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34results about How to "Realize non-destructive monitoring" patented technology

Bolt-based underground space surrounding rock disaster resistivity real-time monitoring method

The invention relates to a bolt-based underground space surrounding rock disaster resistivity real-time monitoring method and belongs to the mining and geotechnical engineering safety detection and monitoring technical field. According to the method, an underground space surrounding rock disaster resistivity real-time monitoring device is set and includes a power supply electrode, a measuring electrode, an electrical prospecting apparatus, a bolt and a main control computer; the main control computer is connected with the electrical prospecting apparatus; the power supply electrode and the measuring electrode are connected with the electrical prospecting apparatus through conductors; and the power supply electrode and the measuring electrode are connected with the bolt at an underground space surrounding rock monitoring area. According to the bolt-based underground space surrounding rock disaster resistivity real-time monitoring method, the bolt is adopted as a conductor to monitor the resistivity of an anchorage zone and surrounding rock; and the stability of the surrounding rock and anchorage zone is monitored according to the change of the resistivity. The method has the advantages of no damage to the surrounding rock, high accuracy, wide application range and the like.
Owner:SHANDONG UNIV OF TECH

Energy releasing and buffering real-time monitoring method for disaster of surrounding rock in underground space

The invention provides an energy releasing and buffering real-time monitoring method for a disaster of surrounding rock in underground space and belongs to the technical field of safety detection and monitoring of mining and geotechnical engineering. The method is characterized by adopting a monitoring system and comprising the following steps: step 1, fixing anchor bolts (1); step 2, mounting a surrounding rock inducing and buffering mechanism; step 3, mounting a surrounding rock displacement acquisition device; step 4, monitoring displacement of the surrounding rock (7); step 5, executing step 6 if the displacement of the surrounding rock (7) exceeds a preset threshold or meets a precursor mode, and executing step 4 otherwise; step 6, executing step 7 if the surrounding rock (7) has the probability of a surrounding rock disaster, and executing step 9 otherwise; step 7, predicting the range of the surrounding rock disaster; step 8, releasing the early warning level of the surrounding rock disaster; step 9, performing alarming by a master control computer. With adoption of the method, energy releasing, buffering and displacement of the surrounding rock are monitored, and the probability of accidents is reduced.
Owner:SHANDONG UNIV OF TECH

Binocular visual sense monitoring system for growth of multiple plants

The invention relates to a field of plant growth noninvasive monitoring technology and discloses a binocular visual sense monitoring system for growth of multiple plants. The binocular visual sense monitoring system for growth of multiple plants comprises an image acquisition apparatus, a horizontal movement apparatus and a rotary movement apparatus; the image acquisition apparatus includes two pick-up heads which are arranged apart for shooting plant growth changes; the horizontal movement apparatus comprises a supporting plate for horizontal linear motion. The rotary movement apparatus comprises a rotatory bench for horizontal rotation, and the rotatory bench is rotatedly connected to the supporting plate; the image acquisition apparatus is fixedly connected to the rotatory bench, two pick-up heads of the image acquisition apparatus are used for shooting pictures of growth of multiple plants, the horizontal movement apparatus and the rotary movement apparatus are combined, thereby realizing long-time timing noninvasive rapid measurement of external form characteristics of multiple plants, and the invention has the advantages of saved labor force, reduced labor intensity and improved measurement accuracy, thereby realizing noninvasive monitoring of plant growth characteristic parameters.
Owner:ZHONGKAI UNIV OF AGRI & ENG

Leaf color detection-based plant growth condition monitoring method

The invention discloses a leaf color detection-based plant growth condition monitoring method. On the basis of positive correlation between leaf color readings of plants and chlorophyll contents of the plants, the chlorophyll contents can be directly obtained through obtaining the leaf color readings. The method comprises the following steps of: obtaining plant blade images through shooting, and classifying plants by means of a pre-trained convolutional neural network classifier; analyzing colors of blades by using an image processing technology, and obtaining corresponding leaf color readings according to a model between leaf colors and leaf color readings, so as to obtain chlorophyll contents of the blades and obtain the growth conditions of the plants. Compared with the prior art, the method disclosed by the invention has the advantages of realizing lossless monitoring, having relatively strong reliability and being unconstrained by plant species.
Owner:浙江省柯桥中学

