2579 results about "Optical pathlength" patented technology

The invention discloses a solar cell and a photovoltaic module. Wherein the semiconductor substrate comprises a first surface and a second surface which are opposite to each other, and a side surface connected with the first surface and the second surface; in the direction from the first face to the second face, the side face comprises a first area and a second area which are sequentially arranged, the first area is provided with a first texture structure, and the second area is provided with a second texture structure. The first texture structure and the second texture structure can enable light incident to the side face to be reflected and refracted for multiple times, the advancing direction of the incident light on the side face of the semiconductor substrate is changed, the optical path is prolonged, the light trapping effect is generated, and generation of photon-generated carriers is increased, so that when the side face of the semiconductor substrate is provided with the first texture structure and the second texture structure, the light trapping effect is improved. More light rays can be absorbed and utilized by the side surface of the semiconductor substrate, and the photoelectric conversion efficiency of the solar cell can be improved.

The invention discloses a heat shrink tube detection method based on image recognition, particularly relates to the technical field of electric power material defect detection, and is used for solving the problems of defect contour distortion, positioning deviation and insufficient classification precision caused by optical ghost interference in heat shrink tube detection. A mapping relation of light refraction paths is established based on brightness gradient difference and refractive index difference, theoretical ghost interference fringes are generated by dynamically adjusting optical path difference of an interferometer, and abnormal areas deviating from theoretical distribution are screened; meanwhile, light source incident angle optimization and defect displacement calculation are combined, residual ghost interference is eliminated, finally, accurate classification and positioning of defects are achieved through multi-dimensional matching of geometric parameters and historical defect data, complex algorithm dependence is reduced while the detection precision is improved, and the real-time detection requirement of an industrial production line is met.

The invention discloses a vehicle-mounted holder laser telemetering scanning type gas leakage positioning system, and relates to the technical field of gas leakage monitoring. The vehicle-mounted pan-tilt laser telemetering scanning type gas leakage positioning system comprises a data acquisition unit for acquiring laser absorption second harmonic signal intensity of an inspection vehicle on a set route; the concentration inversion processing unit is used for inverting the gas concentration on the basis of the signal; the concentration analysis unit is used for identifying an abnormal inspection point by comparing the concentration change rate; the leakage direction analysis unit is used for predicting the leakage direction by combining wind direction concentration data; according to the invention, a signal saturation upper limit value and an optical path length value are introduced to carry out normalization processing, concentration inversion calibration is carried out in combination with a gas absorption coefficient, independent calculation is carried out at each inspection position point, and the accuracy of the inspection is greatly improved by combining remote measurement concentration distribution data, image data and a leakage position analysis unit for accurately positioning a leakage point in combination with a gas diffusion model. And continuous, dynamic and high-precision concentration distribution reconstruction in space is realized.

The invention discloses a detection and analysis system for an oil-controlling and soothing extract, particularly relates to the field of extract detection, is used for solving the problem of accurate quantitative analysis of complex components, and is characterized in that omnibearing characteristics of a sample are synchronously acquired and captured through multiple spectrums, and the information is fused into a high-dimensional data framework, so that the limitation of a single spectrum is avoided; thirdly, noise is removed through accurate calibration, sparse decomposition and cross-modal verification are combined, and it is ensured that extracted component signals truly reflect chemical characteristics and are not covered by redundant interference; on the basis, a clear signal of a target active component is further separated by utilizing dynamic convolution and an attention mechanism, and irrelevant background influence is eliminated; finally, through segmented modeling and geometric constraint, absorbance change is accurately converted into concentration data, and the concentration data can be kept stable even under the background fluctuation or nonlinear condition, so that the quantitative inversion error of the active component is reduced under the scene of background signal fluctuation or non-uniform optical path, and the accuracy of a determination result is improved.

