483 results about "Heterodyne" patented technology

The invention belongs to the technical field of industrial measurement, and discloses a pump machine metal shell size detection method based on image analysis, which comprises the following steps: synchronously acquiring image data of a pump machine metal shell in a visible light wave band and a near-infrared wave band; the contrast ratio of image data is optimized through a dynamic exposure control technology, and a high-dynamic-range multispectral image is obtained; three-dimensional geometric information of the pump machine metal shell is obtained, registration fusion is carried out on the three-dimensional geometric information and the high-dynamic-range multispectral image, a dense three-dimensional point cloud model with multispectral textures is constructed, and a multi-frequency heterodyne algorithm is adopted to process a high-reflection area in the dense three-dimensional point cloud model; the method comprises the following steps: collecting a multi-angle reflection image of a pump machine metal shell by rotating a linear polarizer, calculating a Stokes vector to extract a diffuse reflection component, carrying out diffuse reflection component constraint and brightness suppression on a high-reflection area based on a CIE-Lab color space, and outputting a dense three-dimensional point cloud model after texture enhancement; and the size detection precision of the pump machine metal shell is improved.

The invention discloses a defect detection method for a high-reflection battery aluminum shell, which comprises the following steps of: generating sine stripes required by a light source by using computer coding, respectively projecting the sine stripes in x and y directions to the surface of the aluminum shell to be detected through an LCD (Liquid Crystal Display) screen, and acquiring 16 deformed stripe patterns by using a CCD (Charge Coupled Device) camera; drawing a gray value curve of the stripe pattern to obtain a minimum enclosing rectangle of an area where the surface of the to-be-detected aluminum shell is located, and extracting all the surface of the to-be-detected aluminum shell; performing phase extraction and unwrapping on the extracted deformed stripes on the surface of the to-be-detected aluminum shell by using a multi-frequency heterodyne method to obtain a matrix containing phase information in x and y directions; according to the positions of pixel points which are suddenly changed in the phase information, a reflectivity model is used for estimating defect information of the surface of the aluminum shell to be detected, a reflectivity defect graph is generated, gradient information is calculated according to the phase information, and a curvature graph is obtained according to the gradient information and the curvature relation to obtain a clear defect picture.

A metrology system including a heterodyne light source is provided. The heterodyne light source includes a first light source, an acousto-optic modulator and a source optical arrangement. The acousto-optic modulator receives at least one wavelength laser beam from the first light source and generates at least one corresponding frequency shifted laser beam (e.g., with orthogonal polarization). The source optical arrangement includes a receiving optical element portion and a birefringent optical element portion. The receiving optical element portion receives the wavelength laser beam(s) and the corresponding frequency shifted laser beam(s) and directs the beams along an optical path toward the birefringent optical element portion. The birefringent optical element portion combines the beams to output a combined beam (e.g., which may be utilized as part of a measurement process to determine at least one measurement distance to at least one surface point on a workpiece, etc.).

The invention relates to the technical field of spectrum detection, and particularly provides a passive laser heterodyne double-balance spectrum detection method and device, and the method comprises the steps: carrying out the frequency mixing and differential processing of an input narrow-linewidth laser local oscillator signal and a wide-spectrum incoherent target optical signal through employing an optical mixer and a photodiode, and obtaining a laser heterodyne double-balance spectrum. Two paths of random time beat frequency photocurrent signals with the phase difference of 90 degrees are generated, the random time beat frequency photocurrent signals comprise information such as the spectrum of signal light, and the spectrum information of the signal light can be recovered by processing the output photocurrent signals through methods such as filtering and integration. The narrow linewidth and wavelength tunable characteristics of the narrow linewidth laser local oscillation signal can be utilized to perform high spectral resolution information acquisition on the wide spectrum incoherent optical signal, the utilization efficiency of the local oscillation light is effectively improved, common mode noise and part of system noise are eliminated, and the signal-to-noise ratio of the output signal is enhanced.

