404 results about "Polarization modulation" patented technology

The invention provides an adjustable spectrum-based liquid crystal display system and a control method thereof, relates to the technical field of display systems, and aims to overcome the limitations of poor environmental adaptability, easiness in causing visual fatigue, single user experience and the like of an existing display. The system creatively integrates a liquid crystal panel, a high-precision multi-main-color Micro-LED backlight, a pixel inner sensing array, an external multi-mode sensing module, a dynamic addressable micro-optical array, a dynamic polarization modulation layer and an optional transparent energy collection layer. The intelligent controller carries out fusion processing on the real-time biological state, environment information and application context data of the user obtained by the multi-source sensor, and carries out accurate state evaluation and future trend prediction. And determining an optimal space-time-direction-spectrum-polarized light field output characteristic and an intelligent energy management strategy through a multi-objective optimization decision engine, and driving each optical regulation and control component to execute in real time. The visual comfort and health level are remarkably improved, and the information fidelity and task performance in a complex environment are ensured.

The invention provides a self-adaptive polarization modulation-based inter-satellite laser communication and signal scheduling method, which relates to the field of laser communication, and comprises the following steps of: acquiring polarization state information of emitted and received light beams, calculating a mismatch degree, generating a compensation parameter, constructing a polarization state prediction model by using a deep learning neural network for pre-correction, and calculating the mismatch degree; a polarization modulator is adopted to perform real-time modulation and establish a link quality evaluation model, carrier synchronization and channel compensation are realized based on an adaptive optical carrier recovery technology of coherent detection, a link state is monitored in real time, and a training data set is updated.

The invention relates to a method and a system for inhibiting strong mutual reflection based on polarization complementary logic coding. The method comprises the following steps: acquiring calibration parameters of a camera and a projector; generating a polarization phase shift stripe based on the calibration parameter, designing a high-frequency complementary logic code word, and embedding the high-frequency complementary logic code word into a polarization channel through polarization modulation to obtain a composite stripe pattern; the method comprises the following steps: calculating to obtain a linear polarization degree image through an acquired multi-angle polarization image, extracting a high-reflection region from the linear polarization degree image by adopting an adaptive threshold segmentation method, and carrying out binarization processing on the linear polarization degree image to obtain a binarized linear polarization degree mask; and on the basis of a decoding range of a binary linear polarization degree mask constraint high-reflection region, decoding the composite stripe pattern to obtain absolute phase level information, and performing noise suppression on the absolute phase level information by adopting a self-adaptive threshold algorithm. The method can effectively solve the influence of mutual reflection and high dynamic range of the surfaces of the measured object, and improves the precision and stability of three-dimensional reconstruction.

The invention discloses a special environment laser radar system and method based on polarization modulation and laser coding. The laser radar system comprises a polarization modulation laser emitting unit, a multi-channel receiving unit and a compressed sensing reconstruction unit. The polarization modulation laser emission unit comprises a laser, a beam expanding module, a spatial light modulator, a micro galvanometer array, a spatial filter and a first focusing lens which are arranged in sequence; the multi-channel receiving unit comprises a second focusing lens, a polarization beam splitter and a single-pixel detector array which are arranged in sequence; and the compressed sensing reconstruction unit comprises a compressed sensing processing module, an image reconstruction module and a loop adaptive control module which are arranged in sequence. The anti-interference capability in a complex environment is enhanced through polarization modulation, the detection resolution and the signal-to-noise ratio are improved in combination with laser coding, the imaging quality and stability of the laser radar in a special environment are greatly improved, and the method can be widely applied to the fields of military reconnaissance, disaster rescue, unmanned driving and the like.

The invention discloses a rapid polarized light acoustic imaging device which comprises an excitation source, a light beam shaping module, a rapid polarization modulation module, an energy feedback module, a rapid scanning module and an acquisition processing module. And receiving photoacoustic signals corresponding to the exciting light in four different polarization states for calculation, and extracting anisotropy information of the sample. Compared with multiple times of scanning a sample or modulating the polarization state by rotating a half-wave plate, the problems of dislocation of multiple times of polarization acquisition points and false positive calculation are avoided, meanwhile, the time interval generated by continuously modulating the laser pulses is short, and energy fluctuation among the four pulses and errors caused by fluctuation are reduced. According to the invention, the limitation of the precision and speed of polarized light acoustic microscopic imaging is overcome, the microstructure characteristics in the target sample can be rapidly, accurately and highly sensitively detected, and the method has great application prospects in biomedical imaging and high-precision material detection.

