63results about How to "Achieving self-compensation" patented technology

The invention relates to a pressure sensor chip based on silicon direction bonding and silicon on insulator and a manufacturing method thereof, and belongs to the field of sensor chips. The invention is characterized in that a shallow slot and a gas port on a supporting silicon wafer are formed through anisotropy corrosion, and appropriate shallow slot depth obtained by controlling the corrosion time can realize over pressure protection of parts. A silicon direct bonding technology bonds the supporting wafer and a reversed SOI wafer, realizes a beam-membrane structure on the SOI after lapping and polishing to improve the sensitivity and linearity of the parts; manufactures force sensing resistance elements on the processed beam; adopts the oxidation buried layer of the SOI to solve insulation and isolation of the sensing elements and elastic elements; and improves the long-termed reliability and adaptability under high temperature of the parts. The SOP high-sensitivity pressure sensor chip based on the bonding technology has the advantages of controllable process, excellent repeatability and high finished product rate.

The invention provides a BGO (Bismuth Germanium Oxide) crystal electro-optic coefficient temperature relevancy self-compensation device and method. The BGO crystal electro-optic coefficient temperature relevancy self-compensation device comprises a faraday collimation optical rotation device, a quartz tube, an antireflection film, a reflective film, a BGO crystal and a base; the faraday collimation optical rotation device comprises a collimating lens and a faraday optical rotation device; the collimating lens and the faraday optical rotation device are packaged inside the quartz tube; an antireflection film and a reflective film plate two ends of the BGO crystal; the quartz tube and the BGO crystal are installed on the base. According to the BGO crystal electro-optic coefficient temperature relevancy self-compensation device and method, faraday optical rotation device optical rotation angle temperature characteristics and influences thereof to an optical voltage transformer transformation ratio are utilized to automatically compensate BGO crystal electro-optic coefficient measuring error caused by temperature variation on line.

The invention discloses an on-line detection method and an apparatus of methane concentration. The method is characterized in that to-be-detected gas is enabled to freely diffuse to a static speed tube communicating to a measuring tube when the to-be-detected gas flows through the measuring tube, wherein the static speed tube is provided with ultrasonic transducers emitting ultrasonic to the static speed tube and receiving ultrasonic; sonic path distance of the ultrasonic propagating in the static speed tube can be obtained according to the arrangement of the ultrasonic transducers on the static speed tube; the ultrasonic transducers of the static speed tube emit and receive the ultrasonic to obtain an actual propagating time of the ultrasonic in the sonic path distance; an ultrasonic propagation speed Cf can be obtained through dividing the actual propagating time of the ultrasonic in the sonic path distance by the sonic path distance; and the methane concentration p of the to-be-detected gas can be obtained by substituting Cf into a formula for calculating the methane concentration, wherein t is current temperature of the to-be-detected gas in the measuring tube, Cair is an ultrasonic propagation speed in the air at a temperature of t. The static speed tube used in the on-line detection method provided by the invention is simple in structure, can be directly applied in coal mine and other measuring places, and realizes on-line detection of the methane concentration.

The invention discloses a wind speed sensing device based on fiber bragg gratings, and a wind direction monitoring system. The device comprises a wind energy transmission mechanism, a constant strength cantilever beam, and a packaging housing. The wind energy transmission mechanism consists of a windward pressed plate and a connecting rod, wherein the connecting rod is perpendicular to the windward pressed plate. One end of the windward pressed plate is fixed at the center of the connecting rod, and the other end of the windward pressed plate is fixed at the top of the constant strength cantilever beam. The top of the packaging housing is provided with an opening, and a cantilever beam installation pedestal is fixed at the bottom of the interior of the packaging housing. The constant strength cantilever beam stretches into the opening at the top of the packaging housing, and is detachably fixed on the cantilever beam installation pedestal. The surface of the windward pressed plate is parallel to the surface of the constant strength cantilever beam. The axes of the front and back surface of the constant strength cantilever beam are respectively provided with one fiber bragg grating. The system comprises two wind speed sensing devices which are arranged in an orthogonal manner, and the measured data is transmitted to a remote terminal. The device is compact in structure, is small in size, and is resistant to electromagnetic interference.

