63results about How to "Influence of measurement accuracy" patented technology

The invention relates to a helical weld pipe line outer diameter measuring device and a helical weld pipe line outer diameter measuring method based on view detection. The helical weld pipe line outer diameter measuring device comprises an industrial camera 1, an industrial camera 2, a grid calibration target, a linear laser generator, a cantilever, a guide track, a lifting mechanism and a measuring platform, wherein the plane of laser generated from the linear laser generator is perpendicular to the horizontal plane; the industrial camera is fixed on the guide track through the lifting mechanism; a central light axis is perpendicular to the plane of the laser; the industrial camera 2 is used for vertically taking images of the edge of a steel pipe and the laser light from top to bottom through the cantilever; the grid calibration target is arranged inside the plane of the laser and perpendicular to the central optical axis of the industrial camera 1; the calibration of the industrial camera is firstly completed; when a helical weld pipe is produced, laser light images are simultaneously taken by the industrial camera 1 and the industrial camera 2, and the outer diameter and the ellipticity of the helical weld pipe can be calculated by processing the images. Due to the cooperation of the double industrial cameras, the guide track and the lifting mechanism, dynamic measurement on the outer diameter and the ellipticity of helical weld pipes of different diameters can be achieved.

The invention relates to a Hartmann wavefront sensor based on diffraction grating arrays. The sensor comprises an optical matching system, a first Fourier lens, a second Fourier lens, a charge coupled device (CCD) 1 detector, a CCD 2 detector, a spectroscope, a first diffraction grating array and a second diffraction grating array, wherein both the first diffraction grating array and the second diffraction grating array are formed by tightly arranging sub gratings with variable spatial frequency; the first diffraction grating array and the second diffraction grating array are respectively coupled with the first Fourier lens and the second Fourier lens which are attached to the front face or the back face to realize wavefront aperture cutting. The am of adjusting the measurement dynamic range of the Hartmann wavefront sensor under a high precision condition is fulfilled by selecting the diffraction series of a sub grating to control the dynamic range of each sub wavefront aperture focusing facula in the CCD detectors. The problem of irreconcilable conflict between measurement precision and dynamic range of the traditional Hartmann is solved through the Hartmann wavefront sensor; and the Hartmann wavefront sensor is simple in structure, stable in performance and high in adaptability, and is applied to fields, such as optical processing detection, detection on wavefront phase and beam quality of various high-power lasers, and the like.

The invention discloses a method for realizing high-precision distance measurement through measuring a phase difference. First of all, by use of a function relation between a phase shift and a frequency shift, an airborne distance measurement formula led out from a Doppler equation is converted to a method for positioning a fixed object by an airborne single station only on the basis of the difference measurement. Based on this, on one hand, based on a characteristic that an airborne difference distance measurement solution is irrelevant to the motion speed of a detection platform itself, and on the other hand, through comparing with an approximate expression, obtained through derivation based on a difference positioning equation, of a strict distance measurement solution, an airborne difference passive distance measurement method is further developed to a double-station positioning method which is not only restricted to motion states of the platform itself, but also can perform real-time detection on maneuvering objects. Since error measuring equation of the difference distance measurement solution is irrelevant to a huge-magnitude light velocity, compared to a time difference positioning technology, better positioning precision can be obtained through fewer sites by use of difference positioning. A result given by use of the method definitely explores a new research direction for the development of a positioning technology.

The invention discloses a self-bucket-tipping type irrigation water amount measuring device. The device comprises a water passing tank, a tipping bucket, a water inlet gate and a measuring system usedfor measuring the irrigation frequency of the tipping bucket; the tipping bucket is rotatably connected with the water passing tank, the water inlet side of the water passing tank is provided with afirst opening matched with the water inlet gate, the water outlet side of the water passing tank is provided with a second opening matched with the tipping bucket, the front end of the tipping bucketextends out of the second opening, and the water inlet gate is slidingly connected with the first opening; in the water inlet state, the water inlet gate is in a low position so that water in an irrigation channel can enter the tipping bucket, the tipping bucket is transversely distributed in the water passing tank, the center of gravity of the tipping bucket is gradually transferred towards the front end of the tipping bucket along with the increase of the water inlet amount, when the water level in the tipping bucket reaches a calibration value, the tipping bucket tips over clockwise under the action of the gravity of the tipping bucket, the water inlet gate is synchronously driven to ascend to separate the irrigation channel from the tipping bucket, and the water in the tipping bucket flows into farmland. According to the self-bucket-tipping type irrigation water amount measuring device, intermittent and equivalent water passing is achieved through a balanced bucket tipping mechanism, and the irrigation water amount in the farmland is accurately measured.

