663 results about "Light extinction" patented technology

The invention discloses a stray light gray value acquisition method, an automatic focusing processing method and an automatic focusing processing system, and relates to the field of automatic focusing. The method is applied to the microscopic automatic focusing device, and comprises the following steps: adjusting the distance between a microscope objective and a reflection point corresponding to light passing through the microscope objective, or the reflection angle of the light, so that the adjusted distance or reflection angle exceeds the focusing range of the microscope objective; or an extinction assembly is additionally arranged on the outer side of the microscope objective, so that the light penetrating through the microscope objective is eliminated; theoretical light spot areas formed by stray light on the surface of the first sensor at different axial height positions of the microscope objective are calculated; and gray values corresponding to theoretical light spot areas in the actual light spot images of the microscope objective at different axial height positions are extracted and used for correcting the light spot image of the object to be measured, so that the influence of stray light on a defocusing amount calculation result is reduced. Therefore, the influence of stray light reflected by the surface of the microscope objective on the defocusing amount calculation is reduced, and the accuracy of the defocusing amount calculation is improved.

The invention discloses a large-aperture plate glass stress birefringence surface imaging measurement method, belongs to the technical field of optical measurement, and aims to solve the technical problem of low glass stress birefringence measurement efficiency in the prior art. Comprising the following steps: moving a sample to be measured and a 1 / 4 wave plate out of a measuring light path, rotating a polarizer to find an extinction position, and rotating the polarizer by N angles nearby to obtain an angle # imgabs0 #; keeping the polarizer and the analyzer unchanged, moving the 1 / 4 wave plate into a measurement light path, rotating the 1 / 4 wave plate, and finding an extinction position; rotating the polarizer by N angles near the extinction position to obtain an angle # imgabs 1 #; the positions and the directions of the 1 / 4 wave plate and the polarization analyzer are kept unchanged, and the sample to be measured is moved into a measuring light path between the polarizer and the 1 / 4 wave plate; the polarizer is rotated through the polarization rotating mechanism, when the included angles between the polarizer and the x axis of the reference coordinate system are 0 degree, 60 degrees and 120 degrees respectively, the light intensities of the three images are obtained through the CCD camera, and the stress birefringence of the sample to be measured is obtained according to the three light intensities.

The invention discloses a near-infrared flexible polarized photoelectric detector and a preparation method thereof. The photoelectric detector comprises an Sb2Se3 micron wire, a PET flexible substrate, a metal Ag electrode, a silver wire and polydimethylsiloxane (a PDMS mixture). According to the preparation method, an effective metal-semiconductor-metal (M-S-M) structure is constructed by combining the Sb2Se3 micron wire and the Ag electrode, curing packaging is carried out by adopting a PDMS mixture, the incident light transmittance is improved, meanwhile, the response speed of a device can be greatly improved through ohmic contact formed by the micron wire and the Ag electrode, and the power loss of the device is remarkably reduced. Compared with the prior art, the detector provided by the invention still keeps a stable and high extinction ratio under mechanical bending deformation, and realizes sensitive polarization, quick response and stable performance of a near-infrared band at the same time.

The invention discloses an infrared polarization detector structure and a preparation method, and relates to the photoelectric detection technology, and the infrared polarization detector structure comprises a reading circuit (1) which is in inverted connection with an infrared material (2); one face of the infrared material (2) is connected with the reading circuit (1), array type polarization grating structures (4) are arranged on the other face of the infrared material (2), any polarization grating structure (4) forms a pixel, isolation groove structures (9) are arranged between the pixels on the infrared material (2), and the isolation groove structures (9) are filled with infrared isolation materials. According to the infrared polarization detector structure provided by the embodiment of the invention, the crosstalk of an infrared detector can be reduced, and the extinction ratio of the infrared polarization detector is improved.

