JPH10260266A - Underground investigation radar - Google Patents
Underground investigation radarInfo
- Publication number
- JPH10260266A JPH10260266A JP9068120A JP6812097A JPH10260266A JP H10260266 A JPH10260266 A JP H10260266A JP 9068120 A JP9068120 A JP 9068120A JP 6812097 A JP6812097 A JP 6812097A JP H10260266 A JPH10260266 A JP H10260266A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- transmission
- underground
- probe
- radar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Geophysics And Detection Of Objects (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、地中に埋設され
た、埋設管等の被探査物の埋設位置を探査する地中探査
レーダーに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground exploration radar for exploring a buried position of an object such as a buried pipe buried underground.
【０００２】[0002]
【従来の技術】地中などに埋設される埋設管としては、
ガス管、上水道管、下水道管などが有る。これらの埋設
管は、後日、工事等のために埋設位置を調べられること
がある。このために、地中探査レーダーが使用される。
この地中探査レーダーは、送信アンテナから地中に向け
て送信信号（通常、高周波）が送波され、送波された送
信信号は地中の被探査物に当たって反射される。この反
射波は受信アンテナで受信され（以下、この反射波を
「受信波」という）、受信された信号は受表示記録装置
に表示記録される。2. Description of the Related Art As a buried pipe buried underground or the like,
There are gas pipes, water pipes, and sewer pipes. These buried pipes may be buried at a later date for construction or the like. For this purpose, underground exploration radar is used.
In the underground exploration radar, a transmission signal (usually a high frequency) is transmitted from a transmission antenna toward the underground, and the transmitted transmission signal is reflected by an underground object to be detected. This reflected wave is received by the receiving antenna (hereinafter, this reflected wave is referred to as “received wave”), and the received signal is displayed and recorded on the receiving / display recording device.
【０００３】作業者は、この表示記録を見ながら被探査
物の有無を判断し、さらに送信アンテナ及び受信アンテ
ナの位置を変更し、被探査物の探査を続ける。An operator judges the presence or absence of an object to be searched while looking at the display record, changes the positions of the transmitting antenna and the receiving antenna, and continues searching for the object to be searched.
【０００４】このような地中探査レーダーを用いると、
地面を掘り返さなくても、埋設管の埋設位置を探査する
ことができる。With such an underground exploration radar,
The burial position of the buried pipe can be searched without digging the ground.
【０００５】この方法の場合、外乱信号を除去するた
め、送信アンテナ及び受信アンテナを、内面に電磁吸収
体を張り付けた金属製のシールドケースで覆う方法が有
効である（特開昭６１−２９６２８７号公報）。In this method, in order to remove disturbance signals, it is effective to cover the transmitting antenna and the receiving antenna with a metal shield case having an electromagnetic absorber attached to the inner surface (Japanese Patent Laid-Open No. 61-296287). Gazette).
【０００６】[0006]
【発明が解決しようとする課題】しかし、このような地
中探査レーダーは、放射指向性が強いので、送信アンテ
ナからの送信波は、被探査物が送信面及び受信面と垂直
方向にあるときに最大の受信波となって受信される。従
って、通常の探査においては、受信波が最大になる送信
面及び受信面の方向と、被探査物の方向は一致しがたい
ものであった。However, since such an underground survey radar has a strong radiation directivity, a transmission wave from the transmission antenna is generated when the object to be detected is in a direction perpendicular to the transmission plane and the reception plane. Is received as the largest received wave. Therefore, in ordinary exploration, the directions of the transmitting surface and the receiving surface, at which the received wave is maximum, and the direction of the object to be searched are difficult to match.
【０００７】一方、探査する地面と送信面及び受信面に
密接していないと、地面と送信面及び受信面との間で大
幅に減衰する。従って、細い埋設管や、送信波の反射率
の小さい埋設管の場合には探査が不可能な場合もあっ
た。On the other hand, if the ground to be searched is not close to the transmitting surface and the receiving surface, there is a great deal of attenuation between the ground and the transmitting and receiving surfaces. Therefore, in the case of a thin buried pipe or a buried pipe having a small reflectance of a transmission wave, it may not be possible to search.