The invention relates to the technical field of laser ranging, in particular to a double-optical-comb hybrid ranging device which comprises a signal detection optical path system and a signal demodulation optical path system. Wherein the signal detection optical path system comprises a first optical frequency comb, a first optical isolator, a first optical collimator, a first beam splitter prism, a reference mirror, a Faraday rotator, a convergence mirror and a target reflector; the signal demodulation optical path system comprises a second optical frequency comb, a second optical isolator, a second optical collimator, a half-wave plate, a second beam splitter prism, a third beam splitter prism, a first polarization controller, a first photoelectric detector, a reflector, a polarization beam splitter prism, a second polarization controller and a second photoelectric detector. A third polarization controller; and a third photoelectric detector. According to the invention, three ranging technologies of asynchronous optical sampling ranging, multi-heterodyne interference ranging and synthetic wavelength ranging are fused, and the problem that a large ranging range and high ranging precision cannot be simultaneously considered in the ranging process is solved.

The invention relates to a multi-degree-of-freedom motion synchronous measurement system and method based on time-space domain information fusion, which utilize a heterodyne interference phenomenon generated by a double-frequency light source to realize accurate measurement of displacement and angle by analyzing phase change of an interference signal generated by interaction of a measurement grating and a reference grating. The system comprises a double-frequency light source, an optical element, a measuring grating, a reference grating and a photoelectric detector, and the photoelectric detector comprises an array detector and a common photoelectric detector and is used for receiving interference light signals of different diffraction orders. The processing device at least comprises an angle measuring module. The angle module is used for resolving by fusing phase spatial-temporal characteristics and light spot displacement of signals on the array detector; a displacement module can be further included, calculation is carried out through the phase change of heterodyne interference signals on the detector along with time, and finally synchronous measurement of six-degree-of-freedom motion parameters can be achieved. The system has the advantages of being accurate, compact in size, high in light source efficiency and the like, and is suitable for multiple fields of photoetching machine wafer table positioning, ultra-precision machine tool machining and the like.

The invention belongs to the technical field of computer vision and optical measurement, and discloses a three-dimensional reconstruction method and device based on multi-frequency fringe synchronous optimization and a medium, and the method comprises the following steps: based on a monocular structured light system, projecting a plurality of groups of sine fringe images with different frequencies to the surface of an object to be measured through a projector, and carrying out the stepping of a plurality of phases, acquiring a corresponding image sequence by using a camera; using a structured light phase shift method to obtain a relative phase value of a pixel point; obtaining an initial absolute phase value and modulation intensity based on a structured light phase shift method and a multi-frequency heterodyne method; and carrying out joint optimization on the absolute phase and modulation intensity parameters of the multi-frequency fringes through a Gaussian-Newton iteration method. According to the method, the anti-noise capability and the reconstruction precision are improved, a parameter adjustment and threshold recovery mechanism is introduced in the optimization process, the convergence stability and abnormal value elimination are ensured, and the method is suitable for high-precision structured light application scenes such as industrial vision measurement and complex surface detection.

The invention provides a non-power-cut test method for mutual inductance parameters of a power transmission line under excitation of different-frequency signals and a related device, and solves the problems of difficulty in accompanying stop and high safety risk of adjacent lines. The method comprises the following steps: selecting one circuit in the same corridor for power failure, connecting the head end with an induced electricity suppression device, and performing three-phase short-circuit grounding at the tail end; injecting a different-frequency sinusoidal current of 45-55Hz into the power failure line; the synchronous measurement device collects head and tail voltage and current of a running line based on a satellite synchronous clock; extracting pilot frequency signals through two-stage notch filtering and Fourier transform; and different-frequency zero-sequence self-impedance and mutual impedance are calculated and converted into power-frequency impedance. According to the invention, accurate test without power failure can be realized, and safety and power supply reliability are guaranteed.

