JPS59793B2 - Buried object detection device with rotating antenna - Google Patents
Buried object detection device with rotating antennaInfo
- Publication number
- JPS59793B2 JPS59793B2 JP55104353A JP10435380A JPS59793B2 JP S59793 B2 JPS59793 B2 JP S59793B2 JP 55104353 A JP55104353 A JP 55104353A JP 10435380 A JP10435380 A JP 10435380A JP S59793 B2 JPS59793 B2 JP S59793B2
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- JP
- Japan
- Prior art keywords
- antenna
- buried object
- signal
- container
- circuit
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- Expired
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Radar Systems Or Details Thereof (AREA)
Description
【発明の詳細な説明】
この発明は、回転するアンテナを持つ埋設物探知装置に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a buried object detection device having a rotating antenna.
従来この種の装置として第１図に示すものがあった。A conventional device of this type is shown in FIG.
図において、１は発振器、２は送信アンテナ、３と９は
受信アンテナ、４と１０は互いに逆極性をもつ検波器、
５は指示計、６は異質物体または埋設物、７は均質物体
、８は上記送信アンテナ２と受信アンテナ３と９を収納
固定する容器、１１は差動比較器である。In the figure, 1 is an oscillator, 2 is a transmitting antenna, 3 and 9 are receiving antennas, 4 and 10 are detectors with opposite polarities,
5 is an indicator, 6 is a foreign object or a buried object, 7 is a homogeneous object, 8 is a container for storing and fixing the transmitting antenna 2 and receiving antennas 3 and 9, and 11 is a differential comparator.
次に上記従来装置の作用について説明する。Next, the operation of the above conventional device will be explained.
発振器１で発振された電波は送信アンテナ２から送信さ
れ、受信アンテナ３と９で受信される。Radio waves generated by an oscillator 1 are transmitted from a transmitting antenna 2 and received by receiving antennas 3 and 9.
受信アンテナ３と９で受信される電波は埋設物６がなけ
れば均質物体７から反射した電波と送信アンテナ２から
直接受信される電波である。The radio waves received by the receiving antennas 3 and 9 are the radio waves reflected from the homogeneous object 7 and the radio waves directly received from the transmitting antenna 2 if there is no buried object 6.
このとき、受信アンテナ３と９の電波の強さは各々等し
く距離りが変化した場合でも同時に同量で変化する。At this time, the intensities of the radio waves of the receiving antennas 3 and 9 change by the same amount at the same time even if the distance changes equally.
受信アンテナ３と９で受信された電波は互いに逆極性を
もつ検波器４と１０で極性が異なり大きさが同じ直流信
号に変換され、これら二つの信号は差動比較器１１へ加
えられ、その出力は埋設物６がなければ常に０となる。Radio waves received by receiving antennas 3 and 9 are converted into DC signals with different polarities and the same magnitude by detectors 4 and 10, which have opposite polarities, and these two signals are added to a differential comparator 11, which The output will always be 0 if there is no buried object 6.
次いで容器８を矢印■の方向へ動かすとき、埋設物６が
あると、受信アンテナ３が影響をうけて今まで平衡状態
であった指示計５に変化が生じる。Next, when the container 8 is moved in the direction of the arrow (2), if there is a buried object 6, the reception antenna 3 is affected and the indicator 5, which has been in an equilibrium state, changes.
さらに、受信アンテナ２が埋設物６の付近にあると受信
アンテナ３と９は再び平衡状態となって指示計５はＯと
なる。Further, when the receiving antenna 2 is near the buried object 6, the receiving antennas 3 and 9 are again in an equilibrium state, and the indicator 5 becomes O.
さらにまた埋設物６が受信アンテナ９に近ずくところで
は不平衡となって指示計５に変化を生じる。Furthermore, where the buried object 6 approaches the receiving antenna 9, it becomes unbalanced, causing a change in the indicator 5.
よって指示計５の変化から埋設物６の存在を知ることが
できる。Therefore, the presence of the buried object 6 can be known from the change in the indicator 5.
