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A space carrier modulation device

A carrier modulation and space technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of shortage, insufficient space carrier modulation technology, limited development and application, etc., to achieve simple operation, improve measurement accuracy and efficiency, and apply wide range of effects

Active Publication Date: 2022-05-27
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing CGS dynamic measurement research data show that the space carrier modulation technology for the CGS method is still underdeveloped, and there is a lack of easy-to-operate CGS space carrier modulation devices on the market, which greatly limits the development and application of this method

Method used

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Embodiment Construction

[0016] The space carrier modulation device proposed by the present invention has the following structure: figure 1 As shown, it includes: front grating 11, rear grating 31, front wedge prism 21 and rear wedge prism 41; the front grating 11, front wedge prism 21, rear wedge prism 41 and rear grating 31 are as follows figure 1 and figure 2 The front grating 11 is embedded in the front grating holding frame 12 on the front grating lifting rod 13, and the front wedge prism 21 is embedded in the front prism holding frame 22 on the front prism lifting rod 23. , the rear grating 31 is embedded in the rear grating holding frame 32 on the rear grating lifting rod 33, and the rear wedge prism 41 is embedded in the rear prism holding frame 42 on the rear prism lifting rod 43; the The front grating lifting rod 13 , the front prism lifting rod 23 , the rear prism lifting rod 43 and the rear grating lifting rod 33 are respectively mounted on the fixed base 14 .

[0017] In the above-ment...

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Abstract

The invention belongs to the technical field of full-field interference optical measurement, and relates to a space carrier modulation device. The device of the present invention utilizes the influence of the refractive index on the direction of propagation, installs two wedge-shaped transparent media between the two gratings, and adjusts the optical path difference space of the light passing through the two transparent media by changing the relative positions of the two transparent media distribution, and then realize space carrier modulation. The invention can effectively implement the linear optical path difference along the shearing direction in the measurement optical path, solve the technical problem that the carrier cannot be applied in the measurement process of the CGS method, and improve the measurement accuracy and efficiency. The device of the invention implements the application of space carrier by adjusting the inclination angle of the wedge-shaped prism. The device has a simple structure and a concise principle, does not need to change the optical path layout of the original measurement system, is easy to operate, has wide application range, and low economic cost.

Description

technical field [0001] The invention belongs to the technical field of full-field interference optical measurement, and relates to a space carrier modulation device. Background technique [0002] Coherent Gradient Sensing (CGS) method is a full-field interferometric gradient coherent measurement optical method proposed by Rosakis, an academician of the National Academy of Engineering (NAE), etc. It has the advantages of high measurement sensitivity and high measurement sensitivity, and has been widely used in in-situ monitoring, static and dynamic fracture research, residual deformation measurement and other fields. High-precision data processing methods have always been an important factor restricting the development of CGS methods. For static measurement requirements, the applicant's Chinese patent (ZL201910937847.5) proposes a phase shift data processing method, which improves the measurement accuracy. However, the data processing method of CGS is still immature for dyn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/161
Inventor 谢惠民李加强
Owner TSINGHUA UNIV
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