JPH07280932A - Ultrasonic distance-measuring apparatus - Google Patents

Ultrasonic distance-measuring apparatus

Info

Publication number
JPH07280932A
JPH07280932A JP6073199A JP7319994A JPH07280932A JP H07280932 A JPH07280932 A JP H07280932A JP 6073199 A JP6073199 A JP 6073199A JP 7319994 A JP7319994 A JP 7319994A JP H07280932 A JPH07280932 A JP H07280932A
Authority
JP
Japan
Prior art keywords
distance
gain
ultrasonic
signal
outputs
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
Application number
JP6073199A
Other languages
Japanese (ja)
Inventor
Masahiro Takada
雅弘 高田
Takeshi Yamaguchi
健 山口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP6073199A priority Critical patent/JPH07280932A/en
Publication of JPH07280932A publication Critical patent/JPH07280932A/en
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To avoid that a human being or an animal is subjected continuously to high-output ultrasonic waves at a short distance. CONSTITUTION:The ultrasonic distance-measuring apparatus is provided with a transmitter 1 which transmits ultrasonic waves, a gain-variable amplifier 2 which outputs a driving voltage to the transmitter 1 and whose amplification degree is variable, an oscillator 3 which outputs a burst-like signal, a receiver 4 which receives reflected waves from an object 7 whose distance is to be measured and a signal processing circuit 6 which outputs an oscillating trigger signal 101 to the oscillator 3, which gives a gain instruction signal 102 determining a gain to the gain-variable amplifier 2, which measures the time elapsed until a receiving operation from a transmitting operation and which computes a distance. The signal processing circuit 6 outputs, to the gain amplifier 2, the gain instruction signal 102 which changes the sound pressure of the ultrasonic waves, to be transmitted, according to a distance from the measured object which is to be measured.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、超音波パルスを送波
し、物体からの反射波を受信して、その物体までの距離
を検知する超音波距離測定装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic distance measuring device which transmits ultrasonic pulses, receives reflected waves from an object, and detects the distance to the object.

【0002】[0002]

【従来の技術】従来、超音波を利用した距離センサーや
移動体に取り付けて移動体の周辺との距離を検出するセ
ンサーや走行路面の凹凸を検知する超音波検知器を用い
た各種計測器が商品化されている。超音波を用いて距離
を計測する場合、バースト状の一定出力音圧の超音波を
測距対象に発射し、その対象からの反射波を受信してそ
の伝播時間を計測して距離を計測する方法が一般的であ
る。
2. Description of the Related Art Conventionally, various measuring devices using a distance sensor using ultrasonic waves, a sensor attached to a moving body to detect the distance from the periphery of the moving body, or an ultrasonic detector to detect irregularities on a traveling road surface have been available. It has been commercialized. When measuring distance using ultrasonic waves, burst-type ultrasonic waves with a constant output sound pressure are emitted to the distance measurement target, the reflected wave from the target is received, and its propagation time is measured to measure the distance. The method is common.

【0003】また、超音波の発射の周期は測定距離によ
らず一定であるのが一般的である。
Further, the ultrasonic wave emission period is generally constant regardless of the measurement distance.

【0004】[0004]

【発明が解決しようとする課題】従来の超音波距離測定
装置においては、次のような課題を有していた。
The conventional ultrasonic distance measuring device has the following problems.

【0005】(1)移動体、例えば、自動車に取り付け
る超音波距離センサは、屋外で使用され、距離測定対象
は、自動車、2輪車、人、ペット等の動物、建築物と様
々である。また、10m以上の距離を計測するには、高出
力の超音波を出力する必要がある。そのため、人が非常
に近い距離で高出力の超音波を受ける場合が想定され
る。生物が高出力の超音波を受け続けることは望ましく
なく、周波数によっては高出力の超音波を受け続けると
気分が悪くなる場合のあることが文献に報告されてい
る。
(1) An ultrasonic distance sensor attached to a moving body, for example, an automobile is used outdoors, and various distance measurement targets include automobiles, two-wheeled vehicles, people, animals such as pets, and buildings. Moreover, in order to measure a distance of 10 m or more, it is necessary to output high-power ultrasonic waves. Therefore, it is assumed that a person receives a high-power ultrasonic wave at a very short distance. It has been reported in the literature that it is not desirable for an organism to continue to receive high-power ultrasonic waves, and depending on the frequency, it may be unpleasant if it continues to receive high-power ultrasonic waves.