Non-intervention type paster filling pipeline block monitoring device and method

InactiveCN107064994AStrong measurement abilityRealize automated monitoringSeismologyAutomatic controlSingle chip
The invention discloses a non-intervention type paster filling pipeline block monitoring device and method. The device includes an ultrasonic wave monitoring device, a PLC and a computer. An ultrasonic wave emitting probe and an ultrasonic wave receiving probe of the ultrasonic wave monitoring device are arranged on two ends of a filling pipeline to be monitored. The ultrasonic wave emitting probe is connected with the ultrasonic wave emitting device. The ultrasonic wave emitting device is connected with a single-chip microprocessor. The ultrasonic wave receiving probe is connected with an ultrasonic wave receiving device. The ultrasonic wave receiving device is connected with the single-chip microprocessor. The other end of the single-chip microprocessor is connected with the PLC and automatically controls a paster filling pump system through the PLC. According to the invention, by mounting the above device provided by the invention in the middle of the filling pipeline to be monitored, wave speeds of different positions in the ultrasonic wave pipeline can be measured. When pipeline block occurs, the wave speed difference of ultrasonic waves in front of a pipeline block position and behind the pipeline block position is distinct, so that accurate positioning of the pipeline block position is realized. According to the invention, automatic monitoring and damageless monitoring of the paster filling pipeline block is realized.
Owner:TAIYUAN UNIV OF TECH

Concrete strength monitoring device and monitoring method

ActiveCN109239316AIntensity non-destructive monitoringNon-destructive monitoringMaterial testing goodsElectricityPrimary Indicator
The invention discloses a concrete strength monitoring device and a monitoring method. According to the device and the method, the initial wave velocity of concrete which is not subjected to erosion and the concrete wave velocity within different depth ranges under different erosion ages are monitored by embedding a piezoelectric smart aggregate in eroded concrete, damage processes such as chiseling concrete samples and the like are not needed to be carried out, and the strength of the piezoelectric smart aggregate itself is sufficiently compatible with concrete, thus the influence on the structural performance of the concrete is avoided, and therefore the nondestructive monitoring of the strength of the eroded concrete can be realized. Based on the concrete strength monitoring device, themonitoring method provided by the invention can monitor the concrete wave velocity in real time non-destructively; by monitoring the wave velocity at different depths of the eroded concrete and constructing a relationship between the wave velocity, dynamic elastic modulus and strength, the compressive strength condition of an eroded concrete structure in accordance with the engineering practice can be directly obtained, and then the concrete structure is subjected to health monitoring and safety assessment by taking the concrete strength as a primary indicator.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL

Intelligent greenhouse nectarine fruit growth rate wireless monitoring system based on embedded dual-camera platform

The invention discloses an intelligent greenhouse nectarine fruit growth rate wireless monitoring system based on an embedded dual-camera platform. The system comprises a dual-camera module, a dual-core processor and a remote server, wherein the dual-core processor comprises an ARM module and a DSP (Digital Signal Processor) module; the dual-camera module is used as signal input of the monitoringsystem and used for fruit image acquisition of nectarine; a signal output end of the dual-camera module is connected with an image signal input end of the ARM module; the ARM module and the DSP module are in bidirectional connection; the DSP module is used for processing the image data and extracting the volume of the nectarine fruit; and the ARM module communicates with the remote server througha 3G communication module. In the invention, two USB cameras are matched with the embedded technology and the 3G wireless transmission technology to perform remote real-time monitoring on the growth of the greenhouse nectarine fruit, and the problems in terms of data acquisition and data teletransmission in the detection process of fruit growth rate are solved.
Owner:NANJING AGRICULTURAL UNIVERSITY

