JPH10160614A - Acoustic leak location identification device - Google Patents
Acoustic leak location identification deviceInfo
- Publication number
- JPH10160614A JPH10160614A JP31536196A JP31536196A JPH10160614A JP H10160614 A JPH10160614 A JP H10160614A JP 31536196 A JP31536196 A JP 31536196A JP 31536196 A JP31536196 A JP 31536196A JP H10160614 A JPH10160614 A JP H10160614A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- sound wave
- measuring means
- wave measuring
- microphone
- 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.)
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- Examining Or Testing Airtightness (AREA)
- Complex Calculations (AREA)
Abstract
(57)【要約】
【課題】 複雑な構成を必要とせずにマイク間の距離を
正確に測定することができ、正確に配管の漏洩位置を特
定することができる音響式漏洩位置特定装置を提供する
ことである。
【解決手段】 配管１の両端に設けられて漏洩位置から
の漏洩音を測定するマイク２、３と、このマイク２、３
で得た２つの音波信号に相互相関法を適用して求めた漏
洩音の伝搬時間差、およびマイク２からマイク３までの
マイク間距離に基づいて、配管１のうちマイク２とマイ
ク３との間における漏洩位置を特定する信号処理部１０
とを備えた音響式漏洩位置特定装置において、配管１の
うちマイク２およびマイク３よりも外側にスピーカ４を
設けるとともに、このスピーカ４からの音をマイク２、
３で測定し、信号処理部１０によって、スピーカ４から
の音をマイク２、３で得た２つの音波信号に相互相関法
を適用することによってマイク間距離を演算する。
(57) [Summary] [Problem] To provide an acoustic leak position specifying device that can accurately measure the distance between microphones without requiring a complicated configuration and can accurately specify a leak position of a pipe. It is to be. SOLUTION: Microphones 2 and 3 provided at both ends of a pipe 1 for measuring a leakage sound from a leakage position, and microphones 2 and 3
Between the microphone 2 and the microphone 3 in the pipe 1 based on the propagation time difference of the leaked sound obtained by applying the cross-correlation method to the two sound signals obtained in the above, and the distance between the microphones from the microphone 2 to the microphone 3 Processing unit 10 for specifying the leakage position in
In the acoustic-type leak position specifying device provided with the above, a speaker 4 is provided outside the microphone 2 and the microphone 3 in the pipe 1, and the sound from the speaker 4 is
3 and the signal processing unit 10 calculates the distance between the microphones by applying the cross-correlation method to the two sound signals obtained from the microphones 2 and 3 by the signal processing unit 10.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は音響式漏洩位置特定
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic leak position specifying device.
【０００２】[0002]
【従来の技術】ガスや水道等の土中埋設配管は腐食等に
よって穴が空き、管内の輸送対象物が漏洩してしまうこ
とがある。このような場合、漏洩位置を精度よく特定
し、その漏洩位置だけを掘り起こして修理するのが望ま
しい。2. Description of the Related Art Pipings buried in soil, such as gas and water, have holes due to corrosion or the like, and objects to be transported inside the pipes may leak. In such a case, it is desirable to specify the leak position with high accuracy and to dig up and repair only the leak position.
【０００３】従来から、配管の漏洩位置を特定する方法
として音響式の配管漏洩位置特定方法が知られている。
たとえば、特開平５−８７６６９号公報に開示された配
管漏洩検査方法は、水、油等を輸送する配管における漏
洩位置を特定する方法であり、この方法は、配管上の２
点で音圧を検出し、この２点で得た音圧の信号を相互相
関法にて処理することによって２点に漏洩音が伝わるま
での伝搬時間の差を求め、この伝搬時間の差に基づいて
漏洩位置を特定する方法である。Hitherto, as a method for specifying a leak position of a pipe, an acoustic pipe leak position specifying method has been known.
For example, a pipe leak inspection method disclosed in Japanese Patent Application Laid-Open No. Hei 5-87669 is a method of specifying a leak position in a pipe for transporting water, oil, and the like.
A sound pressure is detected at a point, and a signal of the sound pressure obtained at the two points is processed by a cross-correlation method to obtain a difference in propagation time until the leaked sound is transmitted to the two points. This is a method of specifying a leakage position based on the information.
