111results about How to "Large dynamic range" patented technology

The invention discloses a transmission network fault positioning method, system and device and a storage medium, and relates to the field of communication, and the method comprises the steps: firstly, collecting network data to construct a multi-granularity network topology model, then obtaining original alarm data, analyzing the topology association relationship between alarms, and obtaining a multi-granularity network topology model; and mining horizontal peer association and vertical upstream and downstream association among the alarm objects, and identifying multi-alarm data of each alarm object. Thirdly, constructing an associated alarm directed graph based on the multi-alarm data, and performing associated alarm compression on the associated alarm directed graph to obtain a compressed alarm set; and finally, constructing an alarm propagation graph based on the compressed alarm set and the multi-granularity network topology model, querying the alarm propagation graph through a reverse hierarchical sorting algorithm, and determining a root alarm. According to the method, through innovative methods such as topological modeling, association mining, graph compression and reverse sequencing, alarm data and a topological structure are closely combined, an alarm propagation rule is analyzed, and fault root causes are diagnosed.

The invention relates to a backside illuminated image sensor and a preparation method thereof, and electronic equipment, and relates to the technical field of integrated circuits, the backside illuminated image sensor comprises a substrate, and photodiodes and laminated target isolation structures which are located on a first surface of the substrate, are alternately arranged along a first direction parallel to the first surface, and extend towards the substrate; the substrate internally comprises a plurality of trench isolation structures which extend into the substrate through the first surface and are arranged at intervals in the first direction; the trench isolation structures and the laminated target isolation structures right above the trench isolation structures are arranged in a one-to-one manner; the laminated target isolation structure comprises isolation parts and insulation parts which are sequentially and alternately laminated along a second direction deviating from the substrate; the photodiode comprises at least two photosensitive layers which are sequentially stacked in the second direction, the longitudinal sections of the photosensitive layers are T-shaped, one photosensitive layer makes contact with the first surface of the substrate, substrate damage caused by ion implantation can be avoided, and meanwhile the photoelectric conversion efficiency and the quantum efficiency are improved.

The present invention belongs to the field of optical fiber measurement technology, and specifically relates to an optical fiber distributed polarization crosstalk fast measurement device based on optical frequency domain interference. The device comprises a tunable laser source module (1), a device to be measured module (2), an auxiliary interferometer module (3) and a signal acquisition and analysis module (4), and is characterized in that: a high-coherence tunable laser is used to perform fast wavelength scanning on an optical signal, and a linear frequency modulated continuous light (501) is output, which passes through a polarizer (202), a device to be measured (206) and an analyzer (210) in sequence, and a beat frequency signal generated by the interference of a coupling light (704) and a transmission light (701) is obtained in the optical frequency domain, and then an optical path difference and a normalized interference signal amplitude are calculated, thereby respectively determining the polarization crosstalk position and intensity. The present invention, in combination with a tunable laser, gets rid of the dependence on an optical path scanning delay device in polarization crosstalk measurement, greatly improves the speed and dynamic range of polarization crosstalk measurement, and has a compact structure, is stable and reliable, and is easy to implement.

The invention provides a control method of a high-gain image sensor, which is characterized in that a column bias current source and a column PMOS (P-channel Metal Oxide Semiconductor) amplifier tube are arranged in a column signal reading unit, the column bias current source is connected with a current output connecting line shared by a column, and a drain electrode of the column PMOS amplifier tube is connected with a current input connecting line shared by the column; the grid electrode of the column PMOS amplifier tube is connected with the common current output connecting line of the column directly or through a capacitor, and an amplified signal of a floating diffusion region of a read-out pixel unit can be obtained on the common current input connecting line of the column, so that the ultrahigh conversion gain is realized, and the dynamic range in a dark light scene is expanded; the size of a device structure in the column signal reading unit can be far larger than that of a transistor in a pixel, the process consistency is better, and the conversion gain can be adjusted more flexibly; the switching between the SHCG mode and the STD mode is realized by driving the switch module in the column signal reading unit, the impact on a power supply and the ground is smaller during operation, and the circuit stability is improved.