Provided is a transformer bushing insulation state on-line monitoring system. A PT signal conditioning module is connected to PT mutual inductors and a CT signal conditioning module is connected to CT mutual inductors. Three signal output channels of the PT signal conditioning module and three signal output channels of the CT signal conditioning module are connected to six signal input channels of an AD synchronous converter respectively. The signal output channels of the PT signal conditioning module are connected to a first signal input channel of a phase-locked loop module and a signal output channel of the phase-locked loop module is connected to a clock input channel. Data bus of the AD synchronous converter is connected to data bus of a master module and data bus of SRAM respectively, a channel control interface of the master module is connected to a channel control interface of the SRAM, and a signal output channel of the master module is connected to a second signal input channel of the phase-locked loop module. According to the invention, synchronous sampling of voltage and current is realized such that fundamental voltage measurement accuracy is not affected by frequency fluctuation of a grid system.

The invention discloses an electronic metering device for milking in constant volume and aims to provide an electronic metering device for milking in constant volume, which has high detection accuracy. The electronic metering device mainly comprises an upper shell, a metering cavity and a lower shell and also comprises a constant volume cavity, a valve body and a two-phase gas and liquid flow separating pipeline, wherein the constant volume cavity is arranged between the metering cavity and the lower shell, and the metering cavity and the constant volume cavity are firmly connected in series from top to bottom and are hermetically installed through the upper shell and the lower shell; the valve body is arranged between a circular passage for milk to flow and a circular passage for discharging milk; the two-phase gas and liquid flow separating pipeline passes through the metering cavity along the axial direction; the upper port of the two-phase gas and liquid flow separating pipeline extends out of the upper cone of the metering cavity and is communicated with the inner cavity of the upper shell; and the lower port of the two-phase gas and liquid flow separating pipeline is communicated with the constant volume cavity. The invention is suitable for dynamic volumetric metering of milking volume of mechanized milking stations.

The invention discloses a current sensing device. The current sensing device comprises a magnet field collecting ring, a current sensor unit and at least one current sensing device comprises a magnet field shielding assembly. The magnet field collecting ring is used for collecting a magnet field produced by a current-carrying wire penetrating through the magnet field collecting ring and is provided with a gap. The current sensor unit is formed in the gap and used for sensing the magnet field collected by the magnet field collecting ring. The magnet field shielding assembly is used for shielding the magnet field collecting ring and forming a gap together with the magnet field collecting ring and accordingly preventing an external magnet field from being collected by the magnet field collecting ring. The current sensing device can detect and measure weak current in high-accuracy mode and eliminate the influence of the external magnet field to measurement.

A magnetic liquid magnetic induction intensity sensor is suitable for magnetic induction intensity measurement. The sensor comprises a weak magnet (1), magnetic liquid (2), a magnetic field probe (3), a phase-shift light sensation displacement sensor (4), an analog-digital converter (5) and a display (6). In an initial state, the magnetic liquid (2) is located in the center of the bottom of the magnetic field probe (3) under the action of the weak magnet (1); after a magnetic field is applied, a peak is generated on the surface of the magnetic liquid (2), the larger the magnetic field intensity is, the higher the peak of the magnetic liquid (2) is, and the smaller the distance between the top of the peak of the magnetic liquid (2) and the light source of the phase-shift light sensation displacement sensor (4) is, so that the larger the output voltage signal is. In a certain range, a good linear relation exists between the input magnetic liquid (2) and the output voltage signal, and the requirements of engineering application can be met. The requirements for working conditions of the magnetic liquid magnetic induction intensity sensor is lower than that of a traditional sensor, the impact resistance and the vibration resistance are achieved, and the application range is wide.