The invention discloses a cultural relic restoration decision-making method and system based on computer three-dimensional modeling, and relates to the technical field of cultural relic restoration, and the method comprises the following steps: building a unified time baseline, generating a phase reference field, introducing a double-frequency comb interference structure to reconstruct a humidity refraction field, locking a zero-phase anchor point, and forming an initial constraint condition of a scanning path; under an initial constraint condition, an airflow phase gradient is obtained by adopting a Schlenn pilot frequency chromatography method, a nonlinear diffraction nucleus is calculated, and a refraction residual spectrum is output for modeling correction. According to the method, humidity disturbance is recognized through interference measurement and chromatography, real-time compensation is achieved in combination with phase sheath and humidity control, the crack and material characteristics are fused through neural field modeling, the solidification process is played back in combination with a mineralization mechanism, and the three-dimensional modeling precision and the restoration decision scientificity are improved.

A high-resolution phase detection method and system based on a plane grating laser interferometer. The method uses a dual-frequency interferometer to measure the displacement, and the measurement signal processing comprises an integral part and a decimal portion, a phase equation set of a displacement measurement signal is constructed according to a measurement optical path principle of a heterodyne plane grating laser interferometer; a non-linear equation set for which the unknowns are instantaneous phase, interval phase and signal amplitude is established; and the equation sets above are solved by using the least squares method, so as to realize phase discrimination, thereby realizing precise displacement measurement. The method can solve the problems in the traditional time measurement-based phase detection technology, such as low measurement accuracy, and failing to satisfy small measuring range measurement. The measurement method can be applied to systems such as precision manufacturing equipment and lithography machine.

The invention discloses a laser radar range resolution improving device and method based on wavelength division multiplexing, and belongs to the field of laser radar system design and data processing.According to the wavelength division multiplexing principle, multi-wavelength laser signals are emitted, processed and output through a signal modulation module after wavelength division multiplexing, and then a plurality of linear frequency modulation signals are output; in a direct acquisition mode, heterodyne receiving is carried out on the demultiplexed signal, an imaging result of an equivalent large modulation bandwidth signal can be obtained through signal processing, and the method can be used for a laser radar system for high-precision distance measurement. Compared with a traditional single-wavelength laser radar structure, the limitation of the modulation bandwidth of an electro-optical modulator can be broken through, and the emission signal bandwidth is multiplied, so that the range resolution of the laser radar is greatly improved, and the imaging quality of a target object is better; meanwhile, the sampling rate requirement of each channel in a direct sampling mode can be reduced, and the problem that a high-bandwidth signal cannot be collected due to an AD rate bottleneck existing in a direct sampling condition is solved.

The invention discloses an in-phase and quadrature demodulation phase modulation optical heterodyne frequency stabilization system for inhibiting an RAM (Random Access Memory), which relates to the technical field of laser frequency stabilization and comprises a laser, an electro-optical modulator, a circulator, an optical resonant cavity, a photoelectric detector, a phase shifter, a frequency mixer, a summator, a low-pass filter, a signal generator and a signal acquisition and processing module. Laser emitted by the laser is modulated by the electro-optical modulator and then enters the circulator, the circulator receives reflected light of the optical resonant cavity and emits the reflected light to the photoelectric detector, and all error signals are obtained through the frequency mixer and the low-pass filter. All error signals are added through an adder and then are input into a signal acquisition and processing module for feedback, so that the frequency of laser emitted by the laser is locked to the resonant frequency of the optical resonant cavity; according to the frequency stabilization system, a plurality of modulation frequencies are introduced to modulate the laser phase in the electro-optical modulator, so that the influence of RAM noise on frequency stabilization is suppressed.

The invention provides a distributed optical fiber sensing integrated system and an implementation method, the system comprises a sending end, a sensing receiving end, a communication receiving end and a transmission link unit, the sending end is used for generating an LFM-PSK sensing integrated optical signal and a path of LFM optical signal; the sensing receiving end is used for carrying out matched filtering on the LFM-PSK sensing integrated optical signal and a Rayleigh scattering signal returned by the transmission link unit so as to detect and analyze the change of phase information of a transmission optical fiber; and the communication receiving end is used for performing heterodyne correlation detection on the LFM-PSK sensing integrated optical signal and the other path of LFM optical signal so as to restore a PSK communication signal, and then acquiring the original service signal based on the PSK communication signal. Compared with the prior art, the system has the advantages that the signal-to-noise ratio of a sensed signal in a strong noise interference environment is higher, and the sensing performance is better.

