JPS6118146B2 - - Google Patents
Info
- Publication number
- JPS6118146B2 JPS6118146B2 JP49127793A JP12779374A JPS6118146B2 JP S6118146 B2 JPS6118146 B2 JP S6118146B2 JP 49127793 A JP49127793 A JP 49127793A JP 12779374 A JP12779374 A JP 12779374A JP S6118146 B2 JPS6118146 B2 JP S6118146B2
- Authority
- JP
- Japan
- Prior art keywords
- wave
- detected
- present
- level
- transmitter
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Train Traffic Observation, Control, And Security (AREA)
- Traffic Control Systems (AREA)
- Geophysics And Detection Of Objects (AREA)
- Radar Systems Or Details Thereof (AREA)
- Sorting Of Articles (AREA)
- Control Of Metal Rolling (AREA)
Description
【発明の詳細な説明】
本発明は物体の存在検知装置に関し、とくにマ
イクロ波を用いた物体存在検知装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an object presence detection device, and more particularly to an object presence detection device using microwaves.
マイクロ波の送信機と受信機をある一定間隔を
おいて対置させ送受信を行なうと、両者の間に物
体がある場合と無い場合で受信レベルに差が生ず
る。この差をもつて物体の有無を検知することが
従来から行なわれている。この方法は自動車等の
車両検知、踏切での妨害物検知、流れ作業におけ
るコンベア上の金属物体検知用等に応用されてい
る。 When a microwave transmitter and a receiver are placed opposite each other at a certain distance and transmit and receive signals, a difference occurs in the reception level depending on whether there is an object between them or not. Conventionally, the presence or absence of an object has been detected using this difference. This method is applied to detecting vehicles such as automobiles, detecting obstacles at railroad crossings, and detecting metal objects on conveyors in assembly lines.
しかし、実際の問題として送受信機間をよぎる
物体は一定の大きさまたは一定の形状とは限らな
い。極めて小型で電波をしや断する面積が小さい
場合、または金属以外の物体で電波をしや断しに
くい物体等の存在を検知する場合、受信レベルの
差は当然少くなる。これら物体の存在検知の確度
をあげるためには、できるだけレベル差を大きく
とつてやることが必要である。 However, as a practical matter, objects that pass between transmitters and receivers are not necessarily of a constant size or shape. If the device is extremely small and has a small area for transmitting radio waves, or if the presence of an object other than metal that is difficult to interrupt radio waves is detected, the difference in reception level will naturally be small. In order to increase the accuracy of detecting the presence of these objects, it is necessary to make the level difference as large as possible.
本発明の目的は、以上の検知しにくい物体をも
容易に検知できる物体存在検知装置を提供するに
ある。本発明によれば、送受信機の対向点に周波
数逓倍する手段を設けることにより、従来方式の
レベル差の２乗に比例したレベルを検出できる。 An object of the present invention is to provide an object presence detection device that can easily detect objects that are difficult to detect as described above. According to the present invention, a level proportional to the square of the level difference in the conventional system can be detected by providing frequency multiplication means at opposing points of the transmitter and receiver.
以下図面を用いて詳細に説明する。 This will be explained in detail below using the drawings.
第１図は、従来方式の物体存在検知装置を示し
たもので、送信機１の出力はアンテナ２から放射
され、アンテナ３によつて受波され、受信機４に
よつて受信信号として検出される。この場合、ア
ンテナ２とアンテナ３の間に被検知物体５が存在
すると受信レベルは低下するので、このときのレ
ベルと何も存在しないときのレベル差を検出する
ことによつて、物体の存在を検知することが可能
である。しかし小物体等の場合は、レベル差が小
さく誤動作を起し易い欠点がある。 FIG. 1 shows a conventional object presence detection device, in which the output of a transmitter 1 is radiated from an antenna 2, received by an antenna 3, and detected as a received signal by a receiver 4. Ru. In this case, if there is a detected object 5 between the antennas 2 and 3, the reception level will drop, so by detecting the difference between the level at this time and the level when nothing is present, the presence of the object can be detected. It is possible to detect it. However, in the case of small objects, the level difference is small and malfunctions are likely to occur.