Diaphragm compressor air pressure nondestructive monitoring system and method

The invention belongs to the technical field of compressors, and particularly relates to a diaphragm compressor air pressure nondestructive monitoring system and method. Due to the fact that a diaphragm compressor is high in operational pressure ratio and wide in pressure range, and the exhaust pressure can reach 300 MPa at most, if the method that pressure measuring holes are machined in a cylinder body is adopted, the strength of an air cylinder is affected, in addition, leakage can be caused, and therefore potential safety hazards are caused. The diaphragm compressor air pressure nondestructive monitoring system comprises a diaphragm assembly, an exhaust pipe, an air side cylinder head, a strain rosette circuit group, a strain gauge circuit and a data acquisition processing assembly, and is characterized in that the strain rosette circuit assembly is connected with the data acquisition processing assembly, and the strain gauge circuit is connected with the data acquisition processing assembly; the diaphragm assembly comprises a first diaphragm, a second diaphragm and a third diaphragm which are sequentially arranged, the strain rosette circuit group comprises a first strain rosette circuit, a second strain rosette circuit and a third strain rosette circuit; and nondestructive monitoring and diagnosis of the operation health state of the diaphragm compressor are realized.
Owner:XI AN JIAOTONG UNIV +1

Image-technique-based artificial wetland plant growth information extracting method

The invention discloses an image-technique-based artificial wetland plant growth and form change information extracting method, which comprises that: wetland plant image files (digital photos) which are acquired periodically are imported into a program and displayed on the screen of a computer, and the program converts a screen coordinate into an actual coordinate; a user acquires the plant profiles (by image edge recognition) and plant size (by plant projection area representation) through software operation for man-machine interaction; and by representing the information on images of the same group relative to a time axis, the growth curve of the plants on the artificial wetland can be drawn. The method has the advantage that by combining a digital imaging principle and adopting a computer image technique, software is designed and developed in a Visual C++ environment to monitor the growth of the plants on the artificial wetland without damaging the plants on the artificial wetland.
Owner:NANKAI UNIV

Fast resin wetting forming technology based on material flow prepeak monitoring

The invention discloses a fast resin wetting forming technology based on material flow prepeak monitoring on the basis of a traditional resin wetting forming technology. A system comprises a monitoring module, a vacuum pump, a vacuum tank, a sensor, electromagnetic valves A, electromagnetic valves B, a throttling valve, a die, a storage tank, filler, die releasing cloth, a flow guide net, a flow guide pipe, a pipeline connecting piece, sealing cloth, a feeding pipeline, a middle pipeline and a gas extraction pipeline. The technology process mainly includes the steps that the die is divided into multiple filling areas; the material flow prepeak position is monitored through the sensor in the monitoring module; sequential starting and stopping of all the pipelines are controlled in cooperation of a controller, and step-by-step filling is achieved for the different filling areas; and after all the areas are filled with sizing materials, curing forming is conducted, then die releasing is conducted, and a product can be obtained. Compared with a traditional technology, the fast resin wetting forming technology has the beneficial effects that sizing material prepeak lossless monitoring is achieved, and the automation degree is high; and the probability of filling defects such as incomplete wetting can be better lowered, and meanwhile the labor cost is reduced. The fast resin wetting forming technology is particularly suitable for processing and producing of various large thermosetting resin matrix composite materials of complex structures.
Owner:BEIJING UNIV OF CHEM TECH

Optical fiber sensor for simultaneously monitoring stress and corrosion rate of reinforcing steel bar

The invention belongs to the technical field of structural health monitoring or sensors, and discloses an optical fiber sensor for simultaneously monitoring stress and corrosion rate of reinforcing steel bars. The optical fiber sensor comprises a transmission optical fiber, a capillary reinforcing steel bar pipe, a long-period fiber grating, a flexible waterproof sealing material, an external bushing, a reflecting mirror surface, a connecting key and a clamp. According to the invention, the sensor comprehensively utilizes a Fabry-Perot resonator and a long-period fiber grating, indirectly monitors the stress and corrosion rate of reinforcing steel bars by simultaneously monitoring the change of reflection spectrum signals of the Fabry-Perot resonator and the long-period fiber grating under different reinforcing steel bar corrosion rates and reinforcing steel bar stress conditions, can realize long-term, lossless and real-time simultaneous monitoring of the stress and the corrosion rate of the reinforcing steel bars, is high in measurement precision and large in measuring range, has the advantages of being relatively simple to manufacture, small in size, high in strength, high in sensitivity and the like, has a wide application prospect, and is easy to popularize.
Owner:DALIAN UNIV OF TECH