【０００４】たとえば、図２を参照すると、配管１上の
任意の２点（点Ａと点Ｂ）に音波測定手段としてのマイ
ク２およびマイク３を取り付け、このマイク２、３によ
って点Ｃの漏洩位置からの漏洩音を測定する。そして、
マイク２で得た音波信号とマイク３で得た音波信号とを
相互相関法にて処理することによって２点に漏洩音が伝
わるまでの伝搬時間の差を求め、この伝搬時間の差に基
づいて漏洩位置である点Ｃを特定することができる。For example, referring to FIG. 2, a microphone 2 and a microphone 3 as sound wave measuring means are attached to arbitrary two points (point A and point B) on a pipe 1, and the microphone 2 and 3 leak the point C. Measure the sound leakage from the location. And
By processing the sound wave signal obtained by the microphone 2 and the sound wave signal obtained by the microphone 3 by the cross-correlation method, a difference in propagation time until the leaked sound is transmitted to two points is obtained, and based on the difference in the propagation time. Point C, which is the leak position, can be specified.
【０００５】所定の時間ｔにおけるマイク２で得た音波
信号ｆ1 （ｔ）およびマイク３で得た音波信号ｆ2
（ｔ）は、たとえば数１のように近似することができ
る。At a predetermined time t, a sound wave signal f 1 (t) obtained by the microphone 2 and a sound wave signal f 2 obtained by the microphone 3
(T) can be approximated, for example, as in Equation 1.
【０００６】[0006]
【数１】 数１において、Ｇ1 は漏洩音が漏洩位置からマイク２に
到達する際のゲインであり、Ｇ2 は漏洩音が漏洩位置か
らマイク３に到達する際のゲインであり、Ｒ（ｔ）は所
定の時間ｔにおける漏洩位置における漏洩音波信号であ
り、ｔ1 は漏洩音が漏洩位置からマイク２に到達するの
にかかる時間であり、ｔ2 は漏洩音が漏洩位置からマイ
ク３に到達するのにかかる時間である。(Equation 1) In Equation 1, G 1 is the gain when the leaked sound reaches the microphone 2 from the leak position, G 2 is the gain when the leaked sound reaches the microphone 3 from the leak position, and R (t) is a predetermined value. a leakage wave signal at the leakage location at time t, t 1 is the time it takes to reach the leakage sound leakage position the microphone 2, to t 2 reaches the microphone 3 from leaking sound leakage position It is such a time.
【０００７】そして、マイク２で得た音波信号ｆ1
（ｔ）とマイク３で得た音波信号ｆ2 （ｔ）との相互相
関関数はγ12（τ）はたとえば数２で近似される。ただ
し、数２のγ12（τ）は正規化された相互相関関数であ
る。この正規化を行うことにより、波形の大きさによら
ない検出を行うことができるようになる。The sound wave signal f 1 obtained by the microphone 2
As for the cross-correlation function between (t) and the sound signal f 2 (t) obtained by the microphone 3, γ 12 (τ) is approximated by, for example, Expression 2. Here, γ 12 (τ) in Expression 2 is a normalized cross-correlation function. By performing this normalization, it becomes possible to perform detection independent of the size of the waveform.
【０００８】[0008]
【数２】 数２において、Ｔはｔ1 、ｔ2 や（ｔ1 ＋ｔ2 ）と比べ
て十分に大きな時間である。また、τは信号（ｔ）と信
号ｆ2 （ｔ）とをずらす時間差である。(Equation 2) In Equation 2, T is a sufficiently large time as compared with t 1 , t 2 or (t 1 + t 2 ). Τ is the time difference between the signal (t) and the signal f 2 (t).
【０００９】γ12（τ）がピークを示す時間差τは、時
間ｔ1 と時間ｔ2 との差である。これを用いて、さらに
マイク２からマイク３までのマイク間の距離がわかれ
ば、漏洩位置の特定を行うことができる。The time difference τ at which γ 12 (τ) has a peak is the difference between time t 1 and time t 2 . By using this, if the distance between the microphones from the microphone 2 to the microphone 3 is further known, the leakage position can be specified.
