JP3689879B2 - Digital signal transmission method by antenna coupling - Google Patents
Digital signal transmission method by antenna coupling Download PDFInfo
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- JP3689879B2 JP3689879B2 JP32068496A JP32068496A JP3689879B2 JP 3689879 B2 JP3689879 B2 JP 3689879B2 JP 32068496 A JP32068496 A JP 32068496A JP 32068496 A JP32068496 A JP 32068496A JP 3689879 B2 JP3689879 B2 JP 3689879B2
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- inclinometer
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- digital signal
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- measuring device
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- 238000000034 method Methods 0.000 title claims description 21
- 230000008054 signal transmission Effects 0.000 title claims description 11
- 230000008878 coupling Effects 0.000 title claims description 8
- 238000010168 coupling process Methods 0.000 title claims description 8
- 238000005859 coupling reaction Methods 0.000 title claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Description
【発明の属する技術分野】
この発明は，人が近づけない場所に設置した測定装置から受信装置にデジタル信号を伝送する方法に関わる．この方法は，特に，地中に埋設して長期間使用する測定装置のデータ伝送方法に関わり，測定装置を落雷から保護する構成であるし，測定装置のケーブルを少なくできる構成である．
【従来の技術】
地中に埋設したひずみ計や傾斜計の場合，測定装置の信号線や電源線は装置と一体となっており，これらのケーブルは埋設した測定装置と地表の測定装置との間で，直接接続されている．このため，測定装置のケーブルが長くなると重量が増加し測定装置を埋設しにくい．また，この信号線が長くなると誘導電圧の影響で測定結果が乱れるし，落雷によって生じる高い誘導電圧で，埋設した測定装置の電子回路が故障する．電子回路が故障した場合，経費をかけて測定装置を再設置せねばならない．
【発明が解決しようとする課題】
この発明では，測定装置に信号線を取り付けることなくデジタル信号を受信装置に伝送する方法を提供する．また，測定装置に電力を送る同軸ケーブルを介して信号を伝送し，ケーブルの重量を減らす方法を提供する．
【課題を解決するための手段】
人が近づけない場所に設置した測定装置のデジタル信号を受信装置に伝送する方式において，本発明で講じた手段は，図１で示したように測定装置近傍にカップリングさせたアンテナ１００を設け，電波を介して同軸ケーブルで信号を伝送するようにしたことである．
【発明の実施の形態】
本発明の実施例を図２で示した．図２において，地中に埋設した測定装置２００にデジタル値を電波に変換するユニット２０１を設け，その２０１にアンテナ２０２を設ける．この２０２より電波を送出し，カップリングさせたアンテナ２０３で受信する．２０３は地表の受信装置２０５に取り付けた同軸ケーブル２０４の先端に設ける．アンテナ２０２と２０３のカップリングは２００の内部か近傍で行う．２０５では伝送された電波による信号をデジタル信号に変換する．２０１で微弱電波で信号を送出したとしても２０２と２０３を２から３ｃｍの距離でカップリングさせれば電界強度は十分大きく，同軸ケーブルであれば１Ｋｍ程度の距離まで信号の伝送ができる．カップリングの距離を短くすれば電界強度はより大きくなって，信号の伝送距離を長くできる．
図３は埋設した測定装置の電源線に同軸ケーブルを使用し，この同軸ケーブルと信号線を兼用する実施例である．図２と同様に，埋設した測定装置３００にデジタル信号を電波に変換するユニット３０１を設け，その３０１にアンテナ３０２を設ける．この３０２とカップリングさせたアンテナ３０３を，コンデンサー３０６を介して地表の受信装置３０５に取り付けた同軸ケーブル３０４の先端に取り付ける．アンテナのカップリングは３００の内部か近傍で行う．３０５の直流電源用の電源線としての３０４と３０３を，３０６を使用して接続しても，インピーダンスをマッチングさせればデータ伝送は可能である．必要であればマッチングに複数の３０６を使用する．
図４は，図２や図３とは信号の伝送方向が逆になった構成の実施例である．この実施例では，地表の送信装置４０５より埋設した測定装置の制御信号等のデジタル信号を電波に変換し，その変換された電波を同軸ケーブル４０４で送信し，カップリングされたアンテナ４０３，４０２を介してその電波を受信ユニット４０１で受信し，埋設した測定装置４００でデジタル信号に変換する．４０５で微弱電波で信号を送出したとしても４０２と４０３を２から３ｃｍの距離でカップリングさせれば電界強度は十分大きく，同軸ケーブルであれば１Ｋｍ程度の距離まで信号の伝送ができる．前述の場合と同様に，カップリングの距離を短くすれば電界強度を大きくできるため，信号の伝送距離が長くなる．
図２から図４の実施例で記述した信号の伝送方法は，測定装置を地中に埋設して使用する場合についてである．測定装置を海底や水中に設置しても前述した方法で信号の伝送ができるし，人が近づくと危険である地滑り地帯や建造物内部に測定装置を設置した場合でも前記した方法で信号の伝送ができる．
【発明の効果】
この発明では，人が近づけない場所に設置した測定装置の信号線をなくする方法を提供した．この方法であれば，１）測定装置は信号線を介して進入する誘導電圧の影響を受けなくなり，測定結果が乱れない．また，２）故障の原因である落雷の影響による誘導電圧が，設置した測定装置の電子回路に加わらなくなる．電子回路が故障しなければ測定装置を再設置する経費を削減できる．一方，設置した測定装置の電源線と信号線を兼用すれば，測定装置に取り付けるケーブルの重量を減らすことができ，測定装置を設置しやすくする．
ファイバー線を用いて光によってデータの伝送を行えば，上記した１），２）の問題は解決できる．けれども，現時点では，ファイバー線をステンレスパイプに入れる必要がある．このため，ケーブルを簡単に曲げることができず，測定装置が設置しにくい．また，光を用いた信号の伝送方法は消費電流が多く，微弱電波により信号を伝送する場合の約１０倍になる．したがって，測定装置を離れた地点に設置したり，深い地点に埋設するには，電源線による電圧降下が小さい微弱電波による方法が優れている．しかも，周波数の違う電波を使用すれば，同じ同軸ケーブルで複数の地点から，同時に，データ伝送することが可能である．
【図面の簡単な説明】
【図１】 カップリングさせたアンテナの概念図．
【図２】 本発明による実施例のブロック図．
【図３】 本発明による他の実施例のブロック図．
【図４】 本発明による他の実施例のブロック図．
【符号の説明】
１００ ‥‥ カップリングさせたアンテナ，
２００ ‥‥ 埋設した測定装置， ２０１ ‥‥ 電波の送信ユニット，
２０２ ‥‥ アンテナ， ２０３ ‥‥ アンテナ，
２０４ ‥‥ 同軸ケーブル， ２０５ ‥‥ 地表の受信装置，
３００ ‥‥ 埋設した測定装置， ３０１ ‥‥ 電波の送信ユニット，
３０２ ‥‥ アンテナ， ３０３ ‥‥ アンテナ，
３０４ ‥‥ 同軸ケーブル， ３０５ ‥‥ 地表の受信装置，
３０６ ‥‥ コンデンサー，
４００ ‥‥ 埋設した測定装置， ４０１ ‥‥ 電波の受信ユニット，