Capsule for monitoring pH value of gastric acid by utilizing nuclear magnetic resonance imaging and preparation method thereof

ActiveCN111631686AStrong drug complianceEliminate interference from macromoleculesDiagnostic recording/measuringSensorsNMR - Nuclear magnetic resonanceNuclear magnetic resonance
The invention relates to the field of physiological index detection, in particular to a capsule for monitoring the pH value of gastric acid by utilizing nuclear magnetic resonance imaging and a preparation method thereof. The capsule comprises a capsule shell and a medicine arranged in the capsule shell, the capsule shell comprises a capsule cap and a capsule body which are connected through a thread, the capsule body is provided with a medicine containing cavity, and the capsule shell is made of gel as a raw material. The capsule disclosed by the invention can be orally taken and is high in drug compliance; interference of macromolecules in gastric juice can be eliminated, and meanwhile free in-out of hydrogen protons cannot be blocked excessively; the structure is special, structural images different from surrounding tissue are displayed, and therefore signals can be collected in vivo and the capsule can be tracked; the preparation method is simple and low in production cost; and most importantly, the MRI can assist in realizing nondestructive monitoring of pH value of gastric acid.
Owner:HUNAN UNIV

Tea yield prediction system and method

The invention provides a tea yield prediction system and method. The system comprises an image splicing module used for obtaining an orthographic mosaic image of a target tea garden; a tea bud classification and recognition module used for inputting the orthographic mosaic pattern of the target tea garden into a tea recognition model to obtain tea buds of different grades in the target tea garden,wherein a tea bud recognition model is obtained by training based on tea bud samples of different grades and preset labels of the tea bud samples; and a yield calculation module used for obtaining the total yield of the tea buds in the target tea garden according to the number of the tea buds corresponding to each grade and the single mass of the tea buds corresponding to each grade. The system adopts a non-contact and non-destructive mode with tea leaves, the tea bud quantity can be counted without picking tea buds, the tea buds are identified and counted in a machine learning mode, nondestructive monitoring is realized, the real-time performance is high, and the data precision is relatively high.
Owner:清远市智慧农业研究院

Steam turbine oil acid value nondestructive detection method based on intermediate infrared spectrum

The invention discloses a steam turbine oil acid value nondestructive detection method based on an intermediate infrared spectrum. The steam turbine oil acid value nondestructive detection method comprises the following steps of: acquiring infrared spectrum and acid value data of a steam turbine oil sample, and preprocessing the acquired infrared spectrum by adopting a chemometrics method; establishing a model of a relationship between an absorption wave band and an acid value in a sample spectrogram by adopting a partial least square artificial neural network method; and finally importing theinfrared spectrogram of the steam turbine oil to be detected into the model, and acquiring the acid value of the steam turbine oil to be detected through model analysis. According to the steam turbine oil acid value nondestructive detection method, a detection report of the turbine oil acid value can be obtained without destroying the sample, and turbine oil change and equipment fault analysis are guided.
Owner:XIAN THERMAL POWER RES INST CO LTD

Three-dimensional intelligent monitoring method for structure adjacent to existing station in new subway construction

Provided is a three-dimensional intelligent monitoring method for a structure adjacent to an existing station in new subway construction. The method is an optimization of space monitoring point selection, and comprises the following steps: selecting different monitoring sections between a subway construction area and the existing station, selecting a plurality of monitoring points on the same monitoring section, and drilling; arranging inclinometers, settlement meters and other instruments in the holes, so that the settlement deformation condition of the soil body near the existing station is obtained, according to the obtained soil body monitoring data, a pre-established prediction model about the existing station and subway construction is corrected, and the inclinometers and other monitoring instruments are arranged on the side wall of the existing station to monitor the deformation of the existing station. And the obtained monitoring data is used for checking the corrected model, so that the accuracy of the prediction model is determined, the prediction model realizes the extraction of deformation settlement data at any position of the existing station under different construction steps, and the position and the construction stage which have great influence on the deformation of the existing station in the whole construction process can be determined in advance.
Owner:CHINA RAILWAY TUNNEL GRP ROAD & BRIDGE ENG CO LTD +5

