Rapid processing method for increasing real-time phase-shift frame rate of laser interference fringes
A technology of laser interference and processing methods, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of time consumption, limited potential, real-time display of difficult-to-interfere fringe phases, etc.
Inactive Publication Date: 2015-12-09
SHANGHAI UNIV
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Problems solved by technology
However, due to the phase shift method in the implementation process, a large number of calculations are required
At the same time, the filtering method used to improve the quality of the phase-shifted image also takes time.
Traditional processing methods are difficult to achieve real-time display of the interference fringe phase, which limits the potential of this method for practical applications
Method used
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[0068] Preferred examples of the present invention are described in detail as follows in conjunction with accompanying drawings:
[0069] Such as figure 1 and figure 2 As shown, a fast processing method for improving the real-time phase shift frame rate of laser interference fringes uses shearing electronic speckle to measure the deformation of the peripheral fixed disk under concentrated load at its center. The detection process is as follows:
[0070] 1) A disk with a fixed perimeter (such as image 3 shown), placed in the optical path of shear speckle interference.
[0071] 2) Before the disc is stressed, a camera is used to collect four sheared speckle images sequentially with an interval of π / 2 phase shift, and the phase shift is realized by piezoelectric ceramics. The interferogram at the initial moment is as Figure 4 As shown, the above four speckle images are expressed as:
[0072]
[0073]
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[0076] in Represents the interference ...
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The invention relates to a rapid processing method for increasing the real-time phase-shift frame rate of laser interference fringes. In the method, a piezoelectric phase shifter generates four-step phase shifting; a camera synchronously acquires multiple speckle interference images; loaded interference images are subjected to special partition processing; and four-step phase shifting and mean filtering computation are performed by using a parallel computing method such that phase diagrams of the interference fringes are solved. The phase diagrams include the phase information of a tested object at a current time and can be demodulated through phases. The method improves four-step phase shifting and mean filtering computation efficiency by means of the parallel computing method so as to increase the phase image display speed by 3 to 4 times compared with a conventional phase-shifting method, thereby really achieving real-time phase shifting. In addition, the introduction of the mean filtering method effectively suppress image noise, obviously increases image contrast, extracts the real-time phase of the tested object.
Description
technical field [0001] The invention relates to a fast processing method for improving the real-time phase shift frame rate of laser interference fringes, belonging to the field of photoelectric detection. Background technique [0002] In the past two decades, various optical interferometry techniques, such as speckle interferometry and moiré interferometry, have become important methods for deformation field measurement. They are based on the principle of optical interference, have high sensitivity, and can measure the displacement and displacement derivative of the surface of the object under force. Because it has the characteristics of full-field measurement, simple optical path, convenient adjustment, and low environmental requirements, it is widely used in various precision measurements. [0003] Traditional optical interferometers usually give measurement results in the form of interference fringe patterns. Due to the influence of various noises, its signal-to-noise ...
Claims
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IPC IPC(8): G01B11/16
Inventor 张东升刘斌吴荣
Owner SHANGHAI UNIV