Industry ray detection negative film digitalizer

Abstract

The invention relates to an industrial ray detection film digitalizer, including a shell, an upper substrate and a lower substrate which are arranged in the shell, the left end of the upper substrateis provided with a strip-shaped optical fiber cold light source, the right end thereof is provided with an image collection device, the middle thereof is provided with a film sending device, and the right side of the film sending device is provided with a shading device. The strip-shaped optical fiber cold light source, the film sending device and the shading device are connected with a computer by a control card, the image collection device is connected with the computer by an image collection card and is connected with the control card at the same time. The invention adopts a linear array CCD to collect the image, so as to solve the problems of big distortion of a plane array CCD and slow speed of a point scanning method; the invention adopts the strip-shaped optical fiber cold light source as a background light, so as to solve the problems of serious fever, insufficient light intensity and unevenness and so on of the ordinary light source; the invention adopts the film sending device to hold the film for the movement, so as to realize the progressive scanning to the film, and the invention ensures the precision of the sub-scanning of the linear array CCD by carrying out an external synchronous control of the image collection card by the signals of a round grating sensor which is arranged on the film sending device.

Description

technical field [0001] The invention relates to a digital device for industrial radiation detection film. Background technique [0002] Radiographic testing is one of the important means of industrial non-destructive testing. It has the characteristics of high sensitivity, flexible and convenient use, and can be used to detect workpieces of different thicknesses and shapes. The negative film formed by radiographic inspection contains a wealth of information, reflecting the internal quality of the workpiece under test, and is an important original quality data of the workpiece. For large-scale pressure equipment (such as steam turbine parts), radiographic inspection films need to be preserved for the entire life cycle, that is, before the equipment is decommissioned, all radiographic inspection films of its parts need to be retained, resulting in a large number of film storage and a long time, not only It is difficult to find, cannot be shared, and negatives are lost from ti...

AI Technical Summary

Problems solved by technology

For large-scale pressure equipment (such as steam turbine parts), radiographic inspection films need to be preserved for the entire life cycle, that is, before the equipment is decommissioned, all radiographic inspection films of its parts need to be retained, resulting in a large number of film storage and a long time, not only Difficult to find, unable to share, and loss of negatives occurs from time to time

In addition, the requirements for the storage environment of the film are very high, and the temperature, humidity and electromagnetic environment have strict requirements. Even so, the film will gradually age and deteriorate with the passage of time, resulting in a decline in image quality

Based on the above reasons, film digitalization came into being. There are two main types of existing digital instruments: one is the digital equipment that adopts the laser point scanning method. The photoelectric sensor is used to receive the optical signal transmitted through the film, and the optical signal is converted into the gray value of the image through the processing circuit. Its advantages are high scanning accuracy and small image distortion, but its disadvantages are high cost and slow scanning speed; Array CCD scanning digital equipment, its working principle is to use surface light source to provide backlight, and use area array CCD to obtain images. Larger images require stitching

[0003] In terms of image quality evaluation, there are currently two main methods: subjective evaluation and objective evaluation. Subjective image quality evaluation is greatly affected by subjective factors and is difficult to quantify.

Objective image quality evaluation, using the statistical properties of pixel point distribution to determine image quality, can objectively reflect the overall quality of digital images, but there is no unified standard for image quality evaluation methods specifically for digital images of industrial radiographic inspection films

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