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Non-contact underwater full-field strain measurement method

A strain measurement, non-contact technology, used in measurement devices, instruments, optical devices, etc., can solve the problem of inability to measure underwater full-field strain, and achieve the effect of convenient testing

Inactive Publication Date: 2017-09-05
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a non-contact underwater full-field strain measurement method, which solves the problem that the underwater full-field strain cannot be measured

Method used

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  • Non-contact underwater full-field strain measurement method

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0019] combine figure 1 , a non-contact underwater full-field strain measurement method is characterized in that the method steps are as follows:

[0020] Step 1. Print the designed speckle pattern on the water transfer printing paper pattern, and pass the water transfer printing paper pattern to the surface of the object to be tested;

[0021] Step 2, taking speckle images of underwater objects before and after deformation through the underwater camera system;

[0022] Step 3. The computer processes the speckle image through digital speckle software to obtain a full-field deformation map of the underwater object.

[0023] combine figure 2 , the underwater camera system in step 2 includes a binocular camera 1, a camera housing 4, 2N photographic lights 3, two pieces of optical glass 2, two vertical arms 5 and two rolling bearings 6, wherein N≥3, The fron...

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Abstract

The invention discloses a non-contact underwater full-field strain measurement method. The method includes the steps that firstly, a speckle pattern is designed through MATLAB or Adobe Photoshop CS, and the speckle pattern is printed on a water transfer printing paper pattern; secondly, the speckle pattern is transferred to the surface of a to-be-measured object through the water transfer printing paper pattern; thirdly, speckle images generated before and after deformation of an underwater object are shot through an underwater camera shooting system; finally, a computer is used for processing the speckle images through digital speckle software, and a full-field deformation diagram of the underwater object is obtained. Full-field strain of the underwater object can be obtained without making contact with the underwater object; the designed underwater speckle pattern is transferred to the surface of the to-be-measured object, so that testing is more convenient and cheaper, and the method can be widely applied to underwater mechanical experiments and online strain monitoring in the fields of underwater aircrafts, underwater concrete and the like.

Description

technical field [0001] The invention belongs to underwater strain measurement technology, in particular to a non-contact underwater full-field strain measurement method. Background technique [0002] Chinese patent 201310097955.9 discloses a non-contact plane strain measurement method. The method is to use three optical mouse chips to form a sensor, paste the sensor on the surface of an object, and use the coordinate values ​​of the three optical mouse chips to calculate the strain value. However, this method can only test the single-point strain of the object, and cannot measure the full-field strain of the object; on the other hand, it is not realistic to stick the sensor on the surface of the underwater object, and the operation is difficult to do. [0003] At present, strain measurement is inseparable from strain sensors. Existing strain sensors are divided into two categories according to whether they are in contact or not: (1) Contact sensors: such as resistance strai...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 曹志威徐志洪朱康伟
Owner NANJING UNIV OF SCI & TECH
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