４０２ ‥‥ アンテナ， ４０３ ‥‥ アンテナ，
４０４ ‥‥ 同軸ケーブル， ４０５ ‥‥ 地表の受信装置，BACKGROUND OF THE INVENTION
The present invention relates to a method of transmitting a digital signal from a measuring apparatus installed in a place where a person cannot approach to a receiving apparatus. This method is particularly concerned with the data transmission method of a measuring device that is buried in the ground and used for a long period of time, and is a configuration that protects the measuring device from lightning strikes and can reduce the number of cables of the measuring device.
[Prior art]
In the case of strain gauges and inclinometers buried in the ground, the signal lines and power lines of the measuring device are integrated with the equipment, and these cables are directly connected between the buried measuring device and the surface measuring device. It has been done. For this reason, when the cable of the measuring device becomes long, the weight increases and it is difficult to embed the measuring device. In addition, if this signal line becomes long, the measurement results are disturbed by the influence of the induced voltage, and the high induced voltage caused by lightning strikes the electronic circuit of the embedded measuring device. If an electronic circuit breaks down, the measuring device must be re-installed at a cost.
[Problems to be solved by the invention]
The present invention provides a method for transmitting a digital signal to a receiving device without attaching a signal line to the measuring device. It also provides a method to reduce the weight of the cable by transmitting the signal through a coaxial cable that sends power to the measuring device.
[Means for Solving the Problems]
In the method of transmitting a digital signal of a measuring device installed in a place where a person cannot approach to the receiving device, the means taken in the present invention is provided with an
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention is shown in FIG. In FIG. 2, a
Fig. 3 shows an example in which a coaxial cable is used for the power line of the embedded measuring device, and this coaxial cable is used as a signal line. As in FIG. 2, a
FIG. 4 shows an embodiment in which the signal transmission direction is reversed from that in FIGS. In this embodiment, a digital signal such as a control signal of a measuring device embedded from a
The signal transmission method described in the embodiment of FIGS. 2 to 4 is for the case where the measuring device is buried in the ground. Even if the measuring device is installed on the sea floor or underwater, the signal can be transmitted by the method described above. Even if the measuring device is installed in a landslide area or building that is dangerous when people approach, the signal transmission is performed by the method described above. Is possible.
【The invention's effect】
In the present invention, a method for eliminating the signal line of a measuring device installed in a place where a person cannot approach is provided. With this method, 1) the measuring device is not affected by the induced voltage entering through the signal line, and the measurement results are not disturbed. In addition, 2) Induced voltage due to the effect of lightning, which is the cause of the failure, will not be applied to the electronic circuit of the installed measuring device. If the electronic circuit does not fail, the cost of re-installing the measuring device can be reduced. On the other hand, if the power line and signal line of the installed measuring device are combined, the weight of the cable attached to the measuring device can be reduced and the measuring device can be installed easily.
