1563 results about "Polarised light" patented technology

The invention discloses a rock slice mineral identification method, a medium and equipment, and relates to the technical field of mineral identification, the method comprises the following steps: obtaining single polarized light images and orthogonal polarized light images of a rock slice under a plurality of polarized light angles, and carrying out image labeling to obtain a label image set; a rock slice mineral recognition model is constructed based on a U-Net architecture, the left part of the rock slice mineral recognition model of the U-Net architecture is connected with five feature extraction blocks through four downsamples, each feature extraction block is formed by connecting a convolution and a Swing-Transform Stage, and features are output by the Swing-Transform Stage; and training and testing the model by using the label image set, and inputting a to-be-detected rock slice image into the trained model to obtain a mineral segmentation result. According to the scheme of the invention, the method is high in recognition capability for complex mineral images under polarized light of different angles.

The present invention discloses an optical module with adjustable polarization, which can be generically assembled in a lamp body assembly. The optical module with adjustable polarization includes a polarization lens body, and a hollow first cylinder and a second cylinder. One end of the first cylinder is detachably and rotatably connected to one end of the second cylinder. The polarization lens body is rotatably arranged in the inner cavity of the first cylinder. The polarization lens body is provided with a guiding and positioning portion at the edge perpendicular to the rotation axis. The second cylinder is provided with an inclined guiding slot hole, and the guiding and positioning portion is slidably connected with the guiding slot hole. The second cylinder is provided with a first engaging portion for detachably and rotatably connecting with the lamp body assembly. The present invention utilizes the first engaging portion on the second cylinder to assemble the optical module on the lamp body assembly, so that by rotating the first cylinder and the second cylinder, the polarization lens body can be deflected and rotated, enabling the light to be deflected by the polarization lens body and changing the irradiation angle, thereby realizing the adjustment of polarization in a limited space and completing the change of optical effects.

The invention provides a visual system, which comprises an element group and a lens cone group, when the diopter of the visual system is from + 2D to-5D, the moving distance delta L of the second element group along the optical axis, the combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens, and the combined focal length fz2 of the second lens, the second quarter-wave plate and the polarizing film meet the condition that delta L * (fz1 / fz2) is greater than or equal to 0.90 mm and less than or equal to 1.82 mm; and the maximum thickness Lb from the first side surface of the second lens barrel to the second side surface of the second lens barrel along the direction of the optical axis, the outer diameter Dbs of the first side surface of the second lens barrel and the inner diameter dbs of the first side surface of the second lens barrel meet the condition that Lb / (Dbs-dbs) is more than or equal to 0.56 and less than or equal to 2.36. The problem that smooth zooming and image quality improvement of a visual system in the prior art are difficult to consider at the same time is solved.

The invention provides a VR visual system, the VR visual system comprises an element group and a lens cone group, the element group sequentially comprises a first element group and a second element group from a first side to a second side along an optical axis of the VR visual system, the second element group can move along the direction of the optical axis, the combined focal length fz1 of the reflective polarizing element, the first quarter-wave plate and the first lens and the inner diameter dam of the second side surface of the first lens barrel meet the condition that fz1 / dam is more than or equal to 1.60 and less than or equal to 2.66; and the outer diameter Dbs of the first side surface of the second lens cone, the inner diameter dbs of the first side surface of the second lens cone and the distance delta L of the second element group moving along the optical axis when the diopter of the VR visual system is from + 2D to-5D meet the following condition: (Dbs-dbs) / delta L is greater than or equal to 2.63 and less than or equal to 7.45. The VR visual system solves the problem that a VR visual system in the prior art is large in diopter adjustment range and is difficult to consider the structural stability at the same time.

The invention discloses an alanine aminotransferase detection device and method based on a liquid crystal microcavity array, and belongs to the field of optical sensing. The device comprises a functional liquid crystal microcavity array, an excitation optical fiber and a collection optical fiber, the microcavity array is composed of liquid crystal microcavities doped with fluorescent dye and stearic acid, and the multiple microcavities are independently distributed and serve as optical sensing units; the excitation optical fiber is used for synchronously exciting the microcavity to generate an echo wall mode, and the acquisition optical fiber acquires resonance spectrum signals of each channel in real time; the functionalized liquid crystal microcavity is converted into a bipolar configuration from a radial configuration in an enzymatic reaction, echo wall mode spectrum red shift is caused, spectrum shift time is in negative correlation with enzyme concentration, and dual-channel detection is realized by matching with conversion time of a polarized light pattern. According to the detection structure based on the liquid crystal microcavity array provided by the invention, high-flux, real-time and label-free rapid detection on the concentration of alanine aminotransferase can be realized.

