Integrated long-focus measuring device based on Talbot-moire technology

Abstract

The invention discloses an integrated long-focus measuring device based on Talbot-moire technology. The integrated long-focus measuring device based on the Talbot-moire technology comprises a laser device, an aspheric surface collimator lens, a one-side anti-reflection one-side increase-reflection lens, a plane mirror, a semi-reflection and semi-anti-reflection mirror, a Talbot interferometer, an imaging lens, a first charge coupled device (CCD), a counter point system and a long-focus lens to be measured. The Talbot interferometer comprises first optical grating, a second optical grating and a first scatter plate. The counter point system comprises a convergent lens, a second scatter plate and a second CCD. When the long-focus lens to be measured is not placed to the device, system optical axes are adjusted into consistency by utilizing the counter point system. Then a moire fringe L1 collected by the first CCD is input to a computer. The moire fringe L1 is placed into the long-focus lens to be measured. A moire fringe L2 including focal distance collected by the first CCD is input to the computer together with the moire fringe L1. An included angle formed by the moire fringe L1 and the moire fringe L2 is calculated through the computer to obtain a focal length f of the lens to be measured. The counter point system is designed in the device, the consistency of the axes of the system is ensured, and long-focus measurement with high precision can be achieved.

Description

Technical field [0001] The invention relates to the field of focal length measurement of optical elements and optical systems, in particular to an integrated long focal length measurement device based on Taber-Mohr technology. Background technique [0002] At present, there are two main methods for measuring the focal length of long focal length optical elements and optical systems: the traditional measurement method and the Taber-Moiré fringe method. Traditional measurement methods are convenient and highly accurate when measuring optical elements with small focal lengths, but for long focal length optical elements, these methods require complex optical systems and strict measurement environments. Measuring the focal length based on the Taber-Moiré fringe technique is a highly accurate measurement method. The light source system, Taber interferometer and image acquisition system in the measuring device of this method usually adopt a split structure, which is not convenient for o...

AI Technical Summary

Problems solved by technology

Traditional measurement methods are convenient and highly accurate when measuring optical components with small focal lengths, but for long focal length optical components, these methods require complex optical systems and strict measurement environments

Measuring length and focal length based on Talbot-Moiré fringe technology is a relatively high-precision measurement method. The light source system, Talbot interferometer and image acquisition system in the measurement device of this method usually adopt a split structure, which is not convenient for on-site measurement. ; Some measuring devices integrate the light source system and the Taber interferometer, but there is no point-to-point device, which makes the measurement process more complicated, cumbersome to operate, and not easy to carry

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