External modulation optical fiber interference fringe projection real-time three-dimensional shape measuring system

An optical fiber interference, real-time three-dimensional technology, applied in measurement devices, optical devices, instruments, etc., can solve the problems of associated amplitude modulation and affect measurement accuracy, and achieve the effects of improving measurement accuracy, strong anti-interference ability, and simple structure

Active Publication Date: 2014-01-15
TIANJIN UNIV
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Problems solved by technology

However, this method adjusts the laser, which is prone to associated amplitude modulation and affects the measurement accuracy.

Method used

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  • External modulation optical fiber interference fringe projection real-time three-dimensional shape measuring system
  • External modulation optical fiber interference fringe projection real-time three-dimensional shape measuring system
  • External modulation optical fiber interference fringe projection real-time three-dimensional shape measuring system

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] In order to improve measurement accuracy and realize real-time three-dimensional shape measurement, an embodiment of the present invention provides a real-time three-dimensional shape measurement system for externally modulated optical fiber interference fringe projection, see figure 1 , see the description below:

[0027] The first part is the externally modulated optical fiber interference fringe projection system, such as figure 1 shown. The laser light emitted by the laser 1 passes through the optical isolator 2 and then is coupled into the 3dB coupler 3 by the a arm, and then is divided into two paths by the 3dB coupler 3, and then enters the signal arm c and the reference arm d respectively. After the light is split, it ...

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Abstract

The invention discloses an external modulation optical fiber interference fringe projection real-time three-dimensional shape measuring system. The system is based on optical fiber interference fringe projection, large modulation degree sine phase modulation and synchronization integration high-accuracy phase contour measuring, and meanwhile optical fiber end face Fresnel reflection interference signals are used for processing and solving interference signals which are fed back to a piezoelectric ceramic control circuit, and measuring accuracy is improved. Structure is simple, and achieving is easy. The whole system is of a closed-loop structure, anti-jamming capability is strong, real-time measuring and motoring capacity is achieved, the system improves control effect on piezoelectric ceramics through a high-voltage processing circuit, and various requirements in practical application are met.

Description

technical field [0001] The invention relates to the field of phase profile measurement, in particular to a real-time three-dimensional shape measurement system for externally modulated optical fiber interference fringe projection. Background technique [0002] Three-dimensional surface or three-dimensional shape measurement technology is currently an advanced technology in precision measurement, and is an important means of scientific research in scientific analysis, industrial control, bioengineering, biomedicine and material science; especially for aircraft fuselage, steam turbine blades, The online surface detection link in the processing and manufacturing of equipment such as lithography projection objective lens puts forward higher requirements for 3D shape measurement technology and promotes its development in the direction of high-precision and intelligent dynamic measurement. The traditional fringe projection device uses grating projection combined with a mechanical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
Inventor 段发阶吕昌荣伯恩冯帆段晓杰张甫恺邓震宇
Owner TIANJIN UNIV
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