The invention relates to the cross technical field of atmospheric science and communication technology, in particular to an atmospheric refraction and waveguide environmental parameter detection and prediction method and device, and the method comprises the following steps: carrying out the power distribution of a light beam of a broadband light source through employing a light splitting element based on the emission of the broadband light source, and forming a detection light beam and a reference light beam, and guiding the detection light beam to pass through a preset open atmosphere optical path, and guiding the reference light beam to pass through a known refractive index stabilizing medium or a vacuum pipeline. The detection light beam and the reference light beam are formed through light splitting of the broadband light source, the detection light beam penetrates through the open atmosphere path, the reference light beam passes through the stable medium, Fourier transform is carried out on interference signals of the two light beams to extract wavelength phase difference mapping data, and tiny optical path change caused by atmospheric refractive index disturbance can be captured. Compared with the traditional single-point or single-path measurement, the sensing sensitivity and the measurement dimension of the atmospheric refractive index spatial nonuniformity are improved by using the broadband spectral information.

The invention provides a container multi-angle imaging quality detection method and system, and the method comprises the steps: carrying out the illumination and imaging of a target container from a plurality of preset visual angles through employing light sources with different wavelengths, and obtaining a refraction displacement fingerprint data set; carrying out regional division on the surface of the container according to the data set, calculating the refraction influence degree of each region under different visual angles, and generating a regional visual angle weight distribution diagram; performing optical path reverse tracking processing on the images acquired at each view angle by using the distribution map, constructing a light propagation path model, and performing position mapping and distortion compensation to obtain a corrected image; and finally, according to the corrected image and the regional view angle weight distribution diagram, defect detection is carried out by adopting a regional adaptive fusion algorithm. According to the method, through technical means such as region adaptive division, optical path reverse tracking and region adaptive fusion, multi-view images can be accurately aligned and fused, meanwhile, observation characteristics of different regions are considered, and the reliability of a defect detection result is ensured.

The invention relates to an error compensation method of a birefringence self-calibration laser level meter, in particular to the field of laser level meters, and aims to improve the precision of the laser level meter by combining a birefringence effect, physical modeling and neural network optimization. Firstly, temperature data are collected in real time, Kalman filtering is used for noise reduction, and accurate data are provided for physical modeling; then, through physical constraints such as a heat conduction equation and a Jones matrix, a coupling relation between the temperature gradient and optical parameter changes is established; then, dynamically optimizing the refractive index correction by using a physical information neural network to avoid an overfitting problem; and finally, calculating optical path difference compensation by using a hardware accelerator, correcting a system error in real time, and feeding back and adjusting a network weight. According to the method, the precision and the stability of the laser level meter in an environment with relatively large temperature change are effectively improved.

The invention provides a gas concentration detection device and method, and relates to the technical field of acoustic spectrum gas detection. The device comprises an MEMS infrared radiation light source, an eccentric photoacoustic cell, a digital MEMS microphone and data acquisition and processing equipment, the eccentric photoacoustic cell comprises a cylindrical air chamber, a first spherical reflector, a second spherical reflector and a shell, and an eccentric hole is formed in the position, deviating from the axis, of the first spherical reflector; infrared light emitted by the MEMS infrared radiation light source enters the cylindrical gas chamber, passes through a preset optical path and is absorbed by gas to be detected in the cylindrical gas chamber to generate a photoacoustic signal; converting the photoacoustic signal into a digital signal; determining the concentration of the to-be-detected gas based on the digital signal; wherein the preset optical path is determined based on the distance of the eccentric hole deviating from the axis and the curvature radius of the first spherical reflector and the curvature radius of the second spherical reflector. According to the gas concentration detection device and method provided by the invention, the detection precision of the concentration of the gas to be detected can be improved.