Cement-based conductive material for existing building strain monitoring and cement-based sensor

The invention discloses a cement-based conductive material for existing building strain monitoring and a cement-based sensor. The material comprises the following components in percentage by mass: 5-50% of water-borne epoxy resin, 20-80% of cement, 1-20% of conductive filler and 10-50% of water, the cement-based conductive material is brushed or sprayed on the surface of an existing building structure to form a cement-based conductive material coating, and a current loop is formed through a conductive electrode arranged on the surface of a building and a connected monitoring device. When the existing building is subjected to load to generate strain or crack, the strain or crack acts on the surface coating, different current signals are generated, and therefore real-time monitoring is achieved. The monitoring coating is high in signal-to-noise ratio of detection signals, small in relaxation phenomenon, stable in monitoring performance, simple in laying process and high in bonding strength with a building matrix, can be laid on the surface of any special-shaped structure, has good economic benefits and long-term social benefits, and is very wide in application prospect.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY

Nondestructive monitoring system and method for diaphragm of diaphragm compressor

The invention belongs to the technical field of compressors, and especially relates to a nondestructive monitoring system and method for a diaphragm of a diaphragm compressor. When the negative pressure compressed gas of the diaphragm compressor works, that is, both the suction pressure and the discharge pressure are less than the atmospheric pressure and the diaphragm is ruptured, the pressure ofthe chamber between the diaphragms is always less than the atmospheric pressure, and a pressure alarm used in a diaphragm monitoring program cannot be triggered, thus an existing method is invalid. The invention provides the nondestructive monitoring system for the diaphragm of the diaphragm compressor, and sequentially comprises an air cylinder, a diaphragm component, an oil cylinder and a dataacquisition processing component; the diaphragm component is tightly pressed and fixedly supported between the air cylinder and the oil cylinder; a diaphragm monitoring sensing component is arranged in a tight pressing and fixed supporting area; and the diaphragm monitoring sensing component is connected with the data acquisition processing component. During the operation of the diaphragm compressor, vibration or acoustic emission signals of the diaphragm are monitored, thereby achieving nondestructive monitoring and diagnosis of the operating health status of the diaphragm compressor.
Owner:XI AN JIAOTONG UNIV +1

Cable joint cable core temperature inversion method and system based on cable surface temperature

The invention provides a cable joint core temperature inversion method and system based on the cable surface temperature, comprising: step 1, performing radial temperature inversion according to the one-dimensional transient thermal circuit model of the cable and the surface temperature measurement point temperature of the cable body Step 2: Use the finite element temperature field simulation method to construct a two-dimensional cable temperature field simulation model, and simulate the cable core contact point and cable core at different loading currents and different times The transient temperature of the fitting point is obtained to obtain the transient temperature simulation data set; step 3, taking the transient temperature of the cable core contact point as the independent variable and the transient temperature of the cable core fitting point as the dependent variable, the transient temperature simulation data set Perform fitting to obtain the cable core axial temperature function; step 4, combine the cable core fitting point inversion transient temperature and the cable core axial temperature function to obtain the cable core contact point temperature. The present invention utilizes the surface temperature of the cable body to obtain accurate cable core contact point temperature through inversion and fitting, which is simple and convenient.
Owner:WUHAN UNIV

A Tube Wave Monitoring Method for Local Danger Relief Effect of Underground Engineering Dynamic Disaster