The invention discloses a composite loop tracking method of an anti-interference navigation signal receiver. The method comprises the following steps: copying a pseudo code and a carrier corresponding to a satellite signal based on a roughly captured signal; performing coherent operation to obtain a coherent integral value; performing FLL frequency discrimination, PLL phase discrimination and FFT frequency discrimination on the coherent integral value, and performing weighting processing to obtain a frequency error; carrying out carrier loop filtering on the frequency error to output a carrier loop tracking result; performing incoherent accumulation to obtain an incoherent integration result, and performing DLL phase discrimination to obtain an epoch code loop phase difference; performing code loop filtering on the epoch code loop phase difference to output a code loop tracking result; calculating a first frequency control word corresponding to the code loop according to the wave loop tracking result; and controlling code loop updating based on the first frequency control word and the code loop tracking result. According to the invention, stable tracking of navigation signals in different dynamic and different interference scenes can be realized.

The invention provides a current detection and circuit protection method and system for a chip, and relates to the technical field of chips, and the method comprises the steps: obtaining a current detection result of a target chip; comparing the current detection result with a preset current threshold value, if the target chip is over-current, adaptively determining a multi-gear protection grade corresponding to the comparison result according to the comparison result of the current detection result and the preset current threshold value, and determining a corresponding protection strategy based on the multi-gear protection grade; according to the protection strategy, an adjustable current limiting module in a power supply circuit of the target chip is controlled to gradually recover the power supply current of the target chip in stages, and whether the current detection result exceeds the preset current threshold value or not is judged when each recovery stage is ended; and if so, returning to the previous recovery stage to continue recovery until the power supply current of the target chip is recovered to the normal working state within the preset recovery time.

A single-photon imaging method based on time information marking comprises the steps that a single-frame binary image containing a timestamp is obtained by collecting sparse photons passing through a sample in a transmission mode, an estimated value of space coordinates of incident photons is obtained through PSF fitting and centroid averaging, an initial reconstructed image containing average photon number estimation is obtained through timestamp reconstruction, and a single-frame binary image containing the average photon number estimation is obtained. And obtaining a final reconstructed image through de-noising optimization processing. According to the method, the arrival time of a photon event is recorded, a probability distribution image of photons is obtained through reconstruction by using a timestamp algorithm, and the image is optimized through post-processing algorithms such as position calibration and filtering and denoising, so that a clear weak light imaging result is obtained.

The invention discloses a dual-channel millimeter wave transmitter, a receiver and a transceiver system. The transmitter comprises a baseband signal processing circuit, a local oscillator signal processing circuit and a radio frequency front-end circuit comprising a high-frequency channel power amplifier, a low-frequency channel power amplifier and a signal synthesis switching circuit. The radio frequency front-end circuit selectively outputs signals of a high-frequency channel or a low-frequency channel through the signal synthesis switching circuit, and a current adjusting circuit is arranged in the baseband signal processing circuit and used for adjusting mismatch of a switching tube in the mixer. The disclosure also provides a dual-channel millimeter wave receiver and transceiver system based on the same concept. According to the invention, the problem of performance bottleneck of a single-channel transceiver in broadband application is solved, the system linearity is improved, the processing capability of high-order modulation signals is improved, and high power efficiency and high integration level are maintained through optimized circuit design.

The invention discloses a high-resolution FPI spectrum demodulation method, and relates to the field of optical fiber sensing. Comprising the following steps: acquiring an FPI interference spectrum, and performing pretreatment, including spectrum standardization, wave number conversion and wave number domain interpolation, on the acquired spectrum; performing FFT (Fast Fourier Transform) on the interpolated spectrum to obtain an amplitude spectrum and a phase spectrum; roughly estimating the F-P cavity length through a corrected amplitude spectrum Buneman algorithm; and the F-P cavity length is accurately calculated in combination with the phase spectrum. The FPI sensor demodulated according to the method can realize real-time monitoring of various environmental parameters including vibration, pressure and temperature, and compared with other demodulation methods, the method provided by the invention has the characteristics of high resolution, small calculation amount and large dynamic range, and has stable performance under the condition of low signal-to-noise ratio.

The invention relates to the technical field of photoelectric sensors, and discloses a photoelectric conversion device and electronic equipment, the photoelectric conversion device comprises an SPAD device, a quenching module, a counting module, a time analog conversion module and a data processing module; when the count value is not greater than the preset value, the data processing module uses the count value to represent the ambient light intensity; and when the count value is greater than the preset value, calculating the average voltage corresponding to the average value of the pulse widths of the electric signals in the whole exposure period according to the accumulated value of the analog voltage, and representing the ambient light intensity by using the average voltage. According to the invention, the counting module is firstly used for counting the number of photons received by the SPAD device, and when the counting value reaches a set value, the time analog conversion module is switched to represent the ambient light intensity, so that the dynamic range of photon detection is expanded without increasing power consumption, the photons can be detected when the light intensity is relatively low or relatively high, and the detection efficiency is improved. And the condition of inaccurate counting caused by saturation of the counter due to increase of the light intensity is avoided.

