278 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.

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.

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 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 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 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 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 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.

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 discloses a high-precision non-contact measurement method for the size of a large part of a steam turbine and a measurement system for implementing the method, and belongs to the technical field of size measurement of the large part of the steam turbine. The method solves the technical problems that an existing method for measuring the size of a large part of a steam turbine is relatively traditional, depends on manpower to a large extent, and cannot meet the requirements for high precision and digital automation of measurement at present. Comprising the following steps: arranging a measurement system; laser scanning measurement equipment is arranged at one axial end of the to-be-measured large part; laser emitted by the laser scanning measurement equipment is reflected by the plane mirror by using a movement mechanism and then can irradiate a surface to be measured; determining the spatial position of the plane mirror in the current attitude; obtaining mirror point cloud data; converting and calculating the mirror point cloud data into entity point cloud data; and calculating to obtain the size of the to-be-measured steam turbine large part. And the accessibility of laser measurement is improved. The method is used for measuring the sizes of the large parts of the steam turbine.

The application discloses a laser converging system, a laser welding system and a laser welding machine, and relates to the technical field of optical converging. The laser converging system converts the preset S polarization laser beams sent by a laser device into two S polarization beams, and then into two P polarization beams through a plane mirror, an S polarization beam splitter, a first controlled mirror and a second controlled mirror arranged in the same XY plane, and converges the first light path and the second light path corresponding to the two P polarization beams at a preset space point outside the XY plane, so that the imaging light path for observing the converging conditions of the P polarization beams is designed outside the XY plane where the laser transmission light path is located, the mutual interference between the laser transmission light path and the imaging light path is avoided, and the control precision of the laser convergence is improved.

The present application relates to optical detection device and method, specifically to a kind of snapshot point source encoding wave front detection system and method.For solving the deficiency of poor stability, complex system and delay in prior art by using phase recovery method to realize optical system aberration inversion, a kind of snapshot point source encoding wave front detection system of the present application, including first light source module, second light source module, first beam splitter, second beam splitter, microscopic objective, first plane mirror, first imaging lens, polarized camera, first light source module and second light source module are respectively used to provide first linearly polarized light and second linearly polarized light with orthogonal polarization direction, first linearly polarized light is focal plane parallel light, and second linearly polarized light is off-focus parallel light.Based on the above system, a kind of snapshot point source encoding wave front detection method of the present application includes system calibration, system adjustment, image acquisition and pre-processing and wave front inversion etc.

This invention provides a catadioptric shortwave infrared imaging spectrometer, comprising, in order of light incidence, an entrance slit, a plane mirror, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a grating, and an imaging sensor. The plane mirror, together with the upper portions of the first, second, third, fourth, fifth, sixth, and seventh lenses, forms a collimation system. The grating, together with the lower portions of the seventh, sixth, fifth, fourth, third, second, and first lenses, and the imaging sensor, together form an imaging system. Collimation and imaging share a single lens group, resulting in a compact structure, easier aberration correction, simpler assembly and adjustment, better image quality, lower tolerance sensitivity, and reduced assembly difficulty.

The invention discloses an antenna reference mirror coordinate system measurement calibration method and an antenna assembly precision measurement method, and the calibration method comprises the steps: 1, determining the normal direction of the mirror surface of each reference mirror through employing the optical imaging principles of reflection and plane mirrors; step 2, carrying out point position measurement on the three orthogonal surfaces of the reference mirror through a laser tracker to obtain a three-dimensional coordinate of the geometric center of the reference mirror; step 3, determining a third axial direction of the reference mirror coordinate system, establishing the reference mirror coordinate system, and establishing conversion parameters of the reference mirror coordinate system; step 4, establishing an antenna coordinate system on the basis of the measurement coordinate system of the laser tracker; determining conversion parameters of an antenna coordinate system relative to a laser tracker measurement coordinate system; and step 5, obtaining calibration parameters of the reference mirror coordinate system relative to the antenna part assembly mechanical structure coordinate system according to the results of the step 3 and the step 4. According to the invention, the precision and reliability of the measurement process are improved on the basis of improving the calibration efficiency and saving resources.

The invention discloses an image motion compensation method based on a grooved cam, and the method comprises the steps: firstly, determining the target angular velocity of a plane mirror based on the input angular velocity, carrying out the interval division of a compensation period, setting an extension path, a far stop, a return path and a near stop, and carrying out the image motion compensation of an imaging system during the exposure integration period, an equal-acceleration section, a constant-speed section and an equal-deceleration section are arranged in the extending stroke section; then, obtaining a matching relation between the exposure integral time of the camera and a constant-speed extending stroke section according to different internal and external trigger modes; secondly, constructing a lift function to determine a cam profile, generating a cam theoretical pitch curve, and performing normal equidistant correction to obtain an actual groove profile; and finally, obtaining a direct mapping relation between the rotating speed of the plane mirror and the rotating speed of the groove cam through a mechanism motion transmission relation, so that a visual axis which is output in an exposure period and is opposite to an image motion direction is slightly deflected to restrain the image motion. The method is high in real-time performance, does not need complex control, and is good in compensation synchronism and repeatability.

