25 results about "Polarimeter" patented technology

The present disclosure describes systems and methods for laser diagnostics systems (e.g., systems and methods for beam combination in heterodyne interferometers and polarimeters). For instance, a laser beam combiner, including a modulator and a wedge combiner, may be implemented in a heterodyne dispersion interferometer. In some cases, a modulator receives laser light (e.g., the laser light having a combination of a vertical polarization component and a horizontal polarization component) and the modulator shifts a frequency of the laser polarization components relative to the other. A wedge combiner having an index of refraction, and the wedge combiner comprises a mirror surface coating a and transmissive surface coating configured to effectively combine different polarization components of the laser light using transmission and reflection techniques, according to embodiments described herein.

The present application relates to a kind of global calibration and measuring method and device of polarimeter, first, the full-wave band light intensity information of standard sample in measurement system is measured, and the measured Fourier coefficient of standard sample is obtained by Fourier transform to light intensity information;Using the measured Fourier coefficient of standard sample and its theoretical Fourier coefficient, global system parameter is iteratively fitted;Then, the full-wave band light intensity information of the sample to be measured is measured, and the Fourier coefficient of the sample to be measured is obtained by Fourier transform to light intensity information;Using global system parameter and the Fourier coefficient of the sample to be measured, the full-wave band polarization of the sample to be measured is calculated.The present application carries out global system calibration and measurement by global system parameter, avoids the overfitting phenomenon generated by fitting system parameter by wavelength-by-wavelength method.

The invention discloses an air refractive index measurement method and device based on interference light polarization parameter detection, a dual-frequency laser emits a beam of mutually orthogonal linearly polarized light, the linearly polarized light is separated into two beams of light according to the polarization direction, and the two beams of light are respectively modulated into 45-degree linearly polarized light through a polaroid and a wave plate and are converged on a spectroscope. And then respective interference signals are formed after passing through the polarizing beam splitter, the wave plate, the vacuum cavity, the fixed mirror and the movable mirror, and are detected by the two polarimeters. The change of polarization azimuth angles of interference light is caused by performing vacuum treatment on the vacuum cavity, the difference value of the polarization azimuth angle change can be detected by the polarimeter, the refractive index of air is measured in real time by measuring the difference value change of the polarization azimuth angles of two paths of interference signals, and the measurement precision can reach 10 <-9 >. Different vacuum loop distance measurement and polarization azimuth angle measurement are combined, the measurement error introduced by the air refractive index is corrected in real time, and the measurement precision of the interferometer is improved.

An s-SNOM subsurface defect fine imaging method and system based on polarization laser scattering guidance belong to the technical field of optical nondestructive testing, and are realized based on a laser, a polarizer, a polarization modulator, a sample to be tested, an optical splitter array, an analyzer array and a detector which are sequentially arranged along the laser propagation direction, and the sample to be tested comprises subsurface defects. Firstly, a to-be-detected sample is subjected to polarization scattering rapid detection to obtain polarization scattering data; secondly, performing quantitative analysis and risk assessment on the non-uniformity of the subsurface structure to obtain a region of interest; thirdly, performing region-of-interest extraction and detection task scheduling on the high-risk region; and finally, performing high-resolution near-field scanning imaging on the region of interest. On the basis of keeping the advantage of s-SNOM high-resolution imaging, cross-scale cooperation between polarization scattering information and near-field imaging can be realized by introducing a rapid and effective prior guiding mechanism, and efficiency and precision are both considered in large-area sample detection.

The utility model relates to a stable base for an automatic polarimeter, which belongs to the technical field of polarimeter bases and comprises a mounting plate, gradienters arranged on two sides of the mounting plate, leveling components arranged in an array are arranged on the mounting plate, a fixing component is clamped on the mounting plate in a sliding manner, a sliding groove is formed in the mounting plate, and positioning holes arranged in an array are formed in the inner wall of the sliding groove. The leveling assembly comprises a mounting sleeve, the mounting sleeve is fixedly mounted on the mounting plate, a threaded rod is rotatably mounted on the mounting sleeve, a hand wheel is arranged at the upper end of the threaded rod, a leveling rod is slidably clamped in the mounting sleeve, and polarimeters of different specifications can be fixed through the fixing assembly, the sliding groove and the positioning hole; according to the technical scheme, displacement of the polarimeter in the detection process is effectively prevented, the accuracy of a measurement result is ensured, the applicability of the technical scheme is improved, the influence of uneven table facet on the measurement result is eliminated through the leveling assembly and the gradienter, it is guaranteed that the automatic polarimeter is located at the horizontal position, and a foundation is provided for accurate measurement.