The invention relates to the technical field of damage detection, and discloses a screen protection film damage detection method and system, and the method comprises the steps: carrying out the laser interference thickness scanning of a screen protection film, and obtaining three-dimensional thickness distribution data and thickness gradient vector field data; performing multi-layer polarization interference detection on the circularly polarized light beam based on the three-dimensional thickness distribution data to obtain polarization phase difference distribution data; according to the thickness gradient vector field data, non-periodic phase unenveloping processing is carried out on the polarization phase difference distribution data to obtain continuous polarization phase distribution data; performing stress optical coefficient tensor calculation and dynamic elliptical polarization modulation based on the continuous polarization phase distribution data to obtain stress damage space positioning data; the edge cutting area and the center bending area of the screen protection film are subjected to damage imaging reconstruction, a three-dimensional stress damage imaging result is obtained, and full-chain detection from geometric thickness change to stress distribution and then to damage positioning is achieved.

The invention provides a low-chromatic-aberration transparent display device in order to solve the problem that chromatic aberration easily occurs in polarization modulation stereoscopic display adopting a 1 / 4 wave plate. The low-color-difference transparent display device comprises a directional polarization light source, a reflector and a transparent liquid crystal display panel. The pixels on the upper portion of the 2D display panel are lightened in a time-division multiplexing mode and any time slice slot, light rays of the pixels are projected through the lens array and then reflected through the reflector, the polarization direction of the light rays is adjusted, and then the light rays penetrate through the transparent liquid crystal display panel to form viewpoints. The transparent liquid crystal display panel synchronously provides a parallax image corresponding to the viewpoint position. The sub-pixel value of any one lightened pixel on the 2D display panel is modulated to be a fixed value related to the included angle of the lens, so that colored light generated by the pixel is restored to be white light after being polarized by the polarizer, the polarization direction is adjusted by the 1 / 4 wave plate and the polarization of the analyzer. At the moment, a directional light source without chromatic aberration is provided for the transparent liquid crystal display panel, so that chromatic aberration introduced by the polaroid and the wave plate is reduced.

The invention discloses a device and a method for low-thermal-damage laser stripping and cutting of transparent materials, the device comprises a laser, and a first half-wave plate, a linear polarizer, a beam expander, a second half-wave plate, a vortex wave plate and a processing objective lens which are sequentially arranged along the laser transmission direction, and emergent light of the processing objective lens enters a processing material; a machining material is adsorbed and fixed to the cooling suction cup, and the cooling suction cup is installed on the three-dimensional moving platform. Light subjected to polarization modulation is focused into a material through the objective lens to be modified, a complete modified layer is formed along with movement of the three-dimensional platform, the device and the method have the advantages of low thermal damage and high precision when being used for stripping and cutting, and material loss caused in the laser machining process can be reduced.

An optical detector system providing electrical output signals. The system includes an apertured surface and a transparent window, with a metasurface on the window's opposite side. The metasurface imparts spatially varying phase delay and / or amplitude or polarization modulation to deflect ILR based on their angle of incidence, producing exiting light rays. These rays are detected by a two-dimensional tetralateral position-sensing detector (TLD) with a single resistive photo-absorption layer and four electrodes. The TLD generates X-Y position signals proportional to the azimuth and elevation of the incoming ILR. A computer may be included to calculate these angular values from the position signals.

The invention provides a non-contact polarized light acoustic detection device and method for identifying the quality of traditional Chinese medicinal materials. According to the device, a traditional Chinese medicinal material sample is excited by using a polarization-modulated pulse excitation light beam, and refractive index change caused by photoacoustic initial pressure generated when the sample absorbs excitation light pulse energy is measured by using a continuous wave detection light beam confocal with the excitation light beam. By detecting the reflection component of the detection light beam, the device can obtain anisotropic optical absorption information of the traditional Chinese medicinal materials. The traditional Chinese medicinal material polarized light acoustic image and the anisotropic characteristic information thereof are obtained by using the non-contact polarized light acoustic detection device and method, the quality of the traditional Chinese medicinal material can be identified, the traditional Chinese medicinal material sample is not damaged in the whole process, and non-contact in-situ detection is realized.

