157 results about "Optical calibration" patented technology

In an optical system including an optical input port for projecting an input optical signal onto an optical phased matrix array, an optical phased matrix array including a plurality of individually addressable pixels thereon, each said pixel being drivable within a prescribed range of levels, and an optical output port for collecting a predetermined fraction of said optical signal received from said optical phased matrix array; a method of compensating for phase distortions including the steps of: (a) determining a plurality of transfer functions relating said level of each said pixel to the phase variation each said pixel introduces to light from said input optical signal which is incident thereon; and (b) controlling the level of selected ones of said pixels in accordance with a corresponding transfer function such that said fractional signal received at said output port is modified in phase to substantially compensate for optical phase distortions arising from said optical phased matrix array.

The invention discloses an electrical axis optical calibration system of a spaceborne microwave tracking-pointing radar and a calibration method of the electrical axis optical calibration system. The electrical axis optical calibration system comprises a radar testing subsystem, a calibration subsystem, a radar device and a target simulation subsystem. The target simulation subsystem comprises a target simulation source, a two-dimensional testing rotary table, a two-dimensional testing rotary table controller connected with the two-dimensional testing rotary table, a two-dimensional scanning frame and a target simulation horn antenna arranged on the two-dimensional scanning frame. The calibration method comprises the first step of calibrating the mounting precision of a radar antenna and a driving mechanism, the second step of calibrating the consistency of a radar electric axis and a radar antenna mechanical axis and the third step of correcting the radar according to a calibration result. According to the electrical axis optical calibration system of the spaceborne microwave tracking-pointing radar and the calibration method, high-precision calibration can be carried out on the radar in a compact field, the requirement of the radar for the temperature, the humidity and the cleanliness of used environment is met, the non-contact calibration of the spaceborne microwave tracking-pointing radar is achieved, the used measuring instruments are small in number and high in precision, the calculation of data can be automatically completed, and the high precision and the high reliability of the radar are guaranteed.

An apparatus and related method for optical calibration of spectrophotometers is described. The apparatus is a calibration plate including one or more cuvettes filled with solutions of interest. The cuvettes are sealed to prevent evaporation. The cuvettes also possess a compressible component to allow for expansion of the solution and a bubble control apparatus to ensure that the compressible component does not intersect the beam path. A piece of neutral density glass is optionally included in the apparatus to track optical changes of the solutions over time.

The invention discloses an optical calibration method of an ultrasonic probe. The optical calibration method of the ultrasonic probe includes the following steps: (1) pasting character identification points on the ultrasonic probe, (2) fixing a three-dimensional calibration template and optical positioning equipment, (3) and holding the ultrasonic probe in hand to scan the three-dimensional calibration template, obtaining a space gesture of the ultrasonic probe by using the optical positioning equipment at the time of every time gathering ultrasound images to obtain original data and calibrating the ultrasonic probe by using a least square method. Compared with a traditional electromagnetic calibration method, the optical calibration method of the ultrasonic probe has the advantages that calibration results are more accurate, due to the fact that in the process of calculation only an unknown number exists (an unknown transformation matrix), complexity of calibration calculation is reduced, the optical calibration method of the ultrasonic probe can be applied into various types of ultrasound probes, equipment is simple and convenient and range of application is wide. The optical positioning equipment is used for obtaining the gesture of the ultrasonic probe, influence of power cords is not needed to consider and calibration range is wider, and the optical positioning equipment does not have a problem of electromagnetic compatibility in a surgical navigation environment.

The invention relates to the technical field of fiber-optic communication, in particular to a high-speed butterfly-shaped encapsulating tube shell with a coupling lens, a light emitter assembly and a manufacture process of the assembly. The assembly mainly comprises a butterfly-shaped metal ceramic tube shell, a semiconductor refrigerator, a heat sink, a transition block, a collimating lens, an optical isolator, a thermistor, an emitter chip, a backlight detector, a focusing lens, a metal sleeve, a welding workpiece and a ceramic fiber-optic pin, wherein the tail of the butterfly-sahped metal ceramic tube shell is provided with an opening, and a gold-plating layer is arranged at the inner side of the opening; the semiconductor refrigerator is fixed inside the tube shell; the heat sink is fixed on the semiconductor refrigerator; the transition block, the collimating lens and the optical isolator are all fixed on the heat sink; the thermistor, the emitter chip and the backlight detector are fixed on the transition block; the focusing lens is integrally formed by pressing the metal sleeve and lens glass with a metal die; a gold-plating layer is also arranged at the outer side of the metal sleeve, the focusing lens is welded and fixed at the opening of the butterfly-shaped metal ceramic tube shell through AuSn solder; and the welding workpiece and the ceramic fiber-optic pin are welded and fixed on the tube shell. In the invention, the focusing lens is directly welded on the tube shell without assistance of a special optical calibration platform, the process is simple and the production cost is greatly decreased.

