513 results about "Plane mirror" patented technology

The utility model discloses an auxiliary cavity adjusting device for a laser gyroscope, which comprises a He-Ne laser, a collimation laser, an adjustable first reflecting mirror, a semi-transparent semi-reflecting mirror, a second reflecting mirror, a third reflecting mirror, an imaging mechanism and a light beam coincidence verification structure, and is characterized in that the collimation laser is arranged on the right side of a cavity to be adjusted and corresponds to a left upper plane mirror of the cavity to be adjusted; the first reflecting mirror and the third reflecting mirror are located between the cavity to be adjusted and the collimating laser, the semi-transparent and semi-reflecting mirror is located between the second reflecting mirror and the He-Ne laser, the light beam coincidence verification structure is movably located between the semi-transparent and semi-reflecting mirror and the second reflecting mirror, the He-Ne laser is located right above the collimating laser, and the He-Ne laser is located right above the collimating laser. The semi-transparent semi-reflecting mirror is located over the first reflecting mirror, the second reflecting mirror is located over the third reflecting mirror, and the imaging mechanism is located on the right side of the cavity to be adjusted and corresponds to a left lower plane mirror of the cavity to be adjusted. According to the utility model, the cavity adjusting efficiency and accuracy of the laser gyroscope can be improved.

The invention belongs to the field of solar photovoltaics, and provides a CCLFR concentrating solar photovoltaic system and power generation equipment. The CCLFR concentrating solar photovoltaic system comprises a CCLFR concentrator, a supporting structure and PV assemblies which are arranged from bottom to top, wherein the PV assemblies are symmetrical left and right; the CCLFR condenser is of an axisymmetric structure and is a condensing mirror field formed by alternately arranging a plurality of plane mirrors; each plane mirror is used for reflecting incident light to the surface of the corresponding PV assembly; wherein the layout of each plane mirror is related to the width of the battery, the placement height of the photovoltaic battery, the inclination angle of the photovoltaic battery, the inclination angle of the mirror surface, the X-axis coordinate value of the mirror surface end point, the included angle between the reflection light of the mirror surface end point and the X axis, the width of the mirror surface, the width of the mirror field and the transverse distance between two adjacent mirror surfaces.

The invention belongs to the field of optical detection, and particularly relates to a synchronous calibration method for a geometric pose and an optical axis error of a reflective phase deflection system, which comprises the following steps of: taking a plane mirror pose as a reference, establishing redundant geometric constraints under a plurality of poses through mirror image reflection, and jointly solving geometric external parameters of the system; and meanwhile, a reverse ray tracing model and a normal integral model are synchronously constructed in a calibration stage, surface shape data are actually measured by combining an interferometer, a system optical axis error field is explicitly stripped, and decoupling separation of a system structure error and a surface shape error is realized. According to the method, the system building process is greatly simplified, the dependence of a high-precision mechanical auxiliary device is avoided, and the overall detection precision and the low-frequency error control capability of the reflective phase deflection system are effectively improved by synchronously modeling and compensating the optical axis error of the system in the calibration stage; and a technical basis with engineering adaptability is provided for high-precision free-form surface optical detection.

According to the splicing type Ritchey-Common detection method and system based on neural network model training, the sensitivity rules of aberration orders and Ritchey angles are combined, angle differentiation configuration is combined with reconstruction of the marginal area weight through a fusion detection model, and therefore on the premise that no sensitive blind area exists, the detection accuracy is improved, and the detection efficiency is improved. The influence of weak edge aberration signals is counteracted, so that the deviation between the detection precision of the edge region and the central region can be remarkably reduced, full-order high-precision detection of large-aperture plane mirror aberration is realized, particularly, the detection precision of the edge region aberration is remarkably improved, and the detection precision of the large-aperture plane mirror aberration is improved. The problems that in a traditional method, the precision deviation between an edge area and a center area is large, and full-order aberration coverage is insufficient are solved.