The invention discloses an optical time stretching sweep frequency interference measurement Doppler effect compensation method and device, and relates to the technical field of non-cooperative target absolute distance measurement. In order to solve the defect that the absolute distance measurement precision is reduced due to the fact that the Doppler effect cannot be efficiently suppressed in a complex environment in the prior art, the technical scheme provided by the invention comprises the following steps: generating a sweep frequency laser signal and splitting the sweep frequency laser signal to form measurement light, reference light and resampling light; performing time stretching processing on the reference light to obtain a chirp signal; performing interference on measurement light and the chirp signal to obtain a measurement interference signal; performing interference on the reference light and the resampling light to obtain a reference interference signal; performing cross-correlation processing on the measurement interference signal and the reference interference signal, and extracting an optical path difference; and carrying out distance calculation by combining the resampling data, and outputting a target distance after the Doppler effect is compensated. The method is suitable for optical measurement work for performing high-precision absolute distance measurement on a non-cooperative target in a tiny vibration or disturbance environment.

The invention relates to the technical field of light spot control, and discloses a light spot control method, device and equipment for a focus-adjustable LED light source, and the method comprises the steps: carrying out the parameter collection and optical modeling of the LED light source, and obtaining an LED light source mathematical model; performing light spot feature extraction and multi-wavelength coupling signal separation to obtain a high-energy dominant wavelength component and a low-energy sub-wavelength component; performing spectral decomposition parameter optimization to obtain spectral control parameters; performing attenuation compensation calculation to obtain an optical path compensation coefficient and a focal length adjustment parameter; performing dynamic balance adjustment according to the optical path compensation coefficient and the focal length adjustment parameter, calculating a light spot quality evaluation index and a light intensity ratio, and generating a wavelength balance control parameter; the wavelength balance control parameters are input into the LED drive control system, and the LED light source drive control quantity is output through multi-loop closed-loop control and real-time parameter calculation, so that the accuracy of focal length adjustment is improved, and the stability of the light spot form is ensured.

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 relates to a global high-dynamic exposure interference field locking device and a global high-dynamic exposure interference field locking method. Comprising a first light beam path, a second light beam path, a reference grating, an optical path difference adjusting device, an incident angle adjusting device and a moire fringe detection sensor, wherein the first light beam path and the second light beam path provide coherent light beams; the reference grating and a grating substrate to be subjected to exposure processing are arranged in a coplanar manner; the exposure interference field generates moire fringes through the reference grating, the moire fringe detection sensor detects the overall translation change and overall telescopic change of the moire fringes, and the controller controls the optical path difference adjusting device to adjust the optical path difference between the first light beam and the second light beam according to the overall translation change of the moire fringes so as to achieve phase locking of the exposure interference field. And the incident angle adjusting device is controlled to adjust the relative incident angle between the first light beam and the second light beam according to the overall telescopic change of the moire fringes so as to realize periodic locking of the exposure interference field. The stability of the exposure interference field in the grating holographic processing exposure process is effectively improved.

The invention discloses an all-optical ultrasonic imaging system based on phase modulation, and belongs to the technical field of imaging. The system comprises a laser assembly, an ultrasonic detector, an interference device and an imaging assembly, the laser assembly is used for providing continuous laser for the interference device; the interference device comprises a reference optical fiber arm, a sample optical fiber arm and an optical path adjusting device and is located between the ultrasonic detector and the imaging assembly. Wherein the interference device is used for dividing laser into reference light and detection light, and transmitting the detection light to the ultrasonic detector for phase modulation; the optical path adjusting device is used for adjusting the optical path difference of the two arms, forming interference light of the reference light and the phase-modulated detection light and inputting the interference light into the imaging assembly; the ultrasonic detector is used for generating ultrasonic waves, projecting the ultrasonic waves to a to-be-detected area, and performing phase modulation on the detection light in response to ultrasonic echoes of the to-be-detected area; and the imaging assembly is used for generating a corresponding image according to the interference light.

The invention provides an optical measurement method and device, and belongs to the technical field of optical measurement, and the method comprises the steps: starting a light source with the wavelength changing dynamically to generate a sweep frequency optical signal; dividing the light into a measuring beam and a reference beam by using a light splitting component, guiding the measuring beam to irradiate a target to be measured and then return along the same path, and guiding the reference beam to enter an optical component of which the optical path changes along with the wavelength and then return; based on the low-coherence characteristic of the light source, when the optical paths of the two light beams meet the interference condition, detecting an interference signal by using a sensing component; the optical path difference is determined according to time information in the interference signal, and the thickness of each reflection interface is calculated by combining refractive index data of a target to be measured. Different from the traditional low-coherence interference measurement which depends on a motor and the like to control the movement of a reflector, the method avoids the limitation of mechanical driving on the measurement frequency, and achieves the high-speed optical thickness measurement.