The invention provides a multidimensional full field optical calibration device used for the hyperboloidal reflection mirror which includes collimated light source, a beam microscopy, an optical reference arm, an optical measurement and a receive device; the collimated light beam issued by the collimated light source collimator the beam irradiates into the beam microscopy, the beam microscopy divides the collimated light source into two parts, the reflection part is after reflected by the reflection mirror II and then permeated the beam microscopy to be a reference light; the transmission part is converged to part of mirror of the measured hyperboloidal reflection mirror by the convergence lens, the extension of the convergence light in the intersection of a focus of the hyperboloidal reflection mirror, after reflected by the measured hyperbolic reflection mirror, converge to a standard spherical reflection mirror, the extension of the light converges to the core of the spherical reflection mirror, after reflected by the spherical reflection mirror, returns along the original track, then reflected by the measured hyperboloidal reflection mirror and the convergence lens mirror and semi- reflection mirror, to be a test light; reference light and convergence light converge to the receive device. The device for the invention can measure the surface morphology and measurement parameters of the hyperboloidal reflection mirror which have different scales and high reflection.

A sensor system comprises first and second PPG sensors. A monitoring system monitors detection by at least one of the first and second detectors an optical calibration signals, for performing time calibration between the first and second PPG sensors. This system makes use of two PPG sensors. To enable these sensors to be independent units, rather than being fully integrated into a combined system, a calibration system is provided. Based on detected optical signals, the behavior over time of each PPG sensor can be monitored and thus calibration can take place.

A camera-based auto-alignment process can include gripping a first calibration tool by a gripper unit of a robotic arm. Images of the first calibration tool can be captured by a camera coupled to the gripper unit. The gripper unit and camera unit can be aligned on two roughly parallel axes. The images can be analyzed to calibrate the axis of view of the camera with the gripper axis, providing an XY calibration of the robotic arm. The gripper unit can be calibrated on a Z-axis using optical calibration with landmarks provided on a second calibration tool, and / or by moving the gripper unit towards the work surface until it makes contact with the work surface and stops. Once calibrated, the camera can be used to identify one or more landmarks at known locations on the work surface to align the robotic arm with the work surface.

An optical system calibration system and method particularly suited for calibrating the optical slit planes in an ophthalmic diagnostic instrument. The system includes an illumination source projector, an illumination image receiver, and a calibration component all having known relative positions, orientations and physical and optical characteristics. The calibration component includes at least two separated, diffusely reflecting surfaces. Images of an exemplary slit illumination pattern projected onto the calibration component and formed on the diffusely reflecting surfaces are detected by the image receiver such as a video camera. Based upon camera image coordinates and triangulation parameters of the projector, the receiver, and the calibration component, the slit image positions on the image detector plane can be calibrated to the axially displaced, diffusely reflecting calibration component surface positions.

Approaches are disclosed for calibrating a plurality of imaging devices, such as microscopes. In certain implementations, a calibration plate is employed that includes a variety of calibration features. The calibration features comprise a geometric calibration, an illumination calibration, and an optical calibration. Imaging devices calibrated in accordance with the present approaches may be used to generate images having consistent attributes, such as brightness, regardless of which imaging device is employed.

An apparatus and related method for optical calibration of spectrophotometers is described. The apparatus is a calibration plate including one or more cuvettes filled with solutions of interest. The cuvettes are sealed to prevent evaporation. The cuvettes also possess a compressible component to allow for expansion of the solution and a bubble control apparatus to ensure that the compressible component does not intersect the beam path. A piece of neutral density glass is optionally included in the apparatus to track optical changes of the solutions over time.

