164 results about "Pentaprism" patented technology

The invention provides an adjusting and correcting method of a light path of a photoelectric system tracking-pointing precision measuring device. The measuring device is mainly composed of an opticalplatform, a laser light source, ground glass, a small-hole diaphragm, a beam splitter, a parallel light pipe collimating mirror, a high-frame-frequency CCD camera and the like, wherein the laser lightsource, the ground glass, the small-hole diaphragm, the beam splitter, the parallel light pipe collimating mirror, the high-frame-frequency CCD camera and the like are installed on the optical platform. By the adoption of a plane mirror, an optical autocollimation, a pentaprism and a theodolite, the positions of the laser light source, the small hole diaphragm and the high-frame-frequency CCD camera of the photoelectric system tracking-pointing precision measuring device are adjusted and corrected, the adjusting and correcting method has the advantages of being high in precision, easy to operate, convenient and visual, the problem of adjusting and correcting the light path of the photoelectric system tracking-pointing precision measuring device is solved, and not only is technological guarantee provided for the development of a space laser communication tracking-pointing technology, but also a reference basis is provided for designing a space laser communication system tracking-pointing precision measuring device.

The invention relates to a device and a method for detecting the surface shape of large-caliber plane optical elements, and belongs to a device and a method for detecting the quality of optical elements. The device and the method aim to solve the problems in the prior device and the prior method for detecting the large-caliber plane optical elements. The device comprises a stand, an image acquisition and processing system and a three-dimensional precision motion control system, wherein the three-dimensional precision motion control system comprises a vertical motion guide rail which is rotatably arranged on the stand, and a horizontal motion guide rail which can slide on the vertical motion guide rail; a rotary shaft which is fixed on the vertical motion guide rail is connected with a rotary power mechanism; and the image acquisition and processing system comprises a first scanning penta prism which is arranged on a slider of the horizontal motion guide rail, a first reference penta prism and a second scanning penta prism which are coaxially fixed with the horizontal motion guide rail, a second reference penta prism which is coaxially fixed with the vertical motion guide rail, and an optical head which is coaxially fixed with the horizontal motion guide rail. The device and the method can be applied to detection of the large-caliber plane optical elements, and are particularly suitable for online detection.

The invention discloses a photoelectric equipment multi-optical-axis parallelism quantitative detection device. The device comprises an off-axis folded aspheric optical system, a CCD image sensor, a two-dimensional translation bench, a double-pentaprism expanding assembly and a control system. The off-axis folded aspheric optical system forms a collimation parallel light tube. The two-dimensional translation bench is installed behind a housing. A cross scale surface of the two-dimensional translation bench is superposed with a focal plane of the parallel light tube. A transition prism group is arranged below an aspheric secondary mirror to realize light parallel inversion. The lens of the CCD image sensor is aligned to the transition prism group. A support group is installed on the housing. Two ends of a beam expanding guide rod of the support group are respectively provided with a pentaprism, and the relative distance between the two pentaprisms is adjustable. The device is capable of realizing quantitative and precise parallelism measurement of every two laser/infrared/white light optical axes of multi-band photoelectric equipment, is advantageous by being wide in spectrum range, high in measurement precision, miniature and portable, and is applicable to optical axis parallelism testing among multi-band photoelectric equipment.

Laser radar systems include a pentaprism configured to scan a measurement beam with respect to a target surface. A focusing optical assembly includes a corner cube that is used to adjust measurement beam focus. Target distance is estimated based on heterodyne frequencies between a return beam and a local oscillator beam. The local oscillator beam is configured to propagate to and from the focusing optical assembly before mixing with the return beam. In some examples, heterodyne frequencies are calibrated with respect to target distance using a Fabry-Perot interferometer having mirrors fixed to a lithium aluminosilicate glass-ceramic tube.

An apparatus for detecting spacing between a primary mirror and a secondary mirror, which comprises an auto-collimator, a pentaprism, a guide rail, a reticle, a CCD detection system and a monitoring computer, wherein the guide rail is arranged in parallel direction of vertical diameter of the primary mirror, the pentaprism is arranged at the guide rail and can be translated along the vertical direction, parallel rays emitted from the auto-collimator is turned 90 degrees via the pentaprism and then via telescope optical system to converge at primary optical axis, the reticle is arranged at Cassegrain focus, the CCD detection system is employed for image-forming of the parallel rays convergent point and the reticle, the monitoring computer is capable of calculating the centre of mass of the images detected by CCD detection system and obtaining a group of image points position, while another group of image points position can be obtained by moving the pentaprism, radial scanning of the primary mirror can be achieved by continue moving, and a movement path of the centre of mass of image points can be obtained, thereby spacing error between the primary mirror and the secondary mirror is obtained via processing of the monitoring computer. The apparatus achieves auto-detecting of the spacing between the primary mirror and the secondary mirror of the telescope, increasing the detecting accuracy, thereby providing important guarantee for later system adjusting of large telescope.