【０００８】本発明は上記の課題を解決し、細い埋設管
や、送信波の反射率の小さい埋設管のような従来の地中
探査レーダーでは探査困難な被探査物であっても、容易
に探査することができる地中探査レーダーを提供するこ
とを目的とする。The present invention solves the above-mentioned problems, and can easily detect an object to be detected that is difficult to detect with a conventional underground radar such as a thin buried pipe or a buried pipe having a small reflectance of a transmitted wave. It aims to provide an underground exploration radar that can be explored.
【０００９】[0009]
【課題を解決するための手段】請求項１記載（以下、
「本発明１という」）の地中探査レーダーは、地中に向
け、探査のための送信信号を送波する送信アンテナと、
反射波を受信する受信アンテナを有する地中探査レーダ
ーであって、送信アンテナ及び受信アンテナの送信面及
び受信面に、誘電物質が充填された探触子が設けられて
おり、この探触子は、その被探査物に向けられる面と、
送信アンテナ及び受信アンテナの送信面及び受信面とが
所定の角度を有するようになされているものである。Means for Solving the Problems According to claim 1,
The underground exploration radar according to “Invention 1”) transmits a transmission signal for exploration toward the ground,
An underground exploration radar having a receiving antenna for receiving a reflected wave, wherein a transmitting antenna and a transmitting surface and a receiving surface of the receiving antenna are provided with a probe filled with a dielectric substance, and the probe is , The surface facing the object,
The transmission surface and the reception surface of the transmission antenna and the reception antenna have a predetermined angle.
【００１０】本発明１において使用される誘電物質は、
送信信号を伝達し、探触子と、被探査物が埋設されてい
る地面との界面において送信信号の大半を反射しないも
のであれば特に限定されない。The dielectric material used in the present invention 1 is:
The transmission signal is not particularly limited as long as it transmits the transmission signal and does not reflect most of the transmission signal at the interface between the probe and the ground where the object to be searched is embedded.
【００１１】上記誘電物質は、探査の際に取り扱いを容
易にするため、プラスチック製の容器等に充填されて、
送信アンテナ及び受信アンテナにそれぞれ設けられる。The above-mentioned dielectric material is filled in a plastic container or the like in order to facilitate handling at the time of exploration.
The transmitting antenna and the receiving antenna are provided respectively.
【００１２】本発明１において、送信面、受信面とは、
それぞれ、上記送信アンテナ及び受信アンテナが最大の
指向性を持つ方向に対して垂直な面をいう。In the first aspect of the present invention, the transmitting surface and the receiving surface are
Each of these planes is perpendicular to the direction in which the transmitting antenna and the receiving antenna have the maximum directivity.
【００１３】本発明において送信アンテナ及び受信アン
テナは、必要に応じて内面に電磁吸収体を張り付けた金
属製のシールドケースで覆われていてもよい。上記電磁
吸収体としては例えば、フェライト系の電磁吸収体が使
用される。In the present invention, the transmitting antenna and the receiving antenna may be covered by a metal shield case having an electromagnetic absorber attached to the inner surface as necessary. For example, a ferrite-based electromagnetic absorber is used as the electromagnetic absorber.
【００１４】本発明において地中とは、土壌であっても
よいし、アスファルト、コンクリート等人工的に構築さ
れたものであってもよい。In the present invention, the underground may be soil or artificially constructed asphalt, concrete, or the like.
【００１５】請求項２記載（以下、「本発明２とい
う」）の地中探査レーダーは、本発明１の地中探査レー
ダーにおいて、上記誘電物質の誘電率が、被探査物が埋
設されている地面と略等しくなされているものである。The underground survey radar according to claim 2 (hereinafter referred to as “the present invention 2”) is the underground survey radar according to the present invention 1 in which the dielectric substance has a dielectric constant and an object to be searched is buried. It is almost equal to the ground.
【００１６】本発明２において使用される誘電物質は、
その誘電率が、被探査物が埋設されている地面と略等し
くなされていれば特に限定されないが、小さすぎても、
大きすぎても、誘電物質が充填された探触子と、被探査
物が埋設されている地面との界面における反射波が大き
くなり、被探査物からの受信波が小さくなるので比誘電
率として２〜３０が好ましい。The dielectric material used in the present invention 2 is:
The dielectric constant is not particularly limited as long as it is made substantially equal to the ground on which the object to be buried is buried.
Even if it is too large, the reflected wave at the interface between the probe filled with the dielectric substance and the ground where the object is buried becomes large, and the received wave from the object becomes small, so the relative permittivity is 2 to 30 are preferred.
