JPH0424471Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention uses radio waves such as microwaves and magnetism to detect underground objects composed of non-magnetic materials and magnetic materials. Regarding a buried object detection device.

(Prior Art) Conventionally, detection involves emitting radio waves from a transmitter, and detecting underground objects by receiving the reflected waves that are reflected by the radio waves and returned by a receiver. The device is known.

Such a detector has a spacing D, as shown in FIG.
A detecting unit 9 which accommodates a transmitting antenna 2 and a receiving antenna 3 installed side by side and is movable horizontally close to the ground 21, a signal generator 1 which generates a transmitting signal, and a receiving signal from the receiving antenna 3. The main body part 10 includes a detection circuit 4, an amplifier circuit 5, and an indicator 8.

In the detector shown in FIG. 3, the radio waves generated by the signal generator 1 are radiated from the transmitting antenna 2, and the radio waves are radiated from the transmitting antenna 2,
B and magnetic material 15C) and is received by the receiving antenna 3. The radio wave received by the receiving antenna 3 is converted into a DC signal by the detection circuit 4, amplified by the amplifier circuit 5, and sent to the indicator 8. The system is configured to detect the presence of the buried object 15A based on the display of the indicator 8.

(Problems to be Solved by the Invention) By the way, in the conventional configuration described above, as shown in FIG. Underground 20 buried objects 15A or buried objects 16
A detection signal 15D or 16D, which is detection information of A (consisting only of non-magnetic material), is obtained. However, the magnetic material 15 that is a component of the buried object 15A
When C is small, the detection signal 15D of the buried object 15A is almost the same as the detection signal 16D of the buried object 16A, which is made entirely of non-magnetic material. It was difficult to distinguish between the objects 15A and 16A, and extra time and effort were required to reliably detect the target buried object 15A composed of the non-magnetic material 15B and the magnetic material 15C.

(Means for solving the problem) The present invention solves the above problems and provides an underground method for reliably, quickly and efficiently detecting only buried objects composed of non-magnetic and magnetic materials. The purpose is to provide a buried object detection device.

The underground object detection device of the present invention includes: (a) a signal generator, a transmitting antenna that receives the output of the signal generator and radiates radio waves, a receiving antenna that receives reflected waves reflected by the underground object; It has a detection circuit that converts the receiving antenna output into a DC signal, an amplifier circuit that amplifies the output of the detection circuit, and a first determination circuit that receives the output of the amplifier circuit and outputs a first determination signal when detecting an underground object. a radio wave detection section; (b) an oscillator; a magnetic detector that receives the output of the oscillator;
a magnetic detection section having a rectifier circuit that rectifies the output of the magnetic detector, an amplifier circuit that amplifies the output of the rectifier circuit, and a second determination circuit that receives the output of the amplifier circuit and outputs a second determination signal when detecting a magnetic substance; and (c) a comprehensive judgment circuit which receives the first judgment signal of the radio wave detection section and the second judgment signal of the radio wave detection section and performs a logical product of both judgment signals to produce a judgment output; and a determination instruction unit having an indicator that receives a determination output.

(d) The transmitting antenna, the receiving antenna, and the magnetic detector disposed near the receiving antenna are housed in a detection unit so as to be close to the ground and can be horizontally moved as one unit. . And, with these (a) to (b) configurations,
The problems of the prior art described above are solved by detecting underground objects made of non-magnetic materials and magnetic materials.

(Function) In the underground buried object detection device of the present invention, a detection signal from a non-magnetic material is obtained by a radio wave detection unit having a signal generator, a transmitting antenna, a receiving antenna, a detection circuit, an amplification circuit, and a determination circuit. So,
A detection signal from a magnetic material is obtained by a magnetic detection unit having an oscillator, a magnetic detector, a rectifier circuit, an amplifier circuit, and a determination circuit, and only when the outputs of both detection signals appear almost simultaneously, the target is detected. A comprehensive judgment circuit makes a logical judgment that the buried object is composed of a non-magnetic material and a magnetic material, and the judgment output is displayed on an indicator. It is possible to detect only buried objects.

(Example) Hereinafter, an example of the underground object detection device according to the present invention will be described with reference to the drawings.

FIG. 1 is a system block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram when a buried object is detected by the configuration of the embodiment of the present invention.

As shown in FIG. 1, the embodiment includes a signal generator 1a, a transmitting antenna 2a that receives the output of the signal generator 1a and radiates radio waves such as microwaves toward the ground, and a transmitting antenna 2a that receives the output of the signal generator 1a and radiates radio waves such as microwaves toward the ground. a receiving antenna 3a that receives reflected radio waves, a detection circuit 4a that detects the output of the receiving antenna 3a and converts it into a DC signal, an amplifier circuit 5a that amplifies the output of the detection circuit 4a, and an amplifier circuit 5a that receives the output of the amplifier circuit 5a. a radio wave detection unit 11a having a determination circuit 6a that outputs a determination signal when detecting an underground object; an oscillator 1b; a magnetic detector 2b disposed near the receiving antenna and receiving the output of the oscillator 1b; A rectifier circuit 4b that rectifies the output of the rectifier 2b, an amplifier circuit 5b that amplifies the output of the rectifier circuit, and a determination circuit 6b that receives the output of the amplifier circuit 5b and outputs a determination signal when detecting a magnetic material.
a magnetic detection section 11b having a magnetic detection section 11b, and the radio wave detection section 1
1a and the magnetic detection section 11b; and an indicator (meter, sound generator, light emitter, etc.) 8c that receives the judgment output of the comprehensive judgment circuit 7c. has been established.