The invention discloses a surface topography measurement device and method based on polarization phase shift. The device comprises a laser module, a polarization beam splitting and interference module, a polarization beam combining and imaging module, a polarization image acquisition module and a control and reconstruction module. The laser module comprises a monochromatic tunable laser, an optical fiber collimating amplifier and a polarizer; the polarization beam splitting and interference module comprises a polarization beam splitting prism, a first quarter-wave plate, a plane mirror and a second quarter-wave plate; the polarization beam combining and imaging module comprises a polarization splitting prism, a third quarter-wave plate and a telecentric lens; the polarization image acquisition module comprises a micro-polarization array camera and an image processing unit, and the micro-polarization array camera synchronously acquires four polarization interference images through single exposure; and the control and reconstruction module obtains measurement data of the surface topography of the to-be-measured object through a phase unwrapping algorithm and three-dimensional topography reconstruction. According to the invention, high-precision, large-field-of-view, portable and high-efficiency field detection can be realized.

Polarization BRDF characteristic measuring device and method, belong to optical measurement technical field, the present application is to solve the existing BRDF or polarization BRDF measurement slow, low efficiency problem of measurement.The scheme of the present application: the laser light source at the second focal point emits laser light vertically through the circularly polarized light generating system and the polarizing system, the circularly polarized light generating system converts the laser light emitted by the laser light source into circularly polarized light, the polarizing system quantitatively changes the polarization state of the circularly polarized light to form the measuring incident light, the incident light is transmitted through the transmission light of the half mirror, and is reflected by the ellipsoidal mirror to the surface of the sample to be measured at the first focal point, the reflected light wave of the surface of the sample to be measured is reflected again by the inner surface of the ellipsoidal mirror, and is transmitted to the second focal point direction and is reflected by the half mirror, and the reflected light wave is converged to the third focal point of the measuring system through the polarizing system, the polarizing system is adjusted with the polarizing system, and the polarization BRDF characteristic of the sample to be measured is measured.

The invention belongs to the technical field of reflector production, and particularly relates to a lifting sheet taking table structure for mirror plating sampling inspection of a plane reflector, which comprises a lifting mechanism, a lifting mechanism, a conveying mechanism and a steering mechanism, the lifting mechanism is used for controlling the height of a reflector to be sampled during discharging and comprises a base and a lifting table located above the base in a lifting mode. The lifting mechanism is used for lifting a reflector to be subjected to spot check and comprises at least two U-shaped frames which are arranged above the lifting table at equal intervals and arranged in a transverse row, and rotating shafts are rotationally arranged on the inner sides of the U-shaped frames through bearings. The multi-direction discharging device can achieve multi-direction discharging, does not need a plurality of conveying devices, can directly adapt to multi-station sampling inspection or emergency discharging requirements, reduces equipment investment, is compact in layout, reduces occupied space, integrates a lifting mechanism, a lifting mechanism, a conveying mechanism and a steering mechanism on the same base, simplifies control logic, reduces operation difficulty and improves production efficiency. And the transportation stability of the reflecting mirror is improved.

The invention discloses a wide-temperature-range adaptive medium-wave infrared slit-free spectrometer, and solves the technical problems that the energy consumption of the slit-free spectrometer is high and the size and the weight are difficult to miniaturize due to the fact that an integral refrigeration method needs to depend on large refrigeration equipment in the prior art, and the imaging quality of the slit-free spectrometer is seriously deteriorated due to a local refrigeration method. Comprising a front telescope system group, a light splitting system group, a plane mirror, a relay system group and a refrigeration type detector optical system group which are sequentially arranged along the propagation direction of an object space imaging light beam. The movable distance of the detector is set in the range, so that the slit-free spectrometer adapts to the change of the temperature gradient of the first temperature interval and the second temperature interval in the range, and the imaging quality is high.

The application provides a high-precision autocollimator based on the Tyman Green interference principle and an angle measuring method, aiming at solving the problem that the prior art cannot continue to break through the existing angle measuring precision due to the limitation of geometric optical principle and the influence of environmental factors. The autocollimator comprises a laser, a filtering collimation module, a beam splitter, a reference mirror, a plane mirror, a detector and a data acquisition and processing computer. After the autocollimator is leveled, the plane mirror is placed on a turntable to be measured, and the measurement is carried out when the turntable has no rotation angle and has a rotation angle, so that the laser is emitted to the filtering collimation module to be emitted as monochromatic parallel light to the beam splitter and is divided into two paths. One path is reflected by the plane mirror and then passes through the beam splitter to reach the detector again. The other path is reflected by the reference mirror and then reflected by the beam splitter to reach the detector again. The two beams interfere on the target surface of the detector, the detector records the interference image and uploads it to the computer to calculate the interference fringe offset, so that the angle measurement is completed.