The invention discloses a magnesia carbon brick automatic detection method based on a laser sensor, and the method comprises the following steps: A1, carrying out the multi-angle scanning of the surface of a magnesia carbon brick through a line laser scanner, and generating high-precision three-dimensional point cloud data; a2, inhibiting graphite reflection interference on the surface of the magnesia carbon brick by adopting a polarization filtering system, and compensating a temperature drift error in real time by fusing an infrared thermometer; and step A3, preprocessing the point cloud data through GPU accelerated parallel computing. The invention relates to the technical field of magnesia carbon brick detection. According to the magnesia carbon brick automatic detection method based on the laser sensor, a polarization extinction technology and a multi-source interference compensation mechanism are fused, the problem of high-reflection surface data acquisition distortion is solved, the point cloud integrity is ensured, interference factors such as production line vibration and dust are actively inhibited, and the detection stability is ensured.

The invention relates to the field of performance testing of high-precision fiber-optic gyroscopes, and discloses an automatic testing method and system for the extinction ratio of a high-precision fiber-optic gyroscope, and the method comprises the following steps: constructing a signal light path and a reference light path, and combining the output light of the signal light path and the reference light path into a combined light signal in an orthogonal polarization state; integrally measuring the extinction ratio of the combined optical signal by using an extinction ratio tester to obtain a measured value; the control unit compares the measured value with a target value of 0dB and generates a control instruction based on a difference value; the voltage controller automatically adjusts the voltage of the integrated optical modulator in the signal light path according to the instruction, and iterative optimization is carried out through closed-loop feedback until the actually measured extinction ratio reaches a target value; and finally recording and solidifying the optimal voltage value. According to the invention, single and accurate extinction ratio overall measurement is used for replacing two times of error-prone independent optical power measurement, full-automatic closed-loop control is realized, the precision, efficiency and consistency of optical power balance are remarkably improved, and the skill requirements on operators are reduced.

The invention discloses a medical endoscope with an extinction anti-pollution structure, and relates to the technical field of endoscopes, the medical endoscope comprises an endoscope main body, the front end of the endoscope main body is provided with a camera module, and the periphery of the camera module is provided with an illumination light source for illumination, an outer sleeve and an extinction structural member; a hollow observation opening is formed in the center of the endoscope body in a penetrating mode, a light blocking sinking table used for blocking front direct light beams emitted by the illumination light source is arranged outside the hollow observation opening in a surrounding mode, and a deflection bevel edge used for diffraction deflection of light rays emitted by the illumination light source is further arranged outside the light blocking sinking table. Through the synergistic effect of physical shielding of the light blocking sinking table and diffraction deflection of the deflection bevel edge, front-side direct stray light of the illumination light source is cut off from the source, side-emitting and oblique-emitting light rays are deflected in a targeted mode, light spot and light fog pollution caused by diffuse reflection of the front end of a transparent guide sheath or a catheter is remarkably eliminated, and the imaging definition is remarkably improved.

The invention provides a matt coating composition, a matt coating and a preparation method and application thereof, the matt coating composition comprises the following components: a matt material, a surfactant, a dehydrating agent, polyamic acid and a solvent, and the matt coating composition has a high refractive index and a high matt coefficient through matching of the components. The coating can be coated on the surface of an optical glass element, and a coating is obtained after curing. The refractive index of the extinction coating at the wavelength of 633 nm is larger than 1.70, the extinction coefficient is larger than or equal to 0.09, it is measured that the interface reflectivity of the extinction coating and optical glass with the refractive index of 1.74 can be reduced to 0.026% in the visible spectrum range (400-800 nm), and the extinction coating is superior to current mainstream commercial extinction black paint. The matt coating is simple in preparation process and high in heat resistance, has a wide application prospect in the field of stray light suppression of an optical system, and is suitable for a high-temperature optical system.