The invention discloses an air refractive index compensation method for a laser tracking measurement system based on dual-wavelength interference. The method comprises the steps: employing two light sources; enabling a laser to output two light beams with different wavelengths, and enabling the two light beams to pass through a polarization analyzer and to be split by the same light splitter, wherein one part serves as measurement light and is emitted to a system tracking measurement part light path formed by the light splitter, a polarization light splitter, a cat eye, a standard ball and a displacement detector, and the other part serves as reference light, and is reflected by a reflector to form respective interference signals at the light splitter. The method combines a method for compensating for an air refractive index through dual-wavelength interference with a laser tracking measurement system, introduces a dispersion coefficient A for determining a to-be-measured distance L during distance calculation, avoids the measurement inconvenience of the air refractive index on a laser transmission full path, and achieves the self-compensating of the air refractive index in a measurement process.

The invention provides a method for discriminating a neutral gear on the basis of an electromagnetic neutral gear sensor. The method includes storing a plurality of self-learning neutral gear duty cycle values in a memory, reading the self-learning neutral gear duty cycle values after a vehicle is powered on, solving a median value or an average value of the self-learning neutral gear duty cycle values, then using a complementary value of the median value or the average value as a base point of a neutral gear duty cycle discriminating range, judging whether duty cycle values of currently outputted first PWM (pulse width modulation) waves are in a range with the base point as the center or not, and determining that the vehicle is in the neutral gear if the duty cycle values of the first PWM waves are within the range; performing self-learning on the neutral gear duty cycle values, and storing duty cycle values of second PWM waves which are currently outputted by the electromagnetic neutral gear sensor so that the duty cycle values of the second PWM waves can be used when the vehicle is powered on for the next time. The method has the advantages that the base point of the range for discriminating the neutral gear duty cycle values can be acquired by a software algorithm, so that self-learning, self-correcting and self-compensating can be performed on a neutral gear duty cycle, the neutral gear discriminating accuracy and instantaneity can be improved, and the adaptability to different types of vehicles can be improved.

The invention belongs to the technical field of construction engineering, and relates to a fiber grating displacement meter in a fiber grating series mode. A first cushion block and a second cushion block are respectively mounted at two ends of a first spring, one end of the first spring is fixed on an equal-strength beam, the other end of the first spring is connected with a first feeler lever, a first fiber grating and a second fiber grating are respectively stuck to the front and back of the equal-strength beam, and a third cushion block is fixedly mounted below the equal-strength beam; a third fiber grating and a fourth fiber grating are stuck to the front and back of a cantilever beam, a fifth cushion block and a fourth cushion block are mounted at the upper and lower ends of a second spring, one end of the second spring is fixed on the cantilever beam, the other end of the second spring is connected with a second feeler lever, and the second feeler lever is vertically mounted in the horizontal direction of a displacement meter fixing device. The fiber grating displacement meter is simple in structure, convenient to operate, scientific in principle and low in manufacturing and maintenance cost, and is suitable for simultaneously measuring horizontal displacement and vertical displacement of a point to be measured in various weathers.

The invention belongs to the technical field of sensors, and relates to a linear accelerometer with zero self compensation. The accelerometer comprises a capacitor fixed plate, a capacitor movable plate, a capacitor detection pole plate, two capacitor pick-up circuits, a compensating circuit, a correction drive circuit, a torque, a fixed column and a housing. On the basis of unchanging the traditional accelerometer principle, the capacitor detection pole plate and the compensation circuit are additionally provided, so that the change of accelerometer zero position size, caused by time lapse or temperature change, can be automatically compensated. The linear accelerometer has the advantages of simple principle, convenience for implementation, low cost and high reliability, and can meet thedemands of systems such as inertial navigation, inertial guidance and the like on accelerometer zero position size and zero position long-term stability performance.