The embodiment of the invention provides a dimming module, a dimming device and a dimming structure, relates to the technical field of dimming and is used for improving the dimming effect of the dimming module, and the dimming module comprises a first base material layer, a second base material layer, a dye liquid crystal layer and a polarization layer. The first substrate layer is provided with a first optical axis; the second base material layer and the first base material layer are oppositely arranged; the second substrate layer is provided with a second optical axis; the dye liquid crystal layer is positioned between the first base material layer and the second base material layer; the polarizing layer is located between one of the first base material layer and the second base material layer and the dye liquid crystal layer; a first included angle is formed between the polarization direction of the polarization layer and at least one first optical axis, and the first included angle is larger than 0 degree and smaller than 90 degrees; a second included angle is formed between the polarization direction of the polarization layer and the at least one second optical axis, and the second included angle is larger than 0 degree and smaller than 90 degrees. The dimming module is used for adjusting the light transmittance.

The invention relates to a lithology identification method based on rock slice single polarized light image and orthogonal polarized light image feature fusion, and the method comprises the steps: S1, collecting a rock slice single polarized light image and an orthogonal polarized light image, carrying out the preprocessing, carrying out the lithology marking, and building a rock image data set; s2, constructing a lithology identification model, including taking WTConvNeXt-Inception as a backbone network to extract features, performing feature fusion of a single polarized light image and an orthogonal polarized light image by a cross attention mechanism, and classifying the spliced features; and S3, inputting a rock image to be identified into the trained lithology identification model, and outputting a lithology identification result. Aiming at the problem of low lithology identification accuracy, the invention proposes the feature fusion of the single polarized image and the orthogonal polarized image to establish a lightweight model, realizes the rapid, accurate and full-automatic identification of the rock slice image, and effectively improves the lithology identification accuracy.

The invention relates to a temperature test and evaluation system for a polarization-maintaining optical path assembly of a fiber-optic gyroscope. The polarization-maintaining light path assembly and the test tool thereof are placed in a temperature box with a vibration isolation foundation. Other optical devices and a gyro circuit are arranged outside the incubator. And the power box, the fiber-optic gyroscope and the acquisition equipment are electrically connected through the test cable. Before the temperature test, the output of the normal-temperature fiber-optic gyroscope is electrified and monitored, the acquisition time is set, the mean value and the standard deviation of normal-temperature output data are calculated, and the temperature test can be started after the requirements are met. And according to the full-temperature output data, calculating extreme values and standard deviations before and after temperature compensation to jointly form evaluation indexes of the polarization-maintaining optical path assembly. According to the system disclosed by the invention, the full-temperature zero-bias stability qualification rate is improved after the fiber-optic gyroscope product is compensated.

The utility model relates to an LCOS (Liquid Crystal On Silicon) projection device, which comprises a light source module capable of emitting red, green and blue light beams, a polarization filter and an imaging lens which are sequentially arranged along a projection light path, an LCOS chip capable of modulating the polarization state of incident light is arranged on a projection light path between the polarization filter and the imaging lens, and an imaging lens group capable of imaging the incident light onto the LCOS chip is arranged on a projection light path between the light source module and the polarization filter. And a polarization layer capable of transmitting P polarized light and reflecting S polarized light is arranged on the polarization filter. Compared with a polarizing prism applied to a traditional LCOS projection light path, the LCOS projection light path has the advantages that through the arrangement of the polarizing filter and the polarizing layer which is arranged on the polarizing filter and can transmit P polarized light and reflect S polarized light, the LCOS projection light path has higher polarization efficiency, stray light is reduced, and optical efficiency is improved.

The utility model discloses a visual system which comprises a lens cone, a lens group and a spacing element group, wherein the lens group and the spacing element group are assembled in the lens cone; the lens group comprises a first lens with positive focal power, a reflective polarization element, a first quarter-wave plate, a second lens with positive focal power, a third lens with negative focal power, a partial reflection element and a second quarter-wave plate which are sequentially arranged from the first side to the second side along the optical axis. The fourth lens has negative focal power; the spacing element group comprises a first spacing element, a second spacing element, a third spacing element and a fourth spacing element; wherein the number of the lenses with focal power in the lens group is four; the effective focal length f1 of the first lens and the effective focal length f of the visual system satisfy 1.5 lt; f1 / flt; 1.9); the combined focal length FG1 of the first lens, the reflective polarizing element and the first quarter-wave plate and the inner diameter d1s of the first side surface of the first spacing element meet the following conditions: 2.35 lt; fG1 / d1slt, FG1 / d1slt; and 2.75%.