The invention relates to the technical field of optical imaging, and discloses a single-pixel color imaging system based on multi-wavelength radio frequency marking. The system comprises a light source module used for generating three laser beams with three optical primary colors; the radio frequency driving module is used for generating a radio frequency complex frequency signal; the light path adjusting module is used for performing heterodyne interference processing on the three laser beams according to the radio frequency complex frequency signal, respectively forming a light spot array and a reference light source and then combining the beams, and generating a combined beam to be incident on a measured target; each laser beam corresponds to one group of sub light spot arrays; sub light spot arrays with aligned spatial positions exist among the three groups of sub light spot arrays; the detected target detection module is used for collecting light data generated after a detected target reflects the combined light beam; and the image inversion module is used for performing image inversion processing on the optical data to generate a true color image of the measured target. According to the system, the light spot array of multi-wavelength laser incidence can be registered in the spatial position.

A method and apparatus for an angle meter cooperatively using two or more non-contact distance meters for measuring distances to a surface along substantially parallel lines. The measured distances are used for estimating or calculating the angle to the surface and the distance to the surface. The distance meters may use optical means, where a visible or non-visible light or laser beam is emitted and received, acoustical means, where an audible or ultrasound sound is emitted and received, or an electro-magnetic scheme, where radar beam is transmitted and received. The distances may be estimated using a Time-of-Flight (TOF), homodyne or heterodyne phase detection schemes. The distance meters may share the same correlator, signal conditioning circuits, or the same sensor. Two or more angle meters may be used defining parallel or perpendicular measurement planes, for measuring angles between surfaces, and for estimating physical dimensions such as length, area or volume.

A zero-optical-path-difference double-frequency heterodyne grating ruler comprises a light source, a signal detecting and processing system, a polarization splitting prism, a first quarter-wave plate, a rectangular prism, a second quarter-wave plate, a third quarter-wave plate, a total reflection mirror, a long-strip prism, a reference grating and a 45-degree-placed polaroid. The two measuring light paths of the system always keep zero optical path difference, so that the measuring precision can be ensured, and the environmental stability of the system is also remarkably improved. And a high-precision and high-robustness measurement scheme is provided for precision equipment such as a photoetching machine and a precision motion platform.

The invention relates to a prism type heterodyne spectrometer with a fixed localization plane, and belongs to the technical field of spectrometers. The problem that the position of an interference fringe localization plane changes along with the wavelength in the prism type spatial heterodyne spectrum technology in the prior art is solved. The invention discloses a prism type heterodyne spectrometer with a fixed localization plane. The prism type heterodyne spectrometer comprises a beam splitting optical element, a first prism, a first reflection optical element, a first plane mirror, a first tuning rotating shaft, a second prism, a second reflection optical element, a second plane mirror, a second tuning rotating shaft, an imaging optical element and a first detector. According to the prism type heterodyne spectrometer with the fixed localized plane, spatial heterodyne is constructed in a form of a prism, a reflection optical element and a plane mirror, and the localized plane of interference fringes is fixed. And the working spectral range of the instrument can be enlarged by rotating the optical element, so that the spectrum can be tuned, and the position of the localized surface can still be kept unchanged.

The invention relates to an uncertainty propagation evaluation method in spatial heterodyne spectral measurement, and belongs to the technical field of hyper-spectral remote sensing detection. The entrance pupil radiance spectral data # imgabs0 # and the output signal # imgabs1 # of the spatial heterodyne spectral measurement system are calculated; the uncertainty # imgabs2 # of the atmospheric parameters is calculated; the uncertainty # imgabs3 # of the signal electron number and the uncertainty # imgabs4 # of the noise are calculated; according to the uncertainty # imgabs5 # of the atmospheric parameters, the uncertainty # imgabs6 # of the signal electron number and the uncertainty # imgabs7 # of the noise, the uncertainty # imgabs8 # of the output signal of the spatial heterodyne spectral measurement system is calculated; the uncertain component of the uncertainty # imgabs9 # is analyzed; sorting influence contributions generated by the uncertain components; the method solves the problems that the design indexes of the spatial heterodyne spectral measurement system cannot quantitatively describe the measurement precision of the radiation energy, the entrance pupil radiance signal and the output signal, and the uncertainty contribution introduced by the spatial heterodyne spectral measurement link.