【００１０】[0010]
【発明が解決しようとする課題】ところが、従来は、マ
イク間の距離を、配管１を埋設する際の図面に基づいて
類推し求めていたため、正確な距離がわからず、従って
漏洩位置も正確に特定できないものであった。However, conventionally, the distance between the microphones was estimated by analogy based on the drawing when the pipe 1 was buried, so that the exact distance was not known, and therefore the leak position was also accurate. It could not be identified.
【００１１】また、マイク間の距離を正確に求めるため
に一般の測量技術を用いて距離測定を行うとすると、距
離測定のための機材が必要となり、構成が複雑になって
しまうし非効率であるという問題があった。Further, if distance measurement is performed using a general surveying technique in order to accurately determine the distance between microphones, equipment for distance measurement is required, which complicates the configuration and is inefficient. There was a problem.
【００１２】本発明は上記の点にかんがみてなされたも
ので、複雑な構成を必要とせずにマイク間の距離を正確
に測定することができ、正確に配管の漏洩位置を特定す
ることができる音響式漏洩位置特定装置を提供すること
を目的とする。The present invention has been made in view of the above circumstances, and can accurately measure a distance between microphones without requiring a complicated configuration, and can accurately specify a leak position of piping. It is an object of the present invention to provide an acoustic leak position specifying device.
【００１３】[0013]
【課題を解決するための手段】本発明は上記の目的を達
成するために、配管の両端に設けられて前記配管の漏洩
位置からの漏洩音を測定する第１および第２の音波測定
手段と、この第１および第２の音波測定手段で得た２つ
の音波信号に相互相関法を適用して求めた漏洩音の伝搬
時間差、および前記第１の音波測定手段から前記第２の
音波測定手段までの音波測定手段間距離に基づいて、前
記配管のうち前記第１の音波測定手段と前記第２の音波
測定手段との間における前記漏洩位置を特定する信号処
理部とを備えた音響式漏洩位置特定装置において、前記
配管のうち前記第１の音波測定手段および前記第２の音
波測定手段よりも外側に音源を設けるとともに、この音
源からの音を前記第１および第２の音波測定手段で測定
し、前記信号処理部によって、前記音源からの音を第１
および第２の音波測定手段で得た、２つの音波信号に相
互相関法を適用することによって前記音波測定手段間距
離を演算する音波測定手段間距離演算手段を設けたこと
を特徴とする。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides first and second sound wave measuring means provided at both ends of a pipe for measuring a leak sound from a leak position of the pipe. The difference between the propagation times of the leaked sound obtained by applying the cross-correlation method to the two sound wave signals obtained by the first and second sound wave measuring means, and from the first sound wave measuring means to the second sound wave measuring means. And a signal processing unit for specifying the leakage position between the first sound wave measuring means and the second sound wave measuring means in the pipe based on the distance between the sound wave measuring means up to In the position specifying device, a sound source is provided outside the first sound wave measuring means and the second sound wave measuring means in the pipe, and the sound from this sound source is sent to the first and second sound wave measuring means. Measure and process the signal Accordingly, the sound from the sound source first
And a sound wave measuring means distance calculating means for calculating the sound wave measuring means distance by applying a cross-correlation method to two sound wave signals obtained by the second sound wave measuring means.
【００１４】[0014]
【発明の実施の形態】以下本発明を図面に基づいて説明
する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
【００１５】図１は、本発明による音響式漏洩位置特定
装置の一実施の形態のブロック図である。FIG. 1 is a block diagram of an embodiment of an acoustic leak position specifying device according to the present invention.
【００１６】本実施の形態では、図１に示すように、配
管１のマイク２および３よりも外側にスピーカ４を設け
（図１ではマイク２側にスピーカ４を設けているが、マ
イク３側であってもよい）、このスピーカ４によって、
配管１内においてたとえば帯域を制限したＭ系列等のラ
ンダムノイズ発振またはＯＮ／ＯＦＦによる発信が行わ
れる。In the present embodiment, as shown in FIG. 1, a speaker 4 is provided outside the microphones 2 and 3 of the pipe 1 (in FIG. 1, the speaker 4 is provided on the microphone 2 side, but the microphone 3 side is provided). ), The speaker 4
In the pipe 1, transmission by random noise oscillation or ON / OFF of, for example, an M-sequence with a limited band is performed.