A stereoscopic camera for stereoscopic photography, which reduces losses in the screen when taking a picture in a close range and provides optimum stereoscopic effect without the need of adjusting the distance between the slides that are being mounted. A camera body is furnished with reflex finders constituted by a pair of right and left photographing lenses and pentaprisms. The distance between optical axes of the photographing lenses is adjusted by a horizontal shifting mechanism. Focusing plates of the right and left finders are marked with vertical lines at the centers and on the right and left sides thereof. The distance between optical axes is adjusted depending upon the distance to the subject and vertical lines of the right and left focusing plates are brought into agreement. Then, the right and left photographing areas are nearly brought into agreement on the real screen and no loss occurs on the screen.

The transmitter has a generally flat, circuit board stator, a rotor including a plurality of magnets mounted in a ring around a central opening, and a bearing, supporting the rotor for rotation about an axis that extends through the central opening, A pentaprism assembly including an optics holder is mounted on the rotor for rotation therewith. The pentaprism assembly receives a beam of laser light through the central opening and redirects at least a portion of the laser light outward in a direction normal to the rotation axis. A laser source, mounted on the stator, provides a beam of laser light through the central opening to the pentaprism assembly. The beam of laser light is aligned with the rotation axis. The laser source includes a collimating lens positioned within the rotor. A shield plate of magnetic material beneath the stator exerts a force on the rotor in conjunction with the magnets, taking play out of the bearing. The transmitter uses Hall effect sensors on the stator to control switching current to coils on the stator. The transmitter also uses the outputs of the Hall effect sensors and a timer output to control dithering of the laser beam.

The invention provides an orthogonal double-pendulum shaft calibrating and debugging method as well as reflector assembling and adjusting method for laser processing. The calibrating method comprises the steps that a pentaprism is arranged at the intersection of the rotation axes of two pendulum shafts, and after the rotation axis of one of the pendulum shafts is reflexed by 90 degrees through the pentaprism, the actual included angle between the rotation axes of the two orthogonal pendulum shafts can be calibrated through an autocollimator arranged on the rotation axis of the other pendulum shaft. According to the orthogonal double-pendulum shaft calibrating and debugging method as well as reflector assembling and adjusting method for laser processing, special optical equipment do not need to be adopted when the actual included angle between the laser processing orthogonal double-pendulum shafts is calibrated, and the calibrating method is simple.

The invention relates to a large-caliber long-focus collimator focal point real-time monitoring system. A laser device of the system emits laser beams, and the laser beams are divided into two bunches of lasers through a laser beam splitter. The two bunches of lasers pass through a slit after being reflected by a semi-reflecting and semi-transparent lens, and then are reflected to a main lens of the collimator through a reflecting lens. The two bunches lasers reflected by the main lens are reflected four times in turnover mode by two pentaprisms, and then are reflected back through the main lens. The two bunches lasers pass through the slit again after being reflected by the reflecting lens, and pass through two sets of dialyte lenses behind the semi-reflecting and semi-transparent lens and are converged on a charge coupled device (CCD). A processor calculates the distance between two faculaes according to image data received by the CCD, and then size and direction of defocusing amount can be obtained. An emitting light path and a receiving light path are in the same plane, and relative positions of elements are easy to guarantee when the large-caliber long-focus collimator focal point real-time monitoring system is mounted so as to reduce mounting and adjusting difficulty of the whole system.

The invention discloses a pentaprism production process which solves the problem that a pentaprism does not meet requirements as an existing machining process is complicated and softening temperature is improperly controlled. The pentaprism production process includes the steps: (1) cutting raw materials into small glass blanks by a cutting machine; (2) grinding corners of the glass blanks; (3) coating boron nitride powder on the surfaces of the glass blanks; (4) feeding the coated glass blanks into a softening furnace for softening; (5) profiling the softened glass blanks in a profiling mould to form an initial product; (6) annealing the initial product. The annealing temperature is 10-20 DEG C lower than a glass softening point. The cutting machine is used for cutting the raw materials, the same sizes and weights of the glass blanks are effectively ensured, so that division and rolling procedures are decreased, manpower cost is greatly saved, and machining time is shortened.