The detection operation for non-magnetic substances is the same as in the case of the prior art described above, and the detection operation for magnetic substances is performed by the magnetic detector 2.
This is done by detecting level fluctuations in the high frequency signal from the oscillator 1b due to the proximity of the magnetic material to the rectifier circuit 4b and the amplifier circuit 5b.

In addition, mechanically, the transmitting antenna 2a, the receiving antenna 3a, and the magnetic detector 2b are housed in the detecting section 9a so that they can be horizontally moved close to the ground as one unit, and the other parts are arranged in the main body. It is stored in 10a.

Next, the case of detecting a buried object in the above embodiment will be explained with reference to FIG.

A detection unit 9a with a transmitting antenna 2a and a receiving antenna 3a arranged on both sides of a magnetic detector 2b is located on the ground 21.
When moving parallel to a in the direction of arrow Xa, underground 20
Due to the presence of the buried object 15a, the radio wave detection unit 11
A detection signal 16a is output from the amplifier circuit 5a of the magnetic detection section 11b, and a detection signal 16b is output from the amplifier circuit 5b of the magnetic detection section 11b. The detection signal 16a becomes a judgment signal 17a in the judgment circuit 6a, and the detection signal 16a becomes a judgment signal 17a.
b becomes a determination signal 17b in the determination circuit 6b.

Since the judgment signals 17a and 17b are output at the same time, the general judgment circuit 7c which looks at the logical product of both outputs outputs a judgment output indicating that there is a target buried object in the underground 20a to the indicator 8c. Buried object 15a composed of non-magnetic material 15b and magnetic material 15c
This will indicate the existence of When the buried object 15a is only the non-magnetic material 15b, only the detection signal 16a appears as the output of the amplifier circuit 5a, and therefore only the judgment signal 17a, and nothing is output from the comprehensive judgment circuit 7c and no signal is sent to the indicator 8c. nothing is displayed.

Therefore, rocks etc. that are only non-magnetic material 15b,
It is no longer possible to confuse the non-magnetic material 15b, which is the detection target, with the buried object 15a, which is made up of a magnetic material 15c.

In the above embodiment, the case where the judgment signal 17a and the judgment signal 17b appear at the same time is illustrated, but depending on the positional relationship between the receiving antenna and the magnetic detector, the judgment signals 17a and 17b may appear at different times. In some cases, the time lag may appear, but in this case, the comprehensive judgment circuit may take the time lag into consideration when making a judgment.

(Effects of the invention) As explained above, the buried object detection device of the invention includes a signal generator, a transmitting antenna, a receiving antenna,
a radio wave detection section having a detection circuit, an amplification circuit, and a determination circuit; a magnetic detection section having an oscillator, a magnetic detector, a rectifier circuit, an amplification circuit, and a determination circuit; By providing a judgment circuit and a judgment instruction unit having an indicator, it is possible to distinguish only underground objects consisting of non-magnetic materials and magnetic materials from rocks, etc., without requiring wasted labor and time, and with certainty. Moreover, it can be detected efficiently in a short period of time.

[Brief explanation of the drawing]

Fig. 1 is a system block diagram showing an embodiment of the underground object detection device according to the present invention, Fig. 2 is an explanatory diagram of the case where a buried object is detected by the configuration of the embodiment of the present invention, and Fig. 3 is a conventional one. System block diagram based on the technology of
FIG. 4 is an explanatory diagram when a buried object is detected by the conventional technique. 1, 1a... signal generator, 1b... oscillator,
2, 2a... Transmission antenna, 2b... Magnetic detector, 3, 3a... Receiving antenna, 4, 4a... Detection circuit, 4b... Rectifier circuit, 5, 5a, 5b...
Amplifier circuit, 6a, 6b... Judgment circuit, 7c... Comprehensive judgment circuit, 8, 8c... Indicator, 9, 9a...
Detection section, 10, 10a... Main body section, 11a... Radio wave detection section, 11b... Magnetic detection section, 11c... Judgment instruction section, 15A, 15a, 16A... Buried object,
15B, 15b...Nonmagnetic material, 15C, 15c...
...Magnetic material, 15D, 16D, 16a, 16b...
Detection signal, 17a, 17b...determination signal, 20,
20a...underground, 21,21a...ground.

Claims (1)

[Claims for Utility Model Registration] A signal generator, a transmitting antenna that receives the output of the signal generator and radiates radio waves, a receiving antenna that receives reflected waves reflected from underground objects, and a DC signal that transmits the output of the receiving antenna. an oscillator; an oscillator; an oscillator; , a magnetic detector that receives the oscillator output, a rectifier circuit that rectifies the output of the magnetic detector, an amplifier circuit that amplifies the output of the rectifier circuit, and a second determination signal that receives the output of the amplifier circuit and outputs a second determination signal when detecting a magnetic substance. a magnetic detection section having a second judgment circuit; a comprehensive judgment that receives a first judgment signal from the radio wave detection section and a second judgment signal from the magnetic detection section, performs a logical product of both judgment signals, and outputs a judgment output; a judgment instruction unit having a circuit and an indicator that receives a judgment output from the comprehensive judgment circuit, and the transmitting antenna, the receiving antenna, and the magnetic detector disposed near the receiving antenna are placed close to the other surface and integrated. What is claimed is: 1. An underground object detection device, characterized in that the underground object is housed in a detection part so as to be horizontally movable, and detects an underground object composed of a non-magnetic material and a magnetic material.