上記従来の埋設物の探知装置は以上のように構成されて
いるので容器８と均質物体７の距離りが変化した場合で
も埋設物６が存在しなければ指示計５はＯを指示するが
、容器８と均質物体７が平行でなくなると、送信アンテ
ナ２から発射し均質物体７で反射して受信アンテナ３と
９に達する電波の伝搬長が異なってくるため電波の強さ
に差が生じて不平衡となり埋設物６が存在しないにもか
かわらず指示計５に変化を生じこれがあたかも埋設物６
の存在を示すものと誤認することになる。The conventional buried object detection device described above is configured as described above, so even if the distance between the container 8 and the homogeneous object 7 changes, if the buried object 6 is not present, the indicator 5 will indicate O. When the container 8 and the homogeneous object 7 are no longer parallel, the propagation length of the radio waves emitted from the transmitting antenna 2, reflected by the homogeneous object 7, and reaching the receiving antennas 3 and 9 becomes different, resulting in a difference in the strength of the radio waves. Due to the imbalance, the indicator 5 changes even though there is no buried object 6, which makes it appear as if there is a buried object 6.
This could be mistaken as indicating the existence of
従って、容器８は均質物体７と常に平行に保ちながら移
動しなければ効果が得られない欠点があった。Therefore, there is a drawback that the effect cannot be obtained unless the container 8 is moved while always being kept parallel to the homogeneous object 7.
また、多数個のアンテナによって送信系の両側に受信系
を対称位置に配し、この各々から得た信号の検波極性を
互いに逆極性にしただけでは、多数個のアンテナ間で相
互干渉をおこし上記の目的を達成することが困難である
などの欠点があった。Furthermore, if the receiving system is arranged symmetrically on both sides of the transmitting system using a large number of antennas, and the detection polarities of the signals obtained from each of these systems are made to be opposite to each other, mutual interference will occur between the large number of antennas. There were disadvantages such as difficulty in achieving the objectives.
この発明は、上記のような従来装置における欠点を除去
するためになされたもので、少なくとも発振器からなる
信号発生部と、該信号発生部からの信号を送信せしめる
１個の送信アンテナと上記１個の送信アンテナと組をな
した１個の受信アンテナからなるアンテナ部と、上記ア
ンテナ部を回転せしめるアンテナ回転駆動装置からなる
アンテナ回転駆動部と、上記受信アンテナの受信した信
号を検波・増幅する回路と直流分を阻止する回路と上記
アンテナ回転駆動装置によって回転せしめられる上記ア
ンテナ部の回転周期の２倍に相当する周波数成分のみを
阻止する帯域阻止濾波回路からなる信号処理部と、指示
計と受話器のなかの少なくともひとつからなる表示部と
を具備させ、上記アンテナ部を収納固定する容器が被探
知面に対して平行でなくなった場合に生じる信号分を除
去する構成とすることにより、埋設物のみの信号分が検
知できる回転するアンテナを持つ埋設物探知装置を提供
することを目的としている。The present invention was made in order to eliminate the drawbacks of the conventional device as described above, and includes a signal generating section consisting of at least an oscillator, one transmitting antenna for transmitting a signal from the signal generating section, and the above-mentioned one transmitting antenna. an antenna section consisting of one receiving antenna paired with a transmitting antenna; an antenna rotation drive section consisting of an antenna rotation drive device for rotating the antenna section; and a circuit for detecting and amplifying the signal received by the receiving antenna. a signal processing section comprising a circuit for blocking a direct current component, a band rejection filter circuit for blocking only a frequency component corresponding to twice the rotation period of the antenna section rotated by the antenna rotation drive device, an indicator, and a receiver. A display section consisting of at least one of The object of the present invention is to provide a buried object detection device having a rotating antenna that can detect signals of .
以下、この発明の一実施例を図について説明する。An embodiment of the present invention will be described below with reference to the drawings.
第２図において、ａは信号発生部、ｂはアンテナ部−、
Ｃはアンテナ回転駆動部、ｄは信号処理部、ｅは表示部
、２０は発振器、２１は減衰器、２２ａｌｔｉ送信アン
テナ、２２ｂは受信アンテナ、２３はアンテナ回転１駆
動装置、２４は検波・増幅回路、２５は直流分阻止回路
、２６は帯域阻止濾波回路、２７ａは指示計変換回路、
２７ｂは指示計、２８ａは音響変換回路、２８ｂは受話
器である。In FIG. 2, a is a signal generating section, b is an antenna section,
C is an antenna rotation drive unit, d is a signal processing unit, e is a display unit, 20 is an oscillator, 21 is an attenuator, 22 is an alti transmitting antenna, 22b is a receiving antenna, 23 is an antenna rotation 1 drive unit, 24 is a detection/amplification circuit , 25 is a DC component blocking circuit, 26 is a band rejection filter circuit, 27a is an indicator conversion circuit,
27b is an indicator, 28a is an acoustic conversion circuit, and 28b is a receiver.