The invention relates to the technical field of total phosphorus detection, in particular to a method for determining total phosphorus in water, which comprises the following steps: 1) digestion treatment: adding an oxidant into a water sample to be detected, and then performing microwave digestion treatment to obtain digested water; a molybdate reagent is added into the digested water, then an improved ascorbic acid solution is added, a chromogenic reaction is completed at the set temperature, and the improved ascorbic acid solution is obtained by mixing an ascorbic acid solution and sodium ethylene diamine tetracetate; measuring the concentration: measuring the absorbance value of the obtained color development product by using a spectrophotometer and a long-optical-path cuvette; and drawing a standard curve: using a phosphorus standard solution as a quality control sample, adding a plurality of calibration points in a low-concentration interval of 0.0-0.1 mg / L, carrying out colorimetric determination, and establishing quadratic equation fitting according to absorbance and concentration so as to determine the total phosphorus content of the water sample to be detected, and the method has the advantages of high sensitivity and good accuracy in total phosphorus testing.

The invention relates to the technical field of large-aperture telescope construction, in particular to a large-aperture spliced telescope progressive generation method, which comprises the following steps of S1, constructing a local co-phase region at the edge of a large-aperture telescope by using spliced sub-mirrors through assistance of a small-aperture secondary mirror, and forming local co-phase imaging capability; s2, the step S1 is repeated, and equal-area local co-phase regions are constructed at the symmetrical positions of the edge of the large-aperture telescope; s3, constructing an interference imaging system through optical path difference adjustment, zero interference elimination and two symmetrical local co-phase regions; s4, repeating the steps S1 to S3, constructing more symmetrical and equal-area local co-phase regions at the edge of the large-aperture telescope, and constructing interference imaging in which the plurality of symmetrical local co-phase regions participate; and S5, constructing local co-phase regions in sequence from the edge to the center until the construction of the whole large-aperture telescope is completed.

The invention relates to the technical field of length measurement, and particularly discloses a length measurement device based on laser interference, which comprises a laser measurement module, an air curtain channel module, an air curtain construction module and a channel adjustment module, the laser measuring module is used for transmitting and receiving laser, the optical path difference change is measured according to the interference principle, and the micro length change of the workpiece can be continuously and accurately measured in real time while the machining module carries out machining operation on the workpiece; a linear channel is formed between the laser head and the measuring reflector through the air curtain channel module, inert gas is continuously introduced into the channel through the air curtain construction module, and an air curtain atmosphere with stable laminar flow is formed, so that pollutants and interference factors such as oil mist, dust, cutting fluid splashing and hot air turbulence generated in a machining area are effectively blocked, and the machining precision is improved. Therefore, the measurement light beam is prevented from being interfered by environmental factors in the propagation process.

The embodiment of the invention discloses a laser and related equipment and method. The laser comprises a laser generation module, a first coupler and a reflective space structure composed of at least one reflective element, multiple paths of laser generated by the laser generation module form optical pulses in the first coupler through interference, the optical pulses are divided into two paths, one path of first optical pulse is transmitted to the reflective element, and the other path of first optical pulse is transmitted to the second coupler. And the other path of second optical pulse is output. The first light pulse is reflected back to the laser generating module by the reflecting element. The optical path of the optical pulse transmitted in the space can be changed by controlling the reflection element to move, so that the repetition frequency of the optical pulse generated by the laser generation module can be adjusted. It is understood that the back-and-forth optical path of the optical pulse in the space can be adjusted by controlling the reflection element to move, equivalently, the optical path of the optical pulse in the space is changed exponentially, and the repetition frequency of the optical pulse can be adjusted in a larger range, for example, large-range frequency modulation over 2 MHz can be achieved.