The invention relates to the technical field of medical instruments, in particular to a double-sided anti-fog amplification mouth mirror which comprises a mirror body, a rotary connecting mechanism, a micro-channel cleaning system and a handle assembly. A lens main body is formed by fixing a plane mirror (A surface) and an aspheric magnifying lens (B surface) in a back-to-back manner, and a steering engine drives a central connecting rod to realize quick switching of double functions. The lens body is further provided with a heating anti-fog module, the micro-channel system is integrated in the lens frame, the annular distribution cavity is of a double-layer independent structure, the upper layer is communicated with the inclined spraying holes, normal saline is directionally sprayed for preventing fog and removing dirt, and the surface of the lens body is clear through heating of the heating anti-fog module. And the lower layer is communicated with a suction hole to recycle dirt under negative pressure. The handle is integrated with a control button, a foot switch controls washing / suction separately, and single-hand operation is achieved. The problems of view limitation, mirror surface fogging, pollution and single function are systematically solved, and the diagnosis and treatment efficiency and accuracy are remarkably improved.

The invention relates to a visual and optical feedback combined optical element rapid alignment method and device, and the method comprises the steps: plane mirror alignment and beam splitter prism alignment, the plane mirror alignment establishes a reference optical axis for beam splitter prism alignment, and visual feedback coarse alignment and optical feedback fine alignment are successively adopted in the two stages. During visual feedback coarse alignment, the inclination angle of the plane mirror or the beam splitter prism is calculated and adjusted according to the coordinates of light spots on the imaging screen, so that the light spots return to the target center or coincide with the target center; during optical feedback fine alignment, spiral gradient rising is adopted to search and adjust the inclination angle of the beam splitter prism, so that the reflected light intensity is maximum. The alignment device comprises a clamp which is used for fixing a gradient refractive index lens and is provided with an imaging screen in the direction of a light emitting surface, a side surface imaging device, a first rotating platform fixed with a plane mirror, a second rotating platform for clamping a beam splitter prism and the like. By utilizing the method and the device, the alignment precision and the alignment efficiency of the gradient refractive index lens, the beam splitter prism and other optical elements can be improved.

The invention discloses a double-optical-path long-optical-path gas absorption cell which comprises a first light source, a second light source, two sets of spherical reflectors, two sets of plane reflectors, a roof prism, a triangular reflector, two sets of narrow-band optical filters and two sets of detectors. All the components are arranged perpendicular to the XZ plane, the light source is located above the first spherical reflector and arranged on the two sides of the sphere center, the concave faces of the spherical mirrors are relatively parallel, the plane mirrors are obliquely parallel, and the prism is correspondingly matched with the optical filter and the detector. The double light paths can adopt the same light source to split beams (improve the detection sensitivity) or light sources with different wavelengths (synchronously detect various gases), the light beams are anticlockwise reflected for multiple times in the cavity to form a long light path, and light spots are distributed in a semi-ellipse manner. According to the invention, the spherical mirror does not need to be punched, the processing and coating difficulty is reduced, the debugging error-tolerant rate is improved, the long optical path and miniaturization are both considered, and the method is suitable for related gas detection scenes of the TDLAS technology.

The invention discloses an alignment method for a resonant cavity of a beam-expanding telescope, and relates to the technical field of beam-expanding telescopes. The method comprises the following steps: when no beam expander exists, enlarging the plane mirror to maximize the power of the through hole diaphragm and make the through hole diaphragm vertical to a light beam; and adjusting the third reflector to the CCD to form circular interference to obtain a reference light path. After the beam expander is arranged, the first reflector and the second reflector are finely adjusted to enable the light beam to penetrate through the small hole again, the CCD reproduces the circular ring, and incidence-telescope axis alignment is completed; the first cavity mirror and the second cavity mirror are sequentially added, pitching / yawing fine adjustment is conducted, and circular ring interference is kept, namely resonant cavity alignment is achieved. The difficulty of parallel alignment between the input light beam and the optical axis of the telescope and the difficulty of alignment between the endoscope and the telescope can be effectively reduced.