The invention provides a visual system. The visual system comprises a lens cone, a lens group and a spacing element group, the lens group and the spacing element group are arranged in the lens cone, and the lens group is composed of four lenses, a polaroid, a reflective polarizing element, a quarter-wave plate and a reflective element. The four lenses are sequentially a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power and a fourth lens with positive focal power from the first side to the second side; f23 / d3s is more than or equal to-9.75 and less than or equal to-8.72; f / (CP1 + EP13) is more than 5.00 and less than 5.40. The problem that stray light is serious due to the fact that a four-piece type visual system in the prior art is provided with a bonding lens and a reflecting part to meet the requirement for structure compactness is solved.

The utility model discloses an optical imaging system. The optical imaging system comprises a lens cone, an imaging group and a second spacing element, wherein the imaging group and the second spacing element are arranged in the lens cone. The imaging group sequentially comprises a linear polarization film, a reflective polarization element, a quarter-wave plate, a first lens, a second lens, a third lens, a fourth lens and a partial reflection layer from the first side to the second side along the optical axis; wherein the first lens and the second lens are glued, and the third lens and the fourth lens are glued. The second spacer element is disposed on the second side of the second lens and is in contact with the second side of the second lens. Wherein the outer diameter D0m of the second side end face of the lens barrel and the outer diameter D2m of the second side face of the second spacing element meet the condition that D0m-D2m is larger than or equal to 4.51 mm and smaller than or equal to 5.8 mm; the inner diameter d2m of the second side surface of the second spacing element, the inner diameter d2s of the first side surface of the second spacing element, and the axial distance T23 from the second side surface of the second lens to the first side surface of the third lens satisfy the following formula: (d2m-d2s) / T23 is greater than or equal to 0.97 and less than or equal to 2.79.

The invention relates to the technical field of process minerals, in particular to a metal mineral X-ray plate image mineral composition segmentation method based on improved yov8n, which comprises the following steps: S1, shooting a metal mineral X-ray plate image through a polarizing microscope, and accurately marking by using Label software; and S2, a small target detection layer and an SCConv module are added on the YOLOv8n, and a ContextAggregation attention mechanism is introduced at the same time, so that the detection capability and feature extraction of a small target can be enhanced. S3, performing multiple rounds of training by using an improved YOLOv8n model, adjusting a learning rate and refining training parameters, calling and outputting a trained weight file, and completing segmentation of mineral components of the metal mineral X-ray plate image; and S4, through performance comparison with other models, evaluating the model by using an average precision mean value (Map at 0.5) and an actual segmentation effect picture. The problems of common misrecognition and low average precision (Map at 0.5) during fine-particle-size mineral processing by a traditional segmentation method are effectively solved, and the Map at 0.5 of an improved model is improved by 6.75%.

The invention discloses an image acquisition method and system for a dual-wavelength circular polarization camera, and the method comprises the steps: setting two independent nanosecond pulse laser sources, and respectively transmitting lasers with different wavelengths; respectively carrying out left-hand circular polarization and right-hand circular polarization treatment on the two lasers; integrating the two nanosecond pulse laser beams subjected to circular polarization treatment into one beam, wherein the two beams are completely overlapped and are coaxial; the integrated nanosecond pulse laser beams are irradiated to a target object, and reflected light is collected through a double-spectrum camera to form two images with different wavelengths; and distributing weights for the image according to the importance of the polarization information, and generating a comprehensive image by adopting an image fusion technology. According to the image acquisition method and system of the dual-wavelength circular polarization camera, two independent nanosecond pulse laser sources are arranged to emit short-wavelength laser and long-wavelength laser respectively, the two beams of laser are subjected to left-handed and right-handed circular polarization processing and then integrated into one beam, and efficient imaging in a complex environment is achieved.