The invention discloses a high-precision plane mirror pose precision adjusting device, which comprises a base, an orientation adjusting mechanism, a pitching adjusting mechanism, a mirror chamber and a three-point gap eliminating mechanism, and is characterized in that each of the orientation adjusting mechanism and the pitching adjusting mechanism comprises a driving assembly and a linear sliding block; the linear sliding block is connected with the execution component through the three-point type gap eliminating mechanism, and the three-point type gap eliminating mechanism comprises an adapter, a fisheye bearing connecting lead screw, a plug screw, a locking nut and an adjusting gasket and is used for eliminating radial and axial gaps at the connecting position at the same time. According to the invention, the high-performance transmission chain is combined with the three-point gap elimination mechanism, and the standard plane mirror is used as an optical function carrier of the system, so that the micro-arc-level angular displacement adjustment precision is realized. Theoretical calculation verifies that the azimuth adjustment resolution and the pitching adjustment resolution are both superior to 0.5 mu rad. The device has the excellent characteristics of gapless transmission, motion decoupling, micro-vibration resistance, long-term stable work and the like.

The dual-mode optical lens comprises a positive lens, a negative lens, a first turning mirror, a second turning mirror, a third turning mirror, a fourth turning mirror, an optical sensor and a machine shell, a linear sliding table is fixedly installed in the machine shell, and a moving part of the linear sliding table is in transmission connection with an installation frame; a second light hole is formed in one side of the top end of the mounting frame, a first light hole is formed in the bottom end of the other side of the mounting frame, the positive lens, the negative lens and the second light hole are located on the same horizontal line, and the first light hole and the light sensor are located on the same horizontal line; through the combination of the negative lens and the positive lens, a long focal length is realized under a relatively short optical path length, a more compact distance is realized through the two small-incidence-angle plane turning mirrors, and the two plane reflecting mirrors are combined and inserted into an optical path between the positive lens and the negative lens, so that light rays do not pass through the negative lens, and the optical path is more compact. And a relative small focal length light path corresponding to the positive lens directly reaches the sensor.

An off-axis single-grating multi-pass pulse compressor disclosed by the present invention comprises a compression module and at least one group of mirror groups, the mirror groups are used for increasing dispersion compensation of the compression module, and the compression module comprises a D-shaped reflector, a grating, a plane reflector, a first horizontal mirror and a first high-low mirror. Each group of mirror group comprises two mirrors, one mirror of each group of mirror group is located at the laser output end of the compression module, and the other mirror of each group of mirror group is located above the first high-low mirror, or the other mirror of each group of mirror group is located above the second high-low mirror. And the other mirror of each mirror group is positioned on one side of the first high-low mirror and has the same height with the horizontal plane. According to the off-axis single-grating multi-pass pulse compressor, a multi-pass single-grating compressor can be achieved, the total dispersion compensation amount is greatly increased, the advantages of low cost and small size of a transmission-type single-grating compressor can be reserved, and the compression requirement of ultra-large chirped pulses can be met.

The utility model belongs to the field of photoelectric sensor manufacturing, and particularly relates to a light sensor facilitating CMOS position adjustment, which comprises a hollow U-shaped shell, an opening of the U-shaped shell is parallel to a plane where a U shape is located, and two U-shaped inner side walls of the U-shaped shell are respectively provided with a light outlet and a light inlet. The axis of the light outlet and the axis of the light inlet are both parallel to the U-shaped bottom wall of the U-shaped shell, a light-emitting lamp panel is arranged in one U-shaped leg of the U-shaped shell, a plane mirror, a CMOS sensor and a convex lens are arranged in the other U-shaped leg of the U-shaped shell, and the convex lens is located between the plane mirror and the CMOS sensor. Light emitted by the light-emitting lamp panel enters the light inlet from the light outlet and then can penetrate through the convex lens to reach the CMOS sensor, the side, back on to the convex lens, of the CMOS sensor is connected with the inner side wall of the U-shaped shell through a spring, and the CMOS sensor can be fixed in the U-shaped shell through the fixator. The problem that the assembling efficiency is low is solved.

The utility model discloses a multi-leg plane mirror which comprises a plane mirror body and a supporting frame installed at the bottom of the plane mirror body, the supporting frame comprises two side edge supports arranged in parallel, the side edge supports are of an inverted V-shaped structure, and the opposite sides of the two side edge supports are both vertically and fixedly connected with positioning plates. The plane mirror is installed between the two positioning plates, a positioning installation structure is arranged between the plane mirror and the positioning plates, and a connecting frame is further fixedly connected between the bottoms of the two side edge supports. Two virtual images formed after an object is reflected twice by the plane mirror almost completely coincide, the imaging effect is obvious, the used material is firm and cannot be broken, hands cannot be stabbed, the safety is improved, a picture can be drawn from one side of the plane mirror to the other side of the plane mirror, the straight line is set as the position of the plane mirror, and it is guaranteed that the plane mirror is accurately positioned during a plane mirror imaging experiment.