The invention belongs to the technical field of package printing detection equipment, and particularly relates to package printing visual detection equipment which comprises a roller conveying belt, a detection box used for carton detection is arranged at the top of the roller conveying belt, and a visual detection mechanism used for synchronously detecting the top and the side surface of a carton is arranged in the detection box; when the carton enters a detection area, a printing pattern on the side surface of the carton is reflected to a plane mirror through two right-angle reflection prisms, an industrial camera photographs the reflected pattern, and meanwhile, the industrial camera photographs a printing pattern on the top of the carton through a first detection hole and obtains image information of the top and four side surfaces of the carton at the same time; according to the invention, the number of used industrial cameras can be reduced, the equipment hardware cost is reduced, and the tedious process caused by multi-camera calibration is avoided; in the detection process, the package does not need to be turned over, image information of multiple faces is obtained at a time through the reflection light path design, and the assembly line detection efficiency is improved.

The invention discloses an intermediate-frequency surface shape white light interference splicing measurement method based on polynomial filtering. The method comprises the following steps: carrying out white light interference splicing measurement on an X-ray plane mirror to obtain a group of interference measurement surface shape results with overlapped adjacent sub-aperture space positions; fitting the surface shape result of each sub-aperture by using a Legendre polynomial to obtain a polynomial coefficient under a preset order; fitting according to a polynomial coefficient to generate a fitting surface shape of a corresponding order, and subtracting the fitting surface shapes of all orders from the measurement result to obtain a group of surface shape results subjected to Legendre polynomial filtering; and splicing the filtered shape results according to a least square algorithm to obtain a final measurement result. The method aims at meeting the splicing measurement of sub-nanometer PV precision required by the intermediate-frequency surface shape error detection of the X-ray plane mirror, the least square optimization splicing method is used, the method is not limited by the low-frequency characteristic of the measurement error of the white light interferometer, and the precision and flexibility of the splicing measurement are improved.

A schlieren system for in-situ / online monitoring of spatter in a large-area melt pool is provided, including a parallel light generation part, a parallel light deflection part, and an image acquisition part. The system can monitor spatter and other physical phenomena in the melt pool in a process of multi-layer printing and adjust a monitored area during an experiment to expand a monitored range. A reflector group composed of a plurality of plane mirrors is arranged, such that an optical path can be kept away from powder and dust areas, avoiding interference between the schlieren system and inherent devices inside a build chamber. Communication between a laser path controller and an optical path deflecting mirror galvanometer motor controller is established to automatically control the plane mirrors to change the monitored area, automatically track the melt pool, and realize online monitoring.

The utility model discloses an automatic imaging device for detection, which comprises an imaging connecting structure and an imaging camera, the imaging connecting structure comprises a bottom plate, a first mounting seat and a second mounting seat which are sequentially connected from bottom to top, the first mounting seat and the second mounting seat are internally provided with vertically through cavities, the bottom plate is provided with an imaging hole, and the imaging hole is communicated with the first mounting seat and the second mounting seat. A cavity of the first mounting seat is internally provided with a first dichroic mirror and a spectroscope, one side edge of the imaging connecting structure is connected with an imaging light source structure, the other side edge of the imaging connecting structure is connected with an automatic focusing system, and the second mounting seat is internally provided with a first optical filter, a first lens group and a plane mirror which are sequentially arranged from bottom to top. The automatic imaging device has the beneficial effects that the two light sources can be conveniently and quickly switched, different detection requirements can be met, and the application range and the flexibility of the automatic imaging device are improved; each part adopts a modular design, the connection and communication logic is simple and clear, the complexity and the maintenance cost of the imaging device are reduced, and the stability and the reliability are improved.

