Method and device for improving precision of optical detection instrument

Abstract

The invention discloses a method and device for improving the precision of an optical detection instrument. Hardware equipment comprises a display screen, a plurality of camera lenses, a reflecting cover and a mechanical structure. According to the scheme, a display screen light source is used, and compared with a laser interferometer, the cost is greatly reduced. The upper camera lens is used forcollecting reflected light of the center area of a detected object, and the cameras on the two sides are used for collecting reflected light converged by the reflecting cover. The design of the reflecting cover makes the effective analysis area of the detected sample expanded, and the number of points collected by the cameras is increased, so that the detection precision of the curvature radius Ris improved.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method and a device for improving the precision of an optical detection instrument. Background technique [0002] A lens is a piece of glass or other transparent material with one or more curved surfaces used to make things appear clear, larger, or smaller when viewed through it. Optical lenses are widely used in precision optical systems such as glasses, cameras, and telescopes, among which the radius of curvature is one of the most important parameters in the measurement of spherical optical elements. Its precision will directly affect the overall performance of the optical system. At present, the commonly used methods for measuring the radius of curvature include spherometer, surface profiler method, coordinate measurement method, autocollimator method and interferometry. However, each method has its own characteristics, and the measurement error is also different. Due to ...

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Problems solved by technology

However, when reaching the detection edge, due to the large height fluctuation, the density of interference fringes increases sharply in a small range, which greatly affects the analysis accuracy. In order to avoid detection errors, the interferometer properly filters high-frequency errors, so it cannot detect the sharp drop of the edge. Height of section or step difference

When the value of the radius of curvature R is small, such as image 3 As shown, there is a step difference on the edge of the measured object, and it is impossible to accurately detect how many wavelength values

[0018] like Figure 4 As shown, the surface shape meter can achieve better detection for large R value or flat surface, but for components with small R value, due to the observation from the angle of the image collector, the reflection angle is large, and the area occupied by the screen on the spherical surface Small, resulting in small number of measurement points, resulting in small measurement area and low accuracy

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