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3748results about "Testing optical properties" patented technology

LED optical parameter comprehensive testing device

The invention discloses an LED optical parameter comprehensive testing device, belonging to the technical field of optical parameter measurement. The LED optical parameter comprehensive testing device is technically characterized in that one end of a horizontal base provided with a one-dimensional mobile platform is fixedly provided with an arc-shaped clamp provided with a fiber-optic probe and astandard luminosity probe, the other end of the horizontal base is fixedly provided with an arc-shaped light collector consisting of an arc fiber-optic array and a linear array CCD (Charge Coupled Device), and a rotary clamping table for holding an LED to be tested is arranged on the one-dimensional mobile platform; light information acquired by the fiber-optic probe is converted into a spectrum band by a spectrograph and then is sent into a computer, outputs of the standard luminosity probe and the linear array CCD are sent to the computer through the data acquisition unit, the computer performs corresponding processing and operation on measurement data through measurement software to finally obtain the luminescence characteristics of the LED to be tested. According to the invention, theproblem on comprehensively measuring the LED on a single measurement instrument is solved; and the LED optical parameter comprehensive testing device has the characteristics of simplicity for operation, compact structure, fastness for measurement, easiness for realization and the like.

High-frequency error detecting apparatus and method for heavy caliber heavy relative aperture aspherical mirror

InactiveCN101013027AIncrease horizontal resolutionIncrease the vertical measurement rangeUsing optical meansTesting optical propertiesMultiple pointError surface
The invention discloses a high-frequency error detection device and method in the large caliber large relative aperture non-spherical mirror, the device including the five-axis movement adjustment platform with the interferometer focusing platform, the side swing reflecting mirror side swing platform located in front of the interferometer focusing platform, and the measured non-spherical mirror 3D movement adjustment platform located below the side swing reflection mirror side swing platform, and the multiple points supporting machine with the laser wave surface interferometer, the side swing reflection mirrors, and the measured non-spherical mirror installed on the corresponding platforms, and the main control computer with built-in detection data-processing algorithm program connecting with the laser wave surface interferometer. The device uses the main control computer to process the detection data-processing algorithm, which can combine the detected multiple part regions error surface maps into error surface map with medium or high frequency in full caliber, including the initial pose determining method, the overlapping regional data extraction algorithm and the regional data stitching algorithm. The invention is a high-frequency error detection device and method with low-cost, high-precision, high-efficiency in the large caliber large relative aperture non-spherical mirror.

Method and device for detecting polarization extinction ratio of optical polarizer

The invention provides a method and device for detecting a polarization extinction ratio of an optical polarizer. The detection method comprises the following steps of: making linear polarized light incident along a principal axis of an optical polarizer to be detected, and obtaining two light signals on two orthogonal optical axes at an outgoing end due to polarization crosstalk; interfering and carrying out photoelectric conversion and data acquisition on interfering light signals to obtain one group of discrete voltage signal values reflecting the interfering light intensity signals; and calculating coupling intensity h at each coupling spot based on a formula (1), and calculating an extinction ratio of the optical polarizer to be detected based on a formula (2). The device sequentially comprises a light source, an isolator module, a polarization module, the optical polarizer to be detected, a projection direction regulating module, an interferometer module, a data acquisition module and a central processor module. The invention has the advantage that the coupling intensity of the coupling spots is detected to induce the polarization extinction ratio, so that the measurement result is accurate. The invention is suitable for various optical polarizers, such as polarization maintaining fibers, polarization maintaining fiber couplers, polarizers and the like and has certain universality.