The invention discloses an anti-interference differential polarimeter, which belongs to the technical field of optical measurement instruments, organically combines magneto-optical modulation with a polarization difference method for the first time, solves the problem of weak optical rotation signal detection in an open environment, has a lower glucose solution measurement limit of 0.020 g / mL, has greatly improved anti-interference capability compared with a traditional polarimeter, and has a wide application prospect. For solutions with different concentrations, the average error is maintained at a lower level of 3.25%, not only can light source fluctuation and ambient light interference be overcome and stable measurement be realized, but also subjective judgment of human eyes can be eliminated and objective quantitative reading can be realized. According to the invention, accurate measurement of a glucose solution in a range of 0.020-0.400 g / mL can be realized, automatic data acquisition and real-time concentration display are realized, and the system integrates electromagnetism, optics and information science, can be used as an ideal platform for college physical experiment and common physical experiment teaching, and has a wide application prospect. The method can also be popularized to measurement of physical quantities such as magneto-optical Kerr effect, weak magnetic field and micro displacement, and is wide in application prospect.

The utility model discloses a dustproof structure for an automatic polarimeter, and aims to solve the technical problem that in the prior art, dust is easy to penetrate through a gap of a cabin cover to enter a sample pool, and the instrument is easy to interfere in the detection process. Comprising a polarimeter body, a placement groove is formed in the surface of the polarimeter body, a hatch cover is movably connected in the placement groove, two cavities are formed in the hatch cover and are a transmission cavity and a compression cavity respectively, and a first sealing air bag is fixedly connected to the position, close to the bottom face, of the side wall of the hatch cover. The end face of the bottom of the hatch cover is fixedly connected with a first sealing air bag, the end face of the bottom of the hatch cover is fixedly connected with a second sealing air bag, the first sealing air bag and the second sealing air bag abut against the side wall of the containing groove, and an inflation assembly is arranged in the compression cavity. And dust is prevented from entering the sample cell.

The application belongs to the technical field of optical polarization measurement, and discloses a full-Stokes polarimeter and a preparation method thereof. The full-Stokes polarimeter comprises a substrate, metal electrodes, an anisotropic crystal material film and an insulating packaging material film. A plurality of pairs of metal electrodes are arranged on the substrate. Two pairs of metal electrodes and a piece of anisotropic crystal material film constitute a detection unit. In each detection unit, the anisotropic crystal material film covers the metal electrodes. The full-Stokes polarimeter comprises at least two detection units, and the detection units are symmetrically distributed at the center of the substrate and are located on the same plane. The crystal directions of the anisotropic crystal material films of the detection units form a set of twist angles. The insulating packaging material film covers the anisotropic crystal material film. The full-Stokes polarimeter can identify the Stokes parameters of full polarization, and has the characteristics of miniaturization, integration, high sensitivity and fast response, and has wide application prospects in the fields of optical fiber communication and sensing.

The invention relates to a differential phase polarimeter (10), comprising a light source (12) for polarized irradiation light (14); a sample chamber (16) for a test object (18), the sample chamber (16) being arranged such that the test object (18) can be irradiated with the irradiation light (14); a linear polarizer (20) arranged downstream of the sample chamber (16) in the light propagation direction; and a detector (22) arranged downstream of the linear polarizer (20) in the light propagation direction and designed to detect a light intensity of the irradiation light (14) which has passed through the linear polarizer (20); wherein the detector (22) is spatially resolving and arranged in such a way that both test object light (32) which has passed through the test object (18) and background light (34) which has not passed through the test object (18) can be detected.