The spherical four-glued prism is formed by gluing and connecting three triangular prisms and a curved prism, each gluing surface is plated with a functional film, each non-gluing surface is plated with an anti-reflection film, the outer diameter position of the curved prism is coated with black extinction paint, and the outer diameter position of the curved prism is coated with the black extinction paint. The curved prism can be arranged on any side of the three triangular prisms; the processing technology of the spherical four-cemented prism comprises the following steps: 1) preparing a light blank; 2) plating a first light splitting film, combining, polishing, plating a second light splitting film, combining and polishing in sequence; the method comprises the following steps of (1) preparing a curved prism, (2) cutting the curved prism to form a green body with a specified size, (3) cutting to form a green body with a specified size, (4) pasting an auxiliary lens, (5) processing a spherical surface, (6) removing the auxiliary lens, and (7) plating an antireflection film on the spherical surface, and coating the outer diameter of the curved prism with black matting paint The prism prepared by the method is compact in structure, excellent in performance, high in processing precision and small in gluing deviation, and can realize low-cost and batch production and universalization of a jig at the same time.

The invention relates to a photoelectric integrated double-frequency laser for coherent wind measurement, which comprises a first light source module, a second light source module, a first coupler module, a second coupler module, a third coupler module, a first beam splitter module, a second beam splitter module, a third beam splitter module and a first balanced photoelectric detector module, a second balance photoelectric detector module, a modulator module, an optical phase-locked loop module and a transceiver. Based on the silicon-based optoelectronic chip technology and the photoelectric hybrid packaging technology on the structural level, the coupler, the beam splitter and the photoelectric detector are integrated on the silicon optical chip, and the silicon optical chip, the DFB chip, the coupling optical path, the electrical module and the like are packaged together by utilizing the photoelectric hybrid packaging technology, so that high-density integration is realized; a heterodyne digital optical phase-locked loop technology is applied to a system level, so that a specific frequency difference exists between output signal light and reference light, and pulse light with a high extinction ratio is generated in a modulator cascading mode. Compared with a conventional single-light-source system scheme, the heterodyne Doppler wind measurement laser radar system can greatly improve the integration level, reduce the power consumption and the cost, and is beneficial to mass production, and compared with a homodyne detection mode, heterodyne detection is higher in measurement speed, simpler in scheme and better in stability. The system has extremely high expansibility, and can be applied to systems of optical fiber sensing, laser remote sensing and cold atomic clocks through operations of replacing a transmitting-receiving device, modifying a control program and the like.

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 a cascaded double-ring silicon optical modulator structure based on an Au1ter-Townes effect and a phase change material. The cascaded double-ring silicon optical modulator structure comprises a single-mode bus waveguide and two annular waveguides, a phase-change material is integrated on the surface of the annular waveguide to adjust the initial resonant wavelengths of the two micro-rings; pN junctions are integrated in the annular waveguide, and phase modulation of light is achieved through carrier injection. An Au1ter-Towns effect is utilized to enable a micro-ring transmission spectrum to form two split super-modes, and the extinction ratio corresponding to the two super-modes is changed by adjusting the resonant wavelengths of the double micro-rings; and meanwhile, the cascaded double-micro-ring structure can realize large modulation bandwidth and meet the high-speed transmission requirement. The micro-ring waveguide deposition phase-change material enables resonant wavelength tuning to have non-volatility, and compared with a traditional thermal tuning mode, the micro-ring waveguide deposition phase-change material can greatly reduce regulation and control power consumption. According to the invention, the technical bottleneck of the existing silicon optical modulator is overcome, and the practical application requirements of the fields of optical interconnection, optical communication, optical calculation and the like on the high-extinction-ratio high-speed modulator can be met.

The invention relates to a laminated staggered sub-wavelength polarization grating structure and a preparation method thereof, through staggered arrangement of a first metal grating layer and a second metal grating layer, transmission of polarized light of a transverse electric field can be effectively inhibited, and the extinction ratio is remarkably improved. Through the substrate, the first dielectric layer, the second dielectric layer, the first metal grating layer, the third dielectric layer and the second metal grating layer which are sequentially arranged from bottom to top, the whole device obtains a higher extinction ratio while keeping high transmittance, the overall structure is simple, the processing difficulty and cost are reduced, and the production efficiency is improved. And the number of the used dielectric layers and metal layers is small, the thickness requirement is low, and therefore it is ensured that the cost is controllable.

