JPS6338084U - - Google Patents
Info
- Publication number
- JPS6338084U JPS6338084U JP13069186U JP13069186U JPS6338084U JP S6338084 U JPS6338084 U JP S6338084U JP 13069186 U JP13069186 U JP 13069186U JP 13069186 U JP13069186 U JP 13069186U JP S6338084 U JPS6338084 U JP S6338084U
- Authority
- JP
- Japan
- Prior art keywords
- ultrasonic
- envelope detection
- circuit
- detection output
- wave
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 10
- 230000035945 sensitivity Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 1
Landscapes
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
第１図は、この考案の超音波センサの一実施例
を示す回路構成図、第２図は、第１図に示した回
路各部の信号波形図、第３図は、従来の超音波セ
ンサを適用した後方確認装置の一例を示す概略構
成図である。
３……超音波送信器、４……超音波受信器、１
１……超音波センサ、１２……包絡線検波回路、
１３……比較回路、１５……距離演算回路。
Fig. 1 is a circuit configuration diagram showing one embodiment of the ultrasonic sensor of this invention, Fig. 2 is a signal waveform diagram of each part of the circuit shown in Fig. 1, and Fig. 3 is a diagram showing a conventional ultrasonic sensor. It is a schematic block diagram which shows an example of the applied rear confirmation device. 3... Ultrasonic transmitter, 4... Ultrasonic receiver, 1
1... Ultrasonic sensor, 12... Envelope detection circuit,
13... Comparison circuit, 15... Distance calculation circuit.
Claims (1)
、この超音波送信器から送信され物体に当たつて
反射してきた超音波を受信する超音波受信器と、
この超音波受信器の出力を包絡線検波する包絡線
検波回路と、この包絡線検波回路の包絡線検波出
力を一定の基準値と比較し、この基準値を越える
包絡線検波出力を検知する比較回路と、この比較
回路の検知出力と送信超音波の時間差にもとづい
て前記物体までの距離を演算する距離演算回路と
からなり、前記包絡線検波回路は、受信感度が飽
和状態か又はそれに近い状態に設定してあり、前
記比較回路は、超音波送信器から超音波受信器に
直接到達する直達波に続く直達残響波に関する包
絡線検波出力と、直達残響波に重なる至近物体か
らの反射超音波に関する包絡線検波出力との中間
の大きさをもつ基準値が設定されたことを特徴と
する超音波センサ。 an ultrasonic transmitter that transmits ultrasonic waves accompanied by reverberant waves; an ultrasonic receiver that receives the ultrasonic waves that are transmitted from the ultrasonic transmitter and are reflected by hitting an object;
An envelope detection circuit that detects the envelope of the output of this ultrasonic receiver, and a comparison that compares the envelope detection output of this envelope detection circuit with a certain reference value and detects an envelope detection output that exceeds this reference value. circuit, and a distance calculation circuit that calculates the distance to the object based on the time difference between the detection output of the comparison circuit and the transmitted ultrasonic wave, and the envelope detection circuit has a reception sensitivity that is at or near saturation. The comparator circuit outputs an envelope detection output related to a direct reverberation wave following a direct wave directly reaching the ultrasonic receiver from an ultrasonic transmitter, and a reflected ultrasonic wave from a nearby object that overlaps with the direct reverberation wave. 1. An ultrasonic sensor characterized in that a reference value having a magnitude intermediate between the envelope detection output and the envelope detection output is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13069186U JPH041511Y2 (en) | 1986-08-27 | 1986-08-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13069186U JPH041511Y2 (en) | 1986-08-27 | 1986-08-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6338084U true JPS6338084U (en) | 1988-03-11 |
| JPH041511Y2 JPH041511Y2 (en) | 1992-01-20 |
Family
ID=31028433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13069186U Expired JPH041511Y2 (en) | 1986-08-27 | 1986-08-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH041511Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0261582A (en) * | 1988-08-26 | 1990-03-01 | Matsushita Electric Works Ltd | Ultrasonic detector |
-
1986
- 1986-08-27 JP JP13069186U patent/JPH041511Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0261582A (en) * | 1988-08-26 | 1990-03-01 | Matsushita Electric Works Ltd | Ultrasonic detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH041511Y2 (en) | 1992-01-20 |
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