【００１７】この場合、通常被探査物が埋設されている
地面の比誘電率は２〜３０であるので、上記誘電物質と
しては、たとえばＳｉＯ2 （比誘電率４）、ＣａＣＯ3
（比誘電率８）などがあげられる。これらは単独で使用
されてもよいし、２種類以上併用されてもよい。又、さ
らに必要に応じて、上記誘電物質に、ＴｉＯ2 （比誘電
率８０）、Ｈ2 Ｏ（比誘電率５５〜８７）などを混合
し、探査物が埋設されている地面の誘電率と略等しくし
たものであってもよい。さらに、被探査物が埋設されて
いる地面の土壌を、直接探触子に充填してもよい。In this case, since the relative permittivity of the ground in which the object to be searched is usually buried is 2 to 30, the above-mentioned dielectric materials include, for example, SiO 2 (relative permittivity 4), CaCO 3
(Relative dielectric constant 8). These may be used alone or in combination of two or more. Further, if necessary, TiO 2 (relative dielectric constant of 80), H 2 O (relative dielectric constant of 55 to 87), or the like is mixed with the above-mentioned dielectric substance, and the dielectric constant of the ground where the exploration object is embedded is reduced. It may be substantially equal. Furthermore, the probe may be directly filled with soil on the ground where the object to be searched is embedded.
【００１８】なお、反射波の強度は、誘電物質と被探査
物が埋設されている地面との比の１／２乗に比例するの
で、誘電物質の誘電率は、地面とオーダーとして略等し
ければよい。Since the intensity of the reflected wave is proportional to the half power of the ratio between the dielectric substance and the ground on which the object is buried, if the dielectric constant of the dielectric substance is approximately equal to that of the ground. Good.
【００１９】本発明２において、必要に応じて、予め被
探査物が埋設されている地面の（比）誘電率を測定して
おき、その（比）誘電率に略等しい（比）誘電率を有す
る誘電物質を使用してもよい。この場合誘電物質が充填
された探触子は、送信アンテナ及び受信アンテナと着脱
自在にされているとよい。In the second aspect of the present invention, the (relative) dielectric constant of the ground in which the object to be searched is buried is measured in advance as necessary, and the (relative) dielectric constant substantially equal to the (relative) dielectric constant is measured. A dielectric material having the same may be used. In this case, the probe filled with the dielectric material may be detachably attached to the transmitting antenna and the receiving antenna.
【００２０】本発明２において、探触子に充填される誘
電物質は、全体に一定の誘電率を有するものであっても
よいが、地面及び被探査物に向け、誘電率が徐々に増加
又は減少する構成とされていてもよい。誘電率が徐々に
増加又は減少し、地面との境界面で、地面と略等しくさ
れていればよい。In the second aspect of the present invention, the dielectric material filled in the probe may have a constant dielectric constant as a whole, but the dielectric constant gradually increases or decreases toward the ground and the object to be inspected. It may be configured to decrease. It suffices that the permittivity gradually increases or decreases and is substantially equal to the ground at the boundary surface with the ground.
【００２１】請求項３記載（以下、「本発明３とい
う」）の地中探査レーダーは、本発明１又は２の地中探
査レーダーにおいて、探触子が被探査物に向けられる面
と、送信アンテナ及び受信アンテナの送信面及び受信面
との成す角度θと、被探査物の埋設深さＤと、探触子間
距離Ｌとの関係が、略θ＝ａｒｃｔａｎ（Ｌ／２Ｄ）と
されているものである。The underground survey radar according to claim 3 (hereinafter referred to as “the present invention 3”) is the underground survey radar according to the first or second aspect of the present invention, wherein the surface on which the probe is directed toward the object to be searched and The relationship between the angle θ between the transmitting surface and the receiving surface of the antenna and the receiving antenna, the buried depth D of the object to be searched, and the distance L between the probes is approximately θ = arctan (L / 2D). Is what it is.
【００２２】本発明３に使用される探触子は、例えば探
触子が被探査物に向けられる面と、送信アンテナ及び受
信アンテナの送信面及び受信面に設けられる面との角度
が、上記の如くなされた三角錐又は三角柱のプラスチッ
ク製容器に、前記誘電物質を充填して送信面及び受信面
に設けられるとよい。In the probe used in the present invention 3, for example, the angle between the surface on which the probe is aimed at the object to be detected and the surfaces provided on the transmission surface and the reception surface of the transmission antenna and the reception antenna is set to the above-mentioned angle. It is preferable that the dielectric material is filled in a triangular pyramid or triangular prism plastic container formed as described above and provided on the transmitting surface and the receiving surface.