The present invention discloses a pentaprism scanning detection method for an aspheric reflector. The method comprises: 1) arranging a device required for detection; 2) performing scanning detection of a single bus; 3) performing scanning detection of the next bus of the rotation angle a of the aspheric reflector after the scanning of the single bus is completed; and 4) performing detection data processing and fitting. All the angle differences are transited to the slope values of the corresponding positions of the reflective surface of the aspheric reflector, the slope values are fitted with the Zernike gradient polynomial, and the low-order surface-shaped error parameters of the aspheric reflector are obtained. The high-precision low-order surface-shaped error parameters of the aspheric reflector can be obtained.

The invention belongs to the technical field of optical precision measurement and relates to a measuring method of an ultralong focal length of a penta prism combination, and a measuring device thereof. The method integrates a penta prism focus fixing method and an ultralong focal length measuring technology of a composite lens and helps realize low-cost and high-precision ultralong focal length measurement of large-caliber lenses. The method helps transform a focus fixing process in an optical axis direction into a variance measurement process of an imaging position in a vertical optical axis direction by using the penta prism to refract an optical path, and is further combined with the ultralong focal length measuring technology of the composite lens to compress length of the optical path and improve measurement resolution. The measuring device comprises a light source, the penta prism, a reference lens, an alignment target, a CCD detector and a collimator mirror, has the advantages of simple optical path structure, less aberration introduced by an optical component, less systematic error, high measurement sensitivity, high resistance to ambient interference, and can be applied to detection of the ultralong focal length lens and high-precision focal length measurement during assembling an optical system.

The invention discloses an installing and adjusting method for a collimation type solar simulator optical system. A reference optical axis is established through a theodolite I and a theodolite II, and a pentaprism, a guide rail, a tool reflector and a laser device are matched to conduct installing and adjusting capable of guaranteeing optical axis consistency on a collimator objective, an opticalintegrator, a steering plane reflector, a spherical reflector and an ellipsoid collecting lens, and the light energy utilization rate and irradiation uniformity of a collimation type solar simulatorcan be effectively improved.

The invention discloses an erect image system and a binocular laser ranging telescope, wherein the erect image comprises a roof half pentaprism, a beam splitter prism and an isosceles prism; the beamsplitter prism is located between the roof half pentaprism and the isosceles prism, the beam splitter prism is formed by two rectangular prisms through agglutination, and an agglutination face of thetwo rectangular prisms is provided with a beam splitting film. The erect image system and the binocular laser ranging telescope provided by the invention are simple in structure and small in size, moreover, are convenient to use, can realize binocularly observing and aiming at a measured object, and while observing the object, can display distance to the measured object in real time in the field of view.

An optical assembly is provided for use with a laser alignment system that has a laser emitter and at least one photosensitive target. The optical assembly includes a right angle prism disposed for receiving an input beam produced by the laser emitter and first and second 90° pentaprisms disposed receiving the output from the right angle prism. The first and second 90° pentaprisms are oriented to produce first and second reflected beams that are parallel to one another. The optical assembly further includes first and second beam diverters disposed and oriented to receive the reflected beams from the first and second 90° pentaprisms and to produce first and second output beams that are mutually perpendicular. The first and second 90° pentaprisms may be see-through pentaprisms to produce a third output beam that is colinear or parallel with the input beam and perpendicular to the first and second output beams.

The invention relates to a Mach-Zundel type shearing waveform measuring system and a shearing waveform measuring method thereof. The system comprises an interference system consisting of an incident panel, an emission panel, a fixed seat, a first reflecting panel, a second reflecting panel, a third reflecting panel, a fourth reflecting panel, a first guide rail, a second guide rail, an imaging lens, an aperture and a CCD imaging instrument. An adjusting device for ensuring accuracy comprises an auto-collimation collimator tube, a first reflecting mirror, a laser collimating light source, a reference transmitting and reflecting mirror, a second reflecting mirror, a lens screen, a first pentaprism, and a second pentaprism. A control processing system comprises a piezo-electric controller and a computer processing system. The system and the method are suitable for measuring waveform with large aperture and under a diffraction limit, and particularly suitable for being used on a light source waveform with short coherent length. The system and the method can conduct dephasing processing, and are provided with an entire system for real-time adjustment and calibration.