次に上記実施例の作用について説明する。Next, the operation of the above embodiment will be explained.
発振器２０で発振された電波は減衰器２１で減衰される
か、または減衰器２１をつけないで無減衰のままで送信
アンテナ２２ａへ送られる。The radio waves oscillated by the oscillator 20 are attenuated by the attenuator 21, or are sent to the transmitting antenna 22a without being attenuated without the attenuator 21 attached.
送信アンテナ２２ａから送られた電波は受信アンテナ２
２ｂで受信され、検波・増幅回路２４へ送られる。The radio waves sent from the transmitting antenna 22a are sent to the receiving antenna 2.
2b and sent to the detection/amplification circuit 24.
受信アンテナ２２ｂで受信された電波は検波・増幅回路
２４において直流分と交流分の合成された信号または直
流分のみの信号に変換され、増幅されて直流分阻止回路
２５へ送られる。The radio wave received by the receiving antenna 22b is converted by the detection/amplification circuit 24 into a combined signal of DC and AC components or a signal of only the DC component, amplified, and sent to the DC component blocking circuit 25.
上記検波・増幅回路２４から送られた信号は直流分阻止
回路２５において直流分のみが阻止され、即ち、交流分
のみの信号となって帯域阻止濾波回路２６へ送られる。The DC component of the signal sent from the detection/amplification circuit 24 is blocked by the DC component blocking circuit 25, that is, the signal becomes only the AC component and is sent to the band rejection filter circuit 26.
帯域阻止濾波回路２６はアンテナ回転駆動装置２３によ
って回転せしめられるアンテナ部すを収納固定する容器
Ａの１回転について２倍に相当する周波数成分のみを阻
止するように作用する。The band-elimination filter circuit 26 acts to block only the frequency component corresponding to twice the frequency per one revolution of the container A that houses and fixes the antenna part rotated by the antenna rotation driving device 23.
従って、直流分阻止回路２５からの交流分のみの信号の
うち、容器Ａの回転に起因する周波数成分のみが帯域阻
止濾波回路２６において阻止され、表示部ｅへ送られる
。Therefore, of the only AC signal from the DC component blocking circuit 25, only the frequency component resulting from the rotation of the container A is blocked by the band rejection filter circuit 26 and sent to the display section e.
ここで、送信アンテナ２２ａと受信アンテナ２２ｂで構
成されるアンテナ部すとアンテナ回転駆動装置２３から
なるアンテナ回転駆動部Ｃの作用について説明する。Here, the operation of the antenna section C, which is composed of the transmitting antenna 22a and the receiving antenna 22b, and the antenna rotation drive section C, which is composed of the antenna rotation drive device 23, will be explained.
第３図は送信アンテナ２２ａと受信アンテナ２２ｂの配
置を示す平面図である。FIG. 3 is a plan view showing the arrangement of the transmitting antenna 22a and the receiving antenna 22b.
第３図において、送信アンテナ２２ａと受信アンテナ２
２ｂで構成されるアンテナ部すを収納固定する容器Ａは
送信アンテナ２２ａと受信アンテナ２２ｂの中間点３０
を中心にして矢印Ｗの方向へアンテナ回転駆動装置２３
によって回転せしめられる。In FIG. 3, the transmitting antenna 22a and the receiving antenna 2
The container A that stores and fixes the antenna part 2b is located at the midpoint 30 between the transmitting antenna 22a and the receiving antenna 22b.
Antenna rotation drive device 23 in the direction of arrow W centering on
It is rotated by
第４図は送信アンテナ２２ａと受信アンテナ２２ｂで構
成されるアンテナ部すを収納固定する容器Ａが回転を停
止して被探知面としての地面４０に対して平行にある場
合を示している。FIG. 4 shows a case where the container A, which houses and fixes the antenna part composed of the transmitting antenna 22a and the receiving antenna 22b, has stopped rotating and is parallel to the ground 40 as the surface to be detected.
この場合、容器Ａがアンテナ回転駆動装置２３によって
矢印Ｗの方向へ水平に回転せしめられると送信アンテナ
２２ａと受信アンテナ２２ｂの位置は交互に入れかわる
。In this case, when the container A is horizontally rotated in the direction of the arrow W by the antenna rotation drive device 23, the positions of the transmitting antenna 22a and the receiving antenna 22b alternate.
つぎに、埋設物を探知する場合を第４図と第５図によっ
て説明する。Next, the case of detecting a buried object will be explained with reference to FIGS. 4 and 5.