The invention discloses an uninterrupted calibration method and device for a medium and low voltage current transformer and a medium. The method comprises the following steps: measuring a primary side original current signal of a to-be-measured current transformer by using a pre-prepared mobile calibration platform; injecting a reverse current with the same frequency as the injection current source of the current transformer to be detected into the current transformer to be detected, and counteracting a primary side original current signal of the current transformer to be detected; generating a pilot frequency current according to a pre-selected pilot frequency signal by using an injection current source, inputting the pilot frequency current to a primary side of the current transformer to be detected for pilot frequency current calibration, and collecting a secondary side output signal; performing error analysis on the to-be-detected current transformer based on the secondary side output signal, and determining an error analysis result; and adjusting the calibration parameters of the to-be-detected current transformer based on the error analysis result to perform pilot frequency current calibration again until the error analysis result meets a preset requirement, and completing calibration of the to-be-detected current transformer.

The invention discloses a planetary atmospheric trace gas spectrum telemetering and in-situ fusion detection system and method, and belongs to the technical field of deep space exploration. The detection system has a telemetering mode and an in-situ detection mode, and comprises a telescope module, a laser light source module, a heterodyne spectrum telemetering module, an in-situ absorption spectrum module, a gas sampling and enriching module and a signal acquisition, processing and control module. In the on-orbit stage, a heterodyne spectrum telemetering module is adopted, and a laser light source and sunlight signals are subjected to frequency mixing for atmospheric component telemetering; and after the detector enters an atmospheric descending section, the in-situ absorption spectrum module performs in-situ absorption spectrum measurement by utilizing the detection light of the same laser light source. By performing space-time fusion and joint inversion on the data acquired in the two modes, coherent detection from large-range general survey to fixed-point detailed survey is realized, the problems of load separation of telemetering and in-situ detection and difficulty in data fusion are solved, and the detection efficiency, the data consistency and the integration level of the system are greatly improved.

To correct a measurement error of BFS by performing calculation of BFS on the basis of an extinction ratio of optical pulses.SOLUTION: An optical fiber sensor comprises: a light source section for generating probe light that is an optical pulse train; an optical coupler for branching probe light into two; an interference signal acquisition section for generating an interference signal by self-delay type heterodyne interference after rear Brillouin scattered light generated by an optical fiber measured by one probe light branched into two by an optical coupler is inputted; an extinction ratio measuring instrument for measuring an extinction ratio of the other probe light branched into two by the optical coupler; and signal processing means. The signal processing means includes: BFS calculation means for calculating a Brillouin frequency shift amount as a BFS measurement value from an interference signal; and extinction ratio correction means for correcting a BFS measurement value and obtaining a true BFS value on the basis of an extinction ratio measured by the extinction ratio measuring instrument.SELECTED DRAWING: Figure 1

The invention discloses an SERF atomic gyro signal detection device and method based on an optical heterodyne method, and belongs to the technical field of atomic polarization stability control, after magnetic fields with x-axis frequency and y-axis frequency are applied to atoms in a sensitive unit air chamber, x-axis electron polarizability information under respective modulation frequencies comprises longitudinal polarizability information and longitudinal magnetic field information, and x-axis electron polarizability information and y-axis electron polarizability information under respective modulation frequencies comprise longitudinal polarizability information and longitudinal magnetic field information; the value of the longitudinal polarizability is obtained by resolving information contained in the two, and effective longitudinal polarizability closed-loop control is achieved through a liquid crystal phase delayer power stabilizing rate system. Based on the biaxial magnetic field modulation technology, interference of longitudinal magnetic field fluctuation on polarizability closed-loop control is effectively avoided, and effective polarizability in-situ closed-loop control is achieved.