The invention discloses an automatic calibration device for an optical power meter to be calibrated. The automatic calibration device comprises an automatic calibration unit and a central control unit. A multi-wavelength stable light source, a wavelength switching control module, an optical attenuator and a real-time online light splitting and sampling module are sequentially connected in the automatic calibration unit. The real-time online light splitting and sampling module comprises an optical splitter and a built-in optical power meter, one output of the optical splitter is connected with an output optical calibration interface which is connected with an external instrument to be calibrated, the other output of the optical splitter is connected with the built-in optical power meter, the built-in optical power meter is connected with the central control unit and capable of measuring the output optical power online in real time, and the central control unit is equipped with a communication module. According to the automatic calibration device, real-time calibration of the same light source is achieved in a real sense through the real-time online light splitting and sampling mode, external influencing factors are reduced, the optical power of the calibration interface is stable, the calibration precision is greatly improved, and the technologically revolutionary significance is provided.

The invention discloses a system and method for optical calibration of the dynamic navigation capability of an inertia measurement unit. The method of measuring displacement with a single laser displacement sensor and measuring angle with two laser displacement sensors is adopted to measure the displacement and angle of the inertia measurement unit from three dimensions in an external environment where a vibrating table is provided for dynamic navigation capability testing in real time, measured angle and displacement information is compared with an output value of the inertia measurement unit, and then calibration of the dynamic navigation capability of the inertia measurement unit is achieved. By the adoption of the method, non-contact measurement is achieved, output of the inertia measurement unit is measured in real time, bandwidth is large, stability is high, and application prospects are broad.

The invention relates to an optical calibration method for ribbon projection in a magnetorheological processing device, and belongs to the technical field of optical processing. In this method, a polishing wheel is placed just above a laser exit port of a scanner, and a high-speed laser profile scanner is used to scan the profile of a magneto-rheological fluid ribbon projection on the bottom of the polishing wheel in a certain range; then three-dimensional data obtained through the scanning is analyzed to obtain related information such as the spatial relation between the central position of the ribbon projection and a mirror surface, whether the ribbon projection is at the bottommost portion of the spherical surface of the polishing wheel, whether the convex profile of the magneto-rheological liquid ribbon is consistent in a certain range, the stability characteristics of a magnetorheological fluid reflected by changes of the ribbon projection profile with time at a same position and preliminary determination of a virtual axis angle of a magneto-rheological processing equipment The method of the invention can solve the problem of measuring the convex profile of the magnetorheological fluid ribbon projection in a magnetic field process in the magnetorheological processing technology.

The invention relates to a system and method for the optical calibration of the temperature of a micro-environment. The system comprises a thermochromic liquid crystal in combination with a luminophore. The steps of the method comprise providing in combination in the micro-environment at least one thermochromic liquid crystal and a luminophore, varying the temperature of the environment while irradiating the combination with light that includes light at one or more excitation wavelengths of the luminophore, and monitoring luminescence emitted by the combination while recording the temperature of the environment.

The embodiment of the invention relates to a multi-optical axis automatic calibration system. The multi-optical axis automatic calibration system includes: a near-infrared laser ranging system (1) mounted on a multi-dimensional adjustment system (11); an infrared system (2) connected with the near infrared laser ranging system through a rotary table (3); an imaging system (4) fixedly connected with the infrared system; a second optical calibration system (5) used for calibrating the coaxiality of the near infrared laser ranging system (1) and the infrared system (2), and comprising: a first laser reflector (51), a second laser reflector (52), a coupling reflector (53), an off-axis parabolic mirror (54) and a target (55), wherein the first laser reflector (51), the second laser reflector (52), the coupling reflector (53) and the off-axis parabolic mirror (54) are respectively coated with a total reflection film with a corresponding wavelength; and a computer system (6) for analyzing theimage of the target and automatically adjusting the angle of the multi-dimensional adjustment system to the analysis result.

A method for tuning a tunable optical transmitter to a target wavelength includes applying at least one tuning signal to the tunable optical transmitter to control the tunable optical transmitter to create an optical calibration signal according to nominal tuning information for the tunable optical transmitter. The optical calibration signal has a wavelength lying within a secure wavelength range, and the nominal tuning information is based on a nominal wavelength dependency for the tunable optical transmitter. The method also includes measuring a deviation between an actual wavelength dependency of the tunable optical transmitter and the nominal wavelength dependency, and determining calibration information based on that deviation. The calibration information is applied to determine a corrected nominal wavelength dependency from which target tuning information is determined. The tunable optical transmitter is controlled to create an optical channel signal according to the target tuning information.

