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High-precision optical extensometer based on color camera, and measurement method

A technology of optical extensometer and color camera, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of limited application and high cost, eliminate false displacement and false strain, improve measurement accuracy, and improve strain measurement accuracy Effect

Inactive Publication Date: 2020-02-18
HOHAI UNIV
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Problems solved by technology

[0005] In response to this problem, Bai Pengxiang et al. proposed a strain correction method in 2015, which requires additional correction sheets to ensure higher accuracy. Some scholars have proposed to use telecentric lenses or multiple cameras to avoid the pinhole imaging model, which is expensive. Limit its application in practical engineering

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  • High-precision optical extensometer based on color camera, and measurement method
  • High-precision optical extensometer based on color camera, and measurement method

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0032] Such as figure 1 As shown, a high-precision optical extensometer based on a color camera disclosed in the embodiment of the present invention includes a color digital camera 11, a long focal length lens 10, a dichroic prism 7, a blue color filter 8, a red A color filter 9, a first reflector 4, a second reflector 5, a third reflector 6 and a data processing device.

[0033] The blue color filter 8 and the red color filter 9 are respectively covered on two adjacent surfaces of the dichroic prism 7. Specifically, the dichroic prism 7 includes four surfaces (two are parallel to the optical axis of the long focal length lens 10). surface, two surfaces perpendicular to the optical axis of the telephoto lens 10), the red color filter 9 is located on the farther surface of the telephoto lens 10 among the two surfaces perpendicular to the optical ax...

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Abstract

The invention discloses a high-precision optical extensometer based on a color camera, and a measurement method. The involved equipment comprises a color digital camera, a beam splitter prism, a bluecolor filter, a red color filter, three reflectors and a data processing device. In the measurement method, a color digital camera and a corresponding optical element are used for tracking a target point, and the false displacement and false strain caused by the out-of-plane displacement on the surface of a sample and a single-camera pinhole imaging model can be eliminated, thereby greatly improving the in-plane displacement and strain measurement accuracy of the sample.

Description

technical field [0001] The invention relates to a high-precision optical extensometer based on a color camera and a measurement method, belonging to the fields of optical measurement and nondestructive testing. Background technique [0002] Strain measurement has always been one of the important goals in the fields of material performance testing, structural failure analysis, and industrial deformation monitoring. Traditional strain measurement technologies mainly include contact and non-contact measurement technologies. [0003] Contact measurement technologies such as resistance strain gauges, optical fiber strain gauges or mechanical extensometers not only add additional mass to the sample to be tested, but also may strengthen the sample to a certain extent due to the use of binders, making These measurement methods are difficult to accept in the detection of rapidly developing samples such as biological materials and thin film materials. [0004] In non-contact measurem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01B11/02
CPCG01B11/02G01B11/16
Inventor 白鹏翔朱飞鹏雷冬
Owner HOHAI UNIV
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