An absolute position fiber optic encoder readhead having multiple readhead portions for sensing the displacement of respective scale grating tracks of a scale is disclosed. The detector channels of the readhead portions are fiber optic detector channels having respective phase grating masks. The fiber optic encoder readhead portions are configured to detect the displacement of a self-image of a respective scale grating track of the scale. In various exemplary embodiments, the fiber optic readhead portions are constructed according to various design relationships that provide a relatively high signal-to-noise ratio. Accordingly, high levels of displacement signal interpolation may be achieved, allowing submicrometer displacement measurements. The fiber optic encoder readhead portions may be assembled in a particularly accurate and economical manner and may be provided in a package with dimensions on the order of 1-2 millimeters, resulting in a very small overall absolute readhead dimension that is dependent on the number of readhead portions that are incorporated. Optical fiber receiver channels carrying binary optical signals derived from a scale code track may be provided in the readhead, to provide an extended absolute measurement range.

The present invention discloses a non-phase-sensitive digital demodulation system and method applied to an LVDT displacement sensor. The system comprises a pre-processing circuit for carrying out signal conditioning and analog-to-digital conversion processing on the original signal outputted by a secondary coil and obtaining a corresponding pre-processing signal, a signal filtering circuit for filtering the noise signal and / or high-frequency component in the pre-processing signal and correspondingly obtaining the DC component comprising displacement information, and an information processor for mapping the DC component by using a preset mapping database and obtaining the iron core displacement information corresponding to the DC component. The non-phase-sensitive digital demodulation system disclosed in the invention does not have any association with a phase in the process of signal demodulation processing, thus the influence on measurement precision of an iron core displacement amount by phase jitter is eliminated, and the measurement precision of the iron core displacement amount is improved.

The invention provides a wind speed measuring device, an air valve and an air volume adjusting system. The wind speed measuring device communicated with an air duct can be used for measuring the windspeed in the circular ventilation section with the diameter D in the air duct, the wind speed measuring device includes at least one anemometer, the anemometer is an impeller anemometer, and a rotating surface of an impeller of the impeller anemometer can be disposed perpendicular to the central axis of the circular ventilation section. The wind speed measuring device is advantaged in that the impeller anemometer is utilized to measure the wind speed in the air duct, the average wind speed through the rotating surface of the impeller is measured, the effect of the vortex flow can be avoided, relatively large fluctuation in the short time period can be avoided, compared with a point measurement method in the prior art, the wind speed measuring device has strong anti-wave, anti-corrosion andanti-interference abilities and higher measurement accuracy.

The invention discloses a special low-cost dissolved oxygen sensor for aquaculture. The special low-cost dissolved oxygen sensor comprises an outlet cable, a sensor main body, a sensor electrode core, a millstone, a push rod motor, a protection cover and a connection piece, wherein the sensor main body comprises an analog-digital conversion circuit, a signal amplification circuit, a filter circuit and a microcontroller module which are connected with one another in sequence; the sensor electrode core comprises an anode and a cathode; and the sensor main body also comprises a clock module, an input setting module and a data storage module. The work period of the push rod motor can be preset, the service life of the sensor electrode core is prolonged, data is stored by the data storage module in real time, and thus data loss caused by sensor failure is avoided. The surface of the sensor electrode core can be cleaned automatically, the measurement precision is high, and the measurement precision is not influenced by water pollution and water flow speed. According to the specific implementation manner, the dissolved oxygen sensor has the advantages of simple structure, reasonable arrangement, low manufacture cost, and the like.