The invention provides a detection system for a long-range optical surface profile. The detection system comprises a mobile optical head and an f-theta angle detection system. The mobile optical head consists of a tail fiber, a beam splitter, and a concave mirror, wherein the beam splitter and the concave mirror form an equivalent pentaprism. The mobile optical head is configured to emit an input light beam through the tail fiber, so that the light beam passes through the beam splitter and then enters a surface of a to-be-detected optical device; the light beam is reflected to the beam splitter by the surface of the to-be-detected optical device; the part of reflected light beam is reflected to the concave mirror by the beam splitter; and then the light beam is reflected to the f-theta angle detection system by the concave mirror along a direction perpendicular to a normal of a corresponding measuring point of the surface of the to-be-detected optical device, so that a measuring light spot is formed in the f-theta angle detection system. According to the invention, the number of reflection and transmitting optical devices causing errors can be reduced; a system error caused by horizontal movement of a measuring light beam during measurement of different angles can be reduced; and the measuring precision is improved.

A long trace profile provided by the present invention is used to carry out the profile detection on the surface of a to-be-tested optical device, and comprises a scanning optical head and a f-theta angle detection system. The scanning optical head comprises a surface light source, a beam splitter, a single-hole screen and a plane mirror. The surface light source is placed horizontally, the beam splitter is arranged below the surface light source aslant, the single-hole screen is attached to the bottom surface of the beam splitter tightly, and the plane mirror is arranged below the single-hole screen aslant and forms a dual-reflection surface of a similar pentaprism structure with the beam splitter. According to the present invention, a system error introduced by the lateral movement of a measurement light beam when different angles are measured is reduced, thereby improving the measurement precision.

The invention discloses a location fixture for a prism roof ridge as well as location and manufacturing methods thereof, and belongs to the technical field of optical prisms. The location fixture comprises a base plate, location triangular prisms and a roof ridge surface location block, wherein two location triangular prisms are arranged, oppositely arranged on the base plate, and form a V-shapedlocation groove; and the roof ridge surface location block is arranged above the location triangular prisms, and provided with a roof ridge location surface, and the roof ridge location surface is vertical to the end surfaces of the location triangular prisms and vertical to the upper surface of the base plate. The machining method for the prism roof ridge comprises the following steps: preparinga pentaprism blank at first, then locating a pentaprism through the location fixture, and then grinding two roof ridge surfaces separately to form the roof ridge. The location fixture disclosed by theinvention is especially designed for location during the pentaprism grinding for the roof ridge surfaces, capable of enabling the angle accuracy between the roof ridge formed by the two roof ridge surfaces and the rectangular side surface opposite to the roof ridge to be not easily reach a range of less than 30 seconds, and simple and rapid in location.

The invention relates to the technical field of collimator optical axis calibration, in particular to a large-aperture off-axis reflection type vacuum collimator optical axis calibration method and adevice, and solves the problems of low calibration precision and large machining workload. The method comprises the steps of using a collimator off-axis primary mirror as a reference mirror, and usinga large-diameter plane mirror and an interferometer for collimator debugging; removing the interferometer, a pentaprism I and a pentaprism II are arranged between the collimator off-axis main mirrorand the large-aperture plane mirror; and arranging a digital display auto-collimation goniometer corresponding to the pentaprism I and the pentaprism II, arranging a target plate of the collimator onthe focal plane of the collimator, and debugging the target plate based on the digital display auto-collimation goniometer, the pentaprism I and the pentaprism II until the debugging of the target plate is completed, thereby completing the calibration. According to the method, the collimator off-axis primary mirror is used as the reference mirror, the calibration precision makes a precision breakthrough compared with the prior art, the early-stage processing work is not needed, only the user site installation and adjustment are needed, and the operation is simple and rapid when the user site installation and adjustment are carried out.

The invention provides a laser space corner correction method based on double phase-sensitive detectors (PSDs), and belongs to the fields of measuring technologies and laser technology application. In the process of measurement, due to the fact that a space corner exists on a plane where a laser beam and a laser receiver are arranged, the space corner needs to be corrected to obtain a laser vertical incidence point coordinate. The laser space corner correction method based on the double PSDs mainly comprises a laser 1, a filtering piece 2, a pentaprism 3, a two-dimension PSD position transducer 4, a lens 5 and a two-dimension PSD position transducer 6. In the process of actual use, the space corner can be corrected by calculating position coordinates of light spots which is irradiated on the two-dimension PSD position transducer 4 and the two-dimension PSD position transducer 6, and then a coordinate of a point which is obtained by laser vertical incidence on the laser receiver.