The invention relates to a small-pixel-size infrared detector reading circuit with a self-adaptive integrating capacitor, and belongs to the technical field of infrared detector reading circuits. According to the circuit, the NMOS variable capacitor is adopted to replace a traditional capacitor, and the characteristic that the capacitance value of the NMOS variable capacitor is adaptively adjusted along with the change of light intensity is utilized, so that the condition of supersaturation or underexposure of integral charge quantity is effectively avoided, and the dynamic range of the reading circuit is enlarged. Besides, the circuit adopts a folding cascode operational amplifier, good injection efficiency and linearity are guaranteed, the scheme that four pixels share one CTIA structure in a time-sharing mode is adopted, the layout area of the reading circuit is optimized, and the reading circuit can adapt to infrared detectors with smaller pixels and larger arrays. The circuit is simple in structure and easy to realize, has the advantages of low power consumption, wide dynamic range and the like, and is suitable for the design of an intelligent infrared detector reading circuit with high integration, low power consumption and wide dynamic range.

The invention discloses a biased binocular visual odometer method and device based on strawberry cuttlefish bionics. The biased binocular visual odometer method comprises the following steps: synchronously acquiring a bright field image and a dark field image collected by a biased binocular camera and inertial data of an inertial measurement unit; constructing a perceptual attention weight grid according to the bright field image and the dark field image, and performing brightness normalization processing on the bright field image and the dark field image; extracting lateral visual features based on the normalized image and the perceptual attention weight grid; and fusing the biased visual features with the inertial data, and solving through nonlinear optimization to obtain a carrier pose estimation result. According to the invention, the dynamic range of the binocular vision system is expanded, and the imaging and sensing capabilities of the system in an HDR scene are improved. And meanwhile, the positioning precision and robustness of the binocular visual odometer in an HDR scene are improved.

The utility model relates to an artificial chamber surrounding rock and artificial chamber deformation monitoring system, which comprises a surrounding rock circumferential sensing optical cable and a surrounding rock parallel sensing optical cable which are arranged in the surrounding rock of a chamber, and a chamber circumferential sensing optical cable and a chamber parallel sensing optical cable which are arranged on the surface of the chamber, one end of the surrounding rock annular sensing optical cable is connected with the surrounding rock parallel sensing optical cables which are sequentially connected in series, the other end of the surrounding rock annular sensing optical cable extends out of a chamber, one end of the chamber annular sensing optical cable is connected with the chamber parallel sensing optical cables which are sequentially connected in series, and the other end of the chamber annular sensing optical cable extends out of the chamber. The distributed optical fiber deformation monitoring equipment is connected in series or in parallel with the surrounding rock circumferential sensing optical cable and the chamber circumferential sensing optical cable which extend out of the chamber through transmission optical cables. The distributed sensing optical cables are arranged in the surrounding rock of the artificial chamber and on the surface of the chamber, so that the deformation of the surface structure can be monitored, and the deformation of the internal structure of the chamber can also be monitored.

The present invention discloses a method for analyzing the chemical composition and content determination of Chlorophytum comosum based on liquid chromatography-quadrupole-electrostatic field orbital trap tandem mass spectrometry, including preparing a reference solution, preparing a test solution, and chromatographic analysis, wherein the chemical composition analysis also includes mass spectrometry analysis and data processing. This application is the first to simultaneously quantitatively analyze three types of components in Chlorophytum comosum, namely flavonoids, phenylethanoid glycosides, and organic acids. The results show that the contents of these five components in medicinal materials from different origins vary greatly, which may be due to factors such as different origins, growth environments, climatic conditions, and harvesting times that affect the accumulation of compounds in plants. The specific reasons need further study.