The invention relates to the technical field of atmospheric transmission characteristics, and provides a method for acquiring atmospheric transmittance in haze weather, which comprises the following steps of: acquiring a mixed composition ratio of a plurality of preset haze particle groups forming a preset aerosol type, and acquiring diameters and complex refractive indexes of a plurality of wet haze particles contained in the plurality of preset haze particle groups; and determining the extinction efficiency factor of each wet haze particle according to the diameter and the complex refractive index. And determining the total extinction coefficient of the preset aerosol type according to the particle distribution function of the preset aerosol type, the mixing composition ratio and the extinction efficiency factors corresponding to the plurality of wet haze particles. According to the total extinction coefficient, the atmospheric transmittance is calculated through an atmospheric transmittance calculation function. The calculation of the atmospheric transmissivity is carried out based on the diameter and the complex refractive index of the wet haze particles, and the influence of the preset aerosol type composed of the plurality of preset haze particle groups on the calculation of the atmospheric transmissivity is considered, so that the calculation accuracy of the atmospheric transmissivity is improved.

A diffuser for de-speckling laser light includes a transparent diffuser substrate with de-speckling microstructures disposed on or formed into a first (i.e. front) side thereof, and a reflective film coated onto an opposite second (i.e. back) side of the transparent diffuser substrate. An extinction layer may be coated onto the reflective film. An anti-reflection (AR) coating may be disposed on the first side of the transparent diffuser substrate. A luminescent wheel is also disclosed, including a disk and an optical ring secured to the disk so as to rotate with the disk. The optical ring includes at least one fluorescent segment and the aforementioned diffuser.

The invention discloses an automatic adaptation method and device for an optical module and a switch, the optical module, a medium and a product, and relates to the technical field of optical communication, and the method comprises the steps: determining a port connected with the switch, recognizing a port identifier of the port, and querying a target voltage optical modulation amplitude value corresponding to the port identifier according to a preset mapping table; acquiring a current temperature value, and inputting the target voltage light modulation amplitude and the current temperature value into a preset fitting function to obtain target light power; and laser is emitted to the outside based on the target optical power, so that the extinction ratios of the laser at different ports and different temperatures are consistent. The adaptability and the performance stability of the optical module are improved.

The invention discloses a polarization sensitive type broadband absorber based on metal-medium stacking, and relates to the technical field of micro-nano photonic devices and infrared detection. The absorber sequentially comprises a bottom-layer high-loss metal reflecting layer, a multi-layer stacked composite dielectric cavity structure and a top-layer sub-wavelength metal grating from bottom to top, according to impedance matching and interference resonance theories, a broadband absorption substrate is constructed through a multi-layer film structure at the bottom, and light energy is converted into heat energy by utilizing the high loss characteristic of bottom layer metal; plasmon resonance is excited through the top metal grating, the coupling efficiency of TM polarized light is enhanced, and TE polarized light is cut off; the above structural design successfully realizes efficient broadband absorption and high polarization extinction ratio in an infrared band. The structure is simple in design, is compatible with a CMOS technology, and has excellent wide-angle stability. And meanwhile, polarization screening can be realized without an external polaroid, and miniaturization and integration of an infrared detection system are facilitated.