A push-pull type optical fiber MEMS accelerometer based on a Michelson interferometer comprises a mechanical assembly and two sensing optical fibers, the mechanical assembly is composed of a fixed base and an acceleration sensing chip, the acceleration sensing chip comprises an external frame, a mass block and two sets of spring cantilever beams, the external frame is provided with a thin optical fiber groove, and the thin optical fiber groove is provided with an optical fiber. The mass block is provided with two convex structures serving as reflecting surfaces, and two air cavities are formed between the end face of the sensing optical fiber and the top faces of the convex structures of the mass block and serve as sensing arms of the Michelson interferometer. When the accelerometer is subjected to the action of external acceleration, the mass block moves relative to the external frame to drive the cavity lengths of the two air cavities to change in a push-pull manner, so that the optical path is changed and an interference signal is generated. Interference signals are acquired and demodulated through a photoelectric detector, a data acquisition circuit and a computer, and vibration acceleration signals can be obtained. The invention has the advantages of high sensitivity, strong common-mode noise suppression capability and the like, and is suitable for various dynamic vibration response measurement occasions.

The invention discloses a multi-optical-path ellipsoid cavity and secondary amplification resonance-based photoacoustic gas sensor and process, and relates to a photoacoustic gas sensor in the technical field of photoacoustic spectrum and trace gas detection. The device comprises an optical fiber collimator (1), an air hole (2), a laser incidence hole (3), a multi-optical-path ellipsoid reflection cavity (4), a curved beam waist resonance tube (5) and an electrical microphone (6), the optical fiber collimator (1), the laser incidence hole (3), the multi-optical-path ellipsoid reflection cavity (4), the curved beam waist resonance tube (5) and the electrical microphone (6) are connected in sequence; and the air holes (2) are respectively formed in two sides below the multi-optical-path ellipsoid reflection cavity (4). The invention has the following advantages and positive effects: the photoacoustic sensor has the advantages of high utilization rate, high sensitivity, low noise level and good system stability; the invention provides a new thought for a novel resonant high-sensitivity photoacoustic sensor, and has a huge application prospect in the field of photoacoustic spectrum gas detection.

The invention discloses a high-precision spectral interference signal demodulation method for micro distance measurement. The method comprises the steps of S1, interference spectrum shaping; measuring an interference spectrum and a reference spectrum; selecting a six-item combined cosine window as a primary function of an interference signal to obtain a shaped interference spectrum; s2, performing non-uniform Fourier transform to obtain a frequency spectrum of the target signal; s3, on the basis of a multi-spectral-line interpolation algorithm, interpolation is carried out on the window function to solve a fitting function, and a center frequency k is obtained; and S4, outputting a result. And solving and outputting an optical path difference d. According to the method, a six-item cosine combination window is selected as a primary function of an interference signal, and the problem that the accuracy of signal extraction is influenced by mutual superposition of side lobes and even main lobes of a direct current item and a solved frequency item is solved; an interference spectrum is processed by using a fast non-uniform Fourier transform algorithm, accuracy can still be kept under the conditions that the distance to be measured is increased and sampling is gradually sparse, and the problem of resampling deviation caused by a traditional interpolation method can be solved.

A high-precision double-range infrared gas sensor and a high-precision double-range infrared gas analysis method. The sensor comprises a chamber (10); the outer frame of the chamber (10) is of an enclosed structure; the inner wall of the chamber (10) is provided with a reflective part in an enclosed structure; and a first light source (7), a second light source (8), and an infrared detector (9) are arranged in the cavity of the chamber (10). During measurement, light emitted by the first light source and the second light source (8) is controlled, in a time-sharing manner, to be reflected in the chamber (10) to form a long measurement optical path length and a short measurement optical path length, thereby implementing the measurement of a gas to be measured having a low-range concentration and a high-range concentration. The high-precision double-range infrared gas sensor and the high-precision double-range infrared gas analysis method can simultaneously perform high-precision measurement on a low-range concentration and a high-range concentration, can simultaneously meet uses in HVAC air quality monitoring and heat pump CO2 safety and leakage monitoring, and have low cost and high reliability.