【００１７】マイク２、３およびスピーカ４は、それぞ
れ無線機５、６および７に接続され、端末装置８と通信
を行う。マイク２、３はそれぞれが配管１内で得た音波
信号を無線機５、６を介して端末装置８に対して送信
し、スピーカ４は無線機７を介して端末装置８から受信
した指示に基づいて鳴動する。The microphones 2 and 3 and the speaker 4 are connected to radio units 5, 6 and 7, respectively, and communicate with a terminal device 8. The microphones 2 and 3 each transmit a sound wave signal obtained in the pipe 1 to the terminal device 8 via the wireless devices 5 and 6, and the speaker 4 responds to an instruction received from the terminal device 8 via the wireless device 7. Ring based on.
【００１８】端末装置８は、マイク２、３およびスピー
カ４と送受信を行う送受信部９と、送受信部９で受信し
たマイク２、３で得た音波信号に基づいて信号処理を行
って漏洩位置の特定を行う信号処理部１０と、信号処理
部１０で特定した漏洩位置を表示する表示部１１とから
成る。The terminal device 8 transmits and receives signals to and from the microphones 2 and 3 and the speaker 4. The terminal device 8 performs signal processing based on the sound wave signals received by the microphones 2 and 3 received by the transmitter and receiver 9 to determine the leakage position. It comprises a signal processing unit 10 for specifying and a display unit 11 for displaying the leakage position specified by the signal processing unit 10.
【００１９】次に、本実施の形態の動作について説明す
る。Next, the operation of this embodiment will be described.
【００２０】まず、端末装置８は無線機７を介して指示
してスピーカ４を鳴動させる。このスピーカ音は漏洩音
と比べて大きな音であればよい。マイク２、３では、こ
のスピーカ音やその他配管１内の音を受けて得た音波信
号を無線機５、６を介して端末装置８に対して送信す
る。First, the terminal device 8 instructs the speaker 4 to sound through the wireless device 7. The speaker sound may be a loud sound as compared with the leak sound. The microphones 2 and 3 transmit a sound wave signal obtained by receiving the speaker sound and other sounds in the pipe 1 to the terminal device 8 via the wireless devices 5 and 6.
【００２１】送受信部９で受信した、マイク２で得た音
波信号およびマイク３で得た音波信号は、信号処理部１
０に引き渡され、信号処理部１０において相互相関法に
よって処理される。すなわち、マイク２で得た音波信号
をｆ1 （ｔ）とし、マイク３で得た音波信号をｆ2
（ｔ）として、先に示した数２を適用し、相互相関関数
γ12（τ）がピークを示すときの時間差τを求める。こ
のτは、スピーカ４からのスピーカ音がマイク２に到達
するまでの時間とマイク３に到達するまでの時間との時
間差、すなわちスピーカ音がマイク２からマイク３に到
達する時間であり、音速は既知であるため、マイク２か
らマイク３までの距離を演算することができる。The sound wave signal obtained by the microphone 2 and the sound wave signal obtained by the microphone 3 received by the transmission / reception unit 9 are transmitted to the signal processing unit 1.
0 and is processed by the signal processing unit 10 by the cross-correlation method. That is, the sound wave signal obtained by the microphone 2 is f 1 (t), and the sound wave signal obtained by the microphone 3 is f 2 (t).
The time difference τ when the cross-correlation function γ 12 (τ) shows a peak is obtained by applying Equation 2 shown above as (t). This τ is a time difference between a time required for the speaker sound from the speaker 4 to reach the microphone 2 and a time required for reaching the microphone 3, that is, a time required for the speaker sound to reach the microphone 3 from the microphone 2. Since it is known, the distance from the microphone 2 to the microphone 3 can be calculated.
