JPH0385432A - Inspecting apparatus by neutron beam - Google Patents

Abstract

PURPOSE:To enable immediate detection of the position of a defective component by applying neutrons to a sample from the right and the left alternately from two neutron beam sources made to be close to each other moderately. CONSTITUTION:Neutron beams 6 (6a, 6b) generated from neutron ray sources 1 (1a, 1b) are applied alternately to a sample 5 through a shutter 13 rotated by a motor. The neutron rays 6 applied to the sample 5 are converted into visible lights by a converter 2 and picked up by a video camera 3, and they are projected as a neutron-ray fluoroscopic image on a TV monitor 4. Besides, the rotational position of the motor is detected by a sensor 14 connected to the motor 12 and a signal thereof is sent to an eyepiece 15. Accordingly, each neutron image an be seen for an observer 16 as if it were observed by both eyes simultaneously, and therefore the neutron-beam image is observed as a stereoscopic image due to an effect equivalent to a stereoscopic vision by a stereoscopic pair. Thereby the position of a defective component can be detected immediately.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to each part of a mechanism made of a metal material, such as a flow rate riJ regulator, for example. The present invention relates to a neutron beam inspection device that non-destructively detects defective or missing resin parts in mechanical parts such as three-dimensional structures in which resin parts are placed.

[Conventional technology]

FIG. 4 is a diagram showing a conventional neutron beam inspection device, and in FIG. 2 (11 is a neutron beam source, (2) is a converter).

(3) is a video camera, (4) is a TV monitor, and (5) is a sample.

(6) is a neutron beam. Moreover, FIG. 5 is a diagram showing the detailed structure of sample (5), in which (7) is a metal mechanical part including a defective resin part, and (8) is a TI! The resin part 9) is a defective resin part. Moreover, FIG. 6 is a diagram showing a fluoroscopic image of the sample (II is a neutron beam image seen from the A plane, and (11) is a neutron beam image seen from the B plane.

A conventional neutron beam inspection device is configured as described above.2 For example, a sample (5) is placed on a converter (2), and the sample (5) is irradiated with a neutron beam (6) generated from a neutron beam source (1). As a result, the neutron beam (6) that has passed through the inside of the sample (5) is converted by the converter (2) into a visible light image like the scream in Figure 6 (a), and this image is transmitted to the video camera ( 3), the image is taken on a TV monitor (4), and the presence or absence of defects inside the sample (5) is detected by observation.

Note that the defect referred to here is a crack in a resin part.

Chips 2 Refers to bends, etc., or missing parts themselves.

[Problem to be solved by the invention]

In the conventional neutron beam inspection equipment as described above, a plurality of vI4I4 parts are arranged as a sample as shown in Figure 2.
In 5), the defective resin part (9) overlaps with another resin part (8), and as shown in the neutron beam image (11), it is not clear whether one of the parts has a defect after pvJ. Therefore, a large amount of time is required to detect the position of the defective 418 resin part (9) by rotating or tilting the position of the sample (5) from the outside.

The present invention has been made to solve this problem, and aims to provide a neutron beam inspection device that can three-dimensionally observe a sample (5) without changing its position from the outside.

[Means to solve the problem]

The neutron beam inspection device according to the present invention has two neutron beam sources, and uses a shutter to send neutron beams from the neutron beam alternately on the left and right sides, and also shoots a neutron beam image with a video camera and displays the image on a TV monitor. At the same time, the TV monitor is observed through a Ui mirror whose left and right fields of view alternately open and close in synchronization with the opening and closing of the shutter.

[Function] In this invention, by irradiating the sample with neutron beams alternately on the left and right sides from two neutron beam sources placed appropriately close to each other, the neutron beam can be immediately irradiated into the mechanical parts from the outside without rotating or tilting the sample. The position of a certain defective resin part can be detected. Moreover, neutron MT, which was not possible in the past,
It also enables stereoscopic viewing of V images.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) to (6) are exactly the same as the conventional device described above, (12) is a motor, (13) is a resin shutter that is rotated by the motor (12) and shields neutron beams, (14) ) is a sensor that detects the rotational position of the shutter (13), (15) is a pair of glasses that alternately blocks the left and right visual field in synchronization with the position of the shutter (13), (1[i)
is an observer wearing glasses (15) and looking at the monitor (4). Figure 2 also shows the rotation of the shutter (13) and the neutron generation point (hereinafter referred to as focal point) of the neutron source that is pressed against it.
This is a diagram showing the relationship between the glasses (15) and glasses (15) during operation.
) are the focal points corresponding to each of the neutron sources (Ia) and (Ib). Also, Figure 3 shows the monitor (4) and the II mirror (1).
5) and an observer (16),
Figure 3(a) shows the glasses (1) during the operation of Figure 2(a).
Similarly, Fig. 3(b) shows the state of Fig. 2(b).
It corresponds to the operation of

The operation will be explained below.