【００２３】通常、被探査物が埋設管の場合、埋設深さ
はおおよそ決まっている（例えば建物配管の場合数十ｃ
ｍ）ので、その深さＤと、θ、Ｌとの関係を略θ＝ａｒ
ｃｔａｎ（Ｌ／２Ｄ）となるようにするとよい。この場
合、例えばθが一定の探触子を使用し、上式を満たすよ
うに探触子間距離Ｌを設定してもよいし、探触子間距離
Ｌが一定とされた地中探査レーダーを使用する場合に
は、上式を満たすようなθを有する探触子を選定すれば
よい。Normally, when the object to be detected is a buried pipe, the burial depth is roughly determined (for example, in the case of a building pipe, several tens c.
m), the relationship between the depth D and θ, L is approximately θ = ar
ctan (L / 2D). In this case, for example, a probe having a constant θ may be used, and the inter-probe distance L may be set so as to satisfy the above equation, or an underground survey radar in which the inter-probe distance L is fixed Is used, a probe having θ satisfying the above equation may be selected.
【００２４】（作用）本発明１の地中探査レーダーは、
地中に向け、探査のための送信信号を送波する送信アン
テナと、反射波を受信する受信アンテナを有する地中探
査レーダーであって、送信アンテナ及び受信アンテナの
送信面及び受信面に、誘電物質が充填された探触子が設
けられており、この探触子は、その被探査物に向けられ
る面と、送信アンテナ及び受信アンテナの送信面及び受
信面とが所定の角度を有するようになされているもので
あるから、探触子と、被探査物が埋設されている地面と
の間が密接でき、この界面からの反射波を小さくできる
とともに、探触子が地面と接触する面の角度を適宜調整
することにより、送信アンテナと受信アンテナが最大の
指向性を持つ方向を被探査物に向けることができ、被探
査物からの受信波を最大にすることができる。(Operation) The underground survey radar of the present invention 1
An underground exploration radar having a transmitting antenna for transmitting a transmission signal for exploration toward the ground and a receiving antenna for receiving a reflected wave, wherein a transmitting antenna and a receiving antenna have a dielectric surface on a transmitting surface and a receiving surface. A probe filled with a substance is provided, and the probe is configured such that a surface directed to the object to be detected and a transmission surface and a reception surface of the transmission antenna and the reception antenna have a predetermined angle. Therefore, the probe and the ground where the object is buried can be in close contact, the reflected wave from this interface can be reduced, and the surface of the surface where the probe contacts the ground can be reduced. By appropriately adjusting the angle, the direction in which the transmitting antenna and the receiving antenna have the maximum directivity can be directed to the object to be searched, and the received wave from the object to be searched can be maximized.
【００２５】本発明２の地中探査レーダーは、本発明１
の地中探査レーダーにおいて、上記誘電物質の誘電率
が、被探査物が埋設されている地面と略等しくなされて
いるものであるから、探触子と、被探査物が埋設されて
いる地面との界面からの反射波をさらに小さくできる。The underground exploration radar of the second aspect of the present invention is the same as that of the first aspect.
In the underground survey radar, the dielectric constant of the dielectric substance is set to be substantially equal to the ground on which the object is buried, so that the probe and the ground on which the object is buried The reflected wave from the interface can be further reduced.
【００２６】本発明３の地中探査レーダーは、本発明１
又は２の地中探査レーダーにおいて、探触子が被探査物
に向けられる面と、送信アンテナ及び受信アンテナの送
信面及び受信面との成す角度θと、被探査物の埋設深さ
Ｄと、探触子間距離Ｌとの関係が、略θ＝ａｒｃｔａｎ
（Ｌ／２Ｄ）とされているものであるから、送信アンテ
ナと受信アンテナが最大の指向性を持つ方向を被探査物
に向けることができ、効率的に送信波を送ることがで
き、被探査物からの受信波を最大にすることができる。The underground survey radar according to the third aspect of the present invention is the same as the first aspect of the invention.