【００２２】このようにしてマイク２からマイク３まで
の距離を得たならば、次はスピーカ４によるスピーカ音
の出力を停止した上で、マイク２、３で得た音波信号の
採集を開始する。すなわち、マイク２、３では、漏洩音
等の配管１内の音を受けて得た音波信号を無線機５、６
を介して端末装置８に対して送信する。After the distance from the microphone 2 to the microphone 3 is obtained in this way, the output of the speaker sound from the speaker 4 is stopped, and then the collection of the sound wave signals obtained by the microphones 2 and 3 is started. . That is, the microphones 2 and 3 transmit sound signals obtained by receiving sounds in the pipe 1 such as leaked sounds to the wireless devices 5 and 6.
To the terminal device 8 via the.
【００２３】送受信部９で受信した、マイク２で得た音
波信号およびマイク３で得た音波信号は、信号処理部１
０に引き渡され、信号処理部１０において相互相関法に
よって処理される。すなわち、マイク２で得た音波信号
をｆ1 （ｔ）とし、マイク３で得た音波信号をｆ2
（ｔ）として、先に示した数２を適用し、相互相関関数
γ12（τ）がピークを示すときの時間差τを求める。こ
のτは、漏洩位置からの漏洩音がマイク２に到達するま
での時間とマイク３に到達するまでの時間との時間差で
ある。すでにマイク２からマイク３までの距離がわかっ
ているため、漏洩位置からの漏洩音がマイク２に到達す
るまでの時間とマイク３に到達するまでの時間との時間
差がわかれば、たとえばマイク２から漏洩位置までの距
離がわかり、漏洩位置を特定することができる。The sound wave signal obtained by the microphone 2 and the sound wave signal obtained by the microphone 3 received by the transmission / reception unit 9 are transmitted to the signal processing unit 1
0 and is processed by the signal processing unit 10 by the cross-correlation method. That is, the sound wave signal obtained by the microphone 2 is f 1 (t), and the sound wave signal obtained by the microphone 3 is f 2 (t).
The time difference τ when the cross-correlation function γ 12 (τ) shows a peak is obtained by applying Equation 2 shown above as (t). This τ is a time difference between the time required for the leaked sound from the leaked position to reach the microphone 2 and the time required for reaching the microphone 3. Since the distance from the microphone 2 to the microphone 3 is already known, if the time difference between the time required for the leaked sound from the leak position to reach the microphone 2 and the time required for the sound to reach the microphone 3 is known, for example, from the microphone 2 The distance to the leak position can be known, and the leak position can be specified.
【００２４】信号処理部１０では上述のようにして漏洩
位置を特定し、その特定した漏洩位置を表示部１１に表
示する。The signal processing unit 10 specifies the leak position as described above, and displays the specified leak position on the display unit 11.
【００２５】なお、本実施の形態ではスピーカ４を音源
として用いたが、本発明はこれに限らず、他の音源、発
音体を用いても構わない。In the present embodiment, the speaker 4 is used as a sound source. However, the present invention is not limited to this, and another sound source or sounding body may be used.
【００２６】また、本実施の形態ではマイク２、３およ
びスピーカ４と端末装置８との間を無線で接続したが、
これを有線で接続しても構わない。In this embodiment, the microphones 2 and 3 and the speaker 4 and the terminal device 8 are wirelessly connected.
This may be connected by wire.
【００２７】[0027]
【発明の効果】以上説明したように、本発明によれば、
複雑な構成を必要とせずにマイク間の距離を正確に測定
することができ、正確に配管の漏洩位置を特定すること
ができる音響式漏洩位置特定装置を提供することができ
る。すなわち、従来、実際に測定または配管図面から類
推することによって、２つのマイク間の距離を求めてお
り、不正確、非効率であったが、本発明によれば、スピ
ーカなどの音源等を追加するだけで、既存の信号処理方
式をそのまま利用して２つのマイク間の距離を求めるこ
とができる。As described above, according to the present invention,
It is possible to provide an acoustic leak position specifying device that can accurately measure a distance between microphones without requiring a complicated configuration and can accurately specify a leak position of a pipe. That is, conventionally, the distance between two microphones was obtained by actually measuring or inferring from a piping drawing, which was inaccurate and inefficient. However, according to the present invention, a sound source such as a speaker was added. By simply doing so, the distance between the two microphones can be obtained using the existing signal processing method as it is.