The invention relates to a micro display device for a bifocal plane HUD (head up display) system, which solves the problems of halved field of view, limited working bandwidth, low color saturation and low brightness of the existing bifocal plane HUD system, and comprises an image display module and a polarization modulation element arranged above the image display module, the polarization modulation element is used for polarization modulation of display pixels, the effective area of the sub-wavelength medium grating arrangement is equivalent to a 1 / 2 wave plate, the display pixels are separated in a row-by-row or column-by-column staggered mode through the sub-wavelength medium grating arrangement, and the problem that the view field is halved due to an existing target surface space partitioning scheme is solved. The two adjacent sub-wavelength medium gratings convert incident light into linear polarization states in two directions, the two directions are mutually orthogonal, and the two spaced sub-wavelength medium gratings are completely the same, so that the two images are respectively adjusted into the mutually orthogonal linear polarization states, and the two images are generated in a staggered manner.

The invention relates to the technical field of wafer detection, in particular to a wafer defect detection method and device, and aims to detect wafer defects by adopting a polarization modulation and decomposition scheme according to corresponding characteristics of wafer surface scattered light and defect scattered light in a wafer defect detection process. The wafer detection method for improving the wafer defect detection accuracy is formed, and the wafer detection system for improving the wafer defect detection accuracy is formed according to the wafer detection method.

The invention provides a polarization modulation coupling time control phase locking high-temperature noise suppression in-situ Raman method and device, and relates to the technical field of spectrum detection. The method comprises the following steps: exciting pulse linear polarization laser to irradiate a sample to obtain Raman scattering light; a parallel vibration component (P) and a vertical vibration component (S) are obtained, and original spectral data containing polarization information and residual high-temperature noise are collected by adopting an ISCCD detector synchronously triggered by gating. Background noise is removed and a parallel vibration component (P) is extracted through polarization differential processing in combination with adaptive filtering (dynamically adjusting parameters according to signal distribution) and principal component analysis (PCA); and finally, performing signal-to-noise ratio optimization on the pure component by applying a phase locking algorithm to finally obtain a Raman spectrum result with a high signal-to-noise ratio. According to the invention, the in-situ Raman spectrum of the material within the temperature range of room temperature to 3000 DEG C can be measured, and the detection of weak signals is more sensitive.

The invention relates to the field of optical measurement, in particular to a reflective interference film thickness measurement method and system for eliminating back scattering of a transparent substrate, and the method comprises the following steps: transmitting a light beam through a low-coherence-length broadband light source, and forming linearly polarized light through polarization modulation; focusing the light beam to the surface of the film through a confocal optical system; collecting reflection interference signals of the upper surface and the lower surface of the film; spatial filtering, low-coherence gating and polarization control are used for cooperatively inhibiting back scattering of the substrate. And processing the acquired interference signal, and calculating to obtain film thickness information. According to the invention, triple inhibition mechanisms are adopted for synergistic effect, and the method comprises the following steps: spatial filtering: shielding out-of-focus back reflected light through a confocal small hole; low-coherence gating: using a short coherence length to naturally suppress a reflected signal beyond a coherence range; and polarization control: further weakening stray light interference through polarization state matching, and effectively suppressing back scattering of the substrate.

Disclosed herein are an apparatus and method for mutual authentication of quantum entities based on Measurement-Device-Independent Quantum Key Distribution (MDI-QKD). The method may include configuring a quantum input form based on an authentication key shared in advance with a counterpart entity, applying polarization modulation to the configured quantum input form, transmitting the quantum input form to which polarization modulation is applied to a quantum measurement device, and authenticating the counterpart entity by checking whether the counterpart entity configures a quantum input form according to the shared authentication key using a measurement result and information about polarization modulation.

The invention belongs to the technical field of laser radars, and discloses a water surface reflected light suppression method and system in laser radar water level measurement, and the method comprises the steps: employing a multispectral fusion and dynamic polarization modulation technology, precisely filtering the interference of water surface reflected light, matching with a time-frequency domain combined filtering algorithm, and deeply analyzing signal features. An intelligent environment sensing mechanism monitors environment changes in real time, a machine learning model accurately predicts the trend of reflected light, system parameters such as laser transmitting power and receiving end gain are adjusted in advance, measurement errors are reduced, the water level measurement precision of the laser radar is greatly improved, and the water level measurement precision of the laser radar is greatly improved. The system reliability and stability are remarkably enhanced, the scheme is excellent in performance under severe conditions such as strong light by means of the capability of dynamically adapting to complex environment changes, the modular design of the system facilitates integration with an existing laser radar system, expansibility and compatibility are good, and the system can quickly adapt to equipment of different specifications and models.