【0006】本発明は人間や動物が近い距離で高出力の
超音波を受け続ける機会を減少させることを第一の課題
とする。
[0006] A first object of the present invention is to reduce the chance that a human or animal will continue to receive high-power ultrasonic waves at a short distance.

【0007】(2)また、超音波パルスを送信する周期
が一定にすると、その周期は最大測定距離を超音波が往
復する時間以上に設定する必要がある。その時、近距離
の対象の距離を計測すると受信波は早く受信器に到達す
るため、送信周期の多くの部分が距離計測に不必要な時
間となる。
(2) Further, if the cycle of transmitting the ultrasonic pulse is constant, it is necessary to set the maximum measurement distance to be equal to or longer than the time required for the ultrasonic wave to make a round trip. At that time, when the distance of a short-distance target is measured, the received wave arrives at the receiver earlier, and therefore a large part of the transmission cycle becomes unnecessary time for distance measurement.

【0008】ここでは測定距離に応じて送信周期最適に
し、測距の信頼性を向上させることを課題とする。
An object of the present invention is to optimize the transmission cycle according to the measurement distance and improve the reliability of distance measurement.

【0009】[0009]

【課題を解決するための手段】上記課題を解決するため
の本願発明の超音波距離測定装置は、超音波パルスを送
波し、物体からの反射波を受信して、その物体までの距
離を検知する超音波距離測定装置において、測距対象に
超音波を送信する送信器と前記送信器に駆動電圧を出力
し、かつ増幅度が可変なゲイン可変増幅器とバースト状
の信号を出力する発振器と前記測距対象からの反射波を
受信する受信器と、その信号を増幅する受信回路と、前
記発振器に発振のトリガ信号を出力し、前記ゲイン可変
増幅器にゲインを決定するゲイン指令信号を与え、送信
から受信するまでの時間を計測し、その距離を算出する
信号処理回路を備え、前記信号処理回路において、測距
対象からの距離に応じて、前記ゲイン指令信号を変化さ
せ、送信する超音波の音圧を変化させるものである。
An ultrasonic distance measuring apparatus of the present invention for solving the above-mentioned problems transmits an ultrasonic pulse, receives a reflected wave from an object, and measures the distance to the object. In the ultrasonic distance measuring device for detecting, a transmitter for transmitting ultrasonic waves to the object to be measured, a driving voltage output to the transmitter, and a variable gain amplifier with variable amplification degree and an oscillator for outputting a burst signal. A receiver for receiving a reflected wave from the object to be measured, a receiving circuit for amplifying the signal, a trigger signal for oscillation output to the oscillator, and a gain command signal for determining a gain to the variable gain amplifier, An ultrasonic wave to be transmitted by measuring the time from transmission to reception and including a signal processing circuit for calculating the distance, and changing the gain command signal in accordance with the distance from the object to be measured in the signal processing circuit. It is intended to change the sound pressure.

【0010】あるいは、超音波パルスを送波し、物体か
らの反射波を受信して、その物体までの距離を検知する
超音波距離測定装置において、測距対象に超音波を送信
する送信器と前記送信器に駆動電圧を出力し、かつ増幅
度が可変なゲイン可変増幅器とバースト状の信号を出力
する発振器と前記測距対象からの反射波を受信する受信
器と、その信号を増幅する受信回路と、前記発振器に発
振のトリガ信号を出力し、前記ゲイン可変増幅器にゲイ
ンを決定するゲイン指令信号を与え、送信から受信する
までの時間を計測し、その距離を算出する信号処理回路
を備え、前記信号処理回路において計測した受信音圧の
最大値の大きさに応じて、前記ゲイン指令信号を変化さ
せ、送信する超音波の音圧を変化させるものである。
Alternatively, in an ultrasonic distance measuring device that transmits an ultrasonic pulse, receives a reflected wave from an object, and detects the distance to the object, a transmitter that transmits the ultrasonic wave to a distance measurement target. A gain variable amplifier that outputs a drive voltage to the transmitter and that has a variable amplification degree, an oscillator that outputs a burst signal, a receiver that receives a reflected wave from the object to be measured, and a receiver that amplifies the signal A circuit and a signal processing circuit that outputs an oscillation trigger signal to the oscillator, applies a gain command signal that determines the gain to the variable gain amplifier, measures the time from transmission to reception, and calculates the distance The gain command signal is changed in accordance with the maximum value of the received sound pressure measured by the signal processing circuit to change the sound pressure of ultrasonic waves to be transmitted.