第４図において、容器Ａは地面４０と距離り。In FIG. 4, container A is at a distance from the ground 40.
を離れて平行に位置しているためアンテナ回転駆動装置
２３によって容器Ａが矢印Ｗの方向へ回転せしめられて
も、送信アンテナ２２ａ→地面４０→受信アンテナ２２
ｂへと伝搬される電波の強さは変化を生じない。Because they are located apart and parallel to each other, even if the container A is rotated in the direction of arrow W by the antenna rotation drive device 23, the transmitting antenna 22a→ground 40→receiving antenna 22
The strength of the radio waves propagated to b does not change.
従って、検波・増幅回路２４から出力せしめられる信号
は直流分のみとなる。Therefore, the signal outputted from the detection/amplification circuit 24 is only the DC component.
即ち、検波・増幅回路２４の出力信号は第５図に示す６
０ａのようになる。That is, the output signal of the detection/amplification circuit 24 is 6 as shown in FIG.
It becomes like 0a.
つぎに、容器ＡがＸ方向へ移動して、送信アンテナ２２
ａまたは受信アンテナ２２ｂが埋設物５０の上付近にく
ると容器Ａがアンテナ回転駆動装置２３によって駆動せ
しめられているので、送信アンテナ２２ａ→地面４０→
受信アンテナ２２ｂへと伝搬される電波の強さは埋設物
５０の影響をうけて容器Ａの半回転ごとに変化が生じる
。Next, the container A moves in the X direction, and the transmitting antenna 22
When the receiving antenna a or the receiving antenna 22b comes near the top of the buried object 50, since the container A is being driven by the antenna rotation drive device 23, the transmitting antenna 22a → the ground 40 →
The strength of the radio waves propagated to the receiving antenna 22b changes every half rotation of the container A due to the influence of the buried object 50.
従って検波・増幅回路２４から出力せしめられる信号に
は交流会を含み第５図の６１ａ、６ｉｂのような信号と
なる。Therefore, the signals outputted from the detection/amplification circuit 24 include the exchange meeting and become signals such as 61a and 6ib in FIG.
即ち、６１ａは容器Ａの回転中において埋設物５０の影
響をうけない信号であり、６１ａは埋設物５０の影響を
うけて容器Ａの半回転ごとに生じる信号である。That is, 61a is a signal that is not affected by the buried object 50 while the container A is rotating, and 61a is a signal that is generated every half rotation of the container A due to the influence of the buried object 50.
さらに、容器ＡがＸ方向へ移動して送信アンテナ２２ａ
と受信アンテナ２２ｂの中間点３０が埋設物５０の上付
近にくると、送信アンテナ２２ａから発射された電波は
地面４０と埋設物５０から反射して受信アンテナ２２ｂ
に達するので、受信アンテナ２２ｂで受信される電波の
強さは、埋設物５０のない場合に比べて強くなる。Furthermore, the container A moves in the X direction and the transmitting antenna 22a
When the intermediate point 30 of the receiving antenna 22b comes close to the top of the buried object 50, the radio waves emitted from the transmitting antenna 22a are reflected from the ground 40 and the buried object 50 and reach the receiving antenna 22b.
Therefore, the strength of the radio waves received by the receiving antenna 22b is stronger than in the case where there is no buried object 50.
ところが、埋設物５０が送信アンテナ２２ａと受信アン
テナ２２ｂの中間点３０の位置にあるので、受信アンテ
ナ２２ｂで受信される電波の強さは、容器Ａが回転して
いても埋設物５０の影響が同じであるため変化を生じな
い。However, since the buried object 50 is located at the midpoint 30 between the transmitting antenna 22a and the receiving antenna 22b, the strength of the radio waves received by the receiving antenna 22b is not affected by the buried object 50 even if the container A is rotating. Since they are the same, they do not change.
従って、検波・増幅回路２４の出力信号は第５図に示す
６２ａとなる。Therefore, the output signal of the detection/amplification circuit 24 becomes 62a shown in FIG.
さらにまた、容器ＡがＸ方向へ移動して送信アンテナ２
２ａまたは受信アンテナ２２ｂが埋設物５０の上付近に
くると、送信アンテナ２２ａ→地面４０→受信アンテナ
２２ｂへと伝搬される電波の強さは容器Ａの半回転ごと
に埋設物５０の影響をうけて変化を生じる。Furthermore, the container A moves in the X direction and the transmitting antenna 2
When the receiving antenna 2a or the receiving antenna 22b comes near the top of the buried object 50, the strength of the radio waves propagated from the transmitting antenna 22a to the ground 40 to the receiving antenna 22b is influenced by the buried object 50 every half rotation of the container A. change.
