JPH01297582A - Buried object probing device - Google Patents

Abstract

PURPOSE:To exactly discriminate a buried object by displaying only a reflected waveform of the buried object without displaying a reflection of a structure body and the surface of the ground. CONSTITUTION:When a radar wave is radiated from an antenna 1, only a reflected wave 10 from a concrete structure body surface 8 is inputted to a storage circuit 5 from a transmitting and receiving circuit 4 and stored 5. Subsequently, when the antenna 1 is moved and approaches the upper part of a reinforcing bar 9, both a reflected wave from the concrete structure body 8 and a reflected wave of the reinforcing bar 9 are inputted to an arithmetic circuit 6 from the transmitting and receiving circuit 4. In this case, in the arithmetic circuit 6, a difference between a reflected wave 11 in which the reflected wave from the structure body surface 8 and the reflected wave of the reinforcing bar 9 have been synthesized, and the reflected wave 10 from the structure body surface 8 is calculated. Next, a waveform 12 of its difference, that is, the reflected wave signal 12 of the reinforcing bar 9 is calculated, and displayed on a display circuit 7. In such a way, a buried object (reinforcing bar) can be discriminated exactly.

Description

[Detailed description of the invention] [Industrial application field]

TECHNICAL FIELD The present invention relates to a buried object exploration device that uses radar to explore structures such as concrete or objects buried in the ground.

[Conventional technology]

A schematic diagram of a buried object detection device using radar is shown in FIG. The device consists of an antenna 1 and a main body display 3, which are connected by a cable 2. The main body display 3 includes a circuit for transmitting and receiving radar radio waves, and a circuit for signal processing the received reflected waves, converting them into video signals, and displaying the video signals. Move the antenna l along the concrete surface 8 of the structure or the ground, and locate buried objects 9 within the field of view of the antenna l.
If not, the main unit display 3 will show the reflected waveform 1 of the concrete surface 8.
Display 1. If there is a buried object 9 within the field of view of the antenna l, the reflected waveform 1
1 appears, and the existence and position of the buried object 9 can be known from the difference between the reflected waveform lO and 11.

[Problem to be solved by the invention]

In such a buried object exploration device, when the buried object 9 is shallow, the reflected waveform 11 from the buried object 9 is displayed such that the reflected waveform ttb of the concrete surface 8 and the reflected waveform 11a of the buried object overlap. Therefore, it has sometimes been difficult to determine whether only the reflected waveform of the concrete surface is displayed or whether the reflected waveform of the buried object is also displayed in an overlapping manner. The present invention was made to eliminate these drawbacks, and it displays only the reflected waveform of buried objects without displaying the reflections of structures or the surface of the ground, making it possible to accurately identify buried objects. The purpose is to provide a buried object exploration device that can be used.

[Means for Solving the Problems] A buried object exploration device to which the present invention is applied to solve the above problems will be explained with reference to FIG. 1 corresponding to an embodiment. As shown in the figure, the buried object exploration device according to the first aspect of the present invention includes a circuit 7 that receives reflected waves of radio waves transmitted toward a structure or the ground using an antenna l and displays the reflected waveform. In a device that performs exploration by displaying the presence and position of a buried object 9 inside a structure or the earth, a memory circuit 5 that stores the reflected wave signal from the antenna l and outputs it after a time delay is used. It is characterized by having a circuit 6 that calculates the difference between the time-delayed reflected wave signal input from the memory circuit 5 and the reflected wave signal from the antenna l, and a circuit 7 that displays the waveform of the difference signal. As shown in the figure, the buried object exploration device according to the second aspect of the present invention includes a circuit 7 that receives reflected waves of radio waves transmitted toward a structure or the ground using an antenna 1 and displays the reflected waveform. , a storage circuit 5 that stores and outputs a fixed-form signal simulating a reflected wave signal from the surface 8 of the structure or the earth, in a device that performs exploration by displaying the presence and position of a buried object 9 inside a structure or the earth. , a circuit 6 that calculates the difference between the regular signal inputted from the storage circuit 5 and the reflected wave signal from the antenna, and a circuit 7 that displays the waveform of the difference signal.

