JPH07294198A - Mine detector - Google Patents

Abstract

PURPOSE:To realize a mine detector which can detect a mine made of no-metal and efficiently execute a detecting operation. CONSTITUTION:The mine detector comprises a neutron generation source 4 for irradiating the surface of the ground 17 with neutrons 7, a detector 15 for detecting gamma-rays 9 from the surface of the ground 17, a pulse-height analyzer 18 for inputting a detection signal from the detector 15, and a survey meter 19 inputting a specific energy spectrum from the analyzer 18 to measure a dose rate, thereby discriminating the presence or absence of a mine 11, wherein a mine made of non-metal such as plastic, etc., which has been heretofore impossible to be detected by a conventional unit can be detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a landmine exploration device for nondestructively exploring landmines buried underground.

[0002]

2. Description of the Related Art A conventional mine exploration device has an antenna 23 attached to the tip of a body 22 as shown in FIG.

At the time of landmine exploration using this device, the electromagnetic wave 24 generated from the antenna 23 causes the landmine 1 of the underground 16
1 and the induced current 25 flows in the land mine 11, and the land mine 1
An electromagnetic field 26 is formed in the vicinity of 1. This electromagnetic field 26 was detected by the antenna 23 from the surface of the earth 17, and the operator 21 judged the presence or absence of the land mine 11.

[0004]

In the conventional mine exploration device, since the induced current is used, only mines made of highly conductive material such as metal can be explored, and non-metal such as plastic is used. There was a problem that it could not cope with land mines.

Further, there is a problem that the time expended for exploration becomes enormous because of exploration by human power. The present invention is intended to solve the above problems.

[0006]

The mine exploration apparatus of the present invention comprises a neutron source for irradiating the ground surface with neutrons,
A detector that detects γ-rays from the ground surface, a wave height analyzer that inputs the detection signal from the detector and selects only a specific energy spectrum from the signal, and a specific energy spectrum from the analyzer. It is equipped with a survey meter that determines the presence or absence of land mines.

[0007]

[Function] In the above, when the ground surface is irradiated with neutrons oscillated from a neutron source, when a landmine is buried in the ground, the nitrogen element in the landmine captures the neutrons and emits a γ ray of a specific energy spectrum. To do.

This gamma ray is detected by the detector, the detection signal from the detector is input to the wave height analyzer, and only the specific energy spectrum is selected by the analyzer, and then sent to the survey meter. The survey meter that inputs this specific energy spectrum measures the dose rate from this and determines the presence or absence of land mines based on the magnitude of the dose rate.

[0009]

FIG. 1 shows a landmine exploration apparatus according to an embodiment of the present invention.
Will be described. In the present embodiment shown in FIG. 1, an arm 3 is provided in the front part via a swivel base 2 and a ground surface 17 formed by wheels 12 is provided.
A vehicle 1 capable of self-propelling above, a shield container 5 disposed at the tip of the arm 3 and having an opening, and a gap shield 8 provided in the opening, formed of a light element such as plastic, and the shield container. 5, a neutron oscillation source 4 having an oscillation port 6 directed to the opening, a detector 15 provided in the shield container 5 for detecting γ rays 9, a detector 15 mounted on the vehicle 1 Further, it is provided with a wave height analyzer 18 for inputting the detection signal thereof, and a survey meter 19 for inputting the output signal from the wave height analyzer 18 to measure the dose rate and determine the presence or absence of land mines.

The vehicle 1 is provided with an explosive device 20 for treating land mines 11 in the ground 16 at the lower front portion thereof, and a generator 14 for supplying electric power to various devices at the upper portion thereof.
A control panel 13 for controlling various devices is installed.

When the landmine 11 is searched using the apparatus of this embodiment, the main body of the vehicle 1 is moved forward at a slight speed, and the arm 3 is rotated at a slight speed around the swivel base 2. At this time, the arm 3 is moved up and down and adjusted so that the gap between the shield container 5 and the surface 17 does not become large. Although not shown in FIG. 1, the movement and position control of the vehicle 1 and the arm 3 can be automatically performed by using a displacement gauge or the like.

During the above operation, the neutron 7 is emitted from the oscillation port 6 of the neutron oscillation source 4 toward the ground 16. When the neutrons 7 applied to the ground 16 are applied to the land mine 11 buried in the ground 16, the neutrons 7 are captured by the nitrogen element contained in the explosive 10 in the land mine 11 in a large amount.

At this time, the nitrogen element radiates γ rays 9 having an energy spectrum (10.8 MeV) peculiar to the nitrogen atom. The γ-ray 9 is detected by the detector 15, the acquired signal is transmitted to the wave height analyzer 18 to extract a specific spectrum, and the survey meter 19 measures the dose rate by the specific spectrum.

When there is no land mine, the dose rate is very small, and the presence or absence of land mine 11 can be discriminated by this difference. The reason why the oscillation source 4 is shielded by the shield container 5 and the gap shield 8 is to prevent neutrons from scattering to the surroundings and to ensure safety.

In this embodiment, an explosion detonation device 20 is provided in the lower part of the front part of the vehicle. When the presence of the land mine 11 is detected, the device 20 safely disposes of the land mine 11.

Further, although the oscillation source 4 of the neutron 7 is not particularly limited, it is electrically controllable and easy to handle and manage. Therefore, in this embodiment, the accelerator using the DD reaction is used. Are using. Here, the DD reaction is
Ionize deuterium with an ion source, accelerate it with a voltage of up to 125 KV, and irradiate the target that occludes deuterium.
It is a reaction that produces helium and neutrons.

[0017]

INDUSTRIAL APPLICABILITY The landmine exploration device of the present invention inputs a neutron source for irradiating the ground surface with neutrons, a detector for detecting γ rays from the ground surface, and a detection signal from the detector. By using a wave height analyzer and a survey meter that inputs a specific energy spectrum from the analyzer to measure the dose rate and determine the presence or absence of landmines, plastic and other materials that were not possible with conventional equipment were used. Enables exploration of metal mines.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a land mine exploration device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a conventional land mine exploration device.

[Explanation of symbols]

 1 vehicle 2 swivel base 3 arm 4 oscillation source 5 shield container 6 oscillation port 7 neutron 8 gap shield 9 gamma ray 10 explosive 11 landmine 12 wheel 13 control panel 14 generator 15 detector 16 underground 17 surface height 18 wave height analyzer 19 survey meter 20 Explosion device

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kiichi Kobayashi 3000 Tana, Sagamihara City, Kanagawa Mitsubishi Heavy Industries, Ltd. Sagamihara Works

Claims (1)

[Claims] 1. A neutron source for irradiating neutrons to the ground surface, a detector for detecting γ-rays from the ground surface, a detection signal from the detector, and a specific energy spectrum from the signal. A landmine exploration device, comprising: a wave height analyzer for selecting only a selected one and a survey meter for inputting a specific energy spectrum from the analyzer to determine the presence or absence of a landmine.