従って、検波・増幅回路２４から出力せしめられる信号
分には交流会を含み第５図の６３ ａ 、６３ ｂのよ
うな信号となる。Therefore, the signal portion outputted from the detection/amplification circuit 24 includes the exchange meeting, resulting in signals such as 63a and 63b in FIG.
即ち、６３ａは回転する容器Ａが埋設物５０の影響を受
けない位置にあるときの信号であり、６３ｂは埋設物５
０の影響をうけて容器Ａの半回転ごとに生じる信号であ
る。That is, 63a is a signal when the rotating container A is in a position not affected by the buried object 50, and 63b is a signal when the rotating container A is not affected by the buried object 50.
This is a signal generated every half revolution of container A under the influence of zero.
以上のようにアンテナ部すを収納固定する容器Ａがアン
テナ回転駆動装置２３によって回転せしめられながら距
離り。As described above, the container A in which the antenna part is housed and fixed is rotated by the antenna rotation drive device 23 and moved away.
で被探知面である地面４０と平行に移動し、埋設物５０
の上を通過すると、検波・増幅回路２４の出力信号は第
５図に示す６０ａ＞６１ａ、６１ｂ、６２ａ、６３ａ＞
６３ｂとなり、この信号が直流分阻止回路２５へ送られ
る。The buried object 50 moves parallel to the ground 40 which is the surface to be detected.
When the output signal of the detection/amplification circuit 24 passes above 60a>61a, 61b, 62a, 63a> shown in FIG.
63b, and this signal is sent to the DC component blocking circuit 25.
該直流分阻止回路２５では第５図に示す直流分の信号６
０ａ 、６１ ａ 、６２ａ 、６３ａが阻止されて埋
設物５０の影響をうけて生じた信号である交流会の信号
６４ｂが出力せしめられる。The DC component blocking circuit 25 receives the DC component signal 6 shown in FIG.
0a, 61a, 62a, and 63a are blocked, and a signal 64b of the social gathering, which is a signal generated under the influence of the buried object 50, is output.
ここで６４２は０レベルである。Here, 642 is the 0 level.
直流分阻止回路２５から帯域阻止濾波回路２６へ送られ
る信号６４ｂは容器Ａの１回転の２倍に相当する周波数
成分とは異なった周波数成分を有しているので帯域阻止
濾波回路２６を通過して表示部ｅへ送られる。The signal 64b sent from the DC blocker circuit 25 to the band-elimination filter circuit 26 has a frequency component different from the frequency component corresponding to twice one revolution of the container A, so it passes through the band-elimination filter circuit 26. and is sent to the display section e.
表示部ｅへ送られた信号は指示計２７ｂと受話器２８ｂ
をまたはそのいずれかを作動させて埋設物５０の存在を
知らせる。The signal sent to the display section e is sent to the indicator 27b and the receiver 28b.
or any of them to notify the presence of the buried object 50.
一方、第６図は送信アンテナ２２ａと受信アンテナ２２
ｂで構成されるアンテナ部すを収納固定する容器Ａが回
転を停止して被探知面としての地面４０に対して傾斜し
ている場合を示す。On the other hand, FIG. 6 shows the transmitting antenna 22a and the receiving antenna 22.
A case is shown in which the container A that houses and fixes the antenna part constituted by b has stopped rotating and is tilted with respect to the ground 40 as the surface to be detected.
この場合、容器Ａがアンテナ回転駆動装置２３によって
矢印Ｗの方向へ回転せしめられると送信アンテナ２２ａ
と受信アンテナ２２ｂの位置は交互に入れかわる。In this case, when the container A is rotated in the direction of the arrow W by the antenna rotation drive device 23, the transmitting antenna 22a
The positions of the receiving antenna 22b and the receiving antenna 22b are alternately switched.
つぎに、埋設物を探知する場合を第６図と第７図によっ
て説明する。Next, the case of detecting a buried object will be explained with reference to FIGS. 6 and 7.