The invention belongs to the field of ultrafast laser design and hyperspectral imaging, and provides an active spectrum modulation ultrafast laser and a hyperspectral detection system and method thereof, and the technical scheme is that the active spectrum modulation ultrafast laser comprises an ultrafast pulse laser, a primary polarization modulation module, a nonlinear broadening module and a secondary polarization modulation module; narrow-spectrum pulse laser emitted by the ultrafast pulse laser enters the nonlinear broadening module to be subjected to spectrum broadening to obtain wide-spectrum pulse laser after being subjected to preliminary modulation of the polarization state of laser of all wave bands through the preliminary modulation module, and the wide-spectrum pulse laser emitted by the nonlinear broadening module enters the secondary polarization modulation module to be subjected to spectrum broadening to obtain wide-spectrum pulse laser. And after randomizing the polarization state of each spectrum, irradiating the spectrums to a target scene. After the spectrum is modulated, the camera is controlled to collect the reflectivity intensity information of the target scene, and after irradiation and image collection of multiple groups of selected spectrum structures are completed, hyperspectral detection of the target scene is achieved in combination with the measured spectrum distribution and the corresponding reflectivity information.

The invention provides a Fe3O4 nano-particle microscopic imaging detection method based on left-handed and right-handed polarization modulation, belongs to the technical field of photo-thermal science and detection and signal processing, and solves the problems that at present, nano single particles are difficult to observe, and the physicochemical characteristics are difficult to obtain, the method specifically comprises the steps that a to-be-detected sample is determined, and a slide sample is prepared; starting a computer, a data acquisition card, a lock-in amplifier, a galvanometer controller and a function generator; starting an exciting light and probe light laser power supply and a refrigerator; detection parameters, laser power / current parameters and modulation parameters are set, and scanning detection is conducted on the detection sample piece; loading a magnetic field; the computer reads a signal from the data acquisition card to obtain a photo-thermal detection result image; different laser parameters and magnetic field sizes are changed, the steps are repeated, circular dichroism and magnetic circular dichroism detection results are obtained, magnetization curve measurement is carried out, and the single nanoparticle magnetic moment overturning process is monitored.

The invention relates to the technical field of optical precision measurement, in particular to an ultra-high time resolution camera time characteristic detection device and method, and the device comprises a laser source which is used for generating pulse laser; the polarization modulation element is arranged on an emergent light path of the laser source and is used for modulating the pulse laser into circularly polarized light; the spectroscope is arranged on an emergent light path of the polarization modulation element and is used for decomposing the circularly polarized light into a first linearly polarized light beam and a second linearly polarized light beam; the first optical path unit is used for guiding the first linearly polarized light beam to the cylindrical optical element along a fixed optical path; the second optical path unit is used for adjusting the optical path of the second linearly polarized light beam and guiding the second linearly polarized light beam to the cylindrical optical element; and the cylindrical optical element is used for receiving the first linearly polarized light beam and the second linearly polarized light beam and respectively projecting the first linearly polarized light beam and the second linearly polarized light beam to an imaging surface of a camera to be detected to form two spatially separated light spots. The objective of the invention is to improve camera time characteristic calibration precision and efficiency.

The invention discloses a VO2-based polarization modulator, a polarization characteristic analysis method and a modulation method, and belongs to the field of optical devices, the VO2-based polarization modulator comprises a metal substrate layer, a Si dielectric layer and a metasurface unit periodically arranged at the top end of the Si dielectric layer, and the metasurface unit is of a chiral structure formed by compounding VO2 and metal; each metasurface unit comprises a middle structure composed of a first middle metal frame and a second middle metal frame and side metal strips arranged on the two sides of the middle structure, and VO2 is embedded in the middle positions of the opposite sides of the first middle metal frame and the second middle metal frame. Metal protrusions are connected to the middle positions of the opposite sides of the first middle metal frame and the second middle metal frame. By adopting the VO2-based polarization modulator, the polarization characteristic analysis method and the modulation method, the polarization state of incident light can be adjusted by the metasurface by adjusting the conductivity of vanadium dioxide, and a dynamic tunable function is realized.

The invention relates to the technical field of semiconductor manufacturing and detection, and discloses a glass wafer through hole three-dimensional shape detection system based on machine vision, and the system comprises a multi-angle light source cooperation illumination module which is used for achieving the comprehensive illumination of a glass wafer through hole; the polarization modulation module is used for enhancing weak scattering signals and acquiring scattering field information with a high signal-to-noise ratio; the high numerical aperture optical module is used for collecting scattered field data; the Fourier diffraction region inverse scattering reconstruction module is used for realizing preliminary reconstruction of three-dimensional defect distribution; the compressed sensing iterative optimization module is used for improving the three-dimensional reconstruction precision and obtaining accurate three-dimensional defect distribution of the side wall of the through hole of the glass wafer; according to the invention, the diffraction limit of traditional optical detection is broken through, and surface and internal defects can be simultaneously detected and distinguished.