The invention provides a laser linewidth measurement system and method based on a short optical fiber circulation self-heterodyne method, and can be applied to the technical field of laser measurement. The system comprises a to-be-measured laser used for outputting a to-be-measured laser signal; the Y-shaped single-mode optical fiber beam splitter is used for dividing a laser signal to be measured into two paths; the acousto-optic modulator is used for moving the frequency of one path of laser signal to be measured by a fixed amount and outputting a first optical signal; the optical fiber cyclic delay loop is used for circularly delaying the other path of laser signal to be measured and outputting a second optical signal; the Y-type single-mode optical fiber coupler is used for carrying out interference on the first optical signal and the second optical signal and outputting a third optical signal; the adjustable optical fiber attenuator is used for attenuating the third optical signal to the response range of the photoelectric detector and outputting a fourth optical signal; the photoelectric detector is used for converting the fourth optical signal into an electric signal; and the signal processing module is used for obtaining the line width of the to-be-measured laser according to the electric signal. Interference signals of different orders can be sampled and analyzed at the same time.

Glial fibrillary acid protein detection kit. The present invention relates to a kit for diagnosing markers of neurodegenerative diseases (particularly Alzheimer's disease), and in particular to a kit for detecting glial fibrillary acid protein (GFAP), wherein the kit detects GFAP based on single molecule detection technology. In addition, it also relates to a single molecule detection system for detecting GFAP. The present invention can achieve extremely high sensitivity while performing rapid detection, and the kit has high stability, a simple system, and low cost.

The invention discloses an online absorbance detection system with a high dynamic range. The online absorbance detection system comprises a flow cell, a multi-light source assembly, a detection assembly and an electronic control unit, the multi-light-source assembly comprises at least two light sources and at least two incident optical fibers, the front ends of the incident optical fibers are arranged in the flow cell at different insertion depths, and the incident optical fibers and the emergent optical fibers form different optical path lengths; the electronic control unit is lightened by driving the light source in a time-sharing manner, and optical signals under different optical paths are synchronously acquired by using the same detection assembly. Through the structural design without a mechanical moving part, a multi-optical-path detection system is constructed by utilizing the difference of the depth of the optical fiber inserted into the flow cell, and by combining a data processing algorithm in the electronic control unit, the optimal optical path is automatically selected according to the signal intensity to calculate the absorbance. The system has the advantages of wide dynamic range, simple structure, high response speed and the like, and effectively solves the problems of limited high and low concentration detection caused by a fixed optical path and abrasion and lag caused by mechanical switching of the optical path in the prior art.

The application discloses an optical power collection device and method, relates to the technical field of optical signal detection, and comprises the following: a photoelectric detector for converting an optical signal into a current signal; a transimpedance amplifier for converting the current signal into a pulse voltage signal; a peak detector for detecting the peak value of the pulse voltage signal; an RC filter network for filtering noise of the pulse voltage signal; a low-frequency amplifier for amplifying the low-frequency pulse voltage signal; an ADC collection module for converting the amplified pulse voltage signal into a digital signal; a first feedback network for adjusting the gain of the transimpedance amplifier; a second feedback network for adjusting the gain of the low-frequency amplifier; and a microcontroller for controlling the first feedback network to adjust the gain of the transimpedance amplifier according to the peak value of the pulse voltage signal and for controlling the second feedback network to adjust the gain of the low-frequency amplifier according to the digital signal.

The present invention belongs to the field of optical fiber measurement technology, and specifically relates to a distributed polarization crosstalk fast measurement device based on optical frequency domain frequency shift interference, the device includes a tunable laser source module, a device to be measured module, a main interferometer module, an auxiliary interferometer module and a signal acquisition and analysis module, and is characterized in that: a tunable laser is used to perform fast wavelength scanning, a main interferometer is used to perform frequency shift on an interference beat frequency signal, and the position and intensity of polarization crosstalk are determined by obtaining the optical path difference between coupled light and transmitted light and the normalized interference signal amplitude, while also eliminating the signal aliasing problem caused by 1 / f flicker noise at low frequencies and light source frequency scanning nonlinearity. The present invention, combined with a tunable laser, gets rid of the dependence on an optical path scanning delay device in polarization crosstalk measurement, realizes an all-fiber structure without moving parts, enhances the reliability and stability of the test system, and greatly improves the speed and signal-to-noise ratio of polarization crosstalk measurement in principle.

The present invention discloses a signal adjustment circuit and an imaging device. The signal adjustment circuit comprises a photosensitive module, which is used for converting a light signal into an initial electric signal; an adjustment module, which is used for comparing the initial electric signal with a reference threshold value and adjusting the initial electric signal according to the comparison result until the adjusted electric signal is within the reference threshold value range; an analog-to-digital conversion module, which is used for converting the adjusted electric signal into a digital signal; and a processing module, which is used for restoring the digital signal to obtain the initial electric signal. The present invention adjusts the light signal by adding the adjustment module, ensures that the light signal is within the threshold range of the analog-to-digital conversion module before conversion and output, thereby effectively expanding the dynamic range of the analog-to-digital conversion module in a strong light environment and improving the application range of TOF.

