5 results about "Minimum deviation" patented technology

The invention discloses an automatic optical prism optical axis parallelism adjusting method based on image processing, and relates to the technical field of high-end equipment optical detection. According to the scheme, a prism reflection image sequence is collected based on a calibration light source, an optical axis projection coordinate system is established, light spot geometric centroid and boundary parameters are extracted, and an optical axis direction vector matrix is constructed; calculating an optical axis included angle deviation according to the multi-frame image, and establishing an optical axis parallelism parameter model; decomposing the error distribution matrix through an iterative minimum deviation method to obtain attitude bias and system aberration components, and generating a prism attitude adjustment vector to realize closed-loop automatic adjustment; according to the invention, high-precision and self-adaptive adjustment of the optical axis parallelism can be realized under the conditions of complex illumination and device batch fluctuation, and the stability, consistency and automation level of optical system installation and adjustment are improved.

The application relates to a minimum deviation angle determination method and device, computer equipment and a readable storage medium. The method comprises the following steps: obtaining a minimum deviation angle corresponding to a current rotation round and a target rotation angle of a to-be-tested sample, rotating a sample table where the to-be-tested sample is located to a position of the target rotation angle, rotating an angle detector associated with the to-be-tested sample to a position of the minimum deviation angle, and obtaining an angle deviation value between incident light, refracted light of the to-be-tested sample and the rotated angle detector; in a case where the angle deviation value is not 0, updating the minimum deviation angle and the target rotation angle according to a top angle of the to-be-tested sample, a reference angle, the target rotation angle, the minimum deviation angle and the angle deviation value, and returning to rotate the angle rotator and the sample table again until the angle deviation value is 0, and finally obtaining a final minimum deviation angle. The method improves the accuracy of the determined minimum deviation angle.

The invention relates to a machine difference control method and a standard optical system. The method comprises the following steps: carrying out flat field correction on a camera under different working distances; shooting an object to be detected under different flat field correction conditions, selecting a plurality of feature points and measuring to obtain corresponding first feature values; measuring feature points of the same picture and the same position of the to-be-detected object, determining measurement data, and selecting a working distance with the minimum deviation as an optimal calibration distance; selecting a first camera which is qualified in calibration as a reference template, shooting the high-uniformity optical integrating sphere and extracting second characteristic values of uniformly distributed point locations; and comparing the third feature value extracted by each camera with the second feature value, and determining that the corresponding camera is calibrated to be qualified under the condition that the maximum difference value in the third feature value and the second feature value conforms to a preset specification, otherwise, performing calibration again. The method can improve the calibration precision, and effectively controls the machine difference.

The application relates to a preparation method of a four-fold frequency crystal guanidinium tetrafluoroborate device, which comprises the following steps: firstly, measuring a frequency doubling coefficient of the crystal by a Maker fringe method to obtain two non-zero effective frequency doubling coefficients; secondly, measuring main refractive indexes of the crystal at 11 wavelengths between 253 nm and 2325 nm by a minimum deviation angle method, and fitting a Sellmeier equation; thirdly, calculating a phase matching curve of the crystal I or II type by a computer program according to the Sellmeier equation, and combining the frequency doubling coefficient to determine a phase matching point of the crystal; fourthly, cutting the crystal according to the phase matching direction, polishing two light transmission surfaces, and coating a dielectric film to obtain the four-fold frequency crystal device; and the four-fold frequency crystal device is used for generating four-fold frequency laser output, the frequency doubling effect is 4.7 times that of KDP, and the four-fold frequency crystal device has good practical application value in the field of laser technology.

The invention provides a wind lidar-oriented light beam turning optimization method, which comprises the following steps of: assuming that the size of a directional angle of a radar, the refractive index of a material used by a wedge-shaped mirror and the vertex angle of the wedge-shaped mirror are required, on the premise that an incident light angle meets a minimum deviation angle, selecting a proper material, and designing a light beam turning optimization model with the vertex angle of the wedge-shaped mirror, the diameter top of the cylindrical optical piece is a flat top. And finally, the wedge-shaped lens is loaded in the metal sleeve to form a wedge-shaped lens assembly, the wedge-shaped lens assembly is connected with a telescope tube of the wind measurement laser radar through the adapter, and light beam turning of the wind measurement laser radar is realized through the wedge-shaped lens. According to the invention, the wedge-shaped lens is used for refraction to form a directional angle, and astigmatism introduced by the wedge-shaped lens is avoided, so that the focal length and the signal-to-noise ratio of the transmitting-receiving lens cone are not affected after the wedge-shaped lens is added.