Or 2 in the underground survey radar, the angle θ between the surface where the probe is directed toward the object to be searched, the transmitting surface and the receiving surface of the transmitting antenna and the receiving antenna, and the burying depth D of the object to be searched, The relationship with the inter-probe distance L is approximately θ = arctan
(L / 2D), the transmitting antenna and the receiving antenna can direct the direction having the maximum directivity to the object to be searched, and the transmission wave can be transmitted efficiently, The reception wave from the object can be maximized.
【００２７】[0027]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照しつつ説明する。図１は、本発明１〜３の地中探
査レーダーを示す説明図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the underground survey radars of the present inventions 1 to 3.
【００２８】図１において、１は送信アンテナ、２は送
信器、３は受信アンテナ、４は受信器、５は信号処理装
置、６は表示記録装置、７は制御装置、８は探触子、Ｐ
は被探査物である。In FIG. 1, 1 is a transmitting antenna, 2 is a transmitter, 3 is a receiving antenna, 4 is a receiver, 5 is a signal processing device, 6 is a display recording device, 7 is a control device, 8 is a probe, P
Is the object to be probed.
【００２９】図１に示すように、地中探査レーダーに
は、地中に向け、探査のための送信信号を送波する送信
アンテナ１と、反射波を受信する受信アンテナ３を有
し、送信アンテナ１及び受信アンテナ３の送信面及び受
信面に、誘電物質が充填された探触子８、８が設けられ
ている。As shown in FIG. 1, the underground exploration radar has a transmission antenna 1 for transmitting a transmission signal for exploration toward the ground and a reception antenna 3 for receiving a reflected wave. Probes 8, 8 filled with a dielectric substance are provided on the transmitting surface and the receiving surface of the antenna 1 and the receiving antenna 3.
【００３０】探触子８、８は、三角錐状のプラスチック
容器に誘電物質（ＳｉＯ2 ）が充填され、被探査物の埋
設深さＤ＝３０ｃｍ、探触子が被探査物に向けられる面
と、送信アンテナ１及び受信アンテナ３の送信面及び受
信面との成す角度θ＝３３°、探触子間距離Ｌ＝４０ｃ
ｍとされており、略θ＝ａｒｃｔａｎ（Ｌ／２Ｄ）の関
係を満たしている。The probes 8, 8 are filled with a dielectric substance (SiO 2 ) in a triangular pyramid-shaped plastic container, and the buried depth D of the object to be detected is 30 cm, and the surface on which the probe is directed toward the object to be detected. Θ between the transmission surface and the reception surface of the transmission antenna 1 and the transmission surface and the reception surface of the reception antenna 3 are 33 °, and the distance L between the probes is 40c.
m, which substantially satisfies the relationship of θ = arctan (L / 2D).
【００３１】制御装置７により制御された信号が送信器
２を経て送信アンテナ１に送られ、この送信アンテナ１
から地中に向けて送信信号（高周波）が送波される。The signal controlled by the control device 7 is sent to the transmitting antenna 1 via the transmitter 2, and the transmitting antenna 1
, A transmission signal (high frequency) is transmitted toward the ground.
【００３２】送波された送信信号は地中の被探査物Ｐに
当たって反射され、この反射波は受信波として、受信ア
ンテナ３で受信される。受信された信号は受信器４を経
て、信号処理装置５で増幅、変調され、表示記録装置６
で表示記録される。The transmitted transmission signal strikes the object P under the ground and is reflected. The reflected wave is received by the reception antenna 3 as a reception wave. The received signal passes through a receiver 4 and is amplified and modulated by a signal processing device 5, and a display recording device 6
Is displayed and recorded.
【００３３】作業者は、この表示記録を見ながら被探査
物Ｐの有無を判断し、さらに送信アンテナ１及び受信ア
ンテナ３の位置を変更し、被探査物Ｐの探査を続ける。The operator judges the presence or absence of the object P while looking at the display record, further changes the positions of the transmitting antenna 1 and the receiving antenna 3, and continues to search the object P.
【００３４】[0034]
【発明の効果】本発明１の地中探査レーダーは、上述の
ような構成とされているので、探触子と、被探査物が埋
設されている地面との間の界面からの反射波を小さくで
きるとともに、被探査物からの受信波を最大にすること
ができるため、細い埋設管や、送信波の反射率の小さい
埋設管のような従来の地中探査レーダーでは探査困難な
被探査物であっても、容易に探査することができる。The underground exploration radar according to the first aspect of the present invention has the above-mentioned configuration, and therefore, reflects the reflected wave from the interface between the probe and the ground on which the object to be searched is embedded. Because it is possible to reduce the size of the object and to maximize the wave received from the object, it is difficult to detect the object using conventional underground radar such as a thin buried pipe or a buried pipe with a small reflectance of the transmitted wave. However, it can be easily searched.
