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Application device based on light intensity transmission equation phase retrieval

A technology of light intensity transmission equation and phase recovery, which is applied in the direction of measuring device, measuring optics, optical radiation measurement, etc., can solve the problems of man-made error mechanical system, long measurement time, and dynamic object measurement that cannot move relatively fast, so as to avoid The effect of human error

Inactive Publication Date: 2016-06-15
SHANGHAI UNIV
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Problems solved by technology

The traditional light intensity transmission equation phase recovery application device needs to manually or mechanically move the CCD or the object, which will inevitably introduce human error or mechanical system error; secondly, the traditional experimental device camera only takes one intensity image at a time, and measures The time is long, so it is impossible to measure relatively fast-moving dynamic objects

Method used

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  • Application device based on light intensity transmission equation phase retrieval

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Embodiment Construction

[0015] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0016] A phase recovery application device based on the light intensity transmission equation, comprising a light source, a 4f system, a spectroscopic sheet, a reflector and a CCD; the measured object 9 is arranged between the light source and the 4f system, and the first spectroscopic sheet 12 is arranged behind the 4f system, The first spatial light modulator 15 is arranged above the first beam splitter 12, the second beam splitter 16 is arranged orthogonally below, and the first reflector 13 and the second reflector 14 are arranged at the rear to be orthogonal to each other; the front of the second beam splitter 16 CCD21 is set, the second spatial light modulator 17 is set behind, the third reflector 19 and the fourth reflector 20 are orthogonal to each other, and the third spatial light modulator 18 is set below; the light source is colli...

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Abstract

The invention relates to an application device based on light intensity transmission equation phase retrieval. According to the device, a light splitting sheet, a reflector and a spatial light modulator are used for dividing an imaging light beam into three sub-light beams; and an angular spectrum transfer function of the spatial light modulator is adjusted to make CCD obtain a focusing intensity image and a positive defocusing intensity image and a negative defocusing intensity image at the same time, wherein the positive defocusing intensity image and the negative defocusing intensity image have identical defocusing distance; then the light intensity transmission equation phase retrieval technology is applied on the collected images to rebuild the phase of an object. No mechanical movement or adjustment is required during the collecting process and only single exposure of single camera is needed so that quantitative phase position images can be retrieved stably and fast by use of the system; the application of traditional light intensity transmission phase imaging can be expanded to measure objects moving at high relative speed.

Description

technical field [0001] The invention relates to a phase recovery application device based on light intensity transmission equation. Background technique [0002] The phase recovery technology based on the light intensity transmission equation is a non-interference quantitative phase recovery method, which performs phase reconstruction by measuring the intensity information of the focus plane and the defocus plane. Compared with the traditional interferometric technology, the light intensity transfer equation phase recovery technology only needs to measure the light field distribution of a single optical path, without the superposition of object light and reference light, so there is no need for complex optical systems and no strict requirements for the experimental environment ;Secondly, the light intensity transmission equation phase recovery technology can directly solve the phase from the measured intensity image without unwrapping the obtained phase, and the unwrapping a...

Claims

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Application Information

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IPC IPC(8): G01J9/04
CPCG01J9/04
Inventor 刘贝贝于瀛洁周文静伍小燕
Owner SHANGHAI UNIV
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