38results about How to "Fast measurement response" patented technology

The invention discloses a system and a method for quantitatively estimating HIFU (High Intensity Focused Ultrasound) damage viscoelasticity through pulsed acoustic radiation force shear waves monitored by a laser Doppler. According to the system, a synchronizing signal control system is connected with an arbitrary waveform generator and a high-speed data acquisition card, and the arbitrary waveform generator is connected with a high intensity focused ultrasound transducer by virtue of a power amplifier and an impendence-matching network; the high intensity focused ultrasound transducer is arranged outside a water tank, and detected imitated body tissues are arranged inside the water tank and connected with one three-dimensional movement device; laser Doppler equipment is arranged outside the water tank and connected with another three-dimensional movement device; and the output end of the laser Doppler equipment is connected with a PC (Personal Computer) via the high-speed data acquisition card. According to the system disclosed by the invention, single pulse acts on the imitated body tissues, so that ultrasonic action time and ultrasonic radiation dose can be effectively reduced;the acoustic radiation force shear waves are tracked by utilizing laser Doppler, the wave velocity and attenuation coefficient of the shear waves are obtained by using a 2D-FT algorithm, the shearingmodulus of elasticity and shear viscosity coefficient are further analyzed, and the defects of the conventional SDUV (Shearwave Dispersion Ultrasound Vibrometry) method are overcome.

The invention provides a double-sensitization high-sensitivity FBG temperature sensor and a manufacturing method thereof, and the sensor comprises three cylindrical metal tubes, one of the cylindrical metal tubes is a metal housing, the inner diameter of the cylindrical metal tube is slightly larger than the outer diameters of the other two metal tubes, and the middle part of the cylindrical metal tube is provided with a plurality of through holes. Two small metal tubes are connected through epoxy resin glue and embedded into a large metal shell by a certain depth, so that a section of cavity exists in the metal shell, four through holes are formed in the cavity of the metal shell, and the fiber bragg grating is installed in the three metal tubes which are connected in series through glue in a bonding mode. The grating is coated with colloid with a high thermal expansion coefficient; and the high thermal expansion characteristic of the organic polymer on the outer side of the FBG and the influence of thermal expansion and contraction of the metal on the central wavelength are utilized to realize dual temperature sensitization of the FBG, and the response speed and the sensitization effect of the FBG temperature sensor are improved.

The invention relates to a gas measurement method and a gas measurement device, which are mainly used for detecting gas parameters. The device comprises an analysis unit and a laser, a sensor, a convergent component and an optical reflector which are arranged inside a supporting device, wherein, the sensor is connected with the analysis unit. The measurement method is as follows: the laser gives out laser to the convergent component which is obliquely arranged; the laser is converged by the convergent component, passes through gas to be measured and then is emitted to the optical reflector; after the laser is reflected by the reflector, the laser passes through the gas to be measured and the convergent component again and is then received by the sensor; and the sensor transmits received signals to the analysis unit, and the parameters of the gas to be measured are obtained through analysis of the analysis unit. The gas measurement method and the gas measurement device have the advantages of advanced method, reasonable and skillful light path design, low optical noise, small number of parts, high measuring precision, convenient assembly and stable and reliable operation.

The invention discloses a sensor circuit for detecting the thickness of a sunscreen. The sensor circuit comprises a UV generation and control circuit, a UV photoelectric detection and control circuit,a micro current amplifying circuit, a microprocessor and an auxiliary circuit; the UV generation and control circuit is electrically connected with the microprocessor and is controlled by the microprocessor; the UV photoelectric detection and control circuit is electrically connected with the micro current amplifying circuit; the micro current amplifying circuit is electrically connected with themicroprocessor; the auxiliary circuit is electrically connected with the microprocessor so as to provide power for the whole circuit; and an optical filter is connected with the UV generation and control circuit and the UV photoelectric detection and control circuit. With the sensor circuit of the invention adopted, measurement is performed on portions requiring sunscreen application when a useruses the sunscreen, so that whether the sunscreen is applied to the portions can be detected, and the thickness of the applied sunscreen can be detected, and therefore, the user can use the sunscreento avoid being burnt by ultraviolet rays.

The invention discloses a grain moisture online detection circuit. The grain moisture online detection circuit comprise a power supply circuit, a constant-current source circuit, a single-chip microcomputer system, a signal amplification circuit, a Nixie tube display circuit, a motor anddrying machine control system, a control knob, a key circuit and a temperature compensation circuit, wherein the signal amplification circuit, the Nixie tube display circuit, the motor and drying machine control system, the control knob, the key circuit and the temperature compensation circuit are connected with the single-chip microcomputer system through data lines, the power supply circuit is connected with the other circuits, the constant-current source circuit is formed by connecting a voltage stabilizing circuit and a constant-current source measuring circuit, and the output end of the constant-current source circuit is connected with the signal amplification circuit. The grain moisture online detection circuit has the advantages that the measuring response speed is high, precision can be as high as + / -0.5%, manpower source waste can be reduced, the production cost is reduced, measuring results are accurate and the practicality is high.