第６図において、容器Ａは地面４０と傾斜して位置して
いるためアンテナ回転駆動装置２３によって容器Ａが矢
印Ｗの方向へ回転せしめられると、送信アンテナ２２ａ
→地面４０→受信アンテナ２２ｂへと伝搬される電波は
容器Ａの半回転ごとに強弱をくり返す。In FIG. 6, since the container A is located at an angle to the ground 40, when the container A is rotated in the direction of the arrow W by the antenna rotation drive device 23, the transmitting antenna 22a
The radio waves propagated from → the ground 40 → the receiving antenna 22b repeat their strength and weakness every half rotation of the container A.
従って、検波・増幅回路２４から出力される信号は第７
図に示す直流分７０ａに交流会７０ｂが重なった信号と
なり、交流会７０ｂの周波数は容器Ａの１回転につき２
倍の周波数となる。Therefore, the signal output from the detection/amplification circuit 24 is
The signal is obtained by superimposing the alternating current component 70b on the DC component 70a shown in the figure, and the frequency of the alternating current component 70b is 2 per rotation of container A.
The frequency will be doubled.
つぎに、容器ＡがＸ方向へ移動して、送信アンテナ２２
ａまたは受信アンテナ２２ｂが埋設物５０の上付近にく
ると、送信アンテナ２２ａ→地面４０→受信アンテナ２
２ｂへと伝搬される電波の強さは、アンテナ回転駆動装
置２３によって回転せしめられている容器Ａの半回転ご
とに埋設物５０の影響をうけて変化が生じる。Next, the container A moves in the X direction, and the transmitting antenna 22
When the receiving antenna a or the receiving antenna 22b comes near the top of the buried object 50, the transmitting antenna 22a → the ground 40 → the receiving antenna 2
The strength of the radio waves propagated to 2b changes due to the influence of the buried object 50 every half rotation of the container A rotated by the antenna rotation drive device 23.
即ち、第７図に示す７１ｃは埋設物５０の影響をうけて
容器Ａの半回転ごとに生じる信号であり直流分７１ａと
交流会７１ｂに重なった信号となる。That is, 71c shown in FIG. 7 is a signal generated every half rotation of the container A due to the influence of the buried object 50, and is a signal that overlaps the DC component 71a and the AC component 71b.
さらに、容器ＡがＸ方向へ移動して送信アンテナ２２ａ
と受信アンテナ２２ｂの中間点３０が埋設物の上付近に
くると、送信アンテナ２２ａから発射された電波は地面
４０と埋設物５０から反射して受信アンテナ２２ｂに達
するので受信アンテナ２２ｂで受信される電波の強さは
、埋設物のない場合に比べて強くなる。Furthermore, the container A moves in the X direction and the transmitting antenna 22a
When the intermediate point 30 of the receiving antenna 22b is near the top of the buried object, the radio waves emitted from the transmitting antenna 22a are reflected from the ground 40 and the buried object 50 and reach the receiving antenna 22b, so that they are received by the receiving antenna 22b. The strength of the radio waves will be stronger than if there were no buried objects.
ところが埋設物５０の影響は容器Ａが回転していても常
に同じであるので、受信アンテナ２２ｂで受信される電
波には埋設物５０に起因する変化は生じない。However, since the influence of the buried object 50 is always the same even when the container A rotates, no change due to the buried object 50 occurs in the radio waves received by the receiving antenna 22b.
従って、検波・増幅回路２４の出力信号は第７図に示す
直流分７２ａに交流外７２ｂが重なった信号となる。Therefore, the output signal of the detection/amplification circuit 24 becomes a signal in which the DC component 72a and the AC component 72b are superimposed, as shown in FIG.
さらにまた、容器ＡがＸ方向へ移動して送信アンテナ２
２ａまたは受信アンテナ２２ｂが埋設物５０の上付近に
くると、送信アンテナ２２ａ→地面４０→受信アンテナ
２２ｂへと伝搬される電波の強さは、容器Ａの半回転ご
とに埋設物５０の影響をうけて変化を生じる。Furthermore, the container A moves in the X direction and the transmitting antenna 2
When the receiving antenna 2a or the receiving antenna 22b comes close to the top of the buried object 50, the strength of the radio waves propagated from the transmitting antenna 22a → the ground 40 → the receiving antenna 22b will change depending on the influence of the buried object 50 every half rotation of the container A. Changes occur in response.
即ち、第７図に示す７３ｃは埋設物５０の影響をうけて
容器Ａの半回転ごとに生じる信号であり、直流分７３ａ
と交流外７３ｂに重なった信号となる。That is, 73c shown in FIG. 7 is a signal generated every half rotation of the container A due to the influence of the buried object 50, and the DC component 73a
This becomes a signal superimposed on the AC outside 73b.