The invention provides a hyperspectral imaging system. The hyperspectral imaging system comprises a telescope group, a collimator objective, a prism, a volume holographic diffraction grating, an imaging objective and an imaging sensor which are arranged in sequence, the telescope group is composed of a primary reflector, a secondary reflector, a third reflector, a plane reflector and an entrance slit; the primary reflector, the secondary reflector and the third reflector form an off-axis three-reflector structure; the plane reflector is used for folding a light path; the collimating objective lens, the prism, the volume holographic diffraction grating, the imaging objective lens and the imaging sensor form an imaging spectrometer, and an entrance slit is used as object space input; the formed off-axis three-mirror and folded light path and an imaging spectrometer are in coaxial butt joint by taking an entrance slit as a node, and are used for joint correction and splicing to form a hyperspectral imaging system. According to the optical path architecture, optimal matching of the unobstructed total reflection front end and the transmission type rear end is realized, and the detection sensitivity of crop weak spectrum signals is greatly improved while a better modulation transfer function of a full view field is ensured.

The invention relates to the technical field of physical performance detection, and provides a method and a system for measuring anisotropic shrinkage of glue based on CCD (Charge Coupled Device) vision. The method comprises the following steps: constructing a measuring system, wherein the measuring system comprises a laser, a plane mirror, a convex lens, a CCD camera and a mirror base for bearing glue to be measured; when the glue is not cured, collecting an initial light spot image through the CCD camera, and determining the position coordinates of the initial light spot on the CCD camera; in the glue curing process, dynamic light spot images are collected in real time through the CCD camera, and the light spot offset in the first direction and the light spot offset in the second direction in the glue curing process are calculated respectively; calculating the shrinkage rate of the glue in the first direction and the shrinkage rate of the glue in the second direction; and obtaining the anisotropic shrinkage rate of the glue according to the shrinkage rate in the first direction and the shrinkage rate in the second direction. The method accurately evaluates the anisotropic shrinkage characteristic of the glue.

This invention discloses a device, a microscopic imaging system, and an imaging method for rotating images. The device includes a mirror assembly and a rotating mirror located in the xy-plane. The rotating mirror's reflecting surface makes a 45° angle with the xy-plane, and its rotation axis is perpendicular to the xy-plane. The incident ray from the mirror assembly makes an angle α with the positive x-axis, and the outgoing ray makes an angle γ with the positive x-axis. The mirror assembly contains N plane mirrors, each with a reflecting surface perpendicular to the xy-plane, participating in ray reflection. The angles between the normals of their reflecting surfaces and the positive x-axis are θ1, θ2, ..., θ... N , (-1) N‑1 ×2θ1+(-1) N‑2 ×2θ² + … + (-1) N‑N ×2θ N +180°×|sin(Nπ / 2)|+(-1) N ×α=γ, the angle between the projection of the normal of the rotating mirror's reflecting surface onto the xy plane and the positive x-axis is β, β=-(180°-γ). After allocating the angle of the plane mirror according to γ, only the rotating mirror needs to be adjusted. Compared with existing technologies, this avoids the aberrations introduced by using thick glass, and the structure is simpler and the operation is more flexible.

The application discloses a kind of big field of view off-axis three-reflection beam expanding optical system's alignment method, when adjusting off-axis three-reflection beam expanding optical system using existing mode, it is solved that there is the problem of long alignment cycle and low alignment precision, the concave off-axis parabolic characteristics of off-axis primary mirror and off-axis three-mirror are used, and it is self-accurate detection using interferometer and self-accurate mirror;The relative position relationship of off-axis primary mirror and off-axis three-mirror can be determined using its focal point;Only need to adjust a specific optical element when adjusting system each time, without adjusting other optical elements simultaneously, greatly reduce the adjustment uncertainty;As can be seen, the alignment method of the application, the adjustment degree of freedom in the alignment process is reduced by half compared with existing experience method, realizes the controllability of off-axis type beam expanding optical system optical path alignment process, improves the alignment efficiency of optical system optical path.