The invention discloses a wavelength division multiplexing-based all-fiber mirror image frequency sweeping interference distance measuring device and method, and relates to the technical field of absolute distance measurement. The objective of the invention is to solve the technical problems in the prior art that frequency spectrum aliasing, frequency sweep nonlinearity, Doppler effect and dispersion mismatch occur in frequency sweep interference measurement, and the measurement precision, the measurement efficiency and the reliability of an all-fiber mirror image frequency sweep interference ranging system cannot be ensured. According to the technical scheme provided by the invention, the wavelength division multiplexing-based all-fiber mirror image frequency sweeping interference distance measuring device comprises a laser unit used for outputting frequency sweeping light; the measurement interferometer light path is used for generating a measurement signal according to the sweep frequency light; the auxiliary interferometer light path is used for generating an auxiliary signal according to the sweep frequency light; the gas chamber calibration light path is used for carrying out auxiliary interferometer light path calibration according to the sweep frequency light; and the data acquisition and processing module is used for obtaining a distance measurement result according to the measurement signal, the auxiliary signal and the calibration signal. The method is applied to the work of all-fiber mirror image frequency sweeping interference distance measurement.

The invention discloses a method and a device for correcting laser focusing aberration in a transparent material, and belongs to the technical field of laser processing. The method comprises the steps that a machining light path containing an object plane, an aspheric reflector and a 4F device is built in Zemax, the surface type of the aspheric reflector is optimized with the minimum focus aberration as the target, and a rise table is derived; an optical path difference and a laser phase are calculated through Matlab, and a phase diagram is generated; and an actual machining light path is built, and a phase diagram is loaded to achieve low-aberration machining. Simulation optimization and phase modulation are combined, aberration caused by refractive index difference is effectively counteracted, wavefront errors are reduced by 58%, the thickness of a machining damage layer is reduced by 70%, the method is suitable for various transparent materials, the machining precision and the material utilization rate are improved, and the method is suitable for high-precision laser machining scenes.

The invention relates to the technical field of real-time rendering, in particular to a real-time light and shadow tracking and rendering system for a virtual reality environment, and the system comprises a light source reachability pre-calculation module which projects a connecting line to a light source to each unit in a three-dimensional grid covering a volume medium based on the scene geometry of the virtual reality environment and the position of the light source. According to the method, the connection line shielding proportion judgment is executed based on the scene geometry and the light source position, the optical path density field data reflecting shielding space distribution is established, and the density representation of illumination reachability is constructed on the voxel level, so that the subsequent light path propulsion has the density sensing capability, and the recognition precision of the complex shielding structure is enhanced. And extracting a normal gradient in the G-Buffer and a brightness variance of a previous frame, fusing an inter-frame geometric boundary change and a brightness fluctuation behavior, constructing a pixel-level feature intensity value set, and writing the pixel-level feature intensity value set into a two-dimensional map for guiding subsequent sampling density regulation and control and realizing local response of cross-frame dynamic information.

The invention provides a rapid evaluation method and system for the soil fertility level, and relates to the technical field of soil fertility detection.The rapid evaluation method comprises the steps that an original absorbance spectral data curve is obtained by scanning a soil sample, the moisture peak absorbance, the actual peak position wavelength and the moisture synthetic frequency characteristic peak width are extracted, and a spectral data basis is provided; a water-salt optical path coupling factor is calculated, water-salt correction operation is carried out in combination with a volume correction coefficient, a virtual dry soil spectrum data curve is obtained, interference of salt on a water optical path is quantified, and a water background and salt masking are eliminated; constructing a characteristic virtual baseline of the organic matter and the total nitrogen, calculating an integral area to obtain characteristic intensity of the organic matter and the total nitrogen, and providing a physical input variable for quantitative inversion; introducing a water-salt optical path coupling factor to invert the organic matter content and the total nitrogen content, and correcting signal depression caused by salt stress; the effective fertility index is calculated and graded by combining the organic matter content and the total nitrogen content of the soil, and the actual fertilizer supply capacity of the soil is comprehensively evaluated.