The invention relates to a hoisting device of a force speed measuring sensor of a drum winch, and belongs to the measurement technology field of dragging winches. The hoisting device of the force speed measuring sensor of the drum winch comprises a hoisting frame of the force speed measuring sensor and is characterized in that: the hoisting device is composed of the hoisting frame, the force speed measuring sensor and a hoisting slideway; the hoisting frame is composed of a hanging frame and a sliding frame, the hanging frame is assembled on the sliding frame for hoisting and installing the force speed measuring sensor, and the sliding frame is assembled on the hoisting slideway and can be moved along the hoisting slideway. The hoisting device and the drum winch are integratedly installed, thereby realizing the integration of the measurement of the winch without the need of installing the sensor repeatedly at each time of construction; the measurement precision is not affected by the change of construction sites, and the rope stretching speed of a drum steel wire rope and the received tension value thereof can be measured conveniently and accurately.

The invention belongs to the technical field of aviation, and relates to a system for supplying oil to an engine and hydraulically cooling during the engine test. According to the system, fuel is supplied to the tested engine according to the pressure, flow rate and temperature of the engine as requirement, and the fuel absorbing the heat of a hydraulic loading system is timely combined with the returned hot fuel of the engine and then returned to a fuel tank of an airplane together; the measuring precision of the fuel supplied to the engine cannot be influenced by the temperature.

The invention relates to the technical field of snow melting and snow removing, in particular to a heating plate and a snow removing device for railway infrared journal temperature detection equipment. The heating plate comprises a thermal insulation mother plate and an electric heating wire. The thermal insulation mother plate comprises a first side face and a second side face opposite to the first side face. The first side face is provided with a groove, and the electric heating wire is located in the groove. The fallen accumulated snow is molten through the electric heating wire on the thermal insulation mother plate, efficiency of removing the snow on outdoor equipment can be greatly improved, and railway train operation safety risks caused when the railway infrared journal temperature detection equipment cannot carry out normal detection or the outdoor equipment cannot normally work due to snow blockage are fundamentally and completely eradicated. In addition, the thermal insulation mother plate can block thermal radiation of the electric heating wire, thermal radiation of the electric heating wire is prevented from affecting the measurement precision of the railway infrared journal temperature detection equipment, and therefore snow is removed on the condition that the railway infrared journal temperature detection equipment does not stop working.

The invention discloses an optical fiber conduction type rotor flow sensor. The optical fiber conduction type rotor flow sensor comprises a circuit system, a parallel light source, a glass rotor flow meter, optical fiber coherent fiber bundles and a photosensitive diode array, wherein the optical fiber coherent fiber bundles are arrayed into an ordered vertical row in the axis direction of a glass tube and is contacted with the outer wall of the glass tube; the parallel light source and the optical fiber coherent fiber bundle array are located on the two sides of the glass tube; an optical fiber coherent fiber bundle array is located on the opposite side of the parallel light source; the length of the parallel light source is the same as that of the optical fiber coherent fiber bundle array; the optical fiber coherent fiber bundle array is composed of a vertical row of optical fibers; the row of the optical fibers is divided into m / 2 groups; the arraying length of each group of the optical fibers is two times as much as the length of a floater; each group of the optical fibers is composed of n optical fibers and n is a positive integer; correspondingly, the photosensitive diode array is composed of n photosensitive diodes. The sensor disclosed by the invention has the following characteristics that a digital signal is output, the anti-jamming capability is strong, the resolution ratio is high, the performance is stable and reliable, the structure is simple and the cost is low.

The invention discloses a mechanical-sensor electronic water meter. The mechanical-sensor electronic water meter is composed of a mechanical base meter and a circuit box receiving magnetic field signals and carrying out computer processing. The base meter is composed of a machine core generating water flow signals and a shell sealing a water channel; the circuit box is divided into an upper portion and a lower portion, wherein the lower portion is a magnetic tunnel effect sensor protected by an antimagnetic cover, the upper portion is a main circuit board provided with a lithium battery, and a liquid crystal display is arranged at the top of the main circuit board. The mechanical-sensor electronic water meter has the advantages that the built-in battery of the meter is not replaced, and the meter can normally work more than ten years or above; infringement of the wet working environment is avoided; meanwhile, the mechanical-sensor electronic water meter has the functions of resisting magnetic interference, resisting unlawful disassembling, resisting dust pollution and the like; it is guaranteed that the measuring accuracy of the water meter is not influenced by water pressure changes; as an impeller is designed, sensitive wear resistance is guaranteed; the proportion is close to the density of water, and the mechanical-sensor electronic water meter moves along with the rule of water flow; the antimagnetic structure is not interfered through an external high magnetic field, and can guide an internal magnetic field to do not generate adsorption effect on rust in water.