【0011】あるいは、超音波パルスを送波し、物体か
らの反射波を受信して、その物体までの距離を検知する
超音波距離測定装置において、測距対象に超音波を送信
する送信器と前記送信器に駆動電圧を出力する可変増幅
器とバースト状の信号を出力する発振器と前記測距対象
からの反射波を受信する受信器と、その信号を増幅する
受信回路と、前記発振器に発振のトリガ信号を出力し、
前記ゲイン可変増幅器にゲインを決定するゲイン指令信
号を与え、送信から受信するまでの時間を計測し、その
距離を算出する信号処理回路を備え、超音波の送信周期
を計測した距離に応じて変化させるものである。
Alternatively, in an ultrasonic distance measuring device that transmits an ultrasonic pulse, receives a reflected wave from an object, and detects the distance to the object, a transmitter that transmits the ultrasonic wave to a distance measurement target. A variable amplifier that outputs a drive voltage to the transmitter, an oscillator that outputs a burst signal, a receiver that receives a reflected wave from the object to be measured, a receiving circuit that amplifies the signal, and an oscillator that oscillates to the oscillator. Output the trigger signal,
A gain command signal that determines the gain is given to the variable gain amplifier, a signal processing circuit that measures the time from transmission to reception and calculates the distance, and changes the ultrasonic wave transmission cycle according to the measured distance It is what makes me.

【0012】[0012]

【作用】上記の手段によれば、超音波による距離測定結
果が小さい時には、その物体が受ける超音波の出力音圧
を小さくする。
According to the above means, when the distance measurement result by the ultrasonic wave is small, the output sound pressure of the ultrasonic wave received by the object is reduced.

【0013】一方、距離測定結果が大きい時には近くに
は物体が存在せず、超音波の往復距離が大きいため、超
音波の出力音圧を大きくする。
On the other hand, when the distance measurement result is large, there is no object nearby and the ultrasonic wave has a large round trip distance, so the output sound pressure of the ultrasonic wave is increased.

【0014】その結果、人間や動物が超音波送信器の近
づくと超音波による測定距離が次第に小さくなり、測定
距離減少に伴って、送信出力を小さくするため、人間や
動物が近くで大出力の超音波を受ける機会が大幅に減少
する。
As a result, when a human or an animal approaches the ultrasonic transmitter, the distance measured by the ultrasonic wave gradually decreases. As the measuring distance decreases, the transmission output is reduced, so that the human or the animal has a large output nearby. The chance of receiving ultrasound is greatly reduced.

【0015】また、測定距離に応じて、送信周期を変化
させることにより、近くの対象については、送信周期が
短くでき、その結果近くの測距対象ほど頻繁に距離計測
が可能になる。
Further, by changing the transmission cycle in accordance with the measured distance, the transmission cycle can be shortened for the near object, and as a result, the closer the object to be measured, the more frequently the distance can be measured.

【0016】[0016]

【実施例】以下、本発明の詳細について実施例とともに
説明する。図1は本発明の第一の実施例の構成を示すも
のである。
EXAMPLES Details of the present invention will be described below with reference to examples. FIG. 1 shows the configuration of the first embodiment of the present invention.

【0017】1は送信器、2はゲイン可変増幅器、3は
発振器、4は受信器、5は受信回路、6は信号処理回
路、7計測の対象となる物体である。
1 is a transmitter, 2 is a variable gain amplifier, 3 is an oscillator, 4 is a receiver, 5 is a receiving circuit, 6 is a signal processing circuit, and 7 is an object to be measured.

【0018】距離の計測時においては、信号処理回路6
より発振器3に発振トリガ101を与え、発振器6はゲイ
ン可変アンプ2に数10波の一定振幅の正弦波信号103を
出力する。
When measuring the distance, the signal processing circuit 6
The oscillation trigger 101 is applied to the oscillator 3, and the oscillator 6 outputs to the variable gain amplifier 2 a sine wave signal 103 having a constant amplitude of several tens of waves.

【0019】信号処理回路6はゲイン指令信号102をゲ
イン可変アンプ103に出力しておき、数10波の正弦波信
号103は指令されたゲインだけ増幅されて送信器駆動信
号105となり、送信器1を駆動して、送信超音波8を出
力する。
The signal processing circuit 6 outputs the gain command signal 102 to the variable gain amplifier 103, and the sine wave signal 103 of several tens of waves is amplified by the commanded gain to become the transmitter drive signal 105, and the transmitter 1 To transmit the transmitted ultrasonic wave 8.