The invention discloses a tube wave monitoring method for the partial danger relief effect of dynamic disasters in underground engineering, which belongs to the technical field of mining and geotechnical engineering safety detection and monitoring. It is characterized in that it includes a tube wave monitoring system, the tube wave monitoring system includes a tube wave monitoring device (5) placed in the stress release hole (3), the stress release hole (3) is set in the surrounding rock (1), and the stress release hole (3) is set in the surrounding rock (1). The coupling agent (4) is injected into the release hole (3); the tube wave monitoring device (5) includes a receiving transducer (7) and a transmitting transducer (11) and is simultaneously connected with the receiving transducer (7) and the transmitting transducer A tube wave detector connected to the energy device (11). In the tube wave monitoring method for the local hazard relief effect of dynamic disasters in underground engineering, stress release holes are used to realize the combination of dynamic disaster hazard relief and monitoring, without the need for secondary drilling of surrounding rocks, with simple operation and post-analysis , high degree of automation and high accuracy.
Owner:SHANDONG UNIV OF TECH

Optical fiber sensor for monitoring aging of damping oil of viscous damper

The invention belongs to the technical field of sensors, and discloses an optical fiber sensor for monitoring the aging degree of damping oil in a viscous damper. The optical fiber sensor comprises a single-mode optical fiber, a stainless steel shell, an oil inflow small hole and a reflective end face. According to the sensor, based on the principle of multi-beam interference and the property that the light refractive index of the aged damping oil changes, the aging degree of the damping oil in the viscous damper is indirectly monitored by monitoring the change of reflection spectrum signals of a Fabry-Platino cavity under the condition of the light refractive index of the damping oil with different aging degrees. The sensor can realize long-term, lossless and real-time monitoring of the aging degree of the damping oil in the viscous damper, is high in measurement precision, and has the advantages of relatively simple manufacturing, small size, high strength, high sensitivity and the like. The sensor has a wide application prospect and is easy to popularize.
Owner:DALIAN UNIV OF TECH

A concrete strength monitoring method based on a concrete strength monitoring device

The invention discloses a concrete strength monitoring method based on a concrete strength monitoring device. The device and method monitor the initial wave velocity of the concrete when it is not eroded and the concrete wave velocity in different depth ranges under different erosion ages by embedding piezoelectric intelligent aggregates inside the eroded concrete, without the need to chisel concrete samples, etc. The destruction process, and the piezoelectric intelligent aggregate itself is strong enough to be compatible with concrete, so it will not affect the performance of the concrete structure, so that the non-destructive monitoring of the strength of the eroded concrete can be realized; the monitoring method provided by the invention can be real-time non-destructive monitoring Concrete wave velocity, by monitoring the wave velocity at different depths of eroded concrete, and constructing the relationship between wave velocity-dynamic elastic modulus-strength, the compressive strength of the eroded concrete structure in line with the actual engineering can be directly obtained, and then the concrete strength is used as the main index to measure Health monitoring and safety assessment of concrete structures.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL

Image evaluation method for screening waterlogging resistance of wheat in seedling stage

The invention relates to an image evaluation method for screening waterlogging tolerance of wheat in a seedling stage in the technical field of wheat waterlogging invasion monitoring, which comprises the following steps of: 1, planting a wheat seedling plant to be screened and evaluated in a planting pot convenient to move, and conventionally cultivating to a trefoil stage; 2, waterlogging the wheat seedlings in the trefoil stage with the basin for 10-20 days, then taking out the wheat seedlings with the basin, and naturally draining water; thirdly, front projection images of the wheat seedlings are shot; step 4, carrying out de-noising processing on the image by using Sciit-image software; 5, extracting a texture parameter value ASM of each image; and 6, judging the waterlogging resistance of the wheat seedlings according to the value of the ASM. According to the method disclosed by the invention, nondestructive identification and evaluation of the waterlogging damage in the seedling stage of wheat can be realized, rapid and intelligent evaluation is realized, and the identification efficiency is improved.
Owner:YANGZHOU UNIV

Fabry-Perot cavity type optical fiber sensor for monitoring concentration of chloride ions in concrete

The invention belongs to the technical field of structural health monitoring, and discloses a Fabry-Perot cavity type optical fiber sensor for monitoring the concentration of chloride ions in concrete. The sensor comprises an optical fiber sensing unit, a copper support and an optical fiber protective sleeve. The sensor is based on the principle of a Fabry-Perot interferometer, and indirectly monitors the chloride ion concentration and diffusion condition of a concrete protection layer in the depth direction by monitoring the change of interference spectrum signals of optical fiber sensing units with different burying depths in an optical fiber sensing unit array. The sensor can realize long-term, lossless and real-time monitoring of the chloride ion concentration in concrete, has high measurement precision, has the advantages of simple structure, small size, high strength, high sensitivity and the like, has a wide application prospect, and is easy to popularize.
Owner:DALIAN UNIV OF TECH