If data is transmitted by light using fiber, the problems 1) and 2) described above can be solved. However, at present, it is necessary to put the fiber wire into the stainless steel pipe. For this reason, the cable cannot be bent easily and the measuring device is difficult to install. In addition, the signal transmission method using light consumes a lot of current, which is about 10 times as much as the signal transmission using weak radio waves. Therefore, to install the measuring device at a remote location or embed it deeply, the method using a weak radio wave with a small voltage drop due to the power line is excellent. Moreover, if radio waves with different frequencies are used, data can be transmitted simultaneously from multiple points using the same coaxial cable.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a coupled antenna.
FIG. 2 is a block diagram of an embodiment according to the present invention.
FIG. 3 is a block diagram of another embodiment according to the present invention.
FIG. 4 is a block diagram of another embodiment according to the present invention.
[Explanation of symbols]
100 ... the coupled antenna,
200 ... buried measuring device, 201 ... radio wave transmission unit,
202 ... Antenna, 203 ... Antenna,
204 ... Coaxial cable, 205 ... Ground surface receiver,
300 ... buried measuring device, 301 ... radio wave transmission unit,
302 ... Antenna, 303 ... Antenna,
304 ... Coaxial cable, 305 ... Ground surface receiver,
306 ... condenser,
400 ... buried measuring device, 401 ... radio wave receiving unit,
402 ... Antenna, 403 ... Antenna,
404 ... coaxial cable, 405 ... ground surface receiver,
Claims (3)
デジタル化した信号を電波に変換する手段と，
落雷によって歪計や傾斜計と一体となっている長い信号線や電源線に生じる誘導電圧から，歪計や傾斜計内部の電子回路を保護するために，前記手段により変換した電波を，
歪計や傾斜計内部において２〜３ｃｍの距離でカップリングさせた同軸ケーブルの先端に付けたアンテナを介して同軸ケーブルで送出する手段と，
前記手段により送出された電波を，ボーリング孔に埋設した歪計や傾斜計と一体となっている長い信号線や電源線と接続されている受信装置で，
デジタル信号に変換する手段，
を有することを特徴とするアンテナカップリングによるデジタル信号伝送方法． In a method of transmitting digital data from a borehole strain meter or inclinometer that is buried in a borehole and used for a long period of time, a long signal line or power line is integrated with the borehole strain meter or inclinometer. A strain gauge or inclinometer for boreholes configured to be connected to the ground receiver.
Means for converting digitized signals into radio waves;
In order to protect the electronic circuit inside the strain gauge and inclinometer from the induced voltage generated in the long signal line and power line integrated with the strain gauge and inclinometer by lightning strike,
Means for sending out with a coaxial cable via an antenna attached to the tip of the coaxial cable coupled at a distance of 2 to 3 cm inside the strain gauge or inclinometer;
A receiver connected to a long signal line or power line integrated with a strain gauge or inclinometer embedded in a borehole ,
Means for converting to a digital signal,
A digital signal transmission method by antenna coupling characterized by comprising:
長い同軸ケーブルが信号線と電源線を兼ねていること，
を特徴とする請求項１記載のアンテナカップリングによるデジタル信号伝送方法． In a method of transmitting digital data from a strain meter or inclinometer for boreholes that are buried in a borehole and used for a long period of time to a receiver installed on the ground surface,
A long coaxial cable doubles as a signal line and a power line,
A digital signal transmission method by antenna coupling according to claim 1.
地表に設置したデータ送信装置から，ボーリング孔に埋設して長期間使用するボアホール用の歪計や傾斜計にデジタル信号を送ること，
を特徴とするアンテナカップリングによるデジタル信号伝送方法． In a method of transmitting digital data to a receiving device installed on the ground surface from a borehole strain needle or inclinometer that is buried in a borehole and used for a long period of time, the method according to claim 1,
From the data transmission apparatus installed on the ground, sending a digital signal to the distortion meter or inclinometer for borehole be used for a long time is embedded in the borehole,
A digital signal transmission method using antenna coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32068496A JP3689879B2 (en) | 1996-10-25 | 1996-10-25 | Digital signal transmission method by antenna coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32068496A JP3689879B2 (en) | 1996-10-25 | 1996-10-25 | Digital signal transmission method by antenna coupling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10135885A JPH10135885A (en) | 1998-05-22 |
| JP3689879B2 true JP3689879B2 (en) | 2005-08-31 |
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ID=18124188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32068496A Expired - Fee Related JP3689879B2 (en) | 1996-10-25 | 1996-10-25 | Digital signal transmission method by antenna coupling |
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| Country | Link |
|---|---|
| JP (1) | JP3689879B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013035789A1 (en) | 2011-09-07 | 2013-03-14 | Shimizu Shigejiro | Connector for electric conduction |
-
1996
- 1996-10-25 JP JP32068496A patent/JP3689879B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013035789A1 (en) | 2011-09-07 | 2013-03-14 | Shimizu Shigejiro | Connector for electric conduction |
| US9130319B2 (en) | 2011-09-07 | 2015-09-08 | Shigejiro Shimizu | Connector with spring controlled electrode and sealing |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10135885A (en) | 1998-05-22 |
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