Apparatus and method for measuring dynamic target modulation transfer function

The invention relates to a dynamic object modulation transfer function measuring method and a device thereof, pertaining to the optical property measurement field. The invention aims at providing a dynamic object modulation transfer function measuring method and a device thereof which can carry out the dynamic object modulation transfer function measurement under different fields of view, namely, uniform linear motion, uniformly-accelerated rectilinear motion, simple harmonic motion, but also can measure static target modulation transfer function and separate the static target modulation transfer function from whole machine modulation transfer function. The device consists of a light source, a collimating lens, a pupil coupling system and an electro-optical imaging system which are arranged along the ray propagation direction in sequence; the electro-optical imaging system carries out imaging towards the light source moving along the guide rail direction and line spread function is obtained from the image and carried out one-dimensional Fourier transformation so as to obtain the dynamic object modulation transfer function. The method and the device of the invention are not only suitable for static image evaluation field but also for the image evaluation field of dynamic object imaging by a time-delay electro-optical imaging system.

Differential confocal combination ultra-long focal length measuring method and apparatus

ActiveCN101403650AReduce measurementReduced impact of focal length measurement accuracyTesting optical propertiesPupilFocal position
The invention belongs to the optical precise measurement technical field and relates to an ultra-long focal distance measuring method and a corresponding apparatus used for a differential confocal combined lens. The method firstly adopts the differential confocal focusing theory to respectively define the focus position of a reference lens and the focus position of the combination of measured lens and reference lens; then the distance delta between two focuses and the distance d<0> between two lenses are measured and then the formula is adopted to figure out the focal distance of the measured lens and the sensitivity for focal distance measurement can be simultaneously enhanced with the pupil filtering technique during the measuring process. The invention firstly puts forward the adoption of the features of the corresponding micro-lens focus while the differential confocal response curve passes the zero point so as to extend the differential confocal microscopy theory to the ultra-long focal distance measurement field and form the differential confocal focusing theory. The invention integrates the differential confocal focusing theory and the lens combination so as to get the advantages that the measurement precision is high and the anti-interference capability is strong. The invention can be applied to the detection for the lens with ultra-long focal distance and the high-precise focal distance measurement in the optical system assembling process.

Device and method for detecting dynamic properties of two-dimensional directional mirror

The invention relates to a device and method for detecting the dynamic properties of a two-dimensional directional mirror. The device comprises a dynamic photoelectric autocollimator, a controller of the dynamic photoelectric autocollimator, a hollow rotary platform, a controller of the hollow rotary platform, a rotary target, an adjustment platform, a data acquiring and processing system and a computer measurement and control system. Under the guidance of the computer measurement and control system, a target simulation reflector on the rotary target is driven by the rotary platform to simulate an optical target in movement, the dynamic photoelectric autocollimator provides the rapid and high-precision angle miss distance for the two-dimensional directional mirror, the data acquiring and processing system feeds back and controls the two-dimensional directional mirror to track the target simulation movement in real time, and the computer measurement and control system processes the measurement data of the photoelectric autocollimator in real time to obtain the data reflecting the dynamic response properties of the two-dimensional directional mirror. The device and method provided by the invention can be used for detection of properties of the two-dimensional directional mirror, such as axis shaking, step response, dynamic continuous tracking and the like.

Measurement mechanism of lens focal length, measurement method and thereof and optical quality evaluation method

InactiveCN101140196APrecision Measuring Focal LengthPrecise measurement of depth of focusTesting optical propertiesMeasurement deviceLong-focus lens
The invention relates to a device and a method for measuring lens focal length as well as a method for evaluating optical quality, wherein the device for measuring the lens focal length is composed of a plane mirror, a lens to be measured, a point light source, a vertical incision, a one-dimensional precise flat movable guide rail, a laser distance measuring instrument, a CCD detector and a display, and the method for measuring the lens focal length is as follows: (1) adjusting the autocollimation of the point light source and the lens to be measured; (2) adjusting the plane mirror to make the transflective convergent beam enter the CCD detector; (3) measuring the focal depth of the lens to be measured; (4) measuring the distance L from the point light source to the geometric main plane of the lens to be measured; (5) calculating the focal length f = L + d of the lens to be measured, and the d is the distance between the geometric main plane of the lens and the optical main plane. The optical processing quality of the lens to be measured is qualitatively evaluated through the observation of shape of the far-field focal spot. The device and the method are applied to the measurement and evaluation of the small-bore short-focus and large-bore long-focus lens, and have the advantages of the intuitionism, the high measuring precision and the simple mechanism.