The utility model relates to the technical field of headlight detection, in particular to a headlight detection system, which comprises a power supply module, a shunt resistor, an INA237 chip, a microcontroller, an alarm module and a communication module, the power supply module is used for being connected with an automobile power supply and supplying power to a circuit, the shunt resistor is connected in series in an automobile headlight power supply loop and used for current sampling, and the INA237 chip is connected with the microcontroller. The microcontroller is in communication connection with the INA237 chip and used for receiving and processing current, voltage and temperature data, the alarm module is connected with the microcontroller and used for receiving abnormal signals output by the microcontroller and giving an alarm, and the communication module is connected with the microcontroller and used for transmitting detection data to external equipment. The utility model provides a high-integration and high-precision detection circuit based on an INA237 chip, which realizes real-time monitoring and abnormal alarm of current, voltage and temperature of an automobile headlamp.

This invention discloses a wide dynamic range substrate reagent, belonging to the field of biological detection reagent technology. The reagent consists of the following components: citric acid, 9.6 g / L; 3,3',5,5'-tetramethylbenzidine, 0.29 g / L; 3% hydrogen peroxide solution, 3 mL / L; 1 g / L polyvinyl alcohol; 0.5 g / L copovidone W-735; 0.5 g / L dimethyldiallylammonium chloride-acrylamide copolymer; 1 g / L PVP K30; and Tween 20, 0.005 g / L. mL / L; polyethylene glycol 10g-50g / L; pure water, balance. This invention, by adding specific polyethylene glycol and synergistically combining with other components, significantly reduces the reagent background signal and improves detection sensitivity; effectively broadens the detection dynamic range and increases the detection upper limit of high-concentration analytes; improves the linear correlation between signal and concentration; and enhances the thermally accelerated stability of the reagent. This reagent has comprehensive performance and is especially suitable for ELISA detection systems with high sensitivity and wide detection range.

This application relates to the field of infrared remote sensing instrument calibration technology, and provides a high-dynamic-range, large-aperture, high-precision on-board blackbody radiation source and its temperature control method. The main body of this on-board blackbody radiation source is temperature-controlled by a refrigerator, exhibiting a large dynamic range, capable of temperature control from 200K to 310K. Through a three-layer structure consisting of the radiation source cavity, a cooling inner shell, and an outer shell, zoned temperature control via a heat transfer bracket, and a three-layer thermal insulation installation design, the temperature uniformity and stability of the blackbody radiation source are significantly improved, with temperature uniformity exceeding 30mK. Simultaneously, it possesses high emissivity (spectral emissivity reaching 0.998) and an aperture as large as 310mm, meeting the requirements for large field-of-view, long-distance use.

The embodiment of the invention discloses a sensor pixel unit, a signal processing device and electronic equipment. The sensor pixel unit comprises a photodiode, a charge buffer module, a first output module and a second output module, the photodiode is used for receiving an optical signal in an exposure duration to generate photoelectric charges; the charge cache module is used for storing photoelectric charges generated by the photodiode when exposure duration is reached, and inputting the stored photoelectric charges into the first output module according to control of an external signal; the first output module is used for generating a first signal according to the photoelectric charge received from the charge buffer module and outputting the first signal; and the second output module is used for outputting a second signal in response to the condition that the photoelectric charge quantity generated in the photodiode reaches the exposure threshold. According to the embodiment of the invention, the dynamic range of the image sensor is widened on the premise that the number of the photodiodes is not increased.

The invention provides a large dynamic range micro-optical accelerometer. The accelerometer is composed of an optical transceiver module, a beam splitting and combining module, an MEMS sensitive unit and a packaging substrate, the optical transceiver module is composed of a laser and a plurality of detectors, the beam splitting module is composed of a diffraction grating, the MEMS sensitive unit is composed of a spring-mass block with a reflector, and the packaging substrate is composed of an upper substrate, a lower substrate and a supporting substrate. According to the invention, the detection of multiple diffraction orders of the micro-optical accelerometer is realized, the dynamic range of the system is improved by using high-order diffraction light, and the acceleration measurement with high precision and large dynamic range is realized.

