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This post was last edited by Mr. Erdong on 2021-6-22 at 10:40. It originated from BS3971 and later played an important role in pipeline radiography. The origin and use of quality indicators: A dual-wire quality indicator is a type of image quality indicator that differs from linear quality indicators both in structure and function. This type of quality indicator was initially standardized by the British standard BS 3971:1980; it is used together with linear quality indicators or stepped-aperture quality indicators to determine the clarity of radiographic images. Below are introductions to two of the most common dual-filament quality meters, which are also among the essential auxiliary consumables for ray inspection. If you need to purchase such dual-filament quality meters, please visit: www.chianndtmarket.com. The dual-filament quality meters D13/D15/D17 are primarily used in X-ray applications, especially in digital X-ray applications, to assess the geometric imperfections of images (both film and digital images). The basic spatial resolution of digital images is evaluated in accordance with EN 13068 (Radioscopy), EN 14784 and ISO 16371, ISO 17636-2 or ASTM E2597 as well as ASTM E 2737. ASTM E2903 explains the use in dual-wire quality meter applications for the measurement of the focal spot size of microfocal X-ray tubes. The dual-wire astigmatometer is primarily used in X-ray applications, especially in digital X-ray systems, to assess the geometric blur of images (both film and digital images). There are three versions available: D13/D15/D17. Schematic diagram of the phasometer line numbers