Gantry type four dimensional automatic measurement used for detecting display screen color performance

The present invention discloses a composition method of a gantry four-dimensional automatic measurement platform for detecting photochromic performance of display screens and a gantry four-dimensional automatic measurement platform using the method. The present invention relates to the automatic measuring technology of the photochromic performance of display screens, and comprises a platform base, a gantry frame, an X-axis moving mechanism, a Y-axis moving mechanism, a Z-axis lifting mechanism, and a display screen-carrying rotating platform. By moving the mechanisms to control the circuit, the four-dimensional automatic measurement platform for detecting photochromic performance of display screens is flexibly controlled to accomplish the three-dimensional move of the photochromic measuring instrument and the accurate one-dimensional rotation of the display screen to be measured, the present invention is characterized in stable movement of the photochromic measuring instrument, small rotation radium of the display screen, novel structure, small driving power needed, small size, light weight, low cost, rapid measuring speed, high reliability and so on. The present invention can be widely applied to the photochromic automatic detecting system of LCD or LED television screen, display screen, or mobile phone screen and so on, and the present invention can precisely adjust the coordinate position of the test points and the angle of the display screen intelligently according to the detecting requirement of photochromic performance of the display screens under the computer management, and rapidly accomplish the detection of photochromic performance.

Method for determining the image quality of an optical imaging system

The invention is directed to a method for determining the image quality of an optical imaging system and to the use of the method according to the invention for determining the influence of samples on the amplitude distribution and phase front distribution of the illumination light, of which the amplitude distribution is known in particular. The invention comprises the following steps: adjusting the subassemblies relative to one another in such a way that it is possible to project images of a sample on the detection device; recording a plurality of images of the sample from different reference planes near the focus plane; improving the image quality by image processing, particularly to reduce noise, to compensate for local variations in sensitivity of the detection device, and to center the intensity centroids respectively on a predetermined location in the images; computational linking of the spatially resolved image information, of adjustment values and system variables relating to the optical imaging system, and of information concerning the sample with the aim of determining characteristic numbers that are characteristic of the wavefront deformation caused by the imaging system; and outputting the characteristic numbers and associating them with the imaging system for describing the image quality.

Method and device for calibrating phase modulation of spatial light modulators by utilizing heterodyne interference

The invention discloses a method for calibrating phase modulation degree of spatial light modulators, and the method is used for detecting the phase modulation information by utilizing a heterodyne interference technology. In the method, two beams of coherent optical waves are led to generate a frequency difference by an acousto-optic frequency phase shifter, and the two beams of coherent optical waves are respectively used as a measuring beam and a reference beam; then the effective display area of the spatial light modulator is divided into two parts, a gray value written into one part is 0, and the part is taken as a reference area; the change range of the gray value of the other part is 0-255, and the other part is taken as a test area; the measuring beam is modulated by the spatial light modulators of the reference area and the test area and then interfered with the reference beam; then two photoelectric detectors at an interference field are utilized to respectively detect a reference signal and a measured signal; and the phase difference between the two photoelectric detectors is the phase modulation degree to be measured, therefore, the corresponding relation between the gray value and the phase modulation degree can be established, so that the phase modulation degree of the spatial light modulators can be calibrated.

Device and method for measuring transmissivity and reflectivity of optical element with heavy calibre

The invention provides a device and method for measuring the transmissivity and the reflectivity of an optical element with a heavy caliber. The device comprises an optical system, a photoelectric conversion and mechanical control system and a signal processing system. The optical system consists of a solid laser, a polarizer, a visible light source for regulating an optical path and preimaging, a beam expanding system, a dispersion prism and an attenuation lens; the photoelectric conversion and mechanical control system consists of a photoelectric detector, a scientific grade network CCD (Chare Coupled Device) and an element supporting platform; and the signal processing system consists of a data acquisition card, a network cable and a computer. The scientific grade network CCD monitors the position of a light spot on the photoelectric detector, feeds back and regulates the detector to the optimal position, also monitors a macroscopic scattergram of reflected or transmitted light beams and reflects the uniformity of reflectivity and transmissivity. The device and the method, provided by the invention, have the characteristics of simple structure, convenience for regulation as well as high efficiency and precision, and the precision for repeated measure is up to 0.05 percent.