The invention discloses an optical assembly, display equipment, a diffusion element and a vehicle, relates to the field of light and solves the problem of glare of the diffusion element. According to the specific scheme, the optical assembly comprises a first linear polarizer, a phase modulation film and a diffusion element. The first linear polarizer emits polarized light, the phase modulation film comprises a first modulation part and a second modulation part, and the product of the refractive index and the thickness of the second modulation part is smaller than the product of the refractive index and the thickness of the first modulation part. The polarization directions of the polarized light entering the first modulation part and the light reflected by the diffusion element and penetrating through the first modulation part are perpendicular to each other; polarization directions of the polarized light entering the second modulation part and the light reflected by the diffusion element and penetrating through the second modulation part are perpendicular to each other. Through the size relation of the products of the refractive indexes and the thicknesses of the first modulation part and the second modulation part, unequal phase differences caused by different incident angles of light rays incident to different positions of the phase modulation film are corrected. The extinction effect of the first linearly polarized light is increased, and glare is avoided.

The utility model relates to the technical field of vehicle lamps, and provides a small-opening module gradually-changing type lens extinction structure, a vehicle lamp and a vehicle, n multi-order sawtooth patterns with different designs are sequentially arranged on the side walls of the two sides of a lens in the direction from back to front respectively, each multi-order sawtooth pattern comprises a side wall light emitting surface YnXn-1 and a sawtooth surface XnYn which are sequentially connected from back to front, each sawtooth surface XnYn is provided with a plurality of side wall reflecting surfaces with gradually-changed inclination angles, and the inclination angles of the plurality of side wall reflecting surfaces are gradually increased from back to front. By adopting the multi-step sawtooth pattern structure, a single total reflection surface is designed into a plurality of different surfaces and is designed into the structure with the gradient inclination angle, so that the total reflection probability of light rays is increased, missing stray light is prevented from passing through the light-emitting surface of the lens, the stray light elimination efficiency is increased, the occupied space is small, and the lens is more attractive.

The invention discloses an extinction ratio measurement system and an extinction ratio measurement method, and relates to the technical field of optical module extinction ratio measurement. The transimpedance amplification circuit is connected with the optical module to be measured and used for monitoring the optical signal intensity of the optical module to be measured and obtaining a power monitoring voltage signal; decomposing the optical signal of the optical module to be tested to obtain a reference voltage signal and a test voltage signal; the linear output circuit is connected with the transimpedance amplification circuit and used for carrying out linear amplification on a difference value between the reference voltage signal and the test voltage signal to obtain a modulation amplitude voltage signal; and the processing circuit is respectively connected with the transimpedance amplification circuit and the linear output circuit, and is used for determining the light modulation amplitude according to the ratio of the power monitoring voltage signal to the modulation amplitude voltage signal, and determining the extinction ratio of the optical module to be detected according to the light modulation amplitude and the light power corresponding to the power monitoring voltage signal. The measurement cost of the extinction ratio of the optical module can be reduced.

The invention relates to the technical field of communication, in particular to a pluggable optical module automatic gain control method and system and a double-path output peak detection circuit, and the method comprises the steps: configuring and initializing a double-path peak detection device in an optical module; inserting the optical module into a target port, and obtaining a peak value of the double-path peak value detection device under a preset frequency; calculating an insertion loss value according to the peak value under the preset frequency; calculating an AGC target value of the target port based on the insertion loss value; and adjusting the gain of the linear driver by taking the matching AGC target value as a target. The objective of the invention is to dynamically adjust the gain of the linear driver and improve the consistency of the extinction ratio of each port.

The invention relates to the technical field of optical engineering, in particular to a stray light suppression structure and method.The stray light suppression structure structurally and mainly comprises a front suppression structure and a rear suppression structure, the front suppression structure is located at the front end of an optical system and covers all light entering the system, and the rear suppression structure is located in the middle of a light path and covers all light entering the system; the front suppression structure and the rear suppression structure are the same in shape and arrangement, but the size of the front suppression structure is reduced in proportion to adapt to the clear aperture of the light path position where the rear suppression structure is located, and the surfaces of the front suppression structure and the rear suppression structure are both coated with extinction paint to prevent stray light from continuing to interfere with system imaging after reflection or scattering on the surfaces. According to the invention, through the design of partitioning the clear aperture by the partition plate, the passing angle of light can be more accurately controlled, stray light can be inhibited, and the imaging quality of an optical system and the quality in a light beam propagation process are enhanced.

