EN462-5 double wire image quality meter

EN462-5 double wire image quality meter——Measuring scale for geometric unsharpness of radiographic images

Introduction to double wire image quality meter

The style and main dimensions of the double-line image quality meter are as shown in the figureAs shown in 1, the basic structure includes: packaging board, 13 wire pairs, and identification numbers. Each part is bonded to form a certain rigid whole. The wires are made of platinum and tungsten.

Requirements for the material, diameter and spacing between wires of each pair of wires, should comply with the requirements of Table 1. The packaging board includes upper and lower boards. The material is generally hard plastic (or other appropriate low-absorption material boards). The thickness of the lower board is about 1mm.

13 wire pairs are placed in the middle of the upper and lower plates. The wires in a wire pair themselves should be parallel to each other, and the wire pairs should also be parallel to each other. Its appearance is shown in Figure 2, and its actual internal structure is shown in Figure 3.

                      Figure1                                                     Figure2

Figure3

Dual wire image quality meters should be used with linear or hole type image quality meters. It should be placed on the source side of the object being inspected and should be as close as possible to the beam axis and perpendicular to the axis. With the help of4Observe the image of the dual-filament image quality meter with a magnifying glass.For the Z largest line pair, the image is exactly the distance between the two double lines. The image of the transition from two independent lines under the J limit to a single line can be identified. At this time, it is considered to be the distinguishable J limit value. Image is unclearUcan be2dmeans, among whichdis the width of the line and the distance between the lines.

Silk code name       Geometric unclearnessU(mm)             wire diameterd(mm)

13D           0.10                       0.050
12D           0.13                       0.063
11D          0.16                       0.080
10D           0.20                       0.100
9D           0.26                       0.130
8D           0.32                       0.160
7D           0.40                       0.200
6D           0.50                       0.250
5D           0.64                       0.320
4D           0.80                       0.400
3D           1.00                       0.500
2D           1.26                       0.630
1D           1.60                       0.800
The manufacturer should provide a test certificate for each dual-wire image quality meter.