The invention provides a temperature control device for a BOD (Biochemical Oxygen Demand) tachymeter adopting a microorganism electrode method, which comprises a temperature control cavity arranged in a box body of the tachymeter and is characterized in that the temperature control cavity heats gas to mix the gas in the cavity in a convection way so as to control the temperature in the cavity. The temperature control device is characterized in that the temperature control effect is stable, the detection precision is high, and the using period is long.

The invention discloses a three-dimensional coordinate acceleration measuring circuit, which comprises an X-axis acceleration measuring circuit Ax, a Y-axis acceleration measuring circuit Ay, a Z-axis acceleration measuring circuit Az, and a data processing MCU (microcontroller unit). The three-dimensional coordinate acceleration measuring circuit has the advantages that the measuring response is high, the acceleration data in each direction can be quickly and synchronously obtained, the reference is effectively and quickly provided for the judgment of a mechanical diagnosis system, and the occurrence possibility of mechanical fatigue faults is reduced.

The invention relates to the technical field of laser devices, in particular to a device and method for measuring a multi-longitudinal mode laser resonant cavity FSR by large-amplitude laser self-mixing vibration signals. The device comprises a multi-longitudinal mode laser device, a vibrating target, a transmission mechanism, a motor, a signal generator, a beam splitter, a photoelectric detector,a signal preprocessing unit and a signal processing unit, the multi-longitudinal mode laser device emits laser to the vibrating target, by the signal generator, the motor and the transmission mechanism, the vibrating target linearly moves in a reciprocating manner, while linearly moving in a reciprocating manner, the vibrating target receives laser emitted from the multi-longitudinal mode laser device and feeds back the laser into a resonant cavity of the multi-longitudinal mode laser device to form the laser self-mixing vibration signals, the beam splitter splits the self-mixing signals to the photoelectric detector, and the output end of the photoelectric detector is successively connected with the signal preprocessing unit and the signal processing unit. Non-contact real-time high-precision measurement can be realized, the measurement device is simple in structure, measurement response speed is high, and measurement precision is also high.

The invention discloses an electrical control device and a hydraulic control device in a runway surface friction coefficient testing car, relating to an automatic controller system, wherein the electrical control device comprises an upper computer, a lower computer, a relay, a power supply, a printer, an amplification conditioning module, a sensor, a signal converting circuit, an auto speed pulsesignal exit side and a braking signal exit side; wherein the upper computer is an industrial control computer the lower computer is a PLC computer, and the sensor comprises a horizontal force sensor,a vertical force sensor and a water pressure sensor. The hydraulic control device uses a hydraulic cylinder two-way connecting vessel and is composed of a hydraulic pump station, a three-position four-way electromagnetic directional valve, a pressure testing adapter, a hydraulic energy storage, a hydraulic cylinder, an electromagnetic directional ball valve, a hydraulic lock, a valve block and a travel switch, wherein the hydraulic cylinder is a two-way connecting vessel and consists of a rodless cavity, a rod cavity, a piston and a piston rod in the hydraulic cylinder. The invention greatly increases the measurement response speed, the control ability and the data processing ability and obviously reduces measurement errors.

The invention discloses a pulse-based multi-node gating monitoring system. The pulse-based multi-node gating monitoring system comprises a measuring device which is composed of an industrial computer, a digital I / O (input / output) card and a digital acquisition card, one end of a first cable is connected with a board card interface of the measuring device, the other end of the first cable is connected with a second aviation plug of a master unit control box, one second of a second cable is connected with a first aviation plug of the master unit control box, the other end of the second cable is connected with third aviation plugs of a plurality of slave unit control boxes, one ends of third cables are connected with 24-pin interfaces of the slave unit control boxes respectively, and the other ends of the third cables are connected with a plurality of devices to be monitored. The pulse-based multi-node gating monitoring system has the advantages that rotating speed and vibration parameters of a rotating machine can be measured effectively and precisely, the measuring precision for the rotating speed can reach to + / - 0.1Hz, and the measuring precision for the vibration parameters can reach to + / -1 micrometer; high anti-jamming capability is achieved, jamming can be resisted effectively by the aid of a metal shell, and the rotating speed and the vibration parameters can be measured accurately even in the severely-jammed site environment ; the pulse-based multi-node gating monitoring system is high in measuring response speed, instantaneity, economy and expansion capability.

