Pressure vessel air tightness detection method based on connected domain determination

An air tightness detection, pressure vessel technology, applied in the direction of detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, instruments, etc., can solve the problem that the detection algorithm cannot be applied to the actual scene, etc.

Active Publication Date: 2019-01-01
ZHEJIANG UNIV OF TECH
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Therefore, the detection algorithm of shooting bub...

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  • Pressure vessel air tightness detection method based on connected domain determination
  • Pressure vessel air tightness detection method based on connected domain determination
  • Pressure vessel air tightness detection method based on connected domain determination

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Embodiment Construction

[0028] The specific implementation of the computer vision-based pressure vessel airtightness detection method of the present invention will be described in detail below in conjunction with the embodiments.

[0029] A method for detecting the airtightness of a pressure vessel based on computer vision, specifically comprising the steps of:

[0030] Step 1: Set the original pressure value of the pressure vessel as P 0 , the pressure value after T time is P 1 , when P 0 -P 1 ≤Δ, Δ is the pressure difference threshold, it means no pressurization; when P 0 -P 1 When >Δ, it means that the pressure is being applied, and the air tightness test starts;

[0031] Step 2: Get the n frame images of the video after the airtightness test starts, n=t*f, where t is the test duration, and f is the video frame rate: record n ​​frame images as I 1 , I 2 ,...,I n , to I i , i=1,2,...,n is grayscaled, and the corresponding grayscale image G is obtained i ; In this embodiment, the resolutio...

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Abstract

The invention discloses a pressure vessel air tightness detection method based on connected domain determination. The method comprises the following steps of step1, setting the original pressure valueof a pressure vessel to be P0, setting the pressure value after T time to be P1, and when P0-P1</=delta, setting the delta as a pressure difference threshold, which expresses a unpressurized state; when P0-P1>delta, expressing that the pressure is being applied and an air tightness test begins; step2, taking the N frames of the images of a video after the air tightness test is started, wherein the n equals to t*f, the t is test time and the f is a video frame rate; and taking the N frames of the images as I1, I2,..., In, graying Ii and acquiring a corresponding grey-scale map Gi, wherein thei equals to 1, 2,...,n; and step3, considering the continuity of bubbles, calculating the number Q of connected images Fj in which the number of connected domains wj is greater than k in the n framesof the connected images Fj, if the Q is greater than a threshold T, considering that there is an air leakage condition. The method has an advantage that based on the connected domain determination, through combining the sizes and the number of the bubbles, and a dynamic characteristic, whether a pressure vessel has the air leakage condition can be accurately determined.

Description

technical field [0001] The invention belongs to the field of special equipment safety supervision and inspection, and in particular relates to a method for detecting the airtightness of a pressure vessel in a water immersion method based on connected domain judgment. Background technique [0002] Pressure vessel is a common equipment for storing gas or liquid, which belongs to the category of special equipment. Pressure vessels with quality hazards will not only affect the function of the product itself, but also cause fire, explosion and other dangerous events in serious cases. Therefore, air tightness testing of pressure vessels during the production process is an important link to ensure quality. [0003] Most domestic manufacturers of pressure vessels use the water immersion method for airtightness testing. The traditional method determines the airtightness of pressure vessels by manually observing the bubbles in the water. However, long-term uninterrupted testing can ea...

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Application Information

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IPC IPC(8): G01M3/10G06T7/00G06T7/136G06T7/187
CPCG01M3/10G06T7/0002G06T7/136G06T7/187
Inventor 高飞尤黄宇王孖豪卢书芳张元鸣陆佳炜张永良肖刚
Owner ZHEJIANG UNIV OF TECH
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