CN2586134Y - Fiber glass array imaging prober - Google Patents

Abstract

The optical fiber array imaging detector of the utility model is characterized in that scintillation optical fibers of a certain length are arranged and fixed in a two-dimensional plane array along a direction parallel to the detected rays. The object to be measured is placed between the ray source and the optical fiber array imaging detector. After the ray passes through the object to be measured, a projected image of the ray is formed on a plane of the detector. These rays are absorbed by the scintillation fiber and converted into energy into flashing light, that is, an optical image corresponding to the ray projection image is formed on another plane; then the optical image can be converted into a video signal by using a high-sensitivity CCD sensor to realize real-time display and real-time image acquisition. The optical fiber array imaging detector has the advantages of high sensitivity and simple structure, and is suitable for real-time detection of x-ray and r-ray imaging of various energies; it can be widely used in military, industrial non-destructive testing, biomedical engineering and many other fields.

Description

A fiber optic array imaging detector

Technical field:

The utility model relates to the imaging detection technology of rays, in particular to an optical fiber array imaging detector.

Background technique:

The material or human body to be studied is transmitted by X-rays, and a transmission image can be formed on a flat detector. Through the analysis of this image, it is possible to detect the material or the internal situation of the human body, and carry out scientific research or medical examination.

In the above research process, planar imaging detection is a key link. If the detection sensitivity is high and the imaging resolution is high, more accurate results can be obtained under the same ray source (such as X-ray source, r-ray source, accelerator ray source, etc.). According to the first chapter of Chapter 6 of "Chinese Imaging Medicine" edited by Chen Shixian and others, fluorescent screens are commonly used at home and abroad to sense the transmitted rays such as X-rays to form fluorescent images, such as the fluorescent screen of a medical X-ray machine. This is more suitable for low-energy rays, but the sensitivity is not high, the detection efficiency is low, and it is not suitable for detecting high-energy rays. This is far from the current scientific research and the needs of modern medicine. Although the image intensifier can improve the brightness of the fluorescent screen image, the image intensifier is a large vacuum tube and requires a high voltage to work normally, and it is also not suitable for detecting high-energy rays. According to the first section of the first chapter of the fifth chapter of the book, an imaging plate (IP) has been used as a planar image detector at present, but the structure is complex and expensive, and it is not suitable for detecting high-energy rays.

For a long time, researchers have been exploring and researching detectors with high sensitivity, high resolution, simple structure, applicable to various energies, various rays, and radiography detection in various situations. So far, there is no report on the use of optical fiber arrays to form imaging detectors.

Technical content:

The purpose of the utility model is to propose an optical fiber array imaging detector with high sensitivity and high resolution ray detection lattice formed by scintillation optical fiber.

This optical fiber array imaging detector is characterized in that it consists of scintillating optical fibers of a certain length arranged in a two-dimensional plane array along a direction parallel to the detected rays, and the two ends of the optical fiber array are two planes that are polished and flat.

When in use, the object to be measured is placed between the ray source and the optical fiber array imaging detector, and after the ray passes through the object to be measured, a projection image of the ray is formed on a plane of the detector, and these rays are absorbed by the scintillating optical fiber and Convert its energy into scintillation light, that is, form an optical image corresponding to the ray projection image on another plane. Then the high-sensitivity CCD sensor can be used to convert this optical image into a video signal to realize real-time display and real-time image acquisition.

The optical fiber array imaging detector of the utility model has the advantages of high sensitivity and simple structure, is applicable to x and r rays of various energies, and can perform real-time detection of ray imaging; it can be widely used in military, industrial nondestructive testing, and biomedical engineering and many other fields.

Description of drawings:

Figure 1 is a structural diagram of an optical fiber array detector;

Figure 2 is a block diagram of the overall experimental scheme of the transient transmission image detection system.

Detailed ways;

Example 1:

For parallel ray sources, the optical fibers can be arranged in parallel, and the scintillation optical fibers 1 of the same length are arranged in a two-dimensional planar array along the direction parallel to the detected ray 4, and the optical fiber array The two end faces of the laser beam are ground into two flat planes, which constitutes a two-dimensional planar ray fiber array imaging detector.

The side lengths X and Y of the detector can be determined according to the size of the image to be measured. The thickness of the detector is closely related to the detection sensitivity and the energy of the detected radiation, which can be selected within tens of centimeters. The diameter of the optical fiber determines the pixel size of the image, and a plastic scintillation optical fiber with a diameter of 0.1-1mm can be selected.

In this embodiment, the outer phase 2 of the detector is made of aluminum, and the actual dimensions are: X=36mm, Y=45mm, L=40mm; the diameter of the scintillation fiber is 1mm.

In this embodiment, a 45Kev/5mA medical x-ray machine is used as the x-ray source.

Figure 2 is a block diagram of the overall experimental scheme of the transient transmission image detection system.

During the experiment, the measured object 5 is placed between the 45Kev/5mA medical x-ray machine and the optical fiber array detector 3; the X-ray 4 passing through the object 5 is projected on the measurement plane at one end of the optical fiber array detector 3, forming A projected image of rays, these rays are absorbed by the scintillation optical fiber 1 and its energy is converted into scintillation light, and a scintillation luminous image corresponding to the projected image of the object 5 is produced on the other end plane of the fiber array detector 3; Under the triggering of synchronous trigger signal 8, this luminous image is accepted by large-aperture lens high-sensitivity CCD sensor 6, and is converted into image video signal; The video signal is converted into a digital signal, processed by the data processor 10 in real time, and then sent to the display 11 to display the perspective image of the measured object.

Claims (1)

1. An optical fiber array imaging detector, characterized in that it consists of a fixed length of scintillation optical fibers arranged in a two-dimensional plane array along a direction parallel to the detected rays, and the two ends of the optical fiber array are two planes that are ground flat .

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