JPH07117584B2 - Buried object exploration equipment - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a buried object exploration apparatus that searches a structure such as concrete or an object buried in the ground by using a radar.

2. Description of the Related Art An outline of a buried object exploration apparatus using a radar is shown in FIG. The device comprises an antenna 1 and a main body display 3, and a cable 2 is connected between them. The main body display 3 includes a circuit for transmitting and receiving radar radio waves, and a circuit for processing the received reflected waves into a video signal and displaying the signal. Move the antenna 1 along the concrete surface 8 of the structure or ground,
If there is no buried object 9 in the field of view of the antenna 1, the main body display 3
The reflected waveform 10 of the concrete surface 8 is displayed on the screen. When the embedded object 9 exists in the field of view of the antenna 1, a reflected waveform 11 appears, and the difference between the reflected waveforms 10 and 11 allows the existence and position of the embedded object 9 to be known.

[Problems to be Solved by the Invention]

With such a buried object exploration device, a reflected waveform from the buried object 9
When the buried object 9 is shallow, 11 is displayed by overlapping the reflected waveform 11a of the buried object with the reflected waveform 11b of the concrete surface 8. Therefore, it has been difficult to determine whether only the reflection waveform of the concrete surface is displayed or the reflection waveform of the buried object is also displayed. The present invention has been made in order to eliminate such a defect, and it is possible to accurately identify an embedded object by displaying only the reflected waveform of the embedded object without displaying the reflection on the surface of the structure or the ground. The object is to provide a buried object exploration device.

[Means for Solving the Problems]

An embedded object exploration apparatus to which the present invention is applied to solve the above problem will be described with reference to FIG. 1 corresponding to the embodiment. As shown in FIG. 1, the buried object exploration apparatus of the first invention of the present invention receives the reflected wave of the radio wave transmitted from the antenna 1 toward the structure or the ground at the antenna 1 and displays the reflected waveform. In a buried object exploration device having a circuit 7 and displaying the presence and position of an embedded object 9 inside a structure or ground while moving the antenna 1, a pair of transmitting antennas in which the antennas 1 are arranged adjacent to each other. A storage circuit 5 which is composed of a reception antenna and stores the reflected wave signal of the structure or the surface of the earth received by the antenna 1, the previous reflected wave signal input from the storage circuit 5, and the current from the antenna 1 after moving. It has a subtracting circuit 6 for calculating the difference from the reflected wave signal and a circuit 7 for displaying the waveform of the difference signal. The buried object exploration device of the second invention of the present invention is the same as the first invention.
As shown in the figure, the antenna 1 has a circuit 7 that receives a reflected wave of a radio wave transmitted from the antenna 1 toward the structure or the ground and displays the reflected waveform. In an embedded object exploration device for displaying the existence and position of an embedded object 9 inside the earth, the antenna 1 is composed of a pair of a transmitting antenna and a receiving antenna arranged adjacent to each other, and a structure or earth received by the antenna. Storage circuit 5 for storing a fixed signal simulating the reflected wave signal of the surface 8 of the, a subtraction circuit 6 for calculating the difference between the fixed signal input from the storage circuit 5 and the reflected wave signal from the antenna 1, and the difference signal It is characterized by having a circuit 7 for displaying the waveform of.

[Action]

In the buried object exploration apparatus of the first invention, the reflected wave signal 10 from the surface 8 of the structure or the ground is stored in the storage circuit 5, and the difference from the reflected wave signal 11 input with a time delay is subtracted. 6
And the waveform of the reflected wave signal 12 of the buried object 9 is displayed by the difference. In the buried object exploration device of the second invention, the fixed signal 10 simulating the reflected wave signal of the surface 8 of the structure or ground is stored in the memory circuit 5, and the fixed signal 10 and the reflection input from the antenna 1 are stored. The subtraction circuit 6 calculates the difference from the wave signal 11, and the waveform of the reflected wave signal 12 of the buried object 9 is displayed by the difference.