The invention discloses a calibration method of a polarization focal plane imaging system and an imaging system, relates to the field of photoelectric imaging and remote sensing detection imaging, and solves the problems of low correction efficiency and difficulty in correcting a system with a changed polarization state in the conventional polarization error correction technology. According to the calibration method, a plurality of coding patterns and corresponding polarization modulation matrixes are obtained based on the collected uniform light field and serve as calibration results. The polarization error correction method comprises the steps of obtaining an observation intensity vector based on a target scene; a corresponding polarization modulation matrix is obtained based on the coding pattern according to a coding polarization modulation matrix lookup table, and then a down-sampling Stokes vector after polarization error correction is obtained; and completing the correction of the polarization error through an imaging reconstruction method. A polarization focal plane imaging system comprises an imaging lens, a DMD digital micromirror array coding module, a focal plane DoFP polarization detector and an imaging reconstruction module. The method is suitable for the fields of remote sensing detection, target identification, environment monitoring and the like.

The invention discloses a snapshot Mueller matrix polarization imaging device and method based on a photo-oriented liquid crystal chip. The device comprises a light source unit, a polarization modulation unit based on the photo-alignment liquid crystal chip, a sample measurement unit, a polarization demodulation unit based on the photo-alignment liquid crystal chip, a light detector unit and a computer. According to the invention, the light source unit and the polarization modulation unit generate polarized light which is distributed in a specific mode in a space in a polarization state, the polarized light generates signal light after acting similarly, and after the signal light passes through the polarization demodulation unit, the signal light can be subjected to one-time photographing exposure through the light detector to acquire a signal image. And calculating the spatial distribution of all Mueller matrix elements of the to-be-detected sample through a computer. Measurement can be completed only through single exposure of the light detector, and the measurement speed is high; meanwhile, mechanical rotating elements, electric adjustable elements and the like are not needed, and the structure is simple and compact; the device has the advantages of high spatial resolution, high measurement precision and low manufacturing cost.

The invention provides a light field three-dimensional reconstruction method and system based on a microlens array and polarization modulation, and a medium, and the method comprises the steps: carrying out the polarization coding of light rays at different angles at an exposure moment based on a polarization modulator, and obtaining different polarized light information; focusing light to an imaging surface based on an imaging lens, and recording view images of different polarized light information based on a micro-lens array; based on the polarization characteristics of the view angle image, view angle decoding is carried out on the view angle image based on the polarization characteristics, and light field images of multiple view angles are obtained; preprocessing the light field images of the multiple visual angles to obtain preprocessed images of the multiple visual angles; analyzing the light intensity distribution information based on the preprocessed image to obtain light field data, and reconstructing the light field image based on a reflective projection algorithm to obtain a reconstructed image; multi-view image capturing is achieved through multi-state polarization coding, light intensity analysis is conducted on multi-view light field images, three-dimensional reconstruction of a high-speed dynamic scene is achieved, and the image reconstruction precision is improved.

The invention relates to the technical field of nonvolatile memories, in particular to a 2T1FC ferroelectric memory cell with a memory gate line and a preparation method of the 2T1FC ferroelectric memory cell. The 2T1FC ferroelectric storage unit with the storage gate line comprises a ferroelectric capacitor and a storage transistor which realizes read-write operation of data through polarization modulation of the ferroelectric capacitor; the control transistor is used for enabling a bit line to perform gating access; and the storage gate line is used for controlling the gate of the storage transistor and improving the holding capability of the written data. According to the invention, the special storage gate line is used, so that self-charge dissipation after writing is prevented, and the non-volatility is enhanced; separation of the storage path and the control path minimizes accidental flipping in the read / write cycle; the service life of the device is prolonged by lower write-in current stress and an isolated gate structure; low-voltage writing with high retentivity can be realized, and the method is suitable for energy-limited edge AI equipment.