The embodiment of the invention provides an AR light machine module, AR glasses, an AR display system and an AR display method. The AR light machine module comprises a light source, an illumination waveguide, an imaging lens, an LCOS panel, a diaphragm and a polarization control assembly. The light source provides illumination light; the illumination waveguide is provided with an entrance pupil area and an exit pupil area, and the illumination light is coupled in from the entrance pupil area and is coupled out from the exit pupil area; the imaging lens is used for geometrically amplifying the illumination light coupled out of the exit pupil region; the LCOS panel is used for carrying out phase modulation on the amplified illumination light and forming imaging light, and the imaging light is projected to the exit pupil area through the imaging lens and then is emitted; the diaphragm is arranged on an imaging light path emitted by the exit pupil area and is used for adjusting the size of an exit pupil; the polarization control assembly comprises a polarization beam splitting film, and the polarization beam splitting film is located between the exit pupil area and the diaphragm and used for reflecting S-line polarized light and transmitting P-line polarized light.

A modular quantum key distribution system and relative modulation module and demodulation module. The system includes: a photon source module; a modulation module, physically separated from the source module and operatively connected to the source module by a first optical communication channel and including a first polarization stabilizer and a first retarder plate and a second retarder plate, placed downstream of the first polarization stabilizer and controlled by an actuator; and a receiving unit operatively connected to the modulation module by a second optical communication channel and including a second polarization stabilizer, a third retarder plate, placed downstream of the second polarization stabilizer and controlled by an actuator, a polarizing beam splitter, placed downstream of the third retarder plate, and a single photon photodetector configured to detect a logic state of each photon and transmit the detected logic state to a counting register.

The invention discloses a method for determining the shale content of tight sandstone, and relates to the technical field of exploration and research of tight rock oil and gas reservoirs. The method comprises the following steps: identifying a rock slice identification photo by using a computer image identification method, obtaining the area percentage of debris particles with the diameter greater than a set threshold value in the slice identification photo, and then calculating the area percentage of argillaceous particles in the slice identification photo; according to the area percentage of the argillaceous particles and the corresponding times of the polarizing microscope, displaying the argillaceous particles in a rectangular coordinate system in a scatter mode; fitting all scatter points by using a nonlinear least square method, and establishing a shale content volume percentage change relation curve under different objective lens multiples of the polarizing microscope; and solving the curvilinear equation, and calculating the shale content of the sample by using the curvilinear equation. According to the method, the error caused by the fact that the shale content is calculated by an eye estimation method singly through a slice identifier is avoided, and the analysis result is more consistent with the real content of the sample, so that the accuracy of the shale content determination by an image method is greatly improved.

The invention provides a 2-micron high-order Poincare sphere vector vortex ultrafast laser polarization detection method, which comprises the following steps of: performing out-cavity and out-cavity beam splitting on 2-micron high-order Poincare sphere vector vortex ultrafast laser through a beam splitting module, directly detecting light intensity spatial distribution by one beam, and dynamically regulating and controlling the out-cavity of a polarization state by the other beam after the other beam enters a polarization regulation and control module; the computer communicates with the ESP32 development board to control the hollow rotary displacement table to change the forward included angle between the fast axis and the x axis of the vortex quarter-wave plate so as to change the polarization state of incident light; through the ultrafast laser polarization beam splitter, the polarization state of passing light is limited, and horizontal line polarized light perpendicular to a beam splitting surface passes through the ultrafast laser polarization beam splitter; dynamically detecting real-time data of light intensity which is dynamically adjusted outside the cavity through the polarization regulation and control module each time through a light intensity detection module; and the polarization analysis module receives regulation and control parameters of the polarization regulation and control module and light intensity parameters of the power detection module, analyzes the polarization state of a light beam input into the system, and completes 2-micron high-order Poincare sphere vector vortex ultrafast laser polarization detection.

A system includes a camera module located within a vehicle, a linear polarizer module positioned in a field of view of the camera module, and a control module in communication with the camera module and the linear polarizer module. The camera module is configured to acquire image frames depicting scenery external to the vehicle and transmit the image frames to a perception pipeline of the vehicle. The control module is configured to receive an image frame from the camera module, analyze the image frame to identify whether a reflection is present, and in response to identifying the reflection in the image frame, selectively activate the linear polarizer module to remove the reflection from a subsequent image frame captured by the camera module. Other example systems and methods for removing reflections from image frames captured by camera modules located within vehicles are also disclosed.