The application belongs to the technical field of optical fiber measurement, and particularly relates to an optical frequency domain polarimeter of polarization beam splitting structure frequency shift detection with ultra-high sensitivity, which comprises a tunable laser source module, a device to be measured module, a polarization beam splitting frequency shift interferometer module, an auxiliary interferometer module and a signal acquisition and analysis module, and is characterized in that: a frequency shifter contained in the polarization beam splitting frequency shift interferometer module is used to move the signal to a high frequency, thereby avoiding the noise aliasing problem from a low frequency; a polarization beam splitter is used to separate the transmission mode and the coupling mode light passing through the device to be measured to suppress the main interference peak, thereby improving the sensitivity to-130 dB, and greatly improving the speed and sensitivity of the polarization crosstalk measurement in principle. Meanwhile, the main extended optical fiber and the acousto-optic modulator are combined to shift the signal, thereby meeting the acquisition of the polarization crosstalk information when the long-distance device is tested.

The invention provides an adjustable amplification signal feedback loop of a full-automatic polarimeter and a gain control method, and belongs to the technical field of polarimeter signal adjustment. The circuit specifically comprises a signal input and preprocessing circuit, a pre-amplification and signal conditioning circuit, a core signal processing circuit, an automatic gain control circuit, a power supply and decoupling circuit and an output buffer circuit which are electrically connected in sequence, the signal input and preprocessing circuit is used for receiving and preprocessing a weak optical rotation modulation signal output by the photoelectric detector; the pre-amplification and signal conditioning circuit is used for amplifying and filtering the preprocessed signal; the adjustable amplification signal feedback loop can solve the problem that an existing full-automatic polarimeter is difficult to select a proper amplification factor under the condition that the difference of the light transmission of a test solution is large.

The invention discloses a Ga2O3 baseline polarization solar blind detector and a polarimeter. The Ga2O3 baseline polarization solar blind detector mainly comprises a Si / SiO2 or another PDMS substrate, a beta-Ga2O3 film prepared based on a traditional mechanical stripping method, and a double-interdigital gold electrode prepared by using an electron beam lithography or thermal evaporation method. The Si / SiO2 or another PDMS substrate is used as a carrier of the lowest layer, the beta-Ga2O3 film is used as a middle photosensitive layer, and the double-interdigital gold electrode absorbs photon-generated carriers of the beta-Ga2O3 film on the uppermost layer. Ultraviolet polarized light with a certain incident power density is applied to irradiate the Ga2O3 baseline polarization solar blind detector, the transmission spectrum and other performance characterization data are measured, and it can be powerfully proved that the Ga2O3 baseline polarization solar blind detector has solar blind light response with high polarization sensitivity.

The application discloses a kind of transmission spectrum matrix and absorbance spectrum matrix measurement system, including along optical path successively arranged infrared light source, collimating lens, interference system, polarizing system, sample bin, polarimeter system, lens, detector and computer processing system;Interference system includes beam splitter, fixed mirror and moving mirror;Wherein beam splitter is cubic component, and the face of its circumferential four faces and collimating lens is face A, from face A along clockwise direction, it is face B, face C and face D in sequence;Fixed mirror is arranged at face B;Moving mirror is arranged at face C;Polarizing system is arranged at face D, including along optical path successively arranged polarizer and extinction ratio 1 / 4 wave plate;Polarimeter system includes along optical path successively arranged extinction ratio 1 / 4 wave plate and polarizer;Computer processing system is used to acquire polarization information and calculate to obtain transmission spectrum matrix and absorbance spectrum matrix.The application also discloses a kind of transmission spectrum matrix and absorbance spectrum matrix measurement system measurement method.

The present application relates to the technical field of optical equipment, and discloses a calibration method and system of a polarization measuring instrument to improve calibration accuracy. The method comprises the following steps: determining an iteration step for adjusting the included angle between a polarizing polarizer and an analyzing polarizer; in each iteration process, obtaining a light intensity variation curve corresponding to one rotation of a wave plate from the acquisition of a detector, performing fast Fourier transform on the light intensity variation curve to obtain a group of coefficients, and calculating the R value corresponding to the included angle between the polarizing polarizer and the analyzing polarizer in each iteration process according to the group of coefficients; drawing a curve of the included angle between the polarizing polarizer and the analyzing polarizer and the R value, finding two included angles that are 90 degrees apart and have the closest R value difference of 0 in the curve, and determining that the included angle corresponding to the two included angles between the polarizing polarizer and the analyzing polarizer is a ±45 degree relationship; and rotating the analyzing polarizer to be parallel to the polarizing polarizer serving as a reference based on the included angle between the polarizing polarizer and the analyzing polarizer being a ±45 degree relationship.

