GB/T 35394-2017 in English
VALIDNon-destructive testing—X-ray digital radiography—System properties
- Issued on:2017-12-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$301.00
《GB/T 35394-2017无损检测 X射线数字成像检测 系统特性》由TC56（全国无损检测标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
GB/T 35394-2017 Standard Overview
This standard specifies the equipment requirements, test conditions and performance measurement methods for X-ray digital imaging detection systems, and is applicable to non-destructive testing of metal materials, non-metallic materials, composite materials and other products.
Comparison table of standard frameworks
| Standard dimensions | Content requirements | Technical indicators |
|---|---|---|
| Equipment requirements | Technical parameters of core components such as radiation source, detector, display, etc. | - Radiation source energy ≥50kV - Detector A/D conversion bit number ≥12bit |
| Test conditions | Illumination parameters, filter plate selection, image quality meter use, etc. | - Distance between radiation source and detector 700mm~1000mm - Use dual-line image quality meter and step test block |
| Performance measurement | Contrast sensitivity, spatial resolution, grayscale amplitude, etc. | - Contrast sensitivity ≥ 5% - Basic spatial resolution ≤ 1.5 times the pixel size |
Key term explanation and application cases
Contrast to noise ratio (CNR): It is used to measure the ratio of the signal to the background noise in the area of interest in the image.
For example, when testing aluminum-magnesium alloy, a tube voltage of 90kV and a 1mm thick aluminum filter plate are required to ensure that GV_min ≥ 32% to meet the imaging requirements.
Implementation suggestions
- It is recommended to give priority to the use of high-energy ray systems in actual detection to improve penetration ability
- Regularly calibrate the bad pixels and background noise of the detector to ensure imaging quality
- Select appropriate filter plate material and thickness according to the thickness of the workpiece
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