This invention discloses a multi-view fruit quality detection method, apparatus, system, medium, and product. The method includes acquiring a multi-view composite image of the fruit to be detected, wherein the composite image is obtained by stitching together sub-images from multiple perspectives. These sub-images include directly captured images of the actual fruit and virtual images resulting from one or more reflections by a plane mirror. A pre-trained target detection network model is used to detect the sub-images, obtaining detection results for each sub-image. These detection results include the predicted bounding box, confidence score, and single-view quality normalization score of the fruit in each sub-image. The single-view quality normalization scores from the detection results of each sub-image are then fused using a multi-view method to obtain a multi-view quality normalization score. This invention aims to achieve multi-view fruit quality detection to obtain consistent, multi-view fruit quality detection results.

The present application belongs to the technical field of wavefront distortion measurement, and particularly relates to a wavefront distortion measurement system and method caused by light field waist spot mismatch in a cavity enhancement system. In order to accurately capture the wavefront distortion signal caused by light field waist spot mismatch, an electro-optic modulator (EOM), a convex lens, a three-mirror ring cavity, a plane mirror, a multi-quadrant detector (MPD) and a frequency mixer are sequentially arranged on the outgoing light path of the laser. Through light field modulation, resonance amplification, phase-locked demodulation and quantitative calculation, an error signal reflecting the distortion degree of two types is extracted, the minimum measurable waist spot size and position change are derived, accurate feedback is provided for long-term stable locking of the optical cavity, additional distortion interference caused by the thermal effect of the laser is compensated, and the measurement accuracy and stability of the system are improved.

The invention belongs to the technical field of teaching equipment, and particularly discloses a demonstration platform for teaching management, which comprises a guide box, a vertical rod, a guide rod, an observation cylinder, a first plane mirror and a second plane mirror, and is characterized in that the bottom of the vertical rod is in horizontal sliding fit with the guide box, and the upper part of the vertical rod is axially and slidably sleeved with a second sliding pipe; a second spring is arranged between the second sliding pipe and the lower part of the vertical rod; a first sliding pipe is transversely fixed to the surface of the second sliding pipe, a guide rod penetrates out of the first sliding pipe and is in axial sliding fit with the first sliding pipe, a third spring is arranged between one end of the guide rod and the first sliding pipe, and the other end of the guide rod is connected with an observation cylinder; the first plane mirror is connected with the top end of the observation cylinder, a second plane mirror is obliquely installed in the observation cylinder, and the observation cylinder, the first plane mirror and the second plane mirror jointly form a periscope structure. The movable teaching aid can move near a computer row, so that more students can see the teaching aid in the process of explaining and demonstrating the students by a teacher, and problems of the students can be explained in a targeted manner.

The application discloses a multi-mode vortex laser with adjustable order, comprising: a cavity lens coated with a laser wavelength anti-reflection film system, a first laser output mirror and a second laser output mirror, both of which are plane mirrors, and both of which are coated with a film system partially transmitting laser wavelength on one side and an anti-reflection film system for laser wavelength on the other side; a high-order Laguerre-Gaussian beam is focused by the cavity lens, and the focused beam waist positions of each-order Laguerre-Gaussian mode vortex light are separated under the action of spherical aberration of the cavity lens, and the higher the mode order and the larger the spot size, the closer the focused beam waist of the mode to the cavity lens; the positions of the first laser output mirror and the second laser output mirror are adjusted so as to be located at the waist positions of a certain mode, and the first laser output mirror and the second laser output mirror located at different positions provide feedback for two different-order Laguerre-Gaussian mode vortex lights, so that multi-mode vortex laser oscillation and output are formed.

This invention proposes a micro-nano arc-scale three-dimensional angle inspection device and method. The device comprises a ribbed worktable, a worktable shaft, a worktable support, a drive unit, a base, a plane mirror, an autocollimator, a drive module circuit board, a main control module circuit board, a display input module circuit board, and a turntable. The method uses the drive unit to induce a three-dimensional angle deflection in the worktable, employs two sets of autocollimation systems to measure this deflection, and establishes closed-loop feedback control for the worktable. Because the two angle measurement devices are orthogonally arranged, the three-dimensional angle deflection of the worktable can be measured. Using an autocollimation system as the angle measurement device greatly improves the angle measurement resolution. The combined drive method of a lead screw and piezoelectric ceramic further enhances the resolution of the worktable angle, thus solving the problems of small-angle inspection instruments being unable to perform three-dimensional angle inspection and having low angle resolution.