The invention discloses an infrared polarization detector and device, and relates to the photoelectric detection technology. The detector chip (2) is electrically connected with the reading circuit (1) through an indium column (5), a polarization grating (4) is arranged on one surface, far away from the reading circuit (1), of the detector chip, and a pixel array structure (3) is arranged on the other surface, close to the reading circuit (1), of the detector chip; the relative positions of the pixel array structures (3) and the polarization gratings (4) are in one-to-one correspondence. Through the design of the n-type region of the polarization grating structure, the crosstalk of adjacent pixel signals can be blocked, so that the response value when the light transmission axes of the polarizer and the polarization grating are vertical is reduced, and the extinction ratio of the infrared polarization detector is improved.

The utility model belongs to the technical field of automobile ornaments, and provides a camera extinction structure on a vehicle stand column decoration plate, which comprises a stand column inner plate, a stand column outer decoration plate and a camera module, and a camera perspective area is arranged between the stand column outer decoration plate and the stand column inner plate. The camera module is installed on the inner plate and can transmit through the camera perspective area for shooting and image acquisition, the stand column inner plate is provided with a camera light extinction area, and the camera light extinction area is provided with a light extinction assembly. The utility model has the advantages that the scheme of arranging the extinction components in various modes in the inner plate of the upright post is utilized, the overall structure is simple, the environmental protection property is good, the extinction effect is good, and the manufacturing cost is low.

The invention relates to the technical field of laser radars, and provides an extinction lens barrel and a laser radar, and the extinction lens barrel comprises a lens barrel body, the lens barrel body is provided with a first optical channel and a first installation groove, the lens barrel body is provided with a three-dimensional extinction structure, the first installation groove is located at the light output end of the first optical channel, and the first installation groove is used for installing a beam splitter. And the three-dimensional extinction structure is positioned on one side of the first mounting groove and is used for reflecting stray light and / or absorbing stray light to the outside of the lens cone body. According to the extinction lens cone, according to the Lambert law, Ii = In * cosi, the three-dimensional extinction structure is different from common single-slope extinction, and under the condition that the structure size is not changed, the three-dimensional extinction structure can remarkably increase the inclination angle of residual reflected light on the slope, so that more stray light is reflected or directly absorbed; the stray light returned to the receiving optical system through diffuse reflection is effectively reduced, so that the detection precision of the laser radar is improved.

The invention provides a polarization insensitive 2 * 2 Mach-Zehnder optical switch based on a silicon nitride waveguide device. The silicon nitride waveguide layer comprises two optical input waveguides, two 2 * 2 bent waveguide type 3dB directional couplers, two symmetric Mach-Zehnder interference (MZI) arms and two optical output waveguides; two light input waveguides are respectively coupled with two input ports of a first 2 * 2 3dB directional coupler, through two paths of symmetrical MZI arms, a straight waveguide of one MZI arm is attached with a thermode to carry out optical signal phase modulation, output light of the two paths of MZI arms is input to a second 2 * 2 3dB directional coupler, so that the output light of the two paths of MZI arms is combined and interfered, and the output light of the two paths of MZI arms is output to the second 2 * 2 3dB directional coupler. And two paths of output waveguides are respectively led out. Based on the silicon nitride square waveguide and the 2 * 2 bent waveguide type 3dB directional coupler, the directional coupler has the advantages of being insensitive to polarization, large in bandwidth, low in insertion loss, high in extinction ratio and the like.