The invention discloses a liquid nitrogen horizontal refrigeration device for testing an infrared detector Dewar assembly and a design method thereof. The device is fit for process performance test of a split type infrared detector Dewar assembly or an integrated type infrared detector Dewar assembly. The device is mainly formed by a liquid nitrogen cavity body wall (1), a liquid nitrogen cavity base (2), an upper cover (3), a vacuum keeping cover (4), a compression nut (5), a Dewar assembly installing flange (6), an extraction valve seat (7), an extraction valve plug (8), a housing (9), a cold finger (10), a transfusion pipe (11), an exhaust gas pipe (12) and a heat coupler (13). In this way, a stable adjusting value of liquid nitrogen flow can be obtained via a given computational formula and a liquid nitrogen flow adjusting rod (16) can be adjusted according to the adjusting value, thereby achieving an objective to control the liquid nitrogen flow. Thus, a problem is solved that liquid nitrogen is required for carrying out refrigeration during spectrum test, electric performance test and optical calibration of systems of a horizontally-arranged infrared detector Dewar assembly.

The invention discloses a calibration method and system for a circuit board automatic test system. The method comprises the following steps: S1, determining the first coordinate of an optical calibration point, wherein the first coordinate is the coordinate, of the optical calibration point, in a pattern coordinate system; S2, moving a test probe to the optical calibration point to acquire an optical image of a circuit board; S3, analyzing the optical image to determine the second coordinate of the optical calibration point, wherein the second coordinate is the coordinate, of the optical calibration point, in a test probe coordinate system; and S4, calculating a mapping relation between the pattern coordinate system and the test probe coordinate system based on the first coordinate and the second coordinate to complete the automatic calibration of the test system. The calibration method and system has automatic operation, high efficiency and high positioning precision.

The invention relates to an optical multi-point touch screen device and a method applicable to vibration and damp environment. The device comprises a screen, a touch screen frame and trapezoidal box-shaped components, wherein the touch screen frame is arranged on the outer edges of the screen, the trapezoidal box-shaped components are arranged at four corners of the screen frame, a linear array image sensor plate and a convex cylindrical lens are arranged in the components, and the sensor plate is connected with a driving plate through a connector. The optical multi-point touch screen device and the method have the advantages that the device is applicable to the modification of a plane large-screen display into a multi-point touch display, the problems of durability, light transmission rate and screen size limitation of a resistance screen and a capacitance screen are solved, the multi-point identification positioning method can be used for obtaining the center coordinates and the occupied regions of each touch point, in addition, ghost points can be effectively eliminated, the imaging characteristics of the convex cylindrical lens structure are adopted so that certain tolerance is realized on the vibration, in addition, the installation precision requirement on the structure is low, the imaging distortion is solved by adopting the optical calibration, the problems of high center precision and low peripheral precision of the screen of the triangular positioning method are avoided, a relative humidity sensor and electric heating glass are adopted, and the problem of optical touch screen failure caused by condensation in damp environment is avoided.

The invention discloses an optical axis consistency calibration method of an airborne multi-optical axis optical load, and belongs to the technical field of optical calibration. The calibration operation of the prior art is complicated, the difficulty is large, and the labor intensity is high. The optical axis consistency calibration method comprises the steps of: arranging a main laser auto-collimator and an auxiliary laser auto-collimator in front of a machine body; making the optical window of an aiming device of an airborne fire force control system opposite to the optical window of the main laser auto-collimator, and making the optical window of the photoelectric pod opposite to the optical window of the auxiliary laser auto-collimator; completing the coaxial calibration of the aimingaxis of the airborne fire force control system and the optical axis of the main laser auto-collimator; completing the coaxial calibration of the optical axis of the auxiliary laser auto-collimator and the optical axis of the main laser auto-collimator; completing the coaxial calibration of the optical axis of a central photoelectric sensor and the optical axis of the auxiliary laser auto-collimator; and finally, completing the coaxial calibration of the optical axis of each photoelectric sensor and the optical axis of the auxiliary auto-collimator one by one. According to optical axis consistency calibration method, the optical axis consistency calibration can be realized by only adjusting the calibration device and the to-be-calibrated optical load.

