Space carrier modulation device

A carrier modulation and space technology, applied in measurement devices, optical devices, instruments, etc., can solve the problems of insufficiency, lack, limited development and application of space carrier modulation technology, etc., to improve measurement accuracy and efficiency, easy to operate, suitable for wide range of effects

Active Publication Date: 2021-08-24
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

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 a structure such as figure 1 As shown, including: front grating 11, rear grating 31, front wedge prism 21 and rear wedge prism 41; described front grating 11, front wedge prism 21, rear wedge prism 41 and rear grating 31 are as figure 1 and figure 2 It is installed on the same optical axis as shown; the front grating 11 is embedded in the front grating holding frame 12 on the front grating lifting rod 13, and the front wedge-shaped prism 21 is embedded in the front prism holding frame 22 on the front prism lifting rod 23 Among them, the rear grating 31 is embedded in the rear grating holder 32 on the rear grating lifting rod 33, and the rear wedge prism 41 is embedded in the rear prism holder 42 on the rear prism lifting rod 43; 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 installed on the fixed base 14 ...

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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. According to the device, the influence of the refractive index on the propagation direction is utilized, the two wedge-shaped transparent media are installed between the two optical gratings, the optical path difference spatial distribution of light passing through the two transparent media is regulated and controlled by changing the relative positions of the two transparent media, and then spatial carrier modulation is achieved. According to the invention, the linear optical path difference along the shearing direction can be effectively applied in the measurement optical path, the technical problem that the carrier wave cannot be applied in the measurement process in the CGS method is solved, and the measurement precision and efficiency are improved. According to the device, the space carrier is applied by adjusting the inclination angle of the wedge-shaped prism, the structure is simple, the principle is simple, the optical path arrangement of an original measurement system does not need to be changed, operation is easy, the application range is wide, and the economic cost is low.

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 (hereinafter referred to as CGS) method is a full-field interference-like gradient coherent measurement optical method proposed by Rosakis, an academician of the National Academy of Engineering (NAE) in the United States. This method has full-field, real-time, high-precision High, high measurement sensitivity and other advantages, 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. Howe...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/161
Inventor 谢惠民李加强
Owner TSINGHUA UNIV
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