The neutron beam (6) first generated from the neutron beam source (1) is pressed by the shutter (13) rotated by the motor (7), and the neutron beam generated from the focal point (17 m) as shown in Figure 2 (a). The beam (6a) is irradiated onto the sample (5),
The neutron beam (6 turtles) that passes through the inside of the sample (5) is converted into visible light by the converter (2), and the video camera (3)
The image is photographed by a neutron beam fluoroscopic image and displayed on a TV monitor (4). On the other hand, the rotational position of the motor (8) is detected by a sensor (10) connected to the motor (12).

This signal is eye-catching! Sent to (Is). The glasses (15) are placed on the eyes of the observer (16) and block the left eye of the observer (16) according to the signal from the sensor (9) as shown in FIG. 2(a). At this time, the observer (16) observed that the neutron beam image of the sample (5) was slightly lower than the neutron beam image that was viewed vertically below the sample (5) as in the past. (5) You are looking at the tilted image with your left eye. Further, the shutter (13) rotates and becomes secondary (see Fig. 2).
As shown in b), the neutron beam (6b) generated from the focus (17h) is irradiated onto the sample (5), and the observer (16) is similarly irradiated with the neutron beam (6b).
will see an image of the sample (5) tilted from the other position.

The above operations are repeated in a relatively short time. At this time, 1
i! Since each neutron beam fluoroscopic image appears to the observer (16) to be observed simultaneously with both eyes, the neutron beam image is observed as a three-dimensional image with an effect equivalent to stereoscopic viewing by stereo photography.

Since the neutron beam inspection device configured as described above can observe neutron beam fluoroscopic images as images with a sense of perspective, it is possible to detect defective resin parts in mechanical parts where multiple one-piece parts are arranged three-dimensionally. It becomes possible to discover or detect the location immediately.

In addition, in the above embodiment, the motor (7) is replaced by the motor (8).
We used a semicircular metal rotating with a neutron source (
It is sufficient that the sensor (9) is connected to the motor (7), but the rotational position of the shutter (8) cannot be detected. The neutron source (1) may be an isotope, cyclotron, nuclear reactor, or other source that generates neutrons. Anything is fine.

〔Effect of the invention〕

As described above, according to the present invention, two
Two neutrons! The structure is such that neutron beams are alternately irradiated onto the sample from a source using a shutter, and the neutron 11 images are displayed on a TV monitor, which is synchronized with the shutter and observed through glasses that alternately open and close the left and right fields of view. The neutron beam image can be viewed three-dimensionally, which has the effect of instantly discovering defects within the sample and accurately ascertaining their locations.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a neutron beam inspection apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the rotation of the shutter, the focal point of the neutron beam forced thereby, and the operation of the glasses, and FIG. [I] A plan view showing the operation of the mirror corresponding to the operation in Fig. 2, Fig. 4 shows a conventional neutron beam inspection device, and Fig. 5 shows the detailed structure of the sample. diagram showing,
FIG. 6 is a diagram showing a perspective image of the sample. In the figure (11 is a neutron beam source, (2) is a converter, (3) is a video camera, (4) is a TV monitor, (5) is a sample. (6) is a neutron beam, and (7) is a metal mechanical part. , (8) is a resin part, (9) is a defective resin part, αω is A
Neutron beam image seen from the surface, (11) is a neutron beam image seen from the B side. (12) is the motor, (13) is the shutter, (14)
is a sensor. (15) is the glasses, (18) is the observer, and (17) is the focus of the neutron source. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] In equipment that inspects the internal structure of mechanical parts using neutrons,
A shutter located below the two neutron beam sources that alternately blocks the neutron beams from these neutron beam sources, a motor that rotates the shutter, and a converter located below the shutter that converts the neutron beam into visible light. , a video camera located below this converter that photographs the neutron beam image, a TV monitor connected to this video camera that displays the neutron beam image, and a shutter located in front of the eyes of the observer viewing the TV monitor. A neutron beam inspection device that is connected to a sensor that detects a rotational position and includes glasses that alternately block left and right visual fields of an observer based on signals from the sensor.