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A pressure vessel airtightness detection method based on area division

A technology of air tightness detection and pressure vessel, which is applied in the liquid tightness measurement using liquid/vacuum degree, by detecting the appearance of fluid at the leakage point, the direction of the instrument, etc., can solve the problem that the detection algorithm cannot be applied to the actual scene, etc., to achieve The effect of accurate judgment

Active Publication Date: 2020-01-07
ZHEJIANG UNIV OF TECH
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Problems solved by technology

Therefore, the detection algorithm of shooting bubbles from the side cannot be applied to the actual scene

Method used

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  • A pressure vessel airtightness detection method based on area division
  • A pressure vessel airtightness detection method based on area division
  • A pressure vessel airtightness detection method based on area division

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Embodiment Construction

[0035] The specific embodiments of the computer vision-based air tightness detection method for a pressure vessel of the present invention will be described in detail below with reference to the examples.

[0036] A method for detecting air tightness of pressure vessels based on computer vision, which specifically includes the following steps:

[0037] Step 1: Set the original pressure value of the pressure vessel to P 0 , the pressure value after T time is P 1 , when P 1 -P 0 When ≤Δ, Δ is the pressure difference threshold, it means no pressurization; when P 1 -P 0 When >Δ, it means that it is pressurizing, and the air tightness test starts;

[0038] Step 2: Take n-frame images of the video after the air-tightness test starts, n=t*f, where t is the test duration, and f is the video frame rate; mark n-frame images as I 1 ,I 2 ,...,I n , for I i , i=1,2,...,n for grayscale to obtain the corresponding grayscale image G i ; In this embodiment, the resolution of the orig...

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Abstract

The invention discloses a pressure vessel air tightness detection method based on area division. The method comprises the following steps of step1, setting the original pressure value of a pressure vessel to be P0, setting a 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; and 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 gray-scale map Gi, wherein the i equals to 1,2,...,n. The method has an advantage that based on the area division, through combining the sizes and the number of the bubbles, and a dynamic characteristic, the air tightness of a pressure vessel can be accurately determined and simultaneously an air leakage area can be accurately positioned.

Description

technical field [0001] The invention belongs to the field of safety supervision and inspection of special equipment, in particular to a method for detecting the air tightness of a pressure vessel in a water immersion method based on area division. Background technique [0002] A pressure vessel is a common device for storing gas or liquid and belongs to the category of special equipment. In addition to affecting the function of the product itself, the pressure vessel with hidden quality risks will also cause dangerous events such as fire and explosion in severe cases. Therefore, the air tightness test of the pressure vessel during the production process is an important link to ensure quality. [0003] Most domestic pressure vessel manufacturers use the water immersion method for air tightness testing. The traditional method determines the air tightness of the pressure vessel by manually observing the air bubbles in the water. However, long-term uninterrupted testing can easi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/10G06T7/00G06T7/11G06T7/136G06T7/155G06T7/194G06T7/62
CPCG01M3/10G06T7/0004G06T7/11G06T7/136G06T7/155G06T7/194G06T7/62G06T2207/10016G06T2207/30164
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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