The present invention discloses a device and method for semiconductor grain double-sided simultaneous fully equal optical path confocal imaging detection based on polarization separation imaging method. The device includes a CMOS or CCD polarization camera, a telecentric imaging lens, a polarization cube beam splitter, a right-angle image rotation prism, a semiconductor grain, and a transparent glass stage for placing the semiconductor grain, which are sequentially arranged in the optical path direction. The advantages of the device and method of the present invention are as follows: It can achieve double-sided simultaneous fully equal optical path confocal polarization imaging detection of the object to be measured, that is, △ = 0, without the need to use a large-depth-of-field telecentric lens to compensate for the optical path difference of double-sided imaging; the double-sided simultaneous polarization imaging detection device has a simple and compact structure and is easy to assemble and debug.

The invention discloses an optical delay line in a Fizeau type optical synthetic aperture imaging system. The Fizeau type optical synthetic aperture imaging system comprises a simulation light source subsystem, a sub-aperture variable baseline subsystem, a light combination imaging delay line, a light combination imaging subsystem, a light combination imaging variable baseline subsystem, a first optical path detection subsystem, a second optical path detection subsystem and the like. Wherein optical delay lines in the first optical path detection subsystem and the second optical path detection subsystem are consistent in structure, composition, function and performance, are symmetrically arranged on two sides of the system, and form an angle of + 49.1 degrees / -49.1 degrees with the horizontal plane; the optical delay line is applied to an optical path detection subsystem in a Fizeau type optical synthetic aperture imaging system composed of four sub-apertures, and is obliquely arranged relative to the horizontal plane, so that each optical path detection telescope can measure three optical path detection light beams at the same time; two sets of symmetrically arranged optical path detection subsystems are set up in the system, so that four-beam optical path difference detection can be realized, and the detection efficiency is high.

The invention discloses a method and a device for detecting a high-resolution and multi-temperature gradient standard absorption cross section of multi-component pollution gas. The method comprises the following steps: a light source unit realizes broadband emergent light by switching sub light sources; the light path unit divides emergent light into two parts, and the two parts of emergent light respectively enter a first resonant cavity and a second resonant cavity which are formed by two plano-concave reflectors and are reflected for multiple times in the two resonant cavities; the long-optical-path absorption cell unit is used for sealing the first resonant cavity and the second resonant cavity and respectively accommodating background gas, background gas and gas to be detected, so that light reflected for multiple times in the two resonant cavities is subjected to long-optical-path absorption; the gas control unit is used for adjusting the total gas amount, the proportioning temperature and the pressure intensity; and the detection and calculation unit adopts two detectors to respectively receive output light reflected by the two resonant cavities for multiple times and calculates an absorption cross section. According to the invention, wider wavelength, temperature and pressure ranges can be covered, the signal-to-noise ratio of measured data is improved, high-sensitivity detection of low-concentration gas is realized, and multi-component gas absorption cross section detection is more accurate.

The invention relates to the technical field of image processing, in particular to an optical thin film quality detection method based on image processing, which comprises the following steps: S101, acquiring a transient light field image sequence of an optical thin film in a dynamic stress field; s102, performing spectral analysis on the brightness time sequence of each pixel point, extracting a dominant frequency component as a brightness oscillation period, processing time domain fluctuation data by adopting a Fourier transform algorithm, and calculating a local optical path difference variation based on the brightness oscillation period of each pixel point in the image sequence; and S103, projecting the phase distortion field to a preset film elastic modulus distribution model, establishing a phase distortion-stress distribution-defect mapping relation, and identifying a modulus mutation region. A dynamic stress field is generated through the synergistic effect of mechanical vibration and thermal radiation, remarkable stress concentration can be generated at the micro-defect position, the deformation difference of the micro-defect is amplified, and therefore the sensitivity of defect detection is improved.