The invention discloses a direct liquid-cooled matrix distributed gain laser based on polarized multi-pass side pump, related to the technical field of high-energy laser. Gain units (I1, I2) comprisedirect liquid-cooled matrix distributed gain modules (7, 17); a first pump module and a 1 / 2 wave plate are arranged on one side of the gain module, and a second pump module is arranged on the other side; the first pump module comprises a first diode laser matrix pump source, a first fast-axis shaping mirror, a first slow-axis shaping mirror, a first reflecting mirror and a first polarizing beam splitter successively; and the second pump module comprises a second diode laser matrix pump source, a second fast-axis shaping mirror, a second slow-axis shaping mirror, a second reflecting mirror, anda second polarizing beam splitter successively. Compared with the prior art, the invention has the advantages such as high output power, excellent thermal management mode, good output laser beam quality and the like, and has an important application prospect in the field of high-power lasers.

The invention relates to a temperature self-compensation FBG (Fiber Bragg Grating) refractive index sensor based on conical corrosion. In the invention, a broadband light source is directly connected with a first port of a 3dB coupler through light, a second port of the 3dB coupler is connected with a conical-corrosion FBG, and a third port of the 3dB coupler is connected to a spectrograph. The invention has the advantages that the problem of cross sensitivity among physical parameters in a refractive-index measurement sensing technology can be effectively solved to realize sensing measurement of the refractive index by means of temperature self-compensation, and the sensor has a compact structure, further improved measurement precision and stronger antijamming capability to optical fiber vibration and the like. Meanwhile, an additional FBG does not need to be cascaded, so that the cost of the sensor is greatly reduced and the sensing measurement for multipoint distribution is easy.

The invention discloses a spoke type fiber bragg grating fatigue sensor with a temperature self-compensation function. The sensor comprises an elastomer and a fiber bragg grating, wherein the elastomer consists of a rim, a hub and spokes, wherein the rim is concentrically sheathed to the outer side of the hub; the rim and the hub are fixedly connected through four spokes which are evenly distributed; peripheral screw through holes are evenly distributed on the rim; the center of a circle of the hub is provided with a central thread through hole; the fiber bragg grating comprises a No. 1 grating, a No. 2 grating and a No. 3 grating, wherein the three gratings are connected in series in one fiber; four spokes are arranged in sequence according to mark numbers; a phase angle of 180 degrees isformed between the No. 1 and No. 3 spokes; a phase angle of 180 degrees is formed between the No. 2 and No. 4 spokes; the No. 1 grating is pasted to the front side surface of the No.1 spoke; the No.2 grating is pasted to the rear side surface of the No.3 spoke; the No. 3 grating is pasted to the middle of the upper surface of the No.2 or No.4 spoke; the pasting direction of the No. 1 grating andthe pasting direction of the No.2 grating are the same, are both in a tensile strain direction and form an angle of 45 degrees with a neutral surface; and the pasting direction of the No. 3 grating is vertical to the length direction of the No. 2 or No. 4 spoke, and the pasting thickness is greater than 1mm.

A temperature self-compensation fiber grating large-strain sensor comprises bases, two capillary steel pipes, two fiber gratings, two vertical support plates and a horizontal support plate. The bases are respectively in a rectangular plate body structure, and are connected with the vertical support plates on the top surfaces of the bases through rotation connection shafts respectively; the two capillary steel pipes are fixedly arranged between the two vertical support plates in an up-and-down parallel manner; the two capillary steel pipes are in horizontally parallel state and are vertically and fixedly connected with the vertical support plates; the horizontal support plate is arranged between the two capillary steel pipes; the horizontal support plate is in horizontal state and the two ends of the horizontal support plate are movably connected with the two vertical support plates through the rotation connection shafts; the fiber gratings are packaged rigidly in the capillary steel pipes respectively after applying prestress; the bases and the horizontal support plate are parallel; and the bases are provided with screw holes. According to the temperature self-compensation fiber grating large-strain sensor, the problem of temperature and strain cross sensitivity can be solved, measuring sensitivity can be changed, and large-strain measurement of a test piece to be tested can be realized.