【００３５】本発明２の地中探査レーダーは、上述のよ
うな構成とされているので、探触子と、被探査物が埋設
されている地面との界面からの反射波をさらに小さくで
きるため、細い埋設管や、送信波の反射率の小さい埋設
管のような従来の地中探査レーダーでは探査困難な被探
査物であっても、容易に探査することができる。The underground survey radar according to the second aspect of the present invention is configured as described above, so that the reflected wave from the interface between the probe and the ground in which the object to be searched is buried can be further reduced. It is possible to easily search even an object to be searched which is difficult to search with a conventional underground search radar such as a thin buried pipe or a buried pipe having a small reflectance of a transmission wave.
【００３６】本発明３の地中探査レーダーは、上述のよ
うな構成とされているので、被探査物からの受信波を最
大にすることができるため、細い埋設管や、送信波の反
射率の小さい埋設管のような従来の地中探査レーダーで
は探査困難な被探査物であっても、容易に探査すること
ができる。The underground survey radar according to the third aspect of the present invention is configured as described above, and can maximize the reception wave from the object to be detected. A conventional underground radar, such as a small buried pipe, can easily detect even an object that is difficult to search.
【図１】本発明１〜３の地中探査レーダーを示す説明図
である。FIG. 1 is an explanatory view showing an underground exploration radar of the present inventions 1 to 3.
１ 送信アンテナ ３ 受信アンテナ ８ 探触子、 Ｐ 被探査物 1 Transmitting antenna 3 Receiving antenna 8 Probe, P Object to be detected
Claims (3)
波する送信アンテナと、反射波を受信する受信アンテナ
とを有する地中探査レーダーであって、送信アンテナ及
び受信アンテナの送信面及び受信面に、誘電物質が充填
された探触子が設けられており、この探触子は、その被
探査物に向けられる面と、送信アンテナ及び受信アンテ
ナの送信面及び受信面とが所定の角度を有するようにな
されていることを特徴とする地中探査レーダー。1. An underground exploration radar having a transmission antenna for transmitting a transmission signal for exploration toward the ground and a reception antenna for receiving a reflected wave, wherein a transmission surface of the transmission antenna and the reception antenna is provided. A probe filled with a dielectric substance is provided on the receiving surface, and the probe has a surface facing the object to be detected, and a transmitting surface and a receiving surface of the transmitting antenna and the receiving antenna are predetermined. Underground exploration radar characterized by having an angle of.
設されている地面と略等しくなされていることを特徴と
する請求項１記載の地中探査レーダー。2. The underground survey radar according to claim 1, wherein the permittivity of the dielectric material is set substantially equal to the ground on which the object to be searched is buried.
と、送信アンテナ及び受信アンテナの送信面及び受信面
との成す角度θと、被探査物の埋設深さＤと、探触子間
距離Ｌとの関係が、略θ＝ａｒｃｔａｎ（Ｌ／２Ｄ）と
されていることを特徴とする請求項１又は２記載の地中
探査レーダー。3. An angle θ formed between a surface on which the probe is directed toward the object to be detected, a transmission surface and a reception surface of a transmitting antenna and a receiving antenna, a burying depth D of the object to be detected, and a probe. The underground survey radar according to claim 1, wherein a relationship with the distance L is substantially θ = arctan (L / 2D). 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9068120A JPH10260266A (en) | 1997-03-21 | 1997-03-21 | Underground investigation radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9068120A JPH10260266A (en) | 1997-03-21 | 1997-03-21 | Underground investigation radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10260266A true JPH10260266A (en) | 1998-09-29 |
Family
ID=13364577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9068120A Pending JPH10260266A (en) | 1997-03-21 | 1997-03-21 | Underground investigation radar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10260266A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239788A (en) * | 2018-11-14 | 2019-01-18 | 广州瑾诚测绘有限公司 | A kind of detection method and device of pipe diameter of underground non-metal pipe |
-
1997
- 1997-03-21 JP JP9068120A patent/JPH10260266A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239788A (en) * | 2018-11-14 | 2019-01-18 | 广州瑾诚测绘有限公司 | A kind of detection method and device of pipe diameter of underground non-metal pipe |
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