The utility model relates to an automatic polarimeter convenient to observe, which belongs to the technical field of automatic polarimeters and comprises a mounting seat and an automatic polarimeter body, a rotating groove is arranged at the upper end of the mounting seat, a circular plate is rotatably mounted in the rotating groove, a limiting component is mounted at one end of the mounting seat, and one end of the limiting component is connected with the circular plate. The first telescopic rods are installed at the upper end of the circular plate in a circumferential array mode, the automatic polarimeter body is fixedly installed at the free ends of the first telescopic rods, the lifting assembly is installed in the middle of the circular plate, one end of the lifting assembly is connected with the automatic polarimeter body, the square rod is driven by rotating the lead screw to move up and down, and the position of the automatic polarimeter body is automatically adjusted. The angle of the automatic polarimeter body can be adjusted by manually rotating the circular plate, so that a user can conveniently observe a detection result.

The application discloses a full-Stokes parameter analyzer and a polarization measurement method thereof. The analyzer comprises three potassium dideuterium phosphate electro-optic crystal modulators, a fixed delay device, a polarimeter, an imaging lens, a detector, a computer, a signal generator and an alternating-current high-voltage modulator. The incident target light beam sequentially passes through the first KD*P, the second KD * P, the fixed delay device, the third KD * P and the polarimeter, and then is incident on the detector through the imaging lens. The signal generator outputs four frequency-doubled signals after receiving a measurement instruction from the computer, and outputs one signal to the detector and the other three signals to the alternating-current high-voltage modulator. The alternating-current high-voltage modulator controls the phase delay of the first to third KD*P to change periodically in the form of ±45°, ±60° and ±90° square waves by using the three signals. The detector converts the optical signal into an electrical signal and sends the electrical signal to the computer for processing, so that the full-Stokes parameters of the target light beam are obtained.

The application discloses a kind of preparation system and method of Rydberg state based on orthogonal polarization detection and dual-wavelength in-room frequency stabilization, belong to quantum optics and precise measurement field.System includes: atomic gas chamber, first / second wavelength laser, modulation transfer spectrum frequency stabilization unit, dual-wavelength in-room coupling unit, orthogonal polarization detection unit and servo feedback control system.Method by modulation transfer spectrum locking probe light frequency;By dual-wavelength in-room coupling, modulation information is transferred to coupling light across wavelength;By orthogonal polarization detection, the polarization state change caused by the interaction of coupling light and atom resonance is extracted, error signal is generated and coupling light frequency is locked.The core of the application is: only resonance atom causes coupling light field polarization state rotation, non-resonant atom has no contribution;By polarimeter to the polarization component of outgoing light screening, only extract the polarization rotation signal produced by resonance atom, effectively suppress the high DC background noise of laser itself, greatly improve signal purity and signal-to-noise ratio.

The invention relates to a differential phase polarimeter (10) with a light source (12) for polarized irradiation light (14), a sample chamber (16) for a test specimen (18), wherein the sample chamber (16) is arranged so that the test specimen (18) can be irradiated with the irradiation light (14), a linear polarizer (20) which is arranged behind the sample chamber (16) in the direction of light propagation, and a detector (22) which is arranged behind the linear polarizer (20) in the direction of light propagation and is configured to detect a light intensity of the irradiation light (14) that has passed through the linear polarizer (20), wherein the detector (22) is spatially resolving and is arranged so that both test specimen light (32) that has passed through the test specimen (18) and background light (34) that has not passed through the test specimen (18) can be detected.

The utility model relates to polarimetry field discloses a kind of polarimetry optical platform with temperature compensation, including machine table, the top of the machine table is detachably installed with display panel, the bottom of the display panel is inserted with temperature sensor, the right end side wall of the machine table is provided with control panel, the top of the machine table is provided with polarizer, the inner wall of the machine table is slidably connected with pressing block, the inner wall of the machine table is provided with connecting mechanism, the inner wall of the machine table is provided with protection assembly, the connecting mechanism includes wedge, the right end of the wedge is elastically connected with reset spring and machine table, the inner wall of the wedge is hinged with pressing block by hinged rod, the protection assembly includes support frame. In the utility model, through pressing block, hinged rod, wedge linkage mechanism, operation can complete display panel disassembly and installation, without additional tool, maintenance time is greatly shortened, significantly improve equipment maintenance efficiency.