【0020】送信超音波8は測距対象7で反射し、反射
波9となって受信器4で受信される。受信された反射波
9は受信回路5で増幅、検波され、信号処理回路6に入
力される。
The transmitted ultrasonic wave 8 is reflected by the object 7 to be measured and becomes a reflected wave 9 which is received by the receiver 4. The received reflected wave 9 is amplified and detected by the receiving circuit 5 and input to the signal processing circuit 6.

【0021】信号処理回路内部では発振トリガを出力し
てから、所定値以上の受信波を受け取るまでの時間を計
測する。この時間に音速を掛け、2で割ると計測の対象
7までの距離Lが算出される。この処理は例えば、A/D
コンバータ、D/Aコンバータやマイクロプロセッサを備
えた回路とソフトウエアによって実現できる。
Inside the signal processing circuit, the time from the output of the oscillation trigger to the reception of the received wave of a predetermined value or more is measured. By multiplying this time by the sound velocity and dividing by 2, the distance L to the measurement target 7 is calculated. This process is, for example, A / D
It can be realized by circuits and software equipped with converters, D / A converters, and microprocessors.

【0022】図2に送信トリガ出力後に反射波を受けた
ときの受信波の一例を示す。この時、図3に示すよう
に、測定距離Lに応じて、ゲイン指令信号102を変化さ
せる。
FIG. 2 shows an example of the received wave when the reflected wave is received after the transmission trigger is output. At this time, as shown in FIG. 3, the gain command signal 102 is changed according to the measurement distance L.

【0023】このようにすると近距離に物体がある時に
は、ゲイン可変アンプのゲインが低くなり、送信器駆動
信号105の振幅は小さくなり、送信器1から出力される
超音波は小さくなる。
In this way, when there is an object at a short distance, the gain of the variable gain amplifier becomes low, the amplitude of the transmitter drive signal 105 becomes small, and the ultrasonic wave output from the transmitter 1 becomes small.

【0024】一方、測定距離が大きい時は、ゲイン指令
信号102は大きく設定され、送信器駆動信号105の振幅は
大きくなり、送信器1から出力される超音波は大きくな
る。
On the other hand, when the measurement distance is large, the gain command signal 102 is set large, the amplitude of the transmitter drive signal 105 is large, and the ultrasonic wave output from the transmitter 1 is large.

【0025】この結果、対象が遠い距離から比較的近い
距離に近づいた時、最初には大出力の超音波を対象が受
けることは有り得るが、測定距離が小さくなると、次の
距離計測時には超音波の出力が下がり、近距離で人間や
動物が高出力の超音波を受け続けることを回避すること
ができる。
As a result, when the object approaches a relatively short distance from a far distance, the object may receive a high-power ultrasonic wave at first, but if the measurement distance becomes short, the ultrasonic wave will be measured at the next distance measurement. It is possible to avoid that humans and animals continue to receive high-power ultrasonic waves at a short distance because the output power of the power source decreases.

【0026】図4は第2の実施例の信号処理回路内で、
ゲイン指令信号を予め設定しておいた受信音圧設定値と
観測された受信音圧の最大値との差によってゲイン指令
信号106を決定することを示す図である。その他の機能
は前述の第一の実施例と同じであるので省略する。
FIG. 4 shows in the signal processing circuit of the second embodiment,
FIG. 6 is a diagram showing that the gain command signal 106 is determined based on the difference between the received sound pressure set value in which the gain command signal is preset and the maximum value of the observed received sound pressure. The other functions are the same as those in the first embodiment described above, and will be omitted.

【0027】受信音圧の最大値が受信音圧設定値より小
さい時には、図4に従い、ゲインを大きくして、次の送
信時の音圧を大きくし、受信音圧が前回の計測時より大
きくなるようにする。
When the maximum value of the received sound pressure is smaller than the set value of the received sound pressure, the gain is increased according to FIG. 4 to increase the sound pressure at the next transmission, and the received sound pressure is larger than that at the previous measurement. To be

【0028】逆に受信音圧の最大値が受信音圧設定値よ
り大きいには、図4に従い、ゲイン指令信号102を小さ
くして、次の送信時の音圧を小さくし、受信音圧が前回
の計測時より小さくなるようにする。
On the contrary, in order to make the maximum value of the received sound pressure larger than the set value of the received sound pressure, the gain command signal 102 is decreased according to FIG. Make it smaller than the previous measurement.