The utility model discloses an optical system. The optical system sequentially comprises a first lens, a reflective polarizing element, a first quarter-wave plate, a second lens, a third lens, a partial reflection element, a second quarter-wave plate, a polarizing film and a fourth lens from a first side to a second side along an optical axis, the first lens has positive focal power, and the first side surface of the first lens is a convex surface; the second lens has negative focal power, the first side surface of the second lens is a plane, and the second side surface is a concave surface; the second side surface of the third lens is a convex surface; the first side surface of the fourth lens is a plane; the effective focal length f1 of the first lens and the effective focal length f2 of the second lens meet the following formula:-0.7 lt; f1 / f2lt; -0.15, < = 0.15; the combined focal length fz2 of the second quarter-wave plate, the polaroid and the fourth lens and the curvature radius R8 of the second side face of the fourth lens meet the condition that fz2 / R8 is larger than or equal to-2.0 and smaller than or equal to-1.5.

The invention discloses a layered liquid crystal electrolyte based on a dynamic self-assembly strategy and a preparation method and application thereof, and belongs to the technical field of new energy materials, and the preparation method comprises the following steps: uniformly mixing dodecyl non-glycol ether and n-decanol according to a mass ratio, heating and centrifuging to a homogeneous phase to obtain a mixed element; dropwise adding a zinc chloride aqueous solution into the mixed element, carrying out vortex mixing, and centrifuging to remove bubbles; placing the sample in a constant-temperature environment for standing, and screening a phase region with anisotropic characteristics through a polarizing microscope; and continuously carrying out constant-temperature self-assembly on the screened sample, and representing the lamellar liquid crystal structure through a polarized optical microscope and small-angle X-ray scattering. A two-dimensional layered liquid crystal structure is constructed through synergistic self-assembly of the surfactant and the solvent, a zinc ion source is provided in combination with the zinc chloride aqueous solution, and the ion transmission efficiency and the thermal stability are remarkably improved.

The invention discloses a method for segmenting different strata series of stratified shale and identifying oiliness, and belongs to the field of oil-gas exploration. The invention discloses a strata division method based on XRF (X-Ray Fluorescence) mineral scanning and single polarization-fluorescence-laser confocal optical lens combined observation, which realizes accurate identification and segmentation of micron-sized strata boundaries of a layered rock core sample from different scales, and performs group component extraction on segmented independent strata. And carrying out chromatography-mass spectrometry analysis and FT-ICR MS analysis on the extracted saturated, aromatic, non-aromatic, leached and other family components. The TSF spectrum, light and heavy components, biomarker compounds, non-hydrocarbon compounds and other data obtained through the experiments are comprehensively analyzed, layering scale oiliness difference quantification and oil source comparison are achieved, and the shale oil micro-migration phenomenon is determined. The influence of the heterogeneity of the layered rock core sample on a result obtained by a traditional analysis method is overcome. According to the technology, direct evidences are provided for accurate prediction of shale oil desserts, exploration risks are reduced, and economic benefits are improved.

The present application provides a display module and a display device. The display module is provided with optical transparent resin in a first via hole of a polarizing layer, and the optical transparent resin is cured after a cover plate and the polarizing layer are attached to each other. In this way, the via hole of the polarizing layer is fully filled using the optical transparent resin in a fluid state before cured, preventing a display panel from collapsing due to a void in the via hole.

The invention belongs to the field of infusion monitoring, and particularly relates to a target container liquid level visual detection and early warning method and system.The method comprises the steps that an enhanced image and a three-dimensional point cloud sequence are obtained by collecting a target container deformation image, a three-dimensional point cloud and flexibility attribute data and conducting polarized light enhancement preprocessing; obtaining a deformation feature space and a deformation liquid level line feature sequence of the target container at different time points by means of a spatial-temporal feature extraction model, and constructing a three-dimensional dynamic deformation model in combination with three-dimensional modeling, finite element analysis and a NeoHookean model; based on the model, an undeformed standard model and a simulation algorithm, obtaining a correlation mapping function of the liquid level line deviation and a deformation characteristic space; the correlation mapping function is fed back to the spatial-temporal feature extraction model, the height and coordinates of the corrected deformation-free liquid level line are obtained in combination with the real-time target container deformation image, real-time monitoring and early warning in the infusion process are finally achieved in combination with a preset early warning rule, and the accuracy and reliability of infusion monitoring are improved.