The invention discloses a fiber grating inclination sensor of temperature self-compensation type. The inclination sensor comprises a packing box. A cantilever rod with a fixed end is arranged in the box. A free end of the cantilever rod is fixed with a heavy mass block. Four sides of the fixed end of the cantilever rod are respectively provided with a fiber grating strain sensor. The mass block is provided with a temperature compensation sensor. When the packing box inclines together with the cantilever rod, the fiber grating strain sensor on the cantilever rod can monitor the strain change so as to measure the inclination angle. The temperature compensation sensor can eliminate the influence of temperature on the inclination sensor, and the self-compensation of the inclination sensor can be realized by quasi-distribution. The inclination sensor has simple process and low cost and is suitable for industrial production. The arrangement is convenient, as the inclination sensor can be directly arranged inside or outside a tested structure so as to facilitate the operation and realize high accuracy. In addition, one signal collecting and analyzing device can be used for recording the data of a plurality of inclination sensors.

The invention discloses a preparation method of planeness-self-compensating multi-tip array for large area micromachining, comprising the following steps: plating a layer of wax sheet film (3) on a glass slide (4), and forming uniformly arranged grooves (2) on the wax sheet film (3); adding microspheres (6) into each groove (2) one by one, further pressing the microspheres (6) into the wax sheet film through a slide (7) to make all the microspheres (6) contact the glass slide (4); adhering an elastic material sheet (10) on a flat tip plate (8), and further applying a layer of UV gel (11); flat pressing the UV gel of the tip plate (8) on the microspheres (6), simultaneously carrying out ultraviolet radiation on the UV gel, thereby solidifying the UV gel, and adhering the microspheres (6) on the tip plate (8); and finally, melting the wax sheet film, taking the glass slide (4) away, washing away the residual wax on the surface of the microspheres (6), thereby obtaining the multi-tip array. With the method provided by the invention, the obtained mutli-tip array has good planeness, and height of each tip is consistent; and preparation of the multi-tip array is simple, low-cost and easy to carry out.

The invention discloses a device capable of achieving turbulence profile laser radar image surface temperature drift compensation. The device comprises a telescope system. The telescope system comprises a front end main lens cone and a rear end support and is characterized in that a temperature drift compensation device is arranged at the rear end of the main lens cone, the temperature drift compensation device is located in front of a focal plane of the telescope imaging system, a receiving detection device is arranged on the support and located on the focal plane of the telescope imaging system, the temperature drift compensation device comprises a lens cone capable of being adjusted in a sliding mode, in the main shaft direction of the telescope system, one end of the lens cone capable of being adjusted in the sliding mode is provided with a positive lens, the other end of the lens cone capable of being adjusted in the sliding mode is provided with a negative lens, and the positive lens and the negative lens are opposite to each other at the interval of 50 mm. After the self compensation device is inserted into an original measuring system, the focal distance and other optical parameters of the original system are not changed, and the inherent spherical aberration of the system can be corrected; meanwhile, self compensation of image surface temperature drift can be achieved by electrically controlling fine adjustment of the temperature drift compensation device.

The invention provides a wide-viewing angle wave plate comprising two liquid crystal boxes, wherein each liquid crystal box comprises a first side, a second side, and bi-refringence liquid crystal material between the two sides; the first side and the second side are opposite to each other; the two liquid crystal boxes are configured in such a manner that the first sides or the second sides are jointed; the preset tilt angle, near the first side, of the liquid crystal molecules of the bi-refringence liquid crystal material in each liquid crystal box is 0 to 20 degrees; the preset tilt angle, near the second side, of the liquid crystal molecules of the bi-refringence liquid crystal material in the liquid crystal box is 70 to 90 degrees; the liquid crystal molecules of the bi-refringence liquid crystal material between the first side and the second side are naturally extended or curled. The wide-viewing angle wave plate has the advantages that the manufacture process is simpler, the production cost is lower, and the phase difference generated by the wave plate cannot change with visual angles any more.