【0029】このようにして、受信される音圧の大きさ
が所定値に近づくようにゲイン指令信号106を変化させ
る。なお、本実施例では、駆動信号が大きすぎたり、計
測不可能になるほどに送信音圧が小さくなり過ぎないよ
うにするため、ゲイン指令信号にリミッタを設けてい
る。
In this way, the gain command signal 106 is changed so that the magnitude of the received sound pressure approaches the predetermined value. In this embodiment, a limiter is provided for the gain command signal in order to prevent the drive signal from becoming too large or the transmitted sound pressure from becoming too small so that measurement becomes impossible.

【0030】このように構成することにより、人間が送
信器近くにいる時に大出力の超音波受けると、反射波が
受信音圧設定値よりも大きくなり、その結果、次の距離
計測時には超音波の出力が下がり、近距離で人間や動物
が高出力の超音波を受け続けることを回避することがで
きる。
With this configuration, when a person receives a high-power ultrasonic wave while the person is near the transmitter, the reflected wave becomes larger than the received sound pressure set value, and as a result, the ultrasonic wave is measured at the next distance measurement. It is possible to avoid that humans and animals continue to receive high-power ultrasonic waves at a short distance because the output power of the power source decreases.

【0031】図5は第3の実施例における、送信周期と
測定距離の関係を示すグラフである。実線は本実施例で
用いた測定距離に応じた送信周期の設定の一例であり、
点線は測定距離を超音波が往復するために必要な時間で
ある。
FIG. 5 is a graph showing the relationship between the transmission period and the measured distance in the third embodiment. The solid line is an example of the setting of the transmission cycle according to the measurement distance used in this example,
The dotted line is the time required for the ultrasonic waves to travel back and forth over the measurement distance.

【0032】一例として往復に必要な時間に一定の時間
を加算したものを送信周期とすると、測定距離に応じ
た、最適な送信周期で距離測定が行われる。つまり、近
距離の測定で短い送信周期で測距が頻繁に行われ、長い
距離の測定はその距離に応じた必要最短時間の送信周期
で計測が行える。
As an example, if a transmission cycle is a sum of a time required for a round trip and a fixed time, the distance is measured at an optimum transmission cycle according to the measured distance. That is, distance measurement is frequently performed with a short transmission cycle in short-distance measurement, and long-distance measurement can be performed with a necessary minimum time transmission cycle according to the distance.

【0033】[0033]

【発明の効果】以上述べた様に、本願発明によれば、超
音波による測定距離または、受信音圧の最大値と受信音
圧所定値との誤差によって、送信器の駆動電圧を出力す
る増幅器のゲイン指令信号を変化させ、送信器の近くに
ある測距対象にある時には超音波出力が小さくなり、近
距離で人間や動物が高出力の超音波を受け続けることを
回避することができ、その実用的な効果はきわめて大き
い。
As described above, according to the present invention, an amplifier which outputs a drive voltage of a transmitter depending on a distance measured by ultrasonic waves or an error between a maximum value of received sound pressure and a predetermined value of received sound pressure. Change the gain command signal of, the ultrasonic output becomes small when it is in the distance measurement object near the transmitter, it is possible to avoid that humans and animals continue to receive high output ultrasonic waves at a short distance, Its practical effect is extremely large.

【0034】あるいは測距対象までの距離に応じて、で
きる限り頻繁に測距が行えるという利点があり、その実
用的効果は大きい。
Alternatively, there is an advantage that the distance can be measured as frequently as possible according to the distance to the object to be measured, and its practical effect is great.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第一の実施例の構成図FIG. 1 is a configuration diagram of a first embodiment of the present invention.

【図2】同実施例における、受信された反射波の音圧波
形図
FIG. 2 is a sound pressure waveform diagram of a received reflected wave in the example.

【図3】同実施例におけるゲイン指令信号図FIG. 3 is a gain command signal diagram in the embodiment.

【図4】本発明の第二の実施例における、ゲイン指令電
圧の設定の説明図
FIG. 4 is an explanatory diagram of setting of a gain command voltage in the second embodiment of the present invention.