【Example】

Hereinafter, examples of the present invention will be described in detail. FIG. 1 is a block diagram of an embodiment of the buried object exploration apparatus to which the present invention is applied. In the figure, 1 is an antenna, 2 is a connection cable, and 3 is a main body display including a transmission / reception circuit 4, a storage circuit 5, a subtraction circuit 6 and a display circuit 7. It is assumed that the reinforcing bar 9 as an embedded object is buried in the shallow portion inside the concrete structure. 8 is the surface of the concrete structure. As shown in the figure, first, the antenna 1 is installed on a concrete surface where there is no embedded object inside. So antenna 1
When a radar wave is radiated from the surface, only the reflected wave from the concrete structure surface 8 is input from the transmission / reception circuit 4 to the storage circuit 5 and stored. That is, in this embodiment, the memory circuit 5
Is composed of a readable / writable memory circuit (RAM), and the reflected wave from the concrete structure surface 8 during exploration and measurement is stored. Reference numeral 10 is a reflection waveform at this time, that is, a reflection waveform generated on the surface 8. Next, the radar wave is radiated while moving the antenna 1 along the concrete structure surface 8 in the arrow direction. When the antenna 1 approaches the reinforcing bar 9 in time, both the reflected wave from the concrete structure surface 8 and the reflected wave from the reinforcing bar 9 are input from the transmission / reception circuit 4 to the subtraction circuit 6. Reference numeral 11 denotes a reflection waveform at this time, that is, a waveform in which the reflection occurring on the surface 8 and the reflection occurring on the reinforcing bar 9 overlap each other. On the other hand, according to the above, only the reflected wave from the concrete structure surface 8 is stored in the memory circuit 5, and the reflected wave is input to the subtraction circuit 6. The subtraction circuit 6 calculates the difference between the reflected wave 11 in which the reflected wave from the concrete structure surface 8 and the reflected wave from the reinforcing bar 9 are combined, and the reflected wave 10 from the concrete structure surface 8 only. Reference numeral 12 is the waveform of the difference, that is, the waveform of the reflection that occurs at the reinforcing bar 9. The reflected waveform 12 is displayed by the display circuit 7. Only the reflected wave from the reinforcing bar 9 is shown on the display body 3 so that the existence and position of the reinforcing bar 9 can be easily and accurately determined. Since the reflected wave generated on the concrete structure surface 8 has little difference due to the difference in concrete, it can be carried out by fixing the reflected waveform 10 and storing the memory circuit 5 in the ROM. By doing so,
It is possible to omit the operation of previously finding a portion of the concrete structure that is not affected by the buried object and storing the reflected waveform of only the surface.

【The invention's effect】

As described above, the buried object exploration apparatus of the present invention has a uniform property like concrete, and in a structure with a substantially flat surface, the reflected waves occurring on the surface are almost the same regardless of the location. By applying the above property, storing the reflected wave that occurs only on the surface and subtracting it from the measured waveform, the effect of the reflection that occurs on the surface can be almost eliminated. Display only the reflection waveform of the buried object without displaying the reflection on the surface of the structure or ground. Therefore, the exploration and measurement of the buried object at the shallow position can be performed accurately. Also, since the antenna used consists of a pair of transmitting antenna and receiving antenna, even if the buried objects are lined up at the same interval, the buried objects can be detected correctly,
The structure of the device is simple, lightweight and easy to handle.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an embedded object exploration apparatus to which the present invention is applied, and FIG. 2 is a block diagram of a conventional example. 1 ... antenna, 2 ... connection cable, 3 ... main body display, 4 ... transmission / reception circuit, 5 ... memory circuit, 6 ... arithmetic circuit, 7 ... display circuit, 8 ... structure surface, 9 …… Buried object, 10 …… Surface reflection waveform 11 …… Overlapping waveform of surface reflection and buried object reflection, 12…
... Waveform of buried object reflection

Claims (2)

[Claims] 1. A structure having a circuit for receiving a reflected wave of a radio wave transmitted from an antenna toward a structure or the ground and displaying the reflected waveform by the antenna, the circuit being inside the structure or the ground while moving the antenna. In an embedded object exploration device that displays the presence and position of an embedded object, the antenna is composed of a pair of a transmitting antenna and a receiving antenna arranged adjacent to each other, and a reflected wave signal received only by the structure or the surface of the ground. A storage circuit for storing the signal, a subtraction circuit for calculating the difference between the previous reflected wave signal input from the storage circuit and the current reflected wave signal from the antenna after the movement, and a circuit for displaying the waveform of the difference signal An embedded object exploration device comprising: 2. A circuit having a circuit for receiving a reflected wave of a radio wave transmitted from an antenna toward a structure or the ground and displaying the reflected waveform by the antenna, and being inside the structure or the ground while moving the antenna. In a buried object exploration device for displaying the existence and position of a buried object, the antenna is composed of a pair of a transmitting antenna and a receiving antenna arranged adjacent to each other, and a fixed signal simulating a reflected wave signal only on the surface of a structure or ground. A storage circuit for storing the following, a subtraction circuit for calculating a difference between a fixed signal input from the storage circuit and a reflected wave signal from the antenna,
And an embedded object exploration device having a circuit for displaying a waveform of a difference signal thereof.