The invention relates to intelligent city surveying and mapping equipment based on the Internet of Things. The intelligent city surveying and mapping equipment comprises a chassis, a working box, a rotating wheel and two driving wheels. The working box is provided with a groove, a lifting mechanism, a three-dimensional laser scanner and a protection mechanism, a moving mechanism comprises a driveunit, an adjustment unit and two brake units, each brake unit comprises a brake box, a clamping assembly, a brake pad and two rotation rods, and the protection mechanism comprises a second motor, a third gear and two rotation units. According to the intelligent city surveying and mapping equipment based on the Internet of Things, there is no need to dismantle many times by means of the moving mechanism when the city surveying and mapping equipment is used for measuring a larger area, so that the time of surveying and mapping is reduced, and the cost of surveying and mapping is reduced; the city surveying and mapping equipment is provided with the protection mechanism, so that a measuring device is retracted back to the inside of the equipment when measuring, surveying and mapping work is not conducted to avoid the accumulation of a large amount of dust on the surface of the measuring device and avoid influences of dust shielding on the measurement accuracy of the city surveying and mapping equipment.

The invention discloses a pressure sensor protection device. The pressure sensor protection device comprises a shell body and a cover plate fixedly connected to an opening of the shell body. The shell body is of a hollow cylindrical structure and used for containing a pressure sensor. The invention further discloses an assembly method of the pressure sensor protection device. Due to the interval between the pressure sensor and the shell body and the interval between the pressure sensor and an axial translational motion plate, influences on the measurement precision of the sensor caused by long-term or instantaneous mechanical disturbance are avoided, and influences on the pressure sensor caused by external temperature changes are delayed. The pressure sensor protection device overcomes the defect that an existing pressure sensor is prone to external mechanical disturbance and can be used in measurement work of air pressure and liquid pressure in complex load environments.

The invention discloses a Hartmann sensor relay lens with a multiplying power fine-adjustment mechanism, and belongs to the field of photoelectric detection and adaptive optics. In order to overcome the shortcoming that the multiplying power in the traditional Hartmann sensor relay lens is fixed, a front component, a rear component and an adjusting component are arranged in a relay lens barrel; a front component lens is fixed by a pressure ring; a rear component lens is arranged in a rear component seat and is fixed by a rear component pressure ring; an adjusting component lens is arranged on an adjusting component seat and is fixed by an adjusting component pressure ring; the adjusting component lens can move in the front-back direction by shifting an adjusting component shifting column, so that fine adjustment on the multiplying power of the relay lens is realized; after the relay lens is adjusted to an accurate position, an adjusting component set screw is screwed down to fix the adjusting component; the front component is a combination of a negative lens and a positive lens which are adhered to each other; the focal power of the front component is positive; the negative lens is a meniscus lens; the positive lens is a double-convex-shaped lens; the rear component is a combination of a positive lens and a negative lens which are adhered to each other; the focal power of the rear component is positive; the positive lens is a double-convex-shaped lens; the negative lens is a meniscus lens; and the multiplying power adjusting component is a meniscus lens with positive focal power.

The invention provides a reversing valve unit action characteristic detection method and device. The reversing valve unit action characteristic detection method includes the following steps: (1) a driving signal for driving a driving coil of a reversing valve to act is emitted to the driving coil of the reversing valve, the time of emitting the driving signal is recorded, and data of changing of the current of the coil along with the time are measured; (2) the displacement and load of a valve element are measured to obtain data of change of the displacement and load of the valve element relative to the time; and (3) according to the measured data, the action characteristic of the reversing valve is analyzed. The motion characteristic of the valve element is obtained by detecting the displacement of the valve element, the current change of the coil and the load of the valve element, the measured motion characteristic is analyzed to obtain the fault situations of all components of the reversing valve, the reversing valve is maintained in a targeted mode, and the problem of low maintenance efficiency of a reversing valve in the prior art is solved.

