Large dynamic defocus range single-frame double-image light intensity acquisition device and acquisition method

A collection device and large dynamic technology, applied in measurement devices, photometry, measurement optics, etc., can solve the problems that high-speed dynamic real-time measurement cannot be applied, and the light intensity image collection device needs mechanical movement, etc., to reduce light energy. The effect of loss

Active Publication Date: 2019-07-12
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a single-frame double-frame image light intensity acquisition device with a large dynamic defocus range and its acquisition method, which overcomes the need for mechanical movement of the light intensity image acquisition device in the method for solving the phase of the light intensity propagation equation, which cannot be applied to Problems in high-speed dynamic real-time measurement occasions

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  • Large dynamic defocus range single-frame double-image light intensity acquisition device and acquisition method
  • Large dynamic defocus range single-frame double-image light intensity acquisition device and acquisition method

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[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] combine figure 1 , a large dynamic defocus range single-frame dual-image light intensity acquisition device, including a laser 1, a fiber coupler 2, an optical fiber 3, an optical fiber beam expander 4, a collimator lens 5, a first focusing lens 7, and a spatial light modulator 8. The second focusing lens 9, thin film beam splitter 10, reflector 11, rectangular prism 12 and CCD13, the fiber coupler 2 is fixed at the light outlet of the laser 1, one end of the fiber 3 is connected to the fiber coupler 2, and the other end is connected to the fiber The beam expander 4 is connected, and the laser 1, the fiber beam expander 4, the collimator lens 5, the first focusing lens 7, and the spatial light modulator 8 are arranged in sequence on the common optical axis, and the optical axis where the above-mentioned components are located is the first optical axis....

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Abstract

The invention discloses a wide-dynamic-defocusing-range single-frame double-image light intensity acquisition device and an acquisition method thereof. A spatial light modulator, which is placed on focal planes of two focusing lenses of a 4f system and is loaded with an angular spectrum transfer function, can realize digital defocusing of image-plane images. A beam splitting system with certain optical path difference, which is composed of a thin film beam splitter, a reflector and a right-angle prism, can achieve simultaneous acquisition of two images by one CCD. The whole system can acquire multiple defocusing intensity images in the relatively wide dynamic range without mechanical movement, and apply the images in the phase solving method based on a light intensity transmission equation. Therefore, the invention improves the speed and the precision of image acquisition in the light intensity transmission equation method, and is suitable for high-speed, dynamic and real-time measurement of light intensity and phase.

Description

technical field [0001] The invention belongs to the field of non-interference phase detection in optical measurement, and in particular relates to a single-frame double-image light intensity acquisition device with a large dynamic defocus range and an acquisition method thereof. Background technique [0002] As a non-interference wavefront detection method, the light intensity propagation equation method overcomes the shortcomings of the traditional interferometric method due to the complex optical path and the large impact of the measurement environment, and only needs to know two light intensity images of the object light propagating along the optical axis. The phase of the object can be calculated according to the numerical solution, and the calculation amount is small and the optical path is simple, so it has received widespread attention. However, the traditional image acquisition method - using a translation stage to collect light intensity images along the optical axi...

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Application Information

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IPC IPC(8): G01J9/00G01J1/42G01J1/04
CPCG01J1/04G01J1/0411G01J1/0437G01J1/42G01J9/00G01J2001/448
Inventor 马骏刘炳琦朱日宏高志山李建欣何庆浩王磊巴图潘少华魏聪石磊
Owner NANJING UNIV OF SCI & TECH
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