The invention relates to a laser speed measurement and distance measurement integrated device based on an optical frequency comb and a working method thereof, and belongs to the field of optical measurement. The laser speed measurement and distance measurement integrated device comprises an optical comb light source module, an amplification module, a filtering module, a light splitting coupling module and a speed measurement and distance measurement and state monitoring module; the optical comb light source module is used for outputting a plurality of wavelength signals; the amplification module adopts a two-stage amplification structure; the light splitting coupling module comprises a demultiplexer, a circulator, an optical antenna, a Faraday polarimeter and an optical fiber coupler; the speed and distance measurement and state monitoring module comprises a photoelectric detector, a data acquisition card and an FPGA signal processing unit, and the FPGA signal processing unit is used for calculating the speed and distance and counting the packet loss rate. According to the invention, error rate is eliminated by using redundancy in data, accuracy is improved, synchronous high-precision measurement of speed and distance is realized through multi-wavelength cooperative measurement and real-time monitoring of packet loss rate, and the system has the advantages of wide dynamic range, environmental interference resistance, high system integration level and the like.

The invention discloses a vortex polarimeter integrated with a biological tissue simulation unit, and belongs to the technical field of polarimeters, the vortex polarimeter comprises a vortex light generation module, a sample solution module, a polarization detection module and an imaging data processing module which are sequentially arranged, the vortex light generation module is used for generating a light beam and irradiating the sample solution module, and the polarization detection module is used for detecting the polarization of the sample solution module; the sample solution module is used for containing different detection solutions, the polarization detection module is used for measuring optical rotation of the detection solutions, and the imaging data processing module is used for collecting optical field distribution after polarization detection; according to the invention, the biological tissue simulation elements are integrated in an optical path, so that the optical characteristics of human skin tissues are simulated, and the measurement environment highly simulates the actual physiological conditions.

The application discloses a s-SNOM sub-surface defect fine imaging method and system based on polarization laser scattering guidance, belongs to the technical field of optical nondestructive testing, and is realized based on a laser, a polarizer, a polarization modulator, a to-be-detected sample, a light splitter array, a polarimeter array and a detector which are sequentially arranged along a laser propagation direction, and the to-be-detected sample contains a sub-surface defect. Firstly, polarization scattering fast detection is carried out on the to-be-detected sample to obtain polarization scattering data; secondly, quantitative analysis and risk assessment are carried out on sub-surface structure non-uniformity to obtain a region of interest; thirdly, region of interest extraction and detection task scheduling are carried out on a high-risk region; and finally, high-resolution near-field scanning imaging is carried out on the region of interest. On the basis of maintaining the high-resolution imaging advantage of the s-SNOM, the prior guidance mechanism is introduced, cross-scale cooperation between polarization scattering information and near-field imaging can be realized, and efficiency and precision are taken into account in large-area sample detection.

1. Name of the product in this design: Single-channel fiber pairing instrument. 2. Purpose of this product design: It is used to clamp optical fibers and detect optical signals in the optical fibers, and to complete tasks such as optical fiber inspection, fiber jumper troubleshooting, fiber alignment, and optical signal direction detection. 3. The key design feature of this product is its shape. 4. The picture or photo that best illustrates the key design points: Design 1 3D diagram 1. 5. Design 1 is designated as the basic design.

Devices, systems, and methods for the detection of aerosol-generating events, such as wildfires are described. One example method for detecting a presence of an aerosol-generating event includes determining a current position of a neutral point in a sky based on polarimetric measurements conducted by a ground-based polarimeter at one or more measurement wavelengths and at one or more time instances. The method further includes obtaining information corresponding to baseline position of the neutral point, where the baseline position associated with a known atmospheric condition, and comparing the current neutral point position to the baseline neutral point position to determine a presence of the aerosol-generating event.