The invention discloses a liquid sampling, metering and detecting device which comprises a metering cylinder and a main piston rod arranged in the metering cylinder, a first cover body is arranged atthe top end of the main piston rod, an inner cylinder is coaxially arranged in the metering cylinder, and a groove is formed in the bottom of the piston rod in the axial direction. The upper portion of the inner cylinder is arranged in the groove, an auxiliary piston rod is arranged in the inner cylinder, the auxiliary piston rod sequentially penetrates through the inner cylinder, the main pistonrod and the first cover body, and the top end of the auxiliary piston rod is connected with a second cover body. The device is simple and practical in structure, the inner cylinder is additionally arranged in the metering cylinder, meanwhile, the main piston rod is matched with the auxiliary piston rod, the liquid taking range can be accurate to one digit after a decimal point, the first meteringguide rail and the second metering guide rail are matched, and high stability can be kept in the using process; due to the arrangement of the limiting block, errors existing in operation can be eliminated, the measuring precision cannot be affected by manual operation, and the accuracy of detection and analysis is improved.

The invention relates to the field of slewing bearing detection, in particular to a slewing bearing raceway contour detection device. The slewing bearing raceway contour detection device comprises a rack and a self-centering chuck, the rack forms a supporting platform, the self-centering chuck is installed on the supporting platform, and an inner ring or an outer ring of a to-be-detected slewing bearing (hereinafter referred to as a to-be-detected workpiece) can be placed on the self-centering chuck. The self-centering chuck is provided with a plurality of clamping jaws, the clamping jaws arecircumferentially and evenly distributed at intervals, the clamping jaws can move forwards and backwards in the radial direction of the self-centering chuck, and when the slewing bearing is fixed, theclamping jaws can abut against the inner wall or the outer wall of the to-be-detected workpiece at the same time, so that the to-be-detected workpiece is fixed. Therefore, when the raceway of the to-be-measured workpiece is detected, the to-be-measured workpiece can be fixed through the self-centering chuck, and it is guaranteed that the slewing bearing does not shake in the measurement process to influence the measurement precision of the raceway.

The invention relates to a comprehensive once current-limiting and voltage-limiting resonance eliminator which is used for eliminating ferroresonance caused by an electromagnetic transformer in 6-35kv neutral ungrounding alternating-current power system. The comprehensive once current-limiting and voltage-limiting resonance eliminator comprises a base, a lower electrode, an upper electrode and an insulation sleeve. A nonlinear current-limiting and voltage-limiting component is arranged in an inner cavity of the insulation sleeve and composed of a PTC (pitch trim compensator) and a VDR (voltage dependent resistor). Quartz sand is arranged between the nonlinear current-limiting and voltage-limiting component as a filling heat radiation layer, and a current sensor is arranged in the base. The comprehensive once current-limiting and voltage-limiting resonance eliminator can effectively suppress resonance overvoltage of various frequencies and overcurrent of the voltage transformer and avoid burning of the voltage transformer and a high-voltage fuse, is high in heat radiation speed and thermal capacity, and meets the protection requirements for long lines and high load. By the aid of a full-sealing structure, the comprehensive once current-limiting and voltage-limiting resonance eliminator is stable in performance, convenient to monitor, and wider in application range.

The invention relates to the technical field of electrical measurement and more particularly to a three-phase four-wire electric energy metering device having a null line missing detection function. The three-phase four-wire electric energy metering device comprises a three-phase four-wire energy metering processing circuit, a null line current sensor, a null line missing signal processing circuit, and a three-phase four-wire power supply circuit. The three-phase four-wire electric energy metering processing circuit samples a three-phase input voltage signal and a three-phase input current signal and calculates a grid parameter. The null line missing signal processing circuit samples the output signal of the null line current sensor and calculates the null line current of the three-phase four-wire power supply circuit. When the null line current of the three-phase four-wire power supply circuit is smaller than a set null line missing current threshold value, the null line missing signal processing circuit outputs a null line missing signal. Compared with the prior art, the three-phase four-wire electric energy metering device eliminates an influence of the installation of an null line current transformer on the measurement accuracy of the grid parameter of the three-phase four-wire energy metering device.

