of the operating stuff.

The invention discloses an intelligent analysis method based on distributive optical fiber temperature measurement. The intelligent analysis method based on the distributive optical fiber temperature measurement comprises the following steps that partitioned management is conduced on a temperature measurement cable, and an optical fiber temperature measurement device is installed; an alarming parameter is set in a background data processing system, and the distributive optical fiber temperature measurement device reports the real-time temperature measurement data; every time a current temperature value is received, a system conducts temperature jump analysis once on the temperatures collected in each partition area, and if an analysis value exceeds a threshold value, temperature jump alarming is conducted; every time the current temperature value is received, the system conducts slow change analysis, the temperature is compared with the highest temperature, the lowest temperature, the environment temperature, the average temperature difference and a temperature difference of each partition area, and when the temperature values exceed set numerical values, slow change temperature alarming is conducted. According to the intelligent analysis method based on the distributive optical fiber temperature measurement, analysis and filtering are conducted on the sudden change and the slow change of the temperature, when the operation state of the cable and the temperature of the surroundings fluctuates abnormally or a fault is caused, early warning can be automatically conducted, and the safety operation level of a power cable is further improved.

The invention discloses a fully distributed device and a method for monitoring underground working temperature of an oil-water well based on a Raman scattered light time-domain reflectometer, which relate to the technical field of laser monitoring and aim to solve the problem that only single-point temperature monitoring can be performed while real-time online monitoring cannot be performed in conventional oil-water well underground temperature monitoring. The device of the invention comprises the Raman scattered light time-domain reflectometer, an application circuit, a data acquirer and a computer processing system. The method of the invention comprises that: optical signals are output by a laser, and are coupled to Raman optical fibers distributed on an oil pipe through a wavelength division multiplexer, and returned backscattered light passes through the wavelength division multiplexer, and outputs signals to a photoelectric detector; and the photoelectric detector detects the power of the backscattered light, outputs the power of the backscattered light to the amplification circuit for amplification, and outputs the amplified power to the data acquirer and the computer processing system to obtain the length of the part, extended into the oil-water well, of the oil pipe and a corresponding temperature absolute value and display the length and the absolute value on a computer screen so as to realize the distributed, real-time and online temperature monitoring. The device and the method are applied to the monitoring of the underground working condition temperature of the oil-water well.

The invention relates to a full-automatic quick measurement system and method for water quality hexavalent chromium. A first electromagnetic valve is connected with a hexavalent chromium standard solution and a second electromagnetic valve and then is connected to a first joint of a six-way valve through a peristaltic pump; the second electromagnetic valve is connected with a standard sample; a second joint of the six-way valve is connected with a fifth joint through a quantifying ring; a sixth joint of the six-way valve is connected with waste liquid; a third joint of the six-way valve is connected to current carrying liquid through the peristaltic pump; a fourth joint of the six-way valve is connected with one end of a reaction pipe and a development agent passing through the peristaltic pump respectively through a three-way mixing machine; a third electromagnetic valve is connected to the other end of the reaction pipe and air respectively; and the third electromagnetic valve is also connected to the waste liquid through a photoelectric detection device. The full-automatic quick measurement system has the advantages of simple flow path design, pure digital photoelectric detection, bubble interference elimination and the like; and furthermore, a programmable logic controller (PLC) is used, so that the fault rate of an instrument control system is greatly reduced, and an instrument can really carry out unmanned full-automatic measurement.

The invention provides a method for on-line monitoring of a load current of a GIS bus of a substation. The method comprises the steps that a distribution diagram of GIS device intervals is drawn according to site layout information of a GIS of the substation, and the GIS bus is sectioned according to the distribution diagram and the actual physical information of the substation; the load current of each line and the quantity of states of switches and disconnecting links of the substation are obtained from an EMS system; the load current of each subsection of the GIS bus is calculated according to the Kirchhoff law, the load currents and the quantity of states; on-line monitoring is conducted on the GIS bus according to the load current of each subsection of the GIS bus of the substation. According to the technical scheme, real-time on-line monitoring of the load current of each subsection of the GIS bus of the substation is achieved, more direct state parameters in the GIS operation process are obtained, more reliable data reference is provided for infrared detection and GIS tests, stable operation of the GIS device is guaranteed, and the reliability of power supply of the power system is improved.