The invention provides a gas-sensitive optical fiber leakage monitoring and accurate positioning system, which belongs to the field of gas monitoring, and is characterized in that a light source module generates first wavelength laser and second wavelength laser, the first wavelength laser and the second wavelength laser are combined by a wavelength division multiplexer to obtain dual-wavelength composite laser, and the dual-wavelength composite laser is transmitted to each sensing node module through an optical fiber transmission channel; the sensing node module divides the dual-wavelength composite laser into power supply light and signal light, the power supply light is converted into electric energy through photoelectric conversion, a layered heterogeneous gas-sensitive material structure is adopted to detect the environmental gas concentration and output a voltage signal, and phase modulation is performed through a ferroelectric liquid crystal element; the signal processing module calculates according to the modulated signal light to obtain a gas concentration value at each sensing node module and a spatial position of a leakage source; and the control processing module receives and processes the spatial position of the leakage source and the gas concentration value and gives an alarm. According to the invention, simultaneous monitoring and identification of multi-component gas are realized, and high-precision monitoring and accurate positioning of leakage of various gases are realized.

The invention provides a flexible pressure sensitive element based on a spring-shaped polymer optical fiber, a preparation method of the flexible pressure sensitive element and a sensing system. In order to further improve the detection sensitivity of the polymer optical fiber sensor and the compactness of the device, the flexible pressure-sensitive optical fiber element provided by the invention comprises an elastic material substrate and a polymer optical fiber which are wound into a spring-shaped structure and shaped in a heating manner. The element is combined with an optical fiber sensing technology to realize high-sensitivity tactile sensing. When the structure is subjected to external pressure, the bending radius of the structure changes, and then the intensity of optical signals transmitted through the optical fiber is affected. The sensor provided by the invention has the characteristics of simple and convenient preparation process, low cost, high sensitivity, compact structure and adjustability, and establishes a corresponding relation between light intensity and pressure by measuring the change of light signal intensity of the optical fiber element under the action of the pressure, thereby realizing high-precision detection of the pressure.

The application discloses a kind of wide dynamic range diamond NV color center magnetic sensing method and system, wherein, method includes: (1) in initial magnetic field environment, the initial resonance frequency and magnetic sensing coefficient of diamond NV color center are calibrated;(2) in the magnetic field environment to be measured, microwave generator is with current resonance frequency as center frequency to diamond NV color center and is applied frequency-modulated microwave;Real-time demodulation is carried out to fluorescence signal using phase-locked detection technology, and an error signal is obtained;According to error signal and magnetic sensing coefficient, the detuning of center frequency is calculated in real time, and the change amount of magnetic field intensity is further calculated;While, detuning is fed back to microwave generator to track the resonance frequency of diamond NV color center;(3) by continuously repeating step (2), the magnetic field measurement of wide dynamic range is realized.The application has the advantages of wide dynamic range, strong and weak field mixed signal detection ability in complex application scene while considering magnetic sensing sensitivity.

A multi-chain measurement circuit is disclosed. The measurement circuit includes a first chain and a second chain of series snubber circuits coupled in parallel, each series snubber circuit propagating an input signal. The set of storage circuits is configured to store logic values generated by the first set of buffer circuits and the second set of buffer circuits in response to a transition of the clock signal. The logic value stored in the storage circuit produces a digital value indicating a total number of series storage circuits through which the input signal has propagated when operating the transition of the clock signal.

The invention discloses a three-wavelength optical fiber Fabry-Perot acoustic sensor demodulation method and system based on phase compensation, and the method comprises the steps: carrying out the full-spectrum scanning of an optical fiber Fabry-Perot acoustic sensor in response to a scanning mode working instruction, synchronously collecting light intensity data, obtaining the interference spectrum of the sensor, and calculating the initial cavity length of the sensor; obtaining output wavelengths of three paths of signals of the laser, obtaining initial phases corresponding to the three paths of signals, constructing two paths of orthogonal signals, and demodulating the cavity length variation; whether the cavity length variation exceeds a threshold value or not is judged, if yes, the initial cavity length of the sensor is updated, and phase orthogonality of the two paths of reconstructed signals is stabilized. According to the invention, the problem that the demodulation precision is reduced due to large cavity length variation in the traditional three-wavelength demodulation technology is solved, a phase compensation scheme is provided to realize the quadrature phase maintenance of the reconstructed signal, and the rapid demodulation of sensors with good stability, large dynamic range, high precision and different cavity lengths can be realized.