The invention provides an astigmatism self-compensation solid laser, which comprises a pump source, a resonant cavity and a gain medium, wherein the gain medium has thermal lens astigmatism; the resonant cavity is an astigmatic cavity; and the gain medium is arranged in the resonant cavity in a way that the direction, with relatively poorer thermal effects, of the gain medium is in the meridian plane of the resonant cavity and the direction with relatively better thermal effects is in the sagittal plane of the resonant cavity. The solid laser can be obtained by compensating the astigmatism of the resonant cavity and the thermal lens astigmatism without inserting an additional astigmatism compensation element, and is high in output power, conversion efficiency, beam quality and stability, simple, convenient and reliable.

The invention discloses a method and a device for detecting ultrasonic flow by the time-difference method. The method includes: enabling to-be-tested gases to be freely spread into a static speed pipe when the to-be-tested gases flow through a pipe section of a measuring pipe provided with an ultrasonic transducer group, the static speed pipe is provided with ultrasonic transducers used for emitting and receiving ultrasonic waves into the static speed pipe, sonic path distance of the ultrasonic waves spreading in the static speed pipe can be obtained according to arrangement of the ultrasonic transducers on the static speed pipe, actual spreading time of the ultrasonic waves in the sonic path distance can be obtained by emitting and receiving the ultrasonic waves by the ultrasonic transducers in the static speed pipe, the spreading speed Cf of the ultrasonic waves can be obtained by dividing the actual spreading time of the ultrasonic waves in the static speed pipe by the sonic path distance, flow speed of the to-be-tested gases in the measuring pipe can be obtained by substituting the obtained spreading speed Cf of the ultrasonic waves into a calculation equation, and the flow of the to-be-tested gases can be obtained. By the method and the device for detecting the ultrasonic flow by the time-difference method, online detection of the spreading speed of the ultrasonic waves can be realized, and measuring accuracy can be improved.

The invention discloses an electro-Fenton-auto-oxidation device for treating microelectronic wastewater, the device comprises a water inlet system and a method thereof, a reactor shell, a combined cathode, an anode, a power supply, an aeration system, a water outlet system and a Fe<2+> adding system, and the combined cathode comprises a membrane frame and a stainless steel wire mesh. When the device disclosed by the invention is used for treating microelectronic wastewater, the working state of the aeration system and the feeding amount of Fe<2+> can be adjusted according to the concentration change of H2O2 in inlet water, so that high-efficiency decomposition of H2O2 is realized, and residual refractory organic matters in the wastewater are oxidized and removed by effectively utilizing strong oxidizing substances generated in the decomposition process; when the decomposition rate of H2O2 in a reaction system is too high and supply is insufficient, dissolved oxygen generates H2O2 on the surface of a cathode material through intermittent aeration, and H2O2 self-compensation is realized; according to the device and the treatment method, the decomposition of H2O2 in the microelectronic wastewater and the synchronous removal of refractory organic matters can be efficiently realized with low consumption.

The invention provides a fiber bragg grating alternating current sensor which comprises a fixing rack, a cantilever beam and a magnetizer. The cantilever beam sequentially comprises a fixed end, a deformation area and a free end, wherein the fixed end is fixed on the fixing rack, and an armature is arranged at the free end. The magnetizer is in a shape of an open loop, the middle of the magnetizer is provided with a cavity for a tested lead wire to penetrate, a gap communicated with the cavity is formed between two ends of the magnetizer, and air gaps are reserved between two ends of the magnetizer and the armature. The cantilever beam further comprises a groove, only one fiber bragg grating in a pre-stretching state is arranged at the open position of the groove, two ends of the fiber bragg grating are respectively and fixedly connected with the fixed end and the free end, and the fiber bragg grating and the deformation area are parallel. The fiber bragg grating alternating current sensor is simple in structure, low in cost, capable of well testing alternating current and achieving temperature self-compensation, eliminating the influence of the temperature on the fiber bragg grating measuring current and further improving the measuring accuracy.