The invention discloses a laser powder bed sheet pattern distortion real-time correction system and method based on a phase type light valve, and relates to the technical field of metal additive manufacturing. The system comprises a polarization laser, a beam expanding and collimating unit, a reflecting mirror, a phase-type spatial light modulator, a reflecting mirror, a relay optical system, a galvanometer / field lens system, a movable spectroscope, a reference plane mirror and a forming cylinder. A double-loop correction system with a position sensitive detector as an absolute reference and a wavefront sensor as direct feedback is constructed, information of the position sensitive detector and the wavefront sensor is unified in a phase domain through a frequency domain fusion algorithm, and a comprehensive compensation phase diagram capable of completing pattern generation and distortion correction at the same time is generated. And loading to a phase type light valve to carry out high-power laser patterning modulation, and melting metal powder of a powder bed.

A kind of telescope active optical correction system correction accuracy testing device, including laser interferometer, multidimensional adjusting table, wave aberration measurement component and plane mirror, laser interferometer is placed in the outside of optical telescope for emitting test light to the inside of optical telescope, to detect the wave aberration data of multiple fields of view;Multidimensional adjusting table is used to adjust the position, angle of optical element in optical telescope, to simulate the situation that telescope imaging quality drops;Wave aberration measurement component is set at the image plane of telescope for measuring the wave aberration after optical telescope imaging quality drops, and plane mirror is used to reflect test light.The present application relates to a kind of telescope active optical correction system correction accuracy testing method, the displacement amount and rotation angle of optical element when comparing when simulating image quality drop and when correcting judge the correction accuracy of active optical correction system, compare wave aberration before simulating image quality drop and after correction, judge whether the image quality after correction reaches the image quality before simulating image quality drop.

A handheld multifunctional industrial endoscope inspection device is characterized in that a limiting wheel is provided with a limiting hole, the upper end of an outer shell is provided with a damping rod matched with the limiting hole, a reflecting cover plate is provided with a reflecting mirror, the reflecting mirror comprises a concave mirror or a plane mirror, and the outer side of the reflecting cover plate is provided with a round hole and a rectangular hole in the width direction of the outer shell; a sliding rail and a reflecting plate sliding on the sliding rail are arranged in the reflecting cover plate, a first shifting block which penetrates through the rectangular hole and can slide in the rectangular hole is fixedly arranged on the reflecting plate, an auxiliary lamp reflecting plate and baffles are arranged on the inner side of the reflecting cover plate, and the baffles are located on the two outer sides and the middle of the reflecting cover plate respectively. The angle of the reflecting cover plate can be adjusted through the rotating shaft and the limiting wheel, so that the endoscope can meet the detection requirements of different depths and angles, the stability in the rotating process is guaranteed through cooperation of the limiting hole and the damping rod, meanwhile, certain resistance is provided, and it is guaranteed that an operator can accurately control the angle of the cover plate.

The application discloses a kind of automobile battery box weld seam air tightness detection device, is in the cylindrical shell setting light detection unit, including elastic mechanism as air leakage detection device, laser light source as the light source of detection unit exit laser beam;First plane mirror and elastic mechanism follow-up form reflecting surface, and laser beam forms reflected light through reflecting surface;Reflected light is projected on the detection surface of photoelectric detector by twice reflection of plane mirror, and obtains detection light position signal;By pressurizing, the air leakage hole of weld seam to be measured section in the battery box to be measured generates airflow, to be measured section weld seam is judged by the air leakage of the battery box to be measured whether or not by the corresponding detection light position signal in photoelectric detector and the pressurization value of battery box to be measured;Each weld seam to be measured section is detected gradually, and the air tightness detection of automobile battery box is realized.

The utility model provides an optical detection system. The optical detection system comprises: a vacuum chamber in which a sample to be detected is placed, the top of which is provided with a window; the plane mirror is arranged at the window to seal the window; the microscope is arranged outside the vacuum chamber; and the aberration compensation device is arranged between the microscope and the sample to be detected, comprises a first lens structure positioned above the plane mirror and a second lens structure positioned below the plane mirror, and is configured to reduce or eliminate aberration introduced by the plane mirror. According to the optical detection system provided by the utility model, aberration introduced by the plane mirror of the vacuum chamber window can be reduced or eliminated, and the detection precision and the detection efficiency of the optical detection system are improved; the device eliminates the limitation of the working distance of the objective lens on the thickness of the window plane mirror, is suitable for objective lenses with various working distances, and enlarges the application range.