Ultrasonic multipoint real-time monitoring method for mine surrounding rock top plate disasters

The invention discloses an ultrasonic multipoint real-time monitoring method for mine surrounding rock top plate disasters and belongs to the technical field of safety monitoring and controlling for mining industry and geotechnical engineering. An ultrasonic multipoint real-time monitoring device is characterized by comprising a non-metal ultrasonic detector (1), a plurality of single-transmitting double-receiving dry hole energy converters (2), a multiple-point-location switching device (3), a main control computer (4) and a sound-light alarming device (5), the single-transmitting double-receiving dry hole energy converters (2) are connected with the multiple-point-location switching device (3) via connecting cables, the multiple-point-location switching device (3) is connected with the non-metal ultrasonic detector (1) via a connecting cable, the non-metal ultrasonic detector (1) is connected with the main control computer (4), and the main control computer (4) is connected with the sound-light alarming device (5). The ultrasonic multipoint real-time monitoring method for the mine surrounding rock top plate disasters has the advantages of high safety, high automation degree, wide application range, multiple-point-location monitoring, graded alarming and the like.
Owner:SHANDONG UNIV OF TECH

A Rapid Resin Infiltration Molding Process Based on Front Peak Monitoring of Material Flow

The invention discloses a fast resin wetting forming technology based on material flow prepeak monitoring on the basis of a traditional resin wetting forming technology. A system comprises a monitoring module, a vacuum pump, a vacuum tank, a sensor, electromagnetic valves A, electromagnetic valves B, a throttling valve, a die, a storage tank, filler, die releasing cloth, a flow guide net, a flow guide pipe, a pipeline connecting piece, sealing cloth, a feeding pipeline, a middle pipeline and a gas extraction pipeline. The technology process mainly includes the steps that the die is divided into multiple filling areas; the material flow prepeak position is monitored through the sensor in the monitoring module; sequential starting and stopping of all the pipelines are controlled in cooperation of a controller, and step-by-step filling is achieved for the different filling areas; and after all the areas are filled with sizing materials, curing forming is conducted, then die releasing is conducted, and a product can be obtained. Compared with a traditional technology, the fast resin wetting forming technology has the beneficial effects that sizing material prepeak lossless monitoring is achieved, and the automation degree is high; and the probability of filling defects such as incomplete wetting can be better lowered, and meanwhile the labor cost is reduced. The fast resin wetting forming technology is particularly suitable for processing and producing of various large thermosetting resin matrix composite materials of complex structures.
Owner:BEIJING UNIV OF CHEM TECH

Fabry-Perot optical fiber intelligent anchor rod for monitoring scouring depth of bridge pier

The invention relates to an intelligent anchor rod for monitoring the scouring depth of a pier based on a Fabry-Perot optical fiber pressure sensing unit, belongs to the field of structural health monitoring, and is particularly used for monitoring the scouring depth of the pier. The anchor rod comprises a Fabry-Perot optical fiber pressure sensing unit, an anchor rod and a multi-channel Fabry-Perot demodulator. The Fabry-Perot optical fiber pressure sensing unit comprises a single-mode optical fiber, a spring, a shell, a piston, a reflecting mirror surface, a circular plate, a partition plate, a connecting rod, an optical fiber hoop and an optical fiber protection hose. According to the device, based on the optical fiber Fabry-Perot interference principle, water pressure signals of different depths are converted into piston movement and further converted into adjustable optical signals, then the water pressure is measured through the piston spring mechanical balance relation, and thus monitoring of the scouring depth of the bridge pier is achieved. The device can realize long-term, lossless and real-time monitoring of the scouring depth of the bridge pier, has the advantages of high measurement precision, simplicity in manufacturing, small size and the like, has a wide application prospect, and is easy to popularize.
Owner:DALIAN UNIV OF TECH
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