The invention discloses a sliding-in self-anchorage type socket connection pipe which comprises an equal-diameter pipe and a bellmouth. One end of the equal-diameter pipe is a spigot, the other end ofthe equal-diameter pipe is a connection end, one end of the bellmouth is a necking-down small end, the other end of the bellmouth is a large end, and the small end of the bellmouth is fixedly connected with the connection end of the equal-diameter pipe. The sliding-in self-anchorage type socket connection pipe is characterized by further comprising an anchorage flange with a lifting anchorage function and a guiding anchorage ring plate with a guiding anchorage function, wherein the anchorage flange is in sleeved connection with the spigot end of the equal-diameter pipe in a fixedly-connectedmode, the guiding anchorage ring plate is arranged at the large end of the bellmouth, the end face on one side of the guiding anchorage ring plate is fixedly connected with the large end of the bellmouth, the inner circumferential surface, located in the large end of the bellmouth, of the guiding anchorage ring plate is a guiding face, and the portion, located on the outer side of the large end ofthe bellmouth, of the guiding anchorage ring plate is an anchorage plate. The sliding-in self-anchorage type socket connection pipe has the advantages of being simple in structure, high in sealing reliability, fast to install, convenient to maintain and disassemble, long in service life and the like.

The invention relates to a fiber grating displacement meter based on a spring and a constant strength beam. The tail end of the constant strength beam is fixed to a housing through a beam holder, fiber gratings pasted to the two opposite sides of the constant strength beam pass the housing and are led into an armored cable; the armored cable is fixed to the housing through a cable sealing port to protect fibers; the stress bearing end of the constant strength beam is connected with one end of an inner wire rope; the other end of the inner wire rope is connected with the displacement spring which is connected with an outer wire rope; a limiter is arranged on the outer wire rope and is led out through a stay tube fixed to the housing. The fiber grating displacement meter has the advantages of high precision and good stability.

The invention provides a self-compensating free radical ion salt, a preparation method thereof and sphotoelectric device. The preparation method comprises the following steps: mixing an N-containing conjugated heterocycle with a halogenated hydrocarbon, and reacting to obtain a free radical ion salt precursor; and adding a counter ion salt into the free radical ion salt precursor, mixing, and reacting to obtain the self-compensating free radical ion salt. The method comprises the following steps: carrying out quaternary ammonium reaction on the N-heteroconjugated heterocycle and the halogenated hydrocarbon to generate a quaternary ammonium salt, inducing to generate free radicals by adopting thermal excitation method, and carrying out internal anion exchange on anions of the counter ion salt and the free radicals to improve the concentration and stability of the free radicals in an obtained system. The self-compensating free radical ion salt obtained by the preparation method can be used for modifying a cathode in a photoelectric device, the interface contact resistance is reduced, and the comprehensive efficiency and the device stability of the organic photoelectric device are improved.

The invention relates to a tunnel construction lining and ballast bed relative displacement monitoring device. The device comprises a fiber bragg grating crack sensor, a pull rod fixing clamp and a support. The fiber bragg grating crack sensor comprises a base body, a fixed boss, a semi-circular elastic sheet and a movable pull rod, wherein the fixed boss, the semi-circular elastic sheet and the movable pull rod are arranged in the base body and sequentially connected from top to bottom, a first optical fiber bragg grating and a second optical fiber bragg grating are set on the left side face and right side face of the semi-circular elastic sheet, and the first optical fiber bragg grating and the second optical fiber bragg grating are connected with a conduction optical fiber extending out of the base body. The pull rod fixing clamp comprises a base, a rotating shaft and a connecting rod, the rotating shaft is rotatably installed in the base, and the connecting rod is used for being connected with the movable pull rod; the support comprises a supporting arm, a swing arm and a mounting plate and is used for adjusting the position and angle of the fiber grating crack sensor. The device is simple and compact in structure, resistant to electromagnetic interference, capable of achieving temperature self-compensation and long-term real-time online monitoring, long in service life and convenient to adjust in position and angle.

