Center deviation measuring device and method based on liquid lens

Abstract

The invention discloses a center deviation measuring device based on a liquid lens. The device comprises a mechanical adjustment module, an optical measurement module combined with the mechanical adjustment module, and a main control computer. The main control computer is electrically connected with the mechanical adjustment module and the optical measurement module; a to-be-measured optical lensis placed on the mechanical adjustment module, the optical measurement module comprises two liquid lenses, the focal length is changed by changing the shapes of the liquid lenses, and the mechanical adjustment module moves in the vertical direction, so that the measurement range of a to-be-measured optical lens in a confocal mode is not limited, and the measurement precision is improved. The invention further discloses a center deviation measuring method based on the liquid lens, the focal length of the liquid lenses is changed, the mechanical adjusting module is matched for adjustment, the center deviation is calculated through the main control computer, operation is easy and convenient, and the measuring result is accurate.

Description

technical field [0001] The invention relates to the technical field of optical measurement, more precisely, to a liquid lens-based center deviation measurement device and method. Background technique [0002] With the development of science and technology, the precision requirements for optical systems in various fields are becoming more and more stringent, such as the requirements for resolution, field of view, aperture and other technical indicators. Correspondingly, the structure of the optical lens is becoming more and more complex, the number of lenses in the optical lens is also increasing, and the tolerance requirements are becoming more and more strict. The lens is the most basic optical element in the optical system, and its centering accuracy directly determines the imaging quality of the optical lens. Therefore, in the lens assembly process, the center deviation of the optical lens must be strictly controlled. [0003] In the prior art, there are two options for ...

AI Technical Summary

Problems solved by technology

However, this solution has the following disadvantages: (1) in the focusing method, due to the mechanical focusing, there are moving components, and the focusing will cause mechanical vibration, thereby affecting the measurement accuracy; (2) according to the F number of the mirror to be measured The number of switched lenses is large, the operation is complicated, the measurement efficiency is low, and the equipment cost is high

The measurement range of the "conventional mode" is not limited, but the measurement range of the "confocal mode" is limited under the condition of a fixed focal length and focusing stroke, and except for the convex surface R<ΔT, the measurement resolution of the "confocal mode" higher than "regular mode"

However, this solution uses a fixed focal length lens, so the measurement range of the "confocal mode" is limited, and higher measurement accuracy cannot be obtained.

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