以上のように、アンテナ部すを収納固定する容器Ａがア
ンテナ回転駆動装置２３によって回転せしめられながら
距離り。As described above, the container A that stores and fixes the antenna part is rotated by the antenna rotation drive device 23 and moved away.
で被探知面である地面４０と傾斜した状態で移動し、埋
設物５０の上を通過すると検波・増幅回路２４の出力信
号は第７図に示す直流分７０ａ 、７１ ａ 、７２ａ
、７３ａと交流外７０ｂ、７１ｂ、７１Ｃｊ７２ｂ。When the detection surface 40 is inclined to the ground surface 40 and passes over the buried object 50, the output signal of the detection/amplification circuit 24 becomes DC components 70a, 71a, 72a as shown in FIG.
, 73a and AC outside 70b, 71b, 71Cj72b.
７３ｂ、７３ｃとなり直流分阻止回路２５へ送られる。73b and 73c and sent to the DC component blocking circuit 25.
直流分阻止回路２５では第７図に示す直流分７０ａ 、
７１ ａ 、７２ａ 、７３ａが阻止され、交流外７０
ｂ、７１ｂ、７１ｃ、７２ｂ、７３ｂ。In the DC component blocking circuit 25, the DC component 70a shown in FIG.
71a, 72a, 73a are blocked and the AC outside 70
b, 71b, 71c, 72b, 73b.
７３ｃのみとなって帯域阻止濾波回路２６へ送られる。73c and is sent to the band-elimination filter circuit 26.
直流分阻止回路２５から送られた信号の交流外７０ｂ、
７１ｂ、７１ｃ、７２ｂ、７３ｂ。AC outside 70b of the signal sent from the DC component blocking circuit 25;
71b, 71c, 72b, 73b.
γ３ｃのうちの交流外７０ｂと７１ｂと７２ｂと７３ｂ
は容器Ａの１回転の２倍に相当する周波数成分を有して
いるので容器Ａの１回転の２倍に相当する周波数成分を
阻止する帯域阻止濾波回路２６で阻止され、埋設物５０
の影響をうけて生じた交流外７１ｃと７３ｃｌｒｉ容器
Ａの１回転の２倍に相当する周波数成分とは異なった周
波数成分を有しているので帯域阻止濾波回路２６を通過
して交流外７４Ｃとなる。AC outside 70b, 71b, 72b and 73b of γ3c
has a frequency component corresponding to twice one rotation of container A, so it is blocked by the band rejection filter circuit 26 which blocks the frequency component corresponding to twice one rotation of container A, and the buried object 50
Since the AC outside 71c and 73, which are generated under the influence of Become.
７４ａは０レベルである。こうして上記帯域阻止濾波回
路２６の出カフ４ｃは指示部ｅを作動させて埋設物５０
の存在を知らせる。74a is 0 level. In this way, the output cuff 4c of the band-elimination filter circuit 26 operates the indicator e, and the buried object 50
announce the existence of
以上のようにこの発明によれば、一つの送信アンテナと
一つの受信アンテナからなるアンテナ部すをアンテナ回
転駆動装置２３で回転せしめるように構成し、信号処理
部ｄではアンテナ部すを収納固定する容器Ａの地面４０
に対する傾斜によって生じる不要信号を除去するように
構成したので、本装置を常に被探知面と平行して使用す
る必要がなく、探知操作が容易となる効果があり、それ
だけ探知作業をスピーディに行うことができる効果があ
り、土中等の埋設物のみを確実に探知することができる
効果がある。As described above, according to the present invention, the antenna section consisting of one transmitting antenna and one receiving antenna is configured to be rotated by the antenna rotation drive device 23, and the antenna section is housed and fixed in the signal processing section d. Ground 40 of container A
Since the device is configured to remove unnecessary signals caused by inclination to the surface, there is no need to always use this device in parallel with the surface to be detected, which has the effect of making detection operations easier and speedier. It has the effect of being able to reliably detect only buried objects such as soil.