【図１】本発明による音響式漏洩位置特定装置の一実施
の形態のブロック図である。FIG. 1 is a block diagram of an embodiment of an acoustic leakage position identification device according to the present invention.
【図２】従来の音響式漏洩位置特定装置について説明す
る図である。FIG. 2 is a diagram illustrating a conventional acoustic leakage position identification device.
１ 配管 ２、３ マイク ４ スピーカ ５、６、７ 無線機 ８ 端末装置 ９ 送受信部 １０ 信号処理部 １１ 表示部 DESCRIPTION OF SYMBOLS 1 Piping 2, 3 Microphone 4 Speaker 5, 6, 7 Radio 8 Terminal equipment 9 Transceiver 10 Signal processing 11 Display
Claims (4)
位置からの漏洩音を測定する第１および第２の音波測定
手段と、該第１および第２の音波測定手段で得た２つの
音波信号に相互相関法を適用して求めた漏洩音の伝搬時
間差、および前記第１の音波測定手段から前記第２の音
波測定手段までの音波測定手段間距離に基づいて、前記
配管のうち前記第１の音波測定手段と前記第２の音波測
定手段との間における前記漏洩位置を特定する信号処理
部とを備えた音響式漏洩位置特定装置において、 前記配管のうち前記第１の音波測定手段および前記第２
の音波測定手段よりも外側に音源を設けるとともに、 該音源からの音を前記第１および第２の音波測定手段で
測定し、前記信号処理部によって、前記音源からの音を
第１および第２の音波測定手段で得た、２つの音波信号
に相互相関法を適用することによって前記音波測定手段
間距離を演算する音波測定手段間距離演算手段を設けた
ことを特徴とする音響式漏洩位置特定装置。1. A first and a second sound wave measuring means provided at both ends of a pipe for measuring a leak sound from a leak position of the pipe, and two sound wave measuring means obtained by the first and the second sound wave measuring means. The propagation time difference of the leaked sound obtained by applying the cross-correlation method to the sound wave signal, and the distance between the sound wave measuring means from the first sound wave measuring means to the second sound wave measuring means, In an acoustic leak position specifying device including a signal processing unit that specifies the leak position between a first sound wave measuring unit and the second sound wave measuring unit, the first sound wave measuring unit of the pipe And the second
A sound source is provided outside of the sound wave measuring means, and sound from the sound source is measured by the first and second sound wave measuring means, and the sound from the sound source is first and second by the signal processing unit. Acoustic leak position identification, characterized in that a sound wave measuring means distance calculating means for calculating a distance between sound wave measuring means by applying a cross-correlation method to two sound wave signals obtained by the sound wave measuring means is provided. apparatus.
よび第２の音波測定手段がマイクである請求項１に記載
の音響式漏洩位置特定装置。2. The acoustic leak position specifying device according to claim 1, wherein the sound source is a speaker, and the first and second sound wave measuring means are microphones.
の音波測定手段によって前記配管の漏洩位置からの漏洩
音を測定し、前記第１および第２の音波測定手段で得た
２つの音波信号に相互相関法を適用して求めた漏洩音の
伝搬時間差、および前記第１の音波測定手段から前記第
２の音波測定手段までの音波測定手段間距離に基づい
て、前記配管のうち前記第１の音波測定手段と前記第２
の音波測定手段との間における前記漏洩位置を特定する
音響式漏洩位置特定方法において、 前記配管のうち前記第１の音波測定手段および前記第２
の音波測定手段よりも外側に音源を設け、 該音源からの音を前記第１および第２の音波測定手段で
測定し、前記信号処理部によって、前記音源からの音を
第１および第２の音波測定手段で得た、２つの音波信号
に相互相関法を適用することによって前記音波測定手段
間距離を演算することを特徴とする音響式漏洩位置特定
方法。3. The first and second pipes provided at both ends of a pipe.
The sound propagation time difference of the leak sound obtained by measuring the leak sound from the leak position of the pipe by the sound wave measuring means and applying the cross-correlation method to the two sound signals obtained by the first and second sound wave measuring means. Based on the distance between the first sound wave measuring means and the second sound wave measuring means and from the first sound wave measuring means to the second sound wave measuring means.