The invention relates to Device for quantum generation of random numbers comprising a light source (100) with fixed polarization and a polarization splitting element (110) optically connected thereto, having a first output (111) corresponding to vertical polarization and a second output (112) corresponding to horizontal polarization, and a first detector (131) optically connected to the first output (111) of the polarization splitting element (110) and a second detector (132) optically connected to the second output (112) of the polarization splitting element (110), a generating module (140) having a first input (141) connected to the output of the first detector (131) and a second input (142) connected to the output of the second detector (132), and a two-state output (143), the generating module (140) configured to generate on the two-state output (143) bits having a value of 1 upon receiving a signal on the first input (141) and bits having a value of 0 upon receiving a signal on the second input (142), characterized in that the light source (100) is connected to the polarization splitting element (110) via a multi-state polarization modulator (150) controlled by a digital or analog signal generated by a control electronics (160) connected to the multi-state polarization modulator (150).The invention comprises also a method for verification of privacy of random bit sequences generated by means of such a device.

The invention provides a dual complementary dynamic convolution optimization method and system for underwater robot image processing, and the method comprises the steps: enabling a polarization laser light source to excite a multi-band orthogonal polarized light sequence in an underwater robot, and receiving a reflected light signal containing suspended matter scattering polarization characteristics, operation target surface reflected light polarization modulation characteristics and water body transmission attenuation spectrum characteristics. An operation target reflection main signal frequency band and a suspended matter scattering harmonic interference frequency band are extracted through a noise separation chip, and the frequency bands are input into a dual complementary dynamic convolution optimization network to generate an adaptive enhancement feature map linked with an operation target space coordinate. And by combining the suspended matter scattering harmonic interference frequency band and the water body transmission attenuation spectrum feature optimization feature map, mechanical arm track correction parameters and propeller disturbance compensation coefficients are generated, and accurate control over the motion track of the underwater robot is achieved. The target detection precision and the motion control stability of the underwater robot are improved.

The invention discloses a stress regulation-based micro spectrometer system of a transparent polymer material. The system comprises a polarization modulation unit, a transparent polymer layer, an imaging detector and a spectrum reconstruction module. The transparent polymer material is stretched by a specific design and then is arranged between the two polarizing films of the polarization modulation unit, and the imaging detector chip is arranged at the bottom layer of the device. And the spectrum reconstruction module performs spectrum reconstruction on the data received by the imaging detector by applying a calculation spectrum reconstruction algorithm to restore the original spectrum data received by the whole device. According to the technical scheme, a new spectrum detection thought is provided, and high-resolution spectrum analysis can be carried out in each wave band while the size of a miniature device is ensured by adjusting the applicable wave band of each component.

The invention discloses an atom magnetometer device and method based on detection light frequency detuning amount modulation. Red and blue detuning linear polarization modulation light is used as detection light to realize modulation of an optical rotation angle of an atom magnetometer. Under the condition that the optical power of the modulated light is kept unchanged, the frequency of the modulated light is subjected to red detuning and blue detuning conversion with the same detuning amount relative to the resonance frequency of the alkali metal atom D1 line, so that the rotation angle is quickly switched between positive deflection and negative deflection, the modulation of the rotation angle is realized, and the modulation efficiency is improved. And the modulated optical rotation angle signal is subjected to polarization differential detection and phase-locked amplification technologies to obtain a magnetometer output signal containing to-be-detected magnetic field information. Compared with a conventional atom magnetometer modulation method, the method has the advantages that the modulation of the optical rotation angle is indirectly realized by carrying out red and blue detuning modulation on the detection light, the introduction of a modulation magnetic field is avoided, the optical power noise is suppressed, the low-frequency noise is isolated, and compared with an unmodulated mode, the amplitude of the optical rotation angle is enhanced, and the sensitivity of the magnetometer is improved.

The invention provides an acoustic signal detection system based on an echo wall mode microcavity acoustic sensor. The acoustic signal detection system can be applied to the technical field of acoustic signal sensing and detection. The acoustic signal detection system comprises an echo wall mode microcavity acoustic sensor used for performing amplitude and phase modulation on predetermined polarization modulation light to obtain output light under the condition that an external acoustic signal acts on the echo wall mode microcavity acoustic sensor and the predetermined polarization modulation light passes through the echo wall mode microcavity acoustic sensor; the detection unit is used for performing coherent processing on the output light based on the predetermined reference light to obtain two paths of target signals, and the two paths of target signals are related to the target transmission amount and the target phase amount; the processor is used for analyzing the two paths of target signals to obtain target transmission quantity and target phase quantity; and according to the target transmission amount, the target phase amount and a plurality of first target formulas, an external sound signal is obtained, and the plurality of first target formulas represent the incidence relation between the target transmission amount and the external signal and the incidence relation between the target phase amount and the external signal.