The invention discloses a narrow linewidth laser frequency control device and method based on optical feedback discretization, and belongs to the technical field of laser control. In order to solve the problems of poor frequency stability and tuning range of an existing laser, a laser beam emitted by the laser is incident to an optical feedback assembly to generate front-cavity mirror transmission light; the optical heterodyne feedback adjusting assembly demodulates an electric signal corresponding to the transmission light of the cavity front mirror to obtain an error signal, and transmits the error signal to the high-voltage amplification control module end to control the PZT, so that the high-voltage amplification control module end controls the PZT according to the error signal to lock the laser frequency on the cavity mode frequency; and meanwhile, the laser controller changes the working current of the laser, so that the laser frequency is locked on each intrinsic cavity mode frequency of the optical resonant cavity, and a series of discrete wide-range stable locking frequencies are obtained under the control of the temperature control module.

The invention discloses a distributed optical fiber two-dimensional vector sensing system and method, the system uses an acousto-optic modulator group and an optical circulator group to ask a plurality of fiber cores of a multi-core optical fiber in parallel, heterodyne coherent detection uses local oscillator light to improve the signal-to-noise ratio, and through the relation between the fiber core position difference and the direction angle of a two-dimensional sound wave in the aspect of algorithm, the two-dimensional sound wave direction angle is obtained. According to the space division multiplexing distributed optical fiber acoustic sensing system, a two-dimensional vector signal is accurately restored, the measurement vector angle range of the space division multiplexing distributed optical fiber acoustic sensing system for two-dimensional sound waves is 0-360 degrees, the vector sensing range is larger than 50 km and far exceeds that of an existing system, and the detection capacity of the distributed optical fiber acoustic sensing system is greatly improved.

The invention relates to a Rydberg atomic communication receiving system and method based on AT split peak value analysis, and belongs to the technical field of quantum communication. The system comprises a detection laser, a coupling laser, an AOM / EOM, a function generator, a high-frequency signal generator, a cesium atom gas chamber, a photoelectric detector, a lock-in amplifier, a data acquisition module and a microwave signal output module. The AOM / EOM modulates the frequency of the detection laser; the microwave signal output module generates an AM modulation microwave signal and transmits the AM modulation microwave signal to the cesium atom gas chamber, so that the target Rydberg state atoms generate an AT splitting effect to calibrate system parameters; the photoelectric detector and the lock-in amplifier obtain a first harmonic component based on the transmission light. During communication, the system is arranged in a microwave electric field received by communication, and the data acquisition and processing module outputs AM modulation microwave signals received by the recovered cesium atom gas chamber based on calibrated system parameters and phase locking. The method solves the problem of signal distortion existing in EIT-AT direct communication transmission and the problem of tedious operation of a heterodyne method.

The invention discloses a surface topography detection method and system based on double optical comb surface domain frequency sweeping, and relates to the technical field of surface topography detection. According to the method and the device, the frequency sweeping function of the double optical combs is realized by utilizing the area domain frequency sweeping, so that the double optical comb light source capable of realizing high-precision distance measurement can be applied to an interference light path to realize area array distance measurement. Therefore, double-optical-comb frequency sweeping is used for replacing traditional light source frequency sweeping, double-optical-comb multi-heterodyne interference is combined with surface domain frequency sweeping, the measurement precision of the longitudinal depth is greatly improved, then the precision of three-dimensional reconstruction based on the longitudinal depth is improved, the ultra-high resolution ratio which breaks through the micron level and reaches the sub-nanometer level is achieved, and actually, the measurement precision of the longitudinal depth is improved. The atomic-scale surface topography detection with the longitudinal resolution being less than or equal to 0.1 nm can be realized.