第２図は、本発明による物体存在検知装置の一
実施例を示すもので、２１は送信機、２２は送信
アンテナ、２３は受信アンテナ、２４は周波数逓
倍器、２５は逓倍波送信アンテナ、２６は逓倍波
受信アンテナ、２７は逓倍波受信機である。送信
機２１からの出力信号波は送信アンテナ２２から
放射され、受信アンテナ２３によつて受信され
る。この場合、被検知物体５またはその他の部分
からの反射波は、逓倍波受信アンテナ２６および
これに接続せる回路の遮断周波数が高いので、こ
の反射波は逓倍波受信機２７には受信されない。
受信アンテナ２３で受信された信号波は周波数逓
倍器２４によつて、任意の定められた倍数に逓倍
された後逓倍波送信アンテナ２５から再び放射さ
れる。放射された逓倍波は、逓倍波受信アンテナ
２６によつて受信され、逓倍波受信機２７におい
て受信レベルが検出される。周波数逓信器２４に
は、一般的にバラクタダイオードの非直線による
周波数逓信器を用いると良い。本発明によれば、
従来方式の装置に比べ信号波が被検知物体５をよ
ぎる回数が多いので、その分だけレベル差を大き
くとれる。 FIG. 2 shows an embodiment of the object presence detection device according to the present invention, in which 21 is a transmitter, 22 is a transmitting antenna, 23 is a receiving antenna, 24 is a frequency multiplier, 25 is a multiplication wave transmitting antenna, 26 2 is a multiplication wave receiving antenna, and 27 is a multiplication wave receiver. The output signal wave from the transmitter 21 is radiated from the transmitting antenna 22 and received by the receiving antenna 23. In this case, the reflected waves from the object to be detected 5 or other parts are not received by the multiplied wave receiver 27 because the cutoff frequency of the multiplied wave receiving antenna 26 and the circuit connected thereto is high.
The signal wave received by the receiving antenna 23 is multiplied by a predetermined multiple by the frequency multiplier 24, and then radiated again from the multiplied wave transmitting antenna 25. The radiated multiple wave is received by the multiple wave receiving antenna 26, and the received level is detected by the multiple wave receiver 27. As the frequency transmitter 24, it is generally preferable to use a frequency transmitter using a nonlinear varactor diode. According to the invention,
Since the signal wave crosses the detected object 5 more times than in conventional devices, the level difference can be increased accordingly.
いま、被検知物体５のある場合とない場合のレ
ベル差について分り易く説明するために、数式を
用いて表わすと次に示すごとくなる。 Now, in order to clearly explain the level difference between when the detected object 5 is present and when the detected object 5 is not present, a mathematical formula is used to express it as shown below.
物体有無のレベル差Ｓ＝ＰＲ／ＰＲ′＝Ｌ２ ０
ただし、ここでP1は送信出力、Ｌは放射による伝
ばん損失、L0は物体５による減衰量、Ｋは逓倍
器の変換損失、ＰRは物体５のない場合の受信レ
ベル、ＰR′は物体５のある場合の受信レベルであ
る。 Level difference between presence and absence of object S=P R /P R ′=L 2 0 However, here, P 1 is the transmission output, L is the propagation loss due to radiation, L 0 is the attenuation due to the object 5, K is the conversion loss of the multiplier, P R is the reception level without the object 5, P R ' is the reception level when the object 5 is present.
上式に示すように、従来方式による物体有無の
レベル差は、単に物体５による減衰量L0である
のに対して、本発明によるレベル差は従来方式の
減衰量の２乗Ｌ２ ０として検出される。したがつ
て、たとえば従来方式によるレベル差が10dBで
あつたならば、本発明による20dBとして検出さ
れる。 As shown in the above equation, the level difference between the presence and absence of an object in the conventional method is simply the attenuation amount L 0 due to the object 5, whereas the level difference in the present invention is expressed as the square of the attenuation amount L 2 0 in the conventional method. Detected. Therefore, for example, if the level difference according to the conventional method is 10 dB, it will be detected as 20 dB according to the present invention.