The invention discloses a low-cost dissolved oxygen sensor, which comprises an outlet cable, an outlet cable protective cover, a sensor body, a sensor electrode core, a grindstone, a push rod motor, a protective cover, and a connecting piece. One end of the sensor body is connected to the outlet cable The other end of the sensor body is connected to the sensor electrode core. The sensor body also includes a clock module, an input setting module and a data storage module, which can pre-set the working cycle of the push rod motor and extend the sensor electrode core. service life, and real-time storage through the data storage module to avoid data loss caused by sensor failure. The surface of the sensor electrode core of the present invention can be cleaned automatically, and the measurement accuracy is high, and the measurement accuracy is not affected by water pollution and water flow speed. This specific embodiment The utility model has the advantages of simple structure, reasonable setting, low production cost and the like.

The invention discloses a fault diagnosis system for an optical fiber current sensor. The fault diagnosis system comprises a photoelectric detector, a signal conditioning module, an adder circuit module, an AD sampling module and a data processing module. The invention further discloses a fault diagnosis method for the optical fiber current sensor. The system can be used for detecting whether thewhole optical path system of the optical fiber current sensor fails or not; the fault detection system is established on the basis of an optical fiber current sensor measurement system without extra circuit components and systems and extra optical path loss, so that the measurement precision and the like of the optical fiber current sensor are not affected, and effective detection of optical fibercurrent sensor faults can be completed under the conditions of low cost and easy implementation.

The invention provides a pressure sensor, which comprises a first support and an electrode piece, and is characterized in that the first support is provided with a supporting part used for supporting the electrode piece, and a plurality of adjusting pieces are sequentially superposed between two opposite surfaces of the electrode piece and the supporting part; the thermal expansion coefficients of the electrode piece, the multiple adjusting pieces and the first support are gradually increased one by one in the direction from the electrode piece to the supporting part. According to the pressure sensor provided by the invention, the problem of relative displacement between parts caused by temperature change can be solved.

The invention discloses an accumulated pulse profile time delay measurement method by sparse representation, and aims to mainly solve the problem that the sampling frequency and signal to noise ratio of pulse profiles can affect measurement accuracy in the prior art. The method is realized by the steps of: (1) conducting standard pulse profile sampling, and constructing a waveform matching redundant dictionary; (2) employing a greedy optimization algorithm to calculate a first-order sparse coefficient vector of the measurement pulse profile under the waveform matching redundant dictionary; and (3) according to the column corresponding to the only nonzero element in the first-order sparse coefficient vector, calculating the accumulated pulse profile time delay. Compared with the prior art, the method provided in the invention significantly reduces computation, improves the measurement precision of time delay, shortens the pulse profile accumulation time, and can be used for measurement of the time difference of arrival (TDOA) of the pulse from a spacecraft to a solar system barycenter.

The invention provides an optical electric field sensor packaging device and packaging method for a high-humidity environment. The packaging device comprises two optical fiber flanges, a tube shell body and a tube shell cover. The tube shell body is provided with an accommodating cavity for accommodating a sensor wafer. The tube shell cover is used for covering the tube shell body. Two opposite side walls of the tube shell body are respectively provided with through holes matched with the two optical fiber flanges. The optical fiber flanges, the tube shell body and the tube shell cover are all made of a material which is weak in water absorption and water permeability. The optical electric field sensor packaging structure is improved, a tube shell sealing sensor is made of a material with weak water absorption and water permeability, and hydrophobic treatment is carried out on the outer layer, so that the measurement precision of the sensor is basically not influenced by environmental humidity, and the application scene of the optical electric field sensor is widened.