【図5】本発明の第三の実施例における、測定距離と送
信周期との説明図
FIG. 5 is an explanatory diagram of a measurement distance and a transmission cycle according to the third embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 送信器 2 ゲイン可変増幅器 3 発振器 4 受信器 5 受信回路 6 信号処理回路 7 測定対象 8 送信超音波 9 反射波 101 発振トリガ 102 ゲイン指令信号 103 正弦波信号 105 送信器駆動信号 1 transmitter 2 variable gain amplifier 3 oscillator 4 receiver 5 receiving circuit 6 signal processing circuit 7 measurement target 8 transmitted ultrasonic wave 9 reflected wave 101 oscillation trigger 102 gain command signal 103 sine wave signal 105 transmitter drive signal

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】超音波パルスを送波し、測定対象からの反
射波を受信して、前記測定対象までの距離を検知する超
音波距離測定装置において、測距対象に超音波を送信す
る送信器と、前記送信器に駆動電圧を出力しかつ増幅度
が可変なゲイン可変増幅器と、バースト状の信号を出力
する発振器と、前記測距対象からの反射波を受信する受
信器と、その信号を増幅する受信回路と、前記発振器に
発振のトリガ信号を出力し、前記ゲイン可変増幅器にゲ
インを決定するゲイン指令信号を与え、送信から受信す
るまでの時間を計測し、その距離を算出する信号処理回
路を備え、前記信号処理回路は、計測した測距対象から
の距離に応じて、送信する超音波の音圧を変化させるゲ
イン指令信号を前記ゲイン可変増幅器に出力することを
特徴とする超音波距離測定装置。
1. An ultrasonic distance measuring device that transmits an ultrasonic pulse, receives a reflected wave from a measurement target, and detects a distance to the measurement target, and transmits ultrasonic waves to the distance measurement target. , A variable gain amplifier that outputs a driving voltage to the transmitter and has a variable amplification degree, an oscillator that outputs a burst signal, a receiver that receives a reflected wave from the object to be measured, and its signal A signal that outputs a trigger signal for oscillation to the oscillator and a gain command signal that determines the gain to the variable gain amplifier, measures the time from transmission to reception, and calculates the distance. And a processing circuit, wherein the signal processing circuit outputs a gain command signal for changing the sound pressure of ultrasonic waves to be transmitted to the gain variable amplifier, according to the measured distance from the object to be measured. Sound wave Away measurement device.
【請求項2】測定距離が小さい時ほど前記送信する超音
波の音圧は小さく、測定距離が大きい時ほど超音波の音
圧を大きくなるようなゲイン指令信号が、信号処理回路
よりゲイン可変増幅器に出力されることを特徴とする請
求項1記載の超音波距離測定装置。
2. A variable gain amplifier which outputs a gain command signal from a signal processing circuit, such that the sound pressure of the ultrasonic wave to be transmitted is smaller as the measurement distance is smaller, and the sound pressure of the ultrasonic wave is larger as the measurement distance is larger. The ultrasonic distance measuring device according to claim 1, wherein the ultrasonic distance measuring device is output.
【請求項3】超音波パルスを送波し、測定対象からの反
射波を受信して、前記測定対象までの距離を検知する超
音波距離測定装置において、測距対象に超音波を送信す
る送信器と、前記送信器に駆動電圧を出力し、かつ増幅
度が可変なゲイン可変増幅器と、バースト状の信号を出
力する発振器と、前記測距対象からの反射波を受信する
受信器と、その信号を増幅する受信回路と、前記発振器
に発振のトリガ信号を出力し、前記ゲイン可変増幅器に
ゲインを決定するゲイン指令信号を与え、送信から受信
するまでの時間を計測し、その距離を算出する信号処理
回路を備え、前記信号処理回路は、計測した受信音圧の
最大値の大きさに応じて、送信する超音波の音圧を変化
させるゲイン指令信号を前記ゲイン可変増幅器に出力す
ることを特徴とする超音波距離測定装置。
3. An ultrasonic distance measuring device that transmits an ultrasonic pulse, receives a reflected wave from a measurement target, and detects a distance to the measurement target, and transmits ultrasonic waves to the distance measurement target. A variable gain amplifier that outputs a driving voltage to the transmitter and has a variable amplification degree, an oscillator that outputs a burst signal, and a receiver that receives a reflected wave from the object to be measured, A reception circuit that amplifies a signal and an oscillation trigger signal are output to the oscillator, a gain command signal that determines the gain is given to the gain variable amplifier, the time from transmission to reception is measured, and the distance is calculated. A signal processing circuit, wherein the signal processing circuit outputs a gain command signal for changing the sound pressure of ultrasonic waves to be transmitted to the gain variable amplifier according to the magnitude of the maximum value of the received sound pressure measured. Features Ultrasonic distance measuring device.
【請求項4】受信音圧所定値と前記受信音圧の最大値と
の差に比例させて、ゲイン指令信号を与えることを特徴
とする請求項3記載の超音波距離測定装置。
4. The ultrasonic distance measuring device according to claim 3, wherein the gain command signal is given in proportion to the difference between the predetermined value of the received sound pressure and the maximum value of the received sound pressure.
【請求項5】超音波パルスを送波し、測定対象からの反
射波を受信して、前記測定対象までの距離を検知する超
音波距離測定装置において、測距対象に超音波を送信す
る送信器と前記送信器に駆動電圧を出力する可変増幅器
とバースト状の信号を出力する発振器と前記測距対象か
らの反射波を受信する受信器と、その信号を増幅する受
信回路と、前記発振器に発振のトリガ信号を出力し、前
記ゲイン可変増幅器にゲインを決定するゲイン指令信号
を与え、送信から受信するまでの時間を計測し、その距
離を算出する信号処理回路を備え、超音波の送信周期を
計測した距離に応じて変化させることを特徴とする超音
波距離測定装置。
5. An ultrasonic distance measuring device that transmits an ultrasonic pulse, receives a reflected wave from a measurement target, and detects a distance to the measurement target, and transmits ultrasonic waves to the distance measurement target. Amplifier, a variable amplifier that outputs a drive voltage to the transmitter, an oscillator that outputs a burst-shaped signal, a receiver that receives a reflected wave from the target object, a receiving circuit that amplifies the signal, and the oscillator. An oscillation trigger signal is output, a gain command signal that determines the gain is given to the variable gain amplifier, the time from transmission to reception is measured, and a signal processing circuit that calculates the distance is provided. An ultrasonic distance measuring device characterized in that it changes according to the measured distance.
【請求項6】測定距離が小さい時ほど前記送信周期を小
さくし、測定距離が大きい時ほど前記送信周期を大きく
することを特徴とする請求項5記載の超音波距離測定装
置。
6. The ultrasonic distance measuring apparatus according to claim 5, wherein the transmission cycle is decreased as the measurement distance is smaller, and the transmission cycle is increased as the measurement distance is larger.
JP6073199A 1994-04-12 1994-04-12 Ultrasonic distance-measuring apparatus Granted JPH07280932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6073199A JPH07280932A (en) 1994-04-12 1994-04-12 Ultrasonic distance-measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6073199A JPH07280932A (en) 1994-04-12 1994-04-12 Ultrasonic distance-measuring apparatus