The invention discloses a time response compensation method of a heat distributed gas mass flow meter. The time response compensation method includes: measuring a measured value increment at i moment on the basis of an original measured value; calculating a compensation of a steady state response value by adoption of a kalman filtering algorithm; recursion-calculating an average value of the steady state response values acquired by multiple original measured values before the i moment; eliminating an abnormal value from the acquired data queue; and using the average value of the previous moment and the next moment to replace the abnormal value, and rapidly responding to obtain a final measurement result. Without adding additional hardware, the method can greatly shorten the response time of the heat distributed gas mass flow meter; the experiment confirms that the response time can be shorted by 90%; the measurement response speed of the heat distributed gas mass flow meter can be effectively improved, and the dynamic measurement character of the heat distributed gas mass flow meter can be remarkably enhanced.

The invention discloses a fully-integrated infrared gas sensor and a working method thereof, which comprises a piezoelectric micropump layer, a porous layer, an optical cavity layer, a circuit layer, an infrared light source, an optical filter and an infrared sensing element, wherein the circuit layer is used for outputting a periodic voltage sequential control signal to the piezoelectric micropump layer so as to control the rising or pressing action of the piezoelectric micropump layer; when the piezoelectric micropump layer is pressed down and completely covers the pores in the porous layer, the circuit layer is also used for outputting a control signal to the infrared light source so that the infrared light source can emit infrared light; the optical filter is used for filtering infrared light of infrared characteristic absorption wave band of non-to-be-detected gas; the infrared sensing element is used for converting the infrared light, filtered by the optical filter and absorbed by to-be-detected gas, into an electrical signal, and the circuit layer is also used for calculating the converted electrical signal so as to obtain the concentration value of the to-be-detected gas. The invention further provides a working method of the infrared gas sensor.

The invention discloses a method for determine a common working area of an engine, which is used for obtaining the common working area of the engine quickly and accurately. The method includes the following steps: collecting the discharge capacity of nitrogen oxides and corrected parameters at different rotational speed and under different torque conditions of the engine during the rack testing of the engine; storing the corresponding relation between the rotational speed, the torque and the corrected parameters of the engine and the discharge capacity of nitrogen oxides of the engine; collecting the actual rotational speed, the actual discharge capacity of nitrogen oxides and the actual corrected parameters of the engine during the actual operation of a vehicle; then inquiring the corresponding relation between the rotational speed, the torque and the corrected parameters of the engine and the discharge capacity of nitrogen oxides of the engine to obtain the actual torque of the engine during the actual operation of the vehicle; and determining the common working area of the engine as per the actual rotational speed and the actual torque of the engine. The invention further discloses a system and a device for determining the common working area of the engine.

The present application provides a precision self-correction method and system for aircraft panel manufacturing. The precision self-correction method includes: arranging a visual measurement system according to the process information of the aircraft panel; during the workpiece manufacturing process, using the visual measurement system for real-time monitoring to acquire measurement data; and combining the acquired measurement data with the workpiece The theoretical data is compared to obtain the real-time error; according to the real-time error, the process parameters of the flexible tooling or manufacturing equipment are adjusted. The precision self-correction method uses the method of visual measurement of the depth of field data to monitor the deformation, the measurement range is large, and the measurement response is fast; the deformation data is fed back to the flexible tooling, and the flexibility of the flexible tooling is fully utilized to improve the rigidity of thin-walled parts and reduce machining vibration. , thereby correcting the manufacturing accuracy.

The invention discloses a nuclear-free metering automatic control system for balanced sugarcane feeding squeezing. With an optical wave measurement technology, the sugarcane feeding squeezing amount can be measured and controlled based on combination with the PLC and computer control technology. The system is composed of a laser ranging module, an electric control module, a PLC control module and a man-machine interface monitoring module and is based on a novel application technology using the optical wave measurement technology to replace a nuclear source so as to realize squeezing conveying metering. Compared with the nuclear source technology, the application cost is reduced, the operation becomes simple and convenient, nuclear leakage and loss can be avoided; management measures including nuclear supervision and nuclear waste recovery and the like can be effectively reduced, and the internal management of the enterprise can be optimized. The nuclear-free sugarcane feeding, squeezing, and conveying measurement technology having characteristics of high intelligent level, environment protection, and high efficiency can replace the nuclear source metering system that is employed by the sugar refinery currently comprehensively and thus has the broad market prospects.

A T-type ultra-fine thermocouple manufacturing process relates to the technical field of instrument processing, including main material selection, cutting treatment, welding and baking, glue sealing and curing, and testing and assembly. The beneficial effects of the present invention are: the present invention determines the use of reasonable processing equipment, supplemented by the selection of corresponding process parameters, to process ultra-fine thermocouples, the diameter of the prepared thermocouples can reach 0.4mm, and the prepared thermocouples have rapid measurement response , strong stability and performance, effectively solve the technical gap in the current technology, which cannot be processed by ultra-fine thermocouples, and is easy to promote and use.

The invention comprises a temperature control cavity mounted in the rapid determination meter. It features the following: said temperature control cavity uses the heated air to control the temperature in the control cavity. The invention also provides a BOD rapid determination meter comprising a case, and both microbial electrode and the temperature controller mounted in the case.