A multi-focus frequency-sweeping OCT focusing device and method thereof

Abstract

The present invention provides a multi-focus frequency-sweeping OCT focusing device and its method, which relate to the technical field of optical imaging and include an electric elevator and a focusing mechanism. The electric elevator includes a stage on which an aperture and a focusing mechanism are arranged. A fixing clip for fixing the sample to be inspected, a converging lens is arranged above the stage, and a half mirror is arranged above the converging lens; the focusing mechanism includes a frequency-sweeping light source and a first fiber coupler , the first optical fiber coupler optical path is connected with a reference optical path and a sample optical path, the reference optical path includes a first optical circulator, a first collimator lens and a plane mirror, and the sample optical path includes an optical circulator, a polarization controller . The advantage of the present invention is that the distance between the sample to be inspected and the focal point of the optical system is analyzed and the focus is automatically adjusted by introducing coherent light to generate interference, thereby effectively improving the focusing accuracy and speed.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a multi-focus frequency-sweeping OCT focusing device and a method thereof. Background technique [0002] The traditional focus is generally adjusted manually. Such a focusing process requires certain operating skills for focusing. If the operator is inexperienced, it is often impossible to determine the focus. The current auto-focus systems mainly include auto-focus systems with external auxiliary measuring equipment and auto-focus systems based on image quality evaluation. The former realizes autofocus through the distance between the optical system and the imaged target, but this method is complicated to install and debug and the system structure is complicated, so it is rarely used. The latter uses the auto-focus evaluation function to search for the focus position based on the quality of the collected images. This system is simple to implement and easy to use, and is...

AI Technical Summary

Problems solved by technology

Both of these methods are limited by motor accuracy, hysteresis error and response speed during motor movement, which will cause focusing errors

Because the optical system has a certain depth of field range, many optical focusing systems only adjust a part of the surface of the sample with low flatness to the focal plane, and do not make full use of the depth of field of the optical system, so that the sample can be enlarged within the depth of field. Clear field of view

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