[Effect]

In the buried object exploration device of the first invention, the reflected wave signal 10 from the structure or the surface 8 of the earth is stored in the storage circuit 5.
Difference signal 12 with reflected wave signal 11 input with a time delay
That is, the waveform of the reflected wave signal 12 of the buried object 9 is displayed. In the buried object exploration device of the second invention, a fixed signal 10 simulating a reflected wave signal from a structure or the surface 8 of the earth is stored in the memory circuit 5, and this fixed signal 10 and the reflected signal 10 manually input from the antenna 1 are stored in the storage circuit 5. A difference signal 12 from the wave signal 11, that is, a waveform of the reflected wave signal 12 of the buried object 9 is displayed.

【Example】

Hereinafter, one embodiment of the present invention will be described in detail. FIG. 1 is a block diagram of an embodiment of a buried object exploration device to which the present invention is applied. In the figure, 1 is an antenna, 2 is a connection cable, 3 is a main body display, a transmitter/receiver circuit 4, and a memory circuit 5.
It is assumed that reinforcing bars 9, which are buried objects, are buried in a shallow part inside the concrete structure, including the arithmetic circuit 6 and display circuit 7. 8 is the surface of the concrete structure. As shown in the figure, first, the antenna l is installed on a concrete surface with no buried objects inside. So the antenna
When radar waves are emitted from the concrete structure surface 8, only the reflected waves from the concrete structure surface 8 are inputted from the transmitting/receiving circuit 4 to the memory circuit 5 and stored therein. IO radiates the radar wave while moving the antenna 1 in the direction of the arrow along the concrete structure surface 8 in the 8th order, which is the reflected waveform at this time, that is, the waveform of the reflection occurring on the surface 8. When the antenna 1 eventually reaches above the reinforcing bars 9, both the reflected wave from the concrete structure surface 8 and the reflected wave from the reinforcing bars 9 are input from the transmitting/receiving circuit 4 to the arithmetic circuit 6. 11 is a reflected waveform at this time, that is, a waveform in which the reflection occurring at the surface 8 and the reflection occurring at the reinforcing bar 9 overlap. On the other hand, as described above, only the reflected waves from the concrete structure surface 8 are stored in the memory circuit 5, and are inputted to the arithmetic circuit 6. In the calculation circuit 6, a reflected wave 10 is obtained by combining the reflected wave from the concrete structure surface 8 and the reflected wave from the reinforcing bars 9. The difference from the reflected wave 11 from the concrete structure surface 8 is calculated. 12 is the waveform of the difference, that is, the waveform of reflection occurring at the reinforcing bar 9. The reflected waveform 12 is displayed on the display unit 3 by the display circuit 7, and only the reflected wave from the reinforcing bar 9 is shown, so that the existence and position of the reinforcing bar 9 can be determined easily and accurately. Since there is little difference in the reflected waves occurring on the concrete structure surface 8 depending on the type of concrete, this can also be carried out by fixing the reflected waveform lO and storing it in the memory circuit 5. By doing so, it is possible to omit the operation of searching in advance a part of the concrete structure that is not affected by buried objects and storing the reflected waveform of only the surface.

【Effect of the invention】

As explained above, in the buried object detection device of the present invention, in a structure like concrete, which has uniform characteristics and a nearly flat surface, the reflected waves generated on the surface are almost the same regardless of the location. Applying the property of Only the reflected waveform of the buried object is displayed without displaying the reflection of the buried object.As a result, exploration and measurement of buried objects at shallow depths can be performed accurately.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a buried object exploration device to which the present invention is applied, and FIG. 2 is a block diagram of a conventional example. l...Antenna 2-...Connection cable 3
...Main unit display 4...Transmission/reception circuit 5...
-Memory circuit 6...Arithmetic circuit 7...Display circuit 8...Surface of structure 9...Buried object lO...Surface reflection waveform 11...Waveform where surface reflection and buried object reflection overlap 12... Waveform of buried object reflection

Claims (1)

[Claims] 1. A buried object inside a structure or the ground, which has a circuit that receives reflected waves of radio waves transmitted from the antenna toward the structure or the ground, and displays the reflected waveform. In a device that performs exploration by displaying the presence and position of 1. A buried object exploration device comprising: a circuit for calculating a difference between a wave signal and a circuit for displaying a waveform of the difference signal. 2. It has a circuit that receives reflected waves of radio waves transmitted from the antenna toward the structure or the ground and displays the reflected waveform, and displays the presence and position of buried objects inside the structure or the ground. In a device that performs exploration by A buried object exploration device characterized by having a circuit for calculating and a circuit for displaying a waveform of a difference signal.