The invention relates to a thin-tube laser beam quality self-compensation method and device. According to the method, a right-angle conical surface reflection device is added to one end of a thin tubegain medium of a thin tube solid laser, so that light emitted by the thin tube medium returns to a thin tube at a radial symmetry point of an emitting point of the light and is reversely propagated,wavefront distortion caused by static errors of the thin tube is self-compensated, and the quality of a light beam is effectively improved.

The invention relates to a water working medium high-temperature heat supply heat pump system for recovering waste heat. The system comprises a waste heat recovery system, a water working medium high-temperature heat supply heat pump system body and a solar auxiliary heating storage system, wherein the waste heat recovery system comprises a waste heat liquid inlet pipeline, an evaporator and a waste heat liquid return pipeline which are in fluid communication in sequence. The water working medium high-temperature heat supply heat pump system body comprises a liquid storage tank, a circulating pump, an evaporator, a water vapor compressor, a condenser and a liquid collection tank, wherein the liquid storage tank, the circulating pump and the evaporator are sequentially in fluid communication to form a first fluid circulation loop, the liquid storage tank, the water vapor compressor, the condenser and the liquid collection tank are sequentially in fluid communication to form a second fluid circulation loop, and the liquid collection tank is in fluid communication with the water vapor compressor and used for inputting condensate into the water vapor compressor. According to the invention, the liquid collection tank can automatically compensate for the water vapor compressor, and solar energy can be introduced to heat waste heat liquid when waste heat is insufficient.

The invention discloses a two-dimensional thermal temperature difference type wind speed sensor and an ambient self-compensation method for the same, and belongs to the field of wind speed sensors. Bythe aid of the two-dimensional thermal temperature difference type wind speed sensor and the ambient self-compensation method, the problem of low detection speeds of existing aluminum nitride base thermal temperature difference type wind speed sensors can be solved. The two-dimensional thermal temperature difference type wind speed sensor is characterized in that a heat conduction medium layer islaid on a substrate with low heat conductivity, and a heating electrode, four temperature detection electrodes and two ambient temperature self-compensation electrodes are arranged on the heat conduction medium layer. A square heating electrode body is arranged in the center of the heat conduction medium layer, four fan-shaped temperature detection electrode bodies are arranged on the periphery of the heating electrode body, and two ambient temperature self-compensation electrode bodies are arranged at two opposite edges of the heating medium layer. Each electrode body is provided with two extraction electrodes. The ambient self-compensation method includes determining ambient temperature values according to resistance values of the two ambient temperature self-compensation electrodes; regulating voltage frequencies of two ends of the heating electrode according to change of the ambient temperature values so as to allow temperature fields of the two-dimensional thermal temperature difference type wind speed sensor to be constant.

The invention relates to a temperature self-compensation FBG (Fiber Bragg Grating) refractive index sensor based on conical corrosion. In the invention, a broadband light source is directly connected with a first port of a 3dB coupler through light, a second port of the 3dB coupler is connected with a conical-corrosion FBG, and a third port of the 3dB coupler is connected to a spectrograph. The invention has the advantages that the problem of cross sensitivity among physical parameters in a refractive-index measurement sensing technology can be effectively solved to realize sensing measurement of the refractive index by means of temperature self-compensation, and the sensor has a compact structure, further improved measurement precision and stronger antijamming capability to optical fibervibration and the like. Meanwhile, an additional FBG does not need to be cascaded, so that the cost of the sensor is greatly reduced and the sensing measurement for multipoint distribution is easy.