以上詳細に説明したように、本発明によれば、
極めて高いレベル差が得られるので、従来方式の
装置では難しかつた、小物体、電波を透し易い物
体の存在を検知可能な、高性能の物体存在検知装
置を得ることができる。 As explained in detail above, according to the present invention,
Since an extremely high level difference can be obtained, it is possible to obtain a high-performance object presence detection device that can detect the presence of small objects and objects that easily transmit radio waves, which is difficult to do with conventional devices.
なお、実施例においては、簡単のために送信波
を無変調波と想定して説明したが、被変調波とし
た場合でも同様の結果が得られることは勿論であ
り、むしろ増巾器等の関係で実用的である。 In addition, in the examples, explanations have been made assuming that the transmitted wave is an unmodulated wave for the sake of simplicity, but it goes without saying that similar results can be obtained even when the transmitted wave is a modulated wave. Practical in relationship.
第１図は従来方式の物体存在検知装置を示し、
１は送信機、２，３はアンテナ、４は受信機、
５は被検知物体である。第２図は本発明による一
実施例を示した図で、２１は送信機、２２は送信
アンテナ、２３は受信アンテナ、２４は逓倍器、
２５は逓倍波送信アンテナ、２６は逓倍波受信ア
ンテナ、２７は逓倍波受信機である。
Figure 1 shows a conventional object presence detection device, where 1 is a transmitter, 2 and 3 are antennas, 4 is a receiver,
5 is an object to be detected. FIG. 2 is a diagram showing an embodiment according to the present invention, in which 21 is a transmitter, 22 is a transmitting antenna, 23 is a receiving antenna, 24 is a multiplier,
Reference numeral 25 denotes a multiplication wave transmitting antenna, 26 a multiplication wave reception antenna, and 27 a multiplication wave receiver.
Claims (1)
記第１の送信手段に対向配置され前記第１の送信
手段出力を受信する第１の受信手段と、前記第１
の受信手段出力を周波数逓倍するダイオードと、
前記周波数逓倍されたマイクロ波を前記第１の送
信手段出力と逆方向に放射する第２の送信手段
と、前記第２の送信手段に対向配置され前記第２
の送信手段出力を受信する第２の受信手段とから
少なくとも構成される物体存在検知装置。1: a first transmitting means for transmitting microwaves; a first receiving means disposed opposite to the first transmitting means and receiving the output of the first transmitting means;
a diode for frequency-multiplying the output of the receiving means;
a second transmitting means for radiating the frequency-multiplied microwave in a direction opposite to the output of the first transmitting means; and a second transmitting means disposed opposite to the second transmitting means.
and second receiving means for receiving the output of the transmitting means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP49127793A JPS6118146B2 (en) | 1974-11-06 | 1974-11-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP49127793A JPS6118146B2 (en) | 1974-11-06 | 1974-11-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5153842A JPS5153842A (en) | 1976-05-12 |
| JPS6118146B2 true JPS6118146B2 (en) | 1986-05-10 |
Family
ID=14968804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP49127793A Expired JPS6118146B2 (en) | 1974-11-06 | 1974-11-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6118146B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63188039U (en) * | 1987-05-26 | 1988-12-01 | ||
| JPH0322152U (en) * | 1989-07-14 | 1991-03-06 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001188990A (en) * | 1999-12-28 | 2001-07-10 | Exnos Corp | Vehicle sensor |
| JP2005182631A (en) * | 2003-12-22 | 2005-07-07 | Mitsubishi Electric Corp | Mobile body information detection system |
| JP4828815B2 (en) * | 2004-10-06 | 2011-11-30 | 日本信号株式会社 | Metal position detector |
| JP5080937B2 (en) * | 2007-10-30 | 2012-11-21 | Ｎｅｃトーキン株式会社 | Reader / writer and gate system |
-
1974
- 1974-11-06 JP JP49127793A patent/JPS6118146B2/ja not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63188039U (en) * | 1987-05-26 | 1988-12-01 | ||
| JPH0322152U (en) * | 1989-07-14 | 1991-03-06 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5153842A (en) | 1976-05-12 |
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