Disclosed in the present invention are an optical apparatus for measuring a nanoparticle concentration and a measurement method thereof. The optical apparatus comprises a sample cell, a rotary wheel installed with a neutral-density filter, an APD detector, a PD detector, a laser device, a lens, a data acquisition card and a control unit, wherein a laser emitted by the laser device passes through the lens to illuminate a sample in the sample cell; in a transmission direction, the intensity of the transmitted laser is measured by means of the PD detector; and a scattered signal from the sample is accepted at a 90° or in a backward direction by the APD detector connected to an optical fiber. The measurement method comprises: measuring a volume fraction Φ of a sample by means of a transmitted laser intensity signal and a light extinction method; measuring a particle size distribution of the sample by means of a scattered laser signal and a dynamic light scattering method; and calculating a volume fraction Φi and a number concentration of each particle size peak by means of the volume fraction Φ and the particle size distribution. The present invention combines a light extinction method and a dynamic light scattering method to implement the measurement of both a volume concentration and a number concentration of a sample.

Disclosed in the present invention are an apparatus and method for performing bias control on an adaptive Mach-Zehnder modulator (MZM) on the basis of pulse phase stability. The apparatus comprises a mode-locking femtosecond laser, an MZM, an optical fiber coupler, a photoelectric detector, an amplification filter, an analog-to-digital converter, an FPGA bias control module, a digital-to-analog converter, a bias amplifier and an electric pulse generator, wherein the FPGA bias control module demodulates a high-frequency signal amplitude and outputs an initial bias value, sets an MZM working point at a Null point, and also demodulates a low-frequency signal phase at this moment as a target value, compares same with a low-frequency signal demodulation phase which is updated in real time, so as to generate an error signal, and adjusts a bias voltage in real time by means of PID, so as to realize the stability at the Null point. In the present invention, a method for maintaining pulse phase stability is used to stabilize an MZM at a Null point, without introducing additional noise, thereby improving the bias control precision, ensuring the long-term stability of a working point, and realizing a high-extinction-ratio output of laser pulses at any frequency.

The invention discloses a double-optical-path spectrum system for turbidity measurement and interference compensation, which comprises a double-optical-path spectrum measurement system, and the double-optical-path spectrum measurement system comprises a light source, and an optical path collimation and switching system, a double-optical-path measurement system, a transmission measurement system and a scattering measurement system which are electrically connected, the particle size distribution and extinction spectrum of the water body are reconstructed by combining a spectral analysis algorithm, and turbidity measurement and interference compensation are carried out on the water body. Sampling is carried out by adopting a dual-optical-path technology; scattering signals of a water body to-be-measured sample are measured by combining sampling data with an integrating sphere so as to verify the influence of the scattering signals, particle size distribution of water body particles is reconstructed by utilizing a light total scattering method, and a particle reconstruction wave band is determined by adopting a mode of reconstructing a comparison standard solution in multiple wave bands; secondary inversion of an extinction spectrum is carried out according to a reconstruction result, accumulation correction is carried out by using multiple groups of compensation results of different filter membranes of adjacent gradients, and the accuracy of a later turbidity compensation result is improved.

The invention relates to an aerosol mass concentration estimation method based on a laser radar and an optical characteristic instrument, and the method comprises the steps: calculating an extinction coefficient and a backscattering coefficient of atmospheric molecules and an aerosol backscattering coefficient based on collected data; calculating the extinction coefficient of the aerosol based on the initial assumption of the ratio of the extinction coefficient to the backscattering coefficient of the aerosol; the difference between the aerosol extinction coefficient observed by the aerosol extinction instrument and the calculated aerosol extinction coefficient inverted by the laser radar is analyzed, an error convergence index is constructed, and a correction strategy of the aerosol extinction coefficient of the laser radar is formulated; based on observation data of an aerosol particle size spectrometer and a corrected laser radar aerosol extinction coefficient, in combination with an addition mathematical model and a logarithmic mathematical model, a sliding window width dynamic adjustment strategy is designed, and a relation model of the laser radar aerosol extinction coefficient and mass concentration fusing linear and nonlinear model characteristics is constructed. And accurate estimation of the mass concentration of the aerosol is realized.