The invention relates to a floating plant radar detection system. According to the radar based floating growth plant monitoring system, difference in microwave echo intensity between a floater and thewater surface is used, the area of a floating plant flowing through a monitoring point is measured and calculated in real time via high resolution, a growth model of the plant is established according to the areas of the plant through different monitoring points, and prediction and whole basin monitoring are realized.

The invention discloses a motor vehicle pollution source online monitoring system. The system comprises a transceiver end and a reflecting end installed at two sides of a road. A light path measuring area between the transceiver end and the reflecting end is located on an empty section of the road. The system comprises a data collector, a motor vehicle exhaust gas pollutants online monitoring module communicating with the data collector, an environment and climate parameter monitoring instrument, a noise monitoring module and a vehicle flow statistic module. The output end of the data collector can be connected with a data center platform. The motor vehicle exhaust gas pollutants online monitoring module uses the combination of infrared laser and ultraviolet laser to measure total emission of motor vehicle exhaust gas pollutants above the road, and comprises a gaseous pollutant monitoring module and a particle monitoring module. The motor vehicle pollution source online monitoring system uses the modular design, integrates multiple types of front end monitoring equipment, is capable of fast and correctly determining the pollution sources, needless of personnel keeping watching in the operation process. The system achieves the real time online monitoring of comprehensive environment such as air, sound, climate and vehicle.

The invention proposes a remote data acquisition system for oil and gas pipelines based on the Internet of Things, including data acquisition nodes, data convergence nodes, cloud servers, and cloud control software. The data acquisition nodes are used to collect signal data of oil and gas pipelines. .15.4 The standard wireless sensor network protocol uploads the signal data to the data aggregation node. After the data aggregation node responds to the request, it uses the GPRS function of SIM900A to send the collected pressure, flow, temperature and other data to the TCP port of the cloud server; using Log in to the remote data acquisition system for oil and gas pipelines based on the Internet of Things with a browser, and click the graph data display area to easily view the real-time signal data of oil and gas pipelines, which can well display the signal data collected by the wireless sensor network; get rid of the use of the sensor network alone Due to the limitation of scale and distance, remote real-time data acquisition of oil and gas pipelines is realized all day long.

The invention relates to the technical field of structural health monitoring and discloses a method for monitoring structural damage of a conduit offshore platform. A piezoelectric sensor network arranged on the conduit offshore platform is utilized, one of two adjacent piezoelectric sensors serves as an active sensor, and the other one of two adjacent piezoelectric sensors serves as a driver. The method comprises the following steps of: performing synchronous frequency sweep excitation on the two piezoelectric sensors; measuring to obtain electromechanical coupling impedance or admittance of the active sensor through an impedance analyzer, and detecting damage conditions between the two piezoelectric sensors according to the change of an impedance signal; and finally, scanning the whole sensor network coverage area to monitor the damage of the key stress part or an easily damaged part of the conduit offshore platform. According to the method, the self-impedance and cross-impedance information is combined, the structural damage detection sensitivity and damage positioning accuracy are improved, and the method has positive significance on reducing the potential safety hazard and operating risk of the offshore platform structure and improving the overall economic benefits of the offshore oilfield development.

The invention belongs to the technical field of electronic measurement and relates to a method for measuring stress-strain of a cross arm of a power tower, in particular to a method for measuring the deformation of duckbill-type cross arm primary sheets. The method of the invention comprises the following steps: attaching the fiber Bragg grating to the primary materials of the cross arm; converting the linear strain of each primary sheet of the cross arm into a wavelength displacement of the fiber Bragg grating; connecting the fiber Bragg grating with a signal processor; and computing the displacement of the central wavelength of the fiber Bragg grating by means of the demodulator of the signal processor. The measurement method of the invention has the advantages of accuracy and reliability and can reflect the complex stress situations of the cross arm and realize real-time on-line monitoring.

The invention discloses an overhead-power-transmission-line sag online monitoring method based on a UWB ranging technology. The method includes the following steps: step1: selecting a position to install a UWB ranging device; step2. the UWB device performing ranging; step3. processing measured data and performing sag calculation. The method has the advantages of being high in measurement precision and great in reliability.