Publications (1)

Publication Number Publication Date
JPH07280932A true JPH07280932A (en) 1995-10-27

Family

ID=13511246

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6073199A Granted JPH07280932A (en) 1994-04-12 1994-04-12 Ultrasonic distance-measuring apparatus

Country Status (1)

Country Link
JP (1) JPH07280932A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004085214A (en) * 2002-08-22 2004-03-18 Nissan Motor Co Ltd Apparatus for detecting parking space
WO2005031258A1 (en) * 2003-09-18 2005-04-07 Tzuihu Lee Pulsewave reflection oscillation device for ranging and its method
WO2015136858A1 (en) * 2014-03-11 2015-09-17 パナソニックIpマネジメント株式会社 Object detection apparatus
WO2021129871A1 (en) * 2019-12-27 2021-07-01 Chia Hung Chen Device and system for determining property of object

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004085214A (en) * 2002-08-22 2004-03-18 Nissan Motor Co Ltd Apparatus for detecting parking space
WO2005031258A1 (en) * 2003-09-18 2005-04-07 Tzuihu Lee Pulsewave reflection oscillation device for ranging and its method
WO2015136858A1 (en) * 2014-03-11 2015-09-17 パナソニックIpマネジメント株式会社 Object detection apparatus
JP2015172503A (en) * 2014-03-11 2015-10-01 パナソニックIpマネジメント株式会社 Object detector
WO2021129871A1 (en) * 2019-12-27 2021-07-01 Chia Hung Chen Device and system for determining property of object

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