The utility model discloses a plane mirror seat milling surface clamp, including base, adjusting structure, special-shaped clamping structure, backing plate and elevating structure, the top of base is equipped with the movable groove no. 1, adjusting structure is provided base top, special-shaped clamping structure is provided in the adjusting structure, backing plate is provided below special-shaped clamping structure, elevating structure is provided in the adjusting structure. Compared with the prior art, the special-shaped part clamping device has the advantages that the first arc-shaped block, the second arc-shaped block, the third arc-shaped block and the fourth arc-shaped block in the special-shaped part clamping structure are driven by the two mounting plates to be close to the two sides of the plane mirror base; angles of the first arc-shaped block, the second arc-shaped block, the third arc-shaped block and the fourth arc-shaped block are adjusted in the first arc-shaped groove, the second arc-shaped groove, the third arc-shaped groove and the fourth arc-shaped groove correspondingly, so that the edges of the special-shaped part are attached, and then the special-shaped part is clamped.

The invention relates to a photoacoustic liquid viscosity detection device and method based on spectrum resolution, and belongs to the field of photoacoustic detection and liquid physical property analysis. The device comprises a solid-state laser, a collimating lens, a plane mirror, a plate-type semitransparent mirror, a microscope objective lens, a photodiode, a photoacoustic coupling cavity, a rectangular prism group, an ultrasonic transducer, a pre-signal amplifier, a digital oscilloscope and a computer. Pulse laser is focused to a liquid sample after being processed by an optical path to excite a photoacoustic effect, an ultrasonic transducer receives a signal and converts the signal into an electric signal, after a digital oscilloscope synchronously samples, a computer extracts a frequency spectrum full width at half maximum (FWHM) through fast Fourier transform, and non-contact detection is realized based on a negative correlation between the frequency spectrum full width at half maximum and viscosity. The method can overcome the defects of large sample size, mechanical contact and the like of a traditional method, and is suitable for high-precision viscosity detection of biological tissues and industrial samples in the field of biomedicine.

This invention relates to a high-power, high-repetition-rate terahertz source generating device at room temperature with a capacity of hundreds of milliwatts, belonging to the field of nonlinear optical frequency conversion technology. It solves the problems of low terahertz conversion efficiency and the need for additional cooling equipment in existing technologies. The device comprises, arranged sequentially along the optical path: a pump laser for providing femtosecond pump laser light; a beam-expanding lens group for expanding the femtosecond pump laser beam to twice its original diameter; a plane mirror group for guiding the expanded pump laser; a first half-wave plate, a reflective diffraction grating, a gold mirror, and a third ultrafast mirror for adjusting polarization and diffraction reflection; a 4-f telescope imaging lens group for reducing the diameter of the received pump laser beam and imaging it onto a lithium niobate crystal; a lithium niobate crystal for generating terahertz pulse radiation perpendicular to the wavefront; a terahertz collection module for receiving and focusing the terahertz pulse radiation; and a measurement device for receiving and measuring the focused terahertz pulse radiation.

This invention discloses an absolute measurement device and method for the second-order term of the surface shape of an X-ray plane mirror. The device includes a clamping platform, an interferometer, and a rotating stage. The rotating stage has a rotatable mounting platform for the mirror under test and a reference mirror mounting plate. The mounting platform is positioned in front of the interferometer's plane lens to fix the X-ray plane mirror under test. The reference mirror mounting plate has a mounting platform for a reference mirror, on which a reference plane mirror is mounted. The reference plane mirror reflects the light reflected from the X-ray plane mirror under test back to the interferometer's plane lens to measure the surface shape of the mirror. This invention aims to achieve high-precision absolute measurement of the second-order term surface shape of an X-ray plane mirror, improve measurement accuracy, and provide guiding surface shape measurement results for the manufacturing of high-precision X-ray plane mirrors.