The invention discloses a cube prism optical calibration device for aiming and monitoring an optical axis of a telescope. The cube prism optical calibration device turns two laser beams into an angleof 180 degrees using a cubic prism method, which realizes the initial adjustment of the optical axis of a telescope optical system parallel to a reference standard plane mirror normal. The parallel relationship between two parallel plates is adopted to solve the high-precision precision adjustment of the optical axis of the telescope parallel to the reference plane mirror normal. According to thecube prism optical calibration device for aiming and monitoring an optical axis of a telescope, the problem of image quality change caused by the drift of the optical axis during the telescope adjustment process is solved, and real-time high-precision monitoring of the state of the tested system is realized. The optical path structure is simple, and the combination of coarse adjustment and fine adjustment greatly improves the efficiency of optical calibration. The optical calibration device of the invention is not only suitable for registration and real-time monitoring of the optical axis of the telescope optical system and the standard plane mirror normal, but also suitable for calibrating the angle between two opposite mirror surfaces, the angle between two optical plates, and other optical calibration fields.

This invention discloses an optical calibration rapid position tight screw device, which has the following structure: to open several crossed car imbed groove on its plane platform; to set screw holes in the crossing area of the groove; to plug the down guide rail on the mobile socket into the shape groove; to open a support screw cap bar hole on the mobile socket; the bar groove is relative to down guide rail; to fix coattail groove upper guide rail on the two sides of the top surface of the mobile socket; to fix an elastic locking mechanism on the upper guide rail.

The invention provides a device for acquiring a night vision true color image, which mainly comprises an objective lens, a three-primary-color filter, an image intensifier, a fiber coupler (or an optical repeater), a CMOS or CCD image sensor, an FPGA chip, a peripheral circuit and a controller. The invention also discloses a method of acquiring the true color image by using the above night vision true color image acquiring device. The filter is used for filtering light reflected by a target, the image intensifier is used for amplifying and multiplying single-color light after being filtered, the acquired three-primary-color image is fused to a color image, and color image acquisition in a night vision condition is realized. Compared with the prior art, the night vision true color image acquiring device has a simple structure, no optical calibration is needed in the case of use and operation, the final fused image is accurate in color matching, and the device is extremely suitable for being used in equipment such as a night vision device.

The invention relates to a small micro-fluidic chip system for biological particle parting analyzing and belongs to the field of biological sample detection.The small micro-fluidic chip system comprises an excitation fiber channel, an excitation slice carrying micro lens, a collection slice carrying micro lens and a collection fiber channel.The excitation slice carrying micro lens and the collection slice carrying micro lens are arranged on the two sides of a waste liquid microchannel respectively.The optical axis of the excitation slice carrying micro lens is perpendicular to the waste liquid microchannel.An included angle is formed between the optical axis of the collection slice carrying micro lens and the waste liquid channel.The excitation fiber channel and the collection fiber channel are formed in a chip.The micro-fluidic chip system is simple in structure, small in size, low in cost and power consumption, high in sensitivity, convenient to operate and free of optical calibration, and detection is accurate.A plurality of slice carrying micro lenses-fiber detection modules on the micro-fluidic chip can be machined to work in parallel, which helps to achieve high-flux detection.Therefore, the system is suitable for analyzing detection of a plurality of kinds of biological samples, especially for biological particles.

The invention discloses an optical calibration device for reflecting telescope optical axis monitoring based on polarization and beam splitting. The device comprises an optical fiber light source, a collimating lens, a beam splitting prism, a polarization and beam splitting prism, a first parallel flat plate, a quarter-wave plate, a pyramid prism, a second parallel flat plate, a converging lens and a detector. In the optical calibration process of a telescope system, the polarization and beam splitting prism, the quarter-wave plate and the pyramid prism are adopted to generate two beams whichare collinear in opposite directions, and high-precision registration of the optical axis of the optically calibrated telescope system and the normal of an auxiliary standard plane mirror is realized.The device is used for a relative test and overcomes test precision problems brought by manual interpretation errors, a test environment and the like in a traditional optical axis absolute test. Besides, the reference optical axis and the test optical axis share the same optical path, the influence of vibration in the testing process is avoided, and therefore test efficiency and optical calibration efficiency are greatly improved.

The invention discloses a knife edge device for measuring focal length in adjustment of a reflection long-focus telescope and a measuring method. In the adjustment process of a large-aperture telescope, the knife edge device with a readable high-precision five-dimensional adjusting frame is adopted, and a laser interferometer and a photoelectric autocollimator which are used in the adjustment process are attached, so that the focal length of a telescope system can be tested with high precision in the adjustment process of the large-aperture reflection long-focus telescope, the problem that thefocal length of a primary mirror and a secondary mirror cannot be accurately controlled in the adjustment process of the traditional large-aperture reflection long-focus telescope is solved, and theadjustment precision and the optical calibration efficiency are greatly improved.