In the acoustic leak position specifying method for specifying the leak position between the first sound wave measuring means and the second sound wave measuring means,
A sound source is provided outside of the sound wave measuring means, sound from the sound source is measured by the first and second sound wave measuring means, and the sound from the sound source is first and second by the signal processing unit. An acoustic leak position specifying method, wherein a distance between the sound wave measuring means is calculated by applying a cross-correlation method to two sound wave signals obtained by the sound wave measuring means.
よび第２の音波測定手段がマイクである請求項３に記載
の音響式漏洩位置特定方法。4. The method of claim 3, wherein the sound source is a speaker, and the first and second sound wave measuring means are microphones.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31536196A JPH10160614A (en) | 1996-11-27 | 1996-11-27 | Acoustic leak location identification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31536196A JPH10160614A (en) | 1996-11-27 | 1996-11-27 | Acoustic leak location identification device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10160614A true JPH10160614A (en) | 1998-06-19 |
Family
ID=18064495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31536196A Pending JPH10160614A (en) | 1996-11-27 | 1996-11-27 | Acoustic leak location identification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10160614A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292302A (en) * | 1999-02-01 | 2000-10-20 | Mitsubishi Electric Corp | Abnormal location detector |
| GB2378756A (en) * | 2001-07-16 | 2003-02-19 | Thames Water Utilities | Apparatus for detecting leaks in or determing the nature of a pipe. |
| JP2009047831A (en) * | 2007-08-17 | 2009-03-05 | Toshiba Corp | Feature amount extraction apparatus, program, and feature amount extraction method |
| KR101381469B1 (en) * | 2013-08-21 | 2014-04-04 | 한국원자력연구원 | A Method for Reducing Mechanical Noise of Cross-Correlation Method for Leak Detection of a Buried Pipe |
| CN105403369A (en) * | 2015-12-16 | 2016-03-16 | 深圳供电局有限公司 | Method and system for detecting gas tightness of GIS (gas insulated switchgear) |
| JP2021021665A (en) * | 2019-07-30 | 2021-02-18 | 吉佳エンジニアリング株式会社 | Leakage detection method and leakage detector |
| JP2022169884A (en) * | 2021-04-28 | 2022-11-10 | パナソニックＩｐマネジメント株式会社 | Water leakage detection system and ultrasonic flow meter used therefor |
| CN116658835A (en) * | 2023-05-22 | 2023-08-29 | 山东普赛通信科技股份有限公司 | Pipe network leak detection and location method and system based on active acoustic wave measurement |
-
1996
- 1996-11-27 JP JP31536196A patent/JPH10160614A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292302A (en) * | 1999-02-01 | 2000-10-20 | Mitsubishi Electric Corp | Abnormal location detector |
| GB2378756A (en) * | 2001-07-16 | 2003-02-19 | Thames Water Utilities | Apparatus for detecting leaks in or determing the nature of a pipe. |
| JP2009047831A (en) * | 2007-08-17 | 2009-03-05 | Toshiba Corp | Feature amount extraction apparatus, program, and feature amount extraction method |
| KR101381469B1 (en) * | 2013-08-21 | 2014-04-04 | 한국원자력연구원 | A Method for Reducing Mechanical Noise of Cross-Correlation Method for Leak Detection of a Buried Pipe |
| CN105403369A (en) * | 2015-12-16 | 2016-03-16 | 深圳供电局有限公司 | Method and system for detecting gas tightness of GIS (gas insulated switchgear) |
| JP2021021665A (en) * | 2019-07-30 | 2021-02-18 | 吉佳エンジニアリング株式会社 | Leakage detection method and leakage detector |
| JP2022169884A (en) * | 2021-04-28 | 2022-11-10 | パナソニックＩｐマネジメント株式会社 | Water leakage detection system and ultrasonic flow meter used therefor |
| CN116658835A (en) * | 2023-05-22 | 2023-08-29 | 山东普赛通信科技股份有限公司 | Pipe network leak detection and location method and system based on active acoustic wave measurement |
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