Optical device measuring method and device based on double sideband modulation

ActiveCN104101484AExpand sweep rangeImprove sweeping efficiencyTesting optical propertiesPhotovoltaic detectorsSingle-sideband modulation
The invention discloses an optical device measuring method and device based on double sideband modulation, which belongs to the technical fields of optical device measuring and microwave photonics. An optical double sideband modulation method is used to modulate a radio frequency signal to a first optical carrier signal, so as to generate a double sideband modulation signal. The double sideband modulation signal passes through an optical device to be measured to carry out beam combining with a second optical carrier signal. Frequency difference is between the second optical carrier signal and the first optical carrier signal. A photoelectric detector is used to carry out beat frequency on the signals after beam combining. The amplitude information of a +1 order sideband signal and a -1 order sideband signal in the beat frequency signals is extracted. The frequency of the radio frequency signal is scanned, so as to acquire the broadband amplitude frequency response of the optical device to be measured. The invention further discloses an optical device measuring device based on double sideband modulation. According to the invention, the system complexity and the cost are reduced; the measuring range and the measuring efficiency are greatly improved; and more importantly, a new direction is opened up for an optical device measuring technology.

Device for detecting wave front of large-aperture optical system

The invention relates to a device for detecting the wave front of a large-aperture optical system. The device comprises an interferometer, a five-dimensional adjustment platform, a numerical-control turntable, a numerical-control electric displacement platform, a self-collimation standard plane mirror, a two-dimensional adjustment rack and a computer control and data processing system. The device is characterized in that: the wave front of the large-aperture optical system is divided into a plurality of sub-aperture wave fronts, the interferometer and the self-collimation standard plane mirror detect the sub-aperture wave fronts of the large-aperture optical system, the numerical-control turntable and the numerical-control electric displacement platform control the standard plane mirror to move so as to scan the sub-aperture wave fronts, the interferometer detects and records the sub-aperture wave fronts, so that the detected sub-aperture wave fronts cover the whole large-aperture optical system; and the computer control and data processing system stitches the sub-aperture wave fronts through algorithms, so that the full-aperture wave front of the large-aperture optical system is obtained, and the detection on the wave front of the large-aperture optical system is finished. The device has the advantages of simple structure, low cost and capability of detecting the image quality of the wave front of a large-aperture optical system with the aperture of not less than 1000 mm.

Photoelectric detector amplitude versus frequency character test method for optical fiber peg-top

InactiveCN101126784AAccurate Frequency CharacteristicsAccurately obtain frequency characteristicsSagnac effect gyrometersContactless testingGyroscopePhotodetector
The utility model discloses a method for testing the frequency properties of the photoelectric detector used for fiber optic gyroscopes. A signal generator produces sinusoidal signals and adds the signal to a light intensity modulator to carry out sinusoidal modulation on the optical power of the optical signal from the fiber source in order to produce an optical signal with sinusoidal components. The measured photodetector converts the modulated optical signal into an electrical signal and samples the electric signal by means of high-speed data acquisition card, then conducts narrowband filter and signal processing over the collected samples and calculates the corresponding frequency response. The frequency sequence pre-selected by a numerical control system changes the frequency at which the sine wave generator (NC) system sends out signals , tests a series of frequency point responses, which can be combined into an amplitude frequency response curve of the measured photodetector, and the curve is transmitted to the terminal computer for displaying and storage. By controlling all the test processes by numerical control system, the utility model has the advantages of automatic measurement, fast testing speed, high testing precision, and therefore is suitable for carefully weighing the photodetector frequency performance in the whole operating frequency range.
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