第１図は従来の埋設物の探知装置を示す系統ブロック図
、第２図はこの発明に係る装置の一実施例である回転す
るアンテナを持つ埋設物探知装置の系統ブロック図、第
３図は同実施例におけるアンテナ部のアンテナの配置を
示す平面図、第４図及び第６図はこの発明に係る装置に
より土中の埋設物を探知する場合の動作説明図、第５図
及び第７図は同波形説明図である。
ａ・・・・・・信号発生部、ｂ・・・・・・アンテナ部
、Ｃ・・・・・・アンテナ回転駆動部、ｄ・・・・・・
信号処理部、ｅ・・・・・・表示部、２０・・・・・・
発振器、２１−０．・・・減衰器、２２ａ・・・・・・
送信アンテナ、２２ｂ・・・・・・受信アンテナ、２３
・・・・・・アンテナ回転駆動装置、２４・・・・・・
検波・増幅回路、２５・・・・・・直流分阻止回路、２
６・・・・・・帯域阻止濾波回路、２７ａ・・・・・・
指示計変換回路、２７ｂ・・・・・・指示計、２８ａ・
・・・・・音響変換回路、２８ｂ・・・・・・受話器、
４０・・・・・・被探知面としての地面。FIG. 1 is a system block diagram showing a conventional buried object detection device, FIG. 2 is a system block diagram of a buried object detection device with a rotating antenna, which is an embodiment of the device according to the present invention, and FIG. 3 is a system block diagram showing a buried object detection device according to the present invention. FIGS. 4 and 6 are plan views showing the arrangement of the antennas of the antenna section in the same embodiment, and FIGS. is an explanatory diagram of the same waveform. a...Signal generation section, b...Antenna section, C...Antenna rotation drive section, d...
Signal processing unit, e...Display unit, 20...
Oscillator, 21-0. ...Attenuator, 22a...
Transmitting antenna, 22b...Receiving antenna, 23
...Antenna rotation drive device, 24...
Detection/amplification circuit, 25...DC blocker circuit, 2
6...Band rejection filter circuit, 27a...
Indicator conversion circuit, 27b... Indicator, 28a.
...Acoustic conversion circuit, 28b...Telephone receiver,
40... Ground as the surface to be detected.
Claims (1)
生部からの信号を送信せしめる１個の送信アンテナと上
記１個の送信アンテナと組をなした１個の受信アンテナ
からなるアンテナ部と、上記アンテナ部を回転せしめる
アンテナ回転駆動装置からなるアンテナ回転駆動部と、
上記受信アンテナの受信した信号を検波・増幅する回路
と直流分を阻止する回路と上記アンテナ回転駆動装置に
よって回転せしめられる上記アンテナ部の回転周期の２
倍に相当する周波数成分のみを阻止する帯域阻止濾波回
路からなる信号処理部と、指示計と受話器のなかの少な
くともひとつからなる表示部と、を具備しており、上記
アンテナ部を収納固定する容器が被探知面に対して平行
でなくなった場合に生じる信号分を除去する構成とされ
たことを特徴とする回転するアンテナを持つ埋設物探知
装置。1. An antenna section consisting of a signal generating section consisting of at least an oscillator, one transmitting antenna for transmitting a signal from the signal generating section, and one receiving antenna paired with the one transmitting antenna, and the above antenna. an antenna rotation drive section consisting of an antenna rotation drive device for rotating the antenna section;
2 of the rotation period of the antenna unit rotated by a circuit for detecting and amplifying the signal received by the receiving antenna, a circuit for blocking a DC component, and the antenna rotation drive device.
A container for storing and fixing the antenna unit, comprising a signal processing unit consisting of a band rejection filter circuit that blocks only frequency components corresponding to twice the frequency, and a display unit consisting of at least one of an indicator and a receiver. 1. A buried object detection device having a rotating antenna, characterized in that the antenna is configured to remove a signal generated when the antenna is no longer parallel to a surface to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55104353A JPS59793B2 (en) | 1980-07-31 | 1980-07-31 | Buried object detection device with rotating antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55104353A JPS59793B2 (en) | 1980-07-31 | 1980-07-31 | Buried object detection device with rotating antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5729982A JPS5729982A (en) | 1982-02-18 |
| JPS59793B2 true JPS59793B2 (en) | 1984-01-09 |
Family
ID=14378509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55104353A Expired JPS59793B2 (en) | 1980-07-31 | 1980-07-31 | Buried object detection device with rotating antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59793B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03108689U (en) * | 1990-02-26 | 1991-11-08 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0349110B1 (en) * | 1988-05-27 | 1992-03-11 | British Gas plc | Ground probing radar method and apparatus |
| JPH02101295U (en) * | 1989-01-31 | 1990-08-13 |
-
1980
- 1980-07-31 JP JP55104353A patent/JPS59793B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03108689U (en) * | 1990-02-26 | 1991-11-08 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5729982A (en) | 1982-02-18 |
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