Method for determining the number of acquired pressure sensitive paint (PSP) test images

A technology for image acquisition and method determination, applied in aerodynamic tests, machine/structural component testing, measuring devices, etc., can solve problems affecting test efficiency and cost, increase test time and image processing time, and achieve reasonable control The effect of improving test time and test efficiency

Active Publication Date: 2018-07-24
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of eliminating random image noise, the more images collected, the better. However, in the engineering application of wind tunnel tests, the increase in the number of images collected means that the test time and image processing time will increase, which will eventually affect the accuracy of the test. efficiency and cost

Method used

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  • Method for determining the number of acquired pressure sensitive paint (PSP) test images
  • Method for determining the number of acquired pressure sensitive paint (PSP) test images
  • Method for determining the number of acquired pressure sensitive paint (PSP) test images

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A method for determining the number of images collected in a single-component pressure-sensitive paint test, such as figure 1 shown, including the following steps:

[0034] Step 1. Install the PSP optical measurement system. The main equipment light source and CCD camera of the system are installed perpendicular to the area to be measured in the model; statically debug the PSP optical measurement system: set the camera parameters, including the aperture, under the condition of meeting a certain light intensity , Exposure time and focal length, the setting principle is to set the aperture and exposure time under the condition of ensuring image depth of field and light intensity, after the focal length is adjusted in place, the model PSP measurement area and marking points are clear;

[0035] Step 2. Conduct the first PSP test: use the method of continuously collecting the same number of images, and collect in order to obtain the background image set I before the test b...

Embodiment 2

[0044] A method for determining the number of images collected in a two-component pressure-sensitive paint test. When applicable to a two-component pressure-sensitive paint, in the steady-state pressure measurement test, refer to the steps in Example 1 to calculate the pressure-sensitive components respectively and the signal-to-noise ratio of the reference component images, respectively determine the average number of converged images, and use the larger average number of images as the number of image acquisitions.

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Abstract

The invention discloses a method for determining the number of acquired pressure sensitive paint (PSP) test images. The method comprises installing and statically debugging a PSP optical measurement system; completing a first PSP test and obtaining in order a pre-test background image set, a windless image set, a windy image set, and a post-test background image set by using a manner of continuously acquiring the same number of images; preprocessing the PSP image and calculating a ratio image; performing model region image segmentation and erosion processing to obtain a model region in the image; calculating the signal-to-noise ratio of the ratio image, and the signal-to-noise ratios of all ratio images; according to the average number of the images and the signal-to-noise ratio curve, determining the average number of images when the signal-to-noise ratio of the ratio image converges as the image acquisition number of the subsequent test. The method is applicable to various test environments, and can rationally control test time and improve test efficiency while ensuring data quality.

Description

technical field [0001] The invention belongs to the technical field of aerospace aerodynamic wind tunnel tests, and in particular relates to a method for determining the number of images collected in a pressure-sensitive paint test. Background technique [0002] Pressure Sensitive Paint (Pressure Sensitive Paint, PSP referred to as pressure-sensitive paint) measurement technology is a new non-contact optical pressure measurement method based on the principle of polymer photoluminescence and oxygen quenching. Under the premise of measuring the global pressure on the surface of the model, the time and economic benefits of the traditional pressure hole method are significantly improved. Since it was put forward, PSP measurement technology has been widely concerned and deeply researched by research institutions at home and abroad because of its huge development potential and technical advantages. It has been widely used in wind tunnel tests, engine internal flow, and micro-flow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 黄辉熊健黄昊宇洪兴福李国帅王红彪刘祥李平马护生别炎华
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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