The invention relates to the technical field of optical element surface shape dynamic measurement scheme design, in particular to an element surface shape dynamic measurement system based on a metasurface. According to the scheme, polarized light emitted by a laser is split into reference light and test light, the test light passes through a quarter-wave plate twice to realize polarization orthogonalization, and the test light is combined with the reference light to form elliptically polarized light; synchronously capturing component intensities of left-handed / right-handed circular polarized light and orthogonal line polarized light by using a detector, and resolving a phase difference delta in real time by combining a Stokes parameter; environmental interference is eliminated based on a common-path design, a polarization beam-splitting element is omitted, and the architecture is simplified; accurate dynamic measurement of the surface shape of the measured piece is realized by deducting the inherent surface shape error of the system. The system provided by the invention has the advantages of strong anti-interference performance, high measurement efficiency, remarkable cost reduction and the like, and is suitable for precise optical manufacturing and on-line detection scenes.

The invention discloses a method and a device for determining liquid crystal phase compensation of silicon-based liquid crystal. The method comprises the following steps: respectively representing a first polarization state and a second polarization state according to a first Mueller matrix of the silicon-based liquid crystal in a modulation state, a second Mueller matrix of the silicon-based liquid crystal in a non-modulation state and a Mueller matrix of the liquid crystal phase compensation unit; establishing a first contrast evaluation function according to the first polarization component in the first polarization state and the second polarization component in the second polarization state; converting independent variables in the first contrast evaluation function from the azimuth angle and the ellipsometry into the optical axis azimuth angle and the phase delay degree according to the characterization relation to obtain a second contrast evaluation function; and obtaining a target optical axis azimuth angle and a target phase delay degree according to the second contrast evaluation function, so that liquid crystal phase compensation parameters are quickly determined, and the contrast of an LCOS light machine in a bright field and a dark field is improved.

The invention discloses an electric orthogonal polarization synchronous control system of a geological microscope. The electric orthogonal polarization synchronous control system comprises six modules including a stokes parameter dynamic sensing unit based on multi-dimensional space vector transformation and a polarization mode dispersion feature extraction unit fusing adaptive weight distribution. The system captures original signals of polarized light through a high-frequency sampling circuit, generates corresponding compensation parameters according to actual parameters of the geological microscope through feature extraction and parameter calculation, generates driving signals in combination with dynamic threshold adjustment, drives an electric polarization component, and ensures control accuracy through closed-loop feedback adjustment. And each unit is also subdivided into functional subunits, such as mapping model updating, threshold acquisition and the like, so that self-adaptive optimization is realized. The multi-modal data interaction and cooperative control unit guarantees data interaction and overall cooperation of all the modules, the system solves the problems that traditional manual adjustment is low in efficiency and poor in precision, and an existing automatic system is insufficient in polarization mode dispersion processing, and the observation performance of the geological microscope is improved.

The invention discloses an anti-adhesion polaroid manufacturing process in the technical field of polaroids, and the anti-adhesion polaroid manufacturing process comprises the steps that a PMMA film containing smooth particles is prepared, the PMMA film comprises a base material face and a primer face opposite to the base material face, and the base material face and the primer face form a uniform microscopic protruding structure through the smooth particles; compounding the PMMA film with a stretched and dyed PVA film through a photocuring adhesive laminating process to form a polarizing film comprising the PVA film, the PMMA film and a TAC film; coating a pressure-sensitive adhesive on the surface of the compounded polarizing film, and compounding a protective film and a release film; according to the manufacturing process, the steps of attaching and tearing off the PE protective film are omitted; according to the invention, the uniformly distributed AB smooth particles form a protruding structure to reduce the friction coefficient, and the steps of attaching and tearing off the PE protective film are omitted, so that the production cost is effectively reduced, the production efficiency is improved, the abnormal gluing is avoided, and the practical value is remarkable.

In some implementations, an optical system for LIDAR sensing includes a transmitter configured to transmit a beam; a polarization beam splitter configured to block a first polarized transmission component of the beam and pass through a second polarized transmission component of the beam; a waveplate configured to convert the second polarized transmission component of the beam to a circular polarization state and to direct the beam toward a target, wherein the waveplate is configured to receive a return reflection of the beam and convert the return reflection to a second polarized reflection component, and wherein the polarization beam splitter is configured to reflect the second polarized reflection component and pass through a first polarized reflection component of the return reflection; a linear polarizer configured to pass through the second polarized reflection component; and a coherent receiver configured to receive the return reflection from the linear polarizer.