The invention discloses a heterodyne precision displacement measurement system based on a self-tracing grating, and belongs to the technical field of precision displacement measurement. Comprising a single-frequency laser module, a frequency shift module, a heterodyne displacement measurement module, a self-tracing grating and a signal processing module. The single-frequency laser module generates single-frequency laser, and the single-frequency laser passes through the frequency shift module to obtain two linearly polarized lights with different frequencies and mutually orthogonal polarization states to form a heterodyne light source. Heterodyne laser enters the self-tracing grating through the heterodyne displacement measurement module, diffracted light returns to the heterodyne displacement measurement module along an original light path, a measurement signal and a reference signal with displacement information are obtained, and finally the phase difference of the two signals is calculated through the signal processing module and displacement conversion is carried out. The ultra-precise displacement measurement system has high stability and resolution, displacement values are independently traced, and the ultra-precise displacement measurement system has the environmental interference resistance of a heterodyne grating interferometer and has the advantages of high measurement resolution, independent measurement results and reliable traceability.

The invention belongs to the field of wave energy power generation, and discloses a pilot-frequency floater wave energy device array structure optimization method, which comprises the following steps of: giving an input wave energy spectrum frequency band reconstruction division strategy by combining the technical attributes of a wave energy device; based on an energy obtaining spectrum theory, deducing full-band equivalent energy capture of the device, and clarifying energy obtaining contribution of the device in the array in each band; the input sea wave spectrum is used as the target spectrum, array configuration design is carried out, the matching condition of floaters in the array is determined, the accurate matching of the output level of the array and resources is realized, and the development and utilization efficiency of the array is improved. According to the method, factors such as the mass, the resonance bandwidth, the inherent frequency and applied PTO damping of the floater are comprehensively considered, the relation of influence factors is established, pilot frequency floater wave energy devices meeting the requirements under specific sea area conditions are efficiently found in a simple and rapid means, an array composed of the pilot frequency floater wave energy devices can absorb incident wave energy in a full-band mode, and the wave energy efficiency is improved. And the utilization rate of the wave energy is greatly improved.

The invention relates to a fringe projection high-reflection surface phase unwrapping method based on frequency reuse. The fringe projection high-reflection surface phase unwrapping method comprises the steps of collecting a multi-frequency fringe image and dividing the multi-frequency fringe image into an overexposure area and a non-overexposure area, solving a wrapped phase in the non-overexposure area by adopting a generalized phase shift method, obtaining an initial unwrapping phase based on a multi-frequency heterodyne algorithm, and performing block filtering and interpolation processing to obtain a fringe projection high-reflection surface phase unwrapping phase. A continuous unwrapped phase containing a high-reflection area is obtained, a complementary Gray code consistent with a wrapped phase period is constructed in combination with a multi-threshold constraint and is used for correcting the stripe level of an overexposure area, brightness attenuation design is further carried out on low and medium frequency stripes, frequency reuse is achieved, and the high-reflection area is obtained. Obtaining an unwrapped phase of an overexposure point in a non-high-frequency stripe and mapping the unwrapped phase to a high frequency; the method comprises the following steps of: extracting and fusing a wrapped phase by adopting one-dimensional Fourier and Hilbert transform for areas with overexposure of each frequency, and selecting and inhibiting spectrum leakage through a complete period, so that effective correction of the wrapped phase and stripe level of an overexposure point is realized, and a reliable unwrapped phase is obtained.

The invention discloses a laser Doppler heterodyne noninvasive blood glucose concentration measuring device and method, and belongs to the technical field of medical detection. Comprising a laser generating module which comprises a laser, and a first 1 / 2 wave plate and a polarization splitting prism which are sequentially connected with the laser; and the interference light path module is connected to the two sides of the polarization splitting prism respectively and comprises a first optical fiber coupler connected with the polarization splitting prism, and a second 1 / 2 wave plate and a second optical fiber coupler which are sequentially connected with the other side of the polarization splitting prism. The device has the advantages that noninvasive detection can be achieved, blood sampling wounds are avoided, and the comfort level of a patient is improved; the measurement precision is high, and the blood glucose value can be quickly and accurately obtained by using heterodyne interference and frequency shift technologies.