JPH02157649A - Flaw detecting device using doppler effect - Google Patents
Flaw detecting device using doppler effectInfo
- Publication number
- JPH02157649A JPH02157649A JP63312618A JP31261888A JPH02157649A JP H02157649 A JPH02157649 A JP H02157649A JP 63312618 A JP63312618 A JP 63312618A JP 31261888 A JP31261888 A JP 31261888A JP H02157649 A JPH02157649 A JP H02157649A
- Authority
- JP
- Japan
- Prior art keywords
- flaw detection
- flaw
- reference frequency
- detection device
- received
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 47
- 238000000411 transmission spectrum Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000001228 spectrum Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002592 echocardiography Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、送信振動子より連続的に超音波を出力し、受
信波のドツプラーシフトを検出してクラック等を検知す
るようにしたドツプラー効果を用いた探傷装置に関する
。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a Doppler device that continuously outputs ultrasonic waves from a transmitting transducer and detects Doppler shifts in received waves to detect cracks, etc. This article relates to a flaw detection device using effects.
［従来技術］
従来の超音波探傷装置は、第２図に示すように送受信振
動子１から水Ｗの中に設置された被探傷体２に超音波パ
ルスを発射し、被探傷体２のクラック３から反射された
超音波パルスを送受信振動子１で受信して、被探傷体２
のクラック３を検出するようにしていた。[Prior Art] As shown in FIG. 2, a conventional ultrasonic flaw detection device emits ultrasonic pulses from a transmitting/receiving transducer 1 to a test object 2 placed in water W to detect cracks in the test object 2. The ultrasonic pulse reflected from the object 3 is received by the transmitting/receiving transducer 1 and
It was designed to detect crack 3.
［発明が解決するためのａ題］
しかしながら、このように構成された従来の超音波探傷
装置では、被探傷体２のクラック３が浅い場合や、被探
傷体の表面がザラ付いた傷４があるような場合には、全
く検出できないという問題があった。[Problem A to be Solved by the Invention] However, in the conventional ultrasonic flaw detection apparatus configured as described above, there are cases where the crack 3 on the object to be detected 2 is shallow or the flaw 4 where the surface of the object to be detected is rough. In some cases, there was a problem that detection could not be performed at all.
本発明は、被探傷体の表面の浅いクラックや表面のザラ
付いた傷をドツプラーシフトにより検出するドツプラー
効果を用いた探傷’！Ｉを提供することを目的としてい
る。The present invention is a flaw detection method that uses the Doppler effect to detect shallow cracks and rough scratches on the surface of an object to be tested using Doppler shift. The purpose is to provide I.
［問題点を解決するために手段］
本発明は、上記目的を達成するために、被探傷体に対向
して移動する送信振動子及び受信振動子を備えた探傷ヘ
ッドと、前記送信振動子に連続した基準周波数の出力信
号を送る送信機と、前記受信振動子の出力から前記基準
周波数以外の周波数の信号を分離する分析回路と、該分
析回路の出力の変化を検知する検知装置とを設けたもの
である。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a flaw detection head equipped with a transmitting transducer and a receiving transducer that move opposite to an object to be tested, and a flaw detection head equipped with a transmitting transducer and a receiving transducer. A transmitter that sends a continuous output signal of a reference frequency, an analysis circuit that separates a signal of a frequency other than the reference frequency from the output of the receiving transducer, and a detection device that detects a change in the output of the analysis circuit are provided. It is something that
また、検知装置は前記探傷ヘッドの移動と出力の変化の
関係を表示する表示装置でもよい。また、検知装置はス
ピーカーでもよいし、さらにイヤーホーンでもよい。Further, the detection device may be a display device that displays the relationship between the movement of the flaw detection head and the change in output. Furthermore, the detection device may be a speaker or even an earphone.
〔作用］
本発明によれば、送信振動子及び受信振動子を設けた探
傷ヘッドを被探傷体の表面で移動させながら送信振動子
から連続して基準周波数の超音波を出力し、連続的にそ
の反射波を受信振動子で検出すると、クラックやザラ付
いた傷がある場合は。[Function] According to the present invention, while moving the flaw detection head provided with the transmitting transducer and the receiving transducer on the surface of the object to be tested, the transmitting transducer continuously outputs ultrasonic waves of the reference frequency, and continuously When the reflected waves are detected by a receiving transducer, if there are any cracks or rough scratches.
受信波にドツプラーシフトを生じるので、このドツプラ
ーシフトを生じた位置と探傷ヘッドの移動距離との関係
を表示装置で表示し、または探傷ヘッドを移動しながら
イヤホーンやスピーカーによって音の変化でクラック等
を検知することができる。Since a Doppler shift occurs in the received waves, the relationship between the position where the Doppler shift occurs and the distance traveled by the flaw detection head can be displayed on a display device, or while the flaw detection head is moving, an earphone or speaker can be used to detect cracks due to changes in sound. etc. can be detected.
［実施例］
第１図を参照すると、本発明の探傷装置では、探傷ヘッ
ド５に送信振動子６及び受信振動子７が設けられている
。また、送信振動子６に送信ドライバ８が接続され、さ
らに、送信ドライバ８に基準信号発信器９が接続されて
いる。また、受信振動子７に高周波増幅器１０が接続さ
れ、高周波増幅器１０に混合器１１が接続され、さらに
、混合器１１に帯域通過フィルタ１２を介して表示装置
１３が接続されている。なお、基準信号発信器９の出力
は混合器１１に接続されている。[Example] Referring to FIG. 1, in the flaw detection apparatus of the present invention, a flaw detection head 5 is provided with a transmitting transducer 6 and a receiving transducer 7. Further, a transmission driver 8 is connected to the transmission vibrator 6, and a reference signal transmitter 9 is further connected to the transmission driver 8. Further, a high frequency amplifier 10 is connected to the receiving transducer 7, a mixer 11 is connected to the high frequency amplifier 10, and a display device 13 is further connected to the mixer 11 via a band pass filter 12. Note that the output of the reference signal generator 9 is connected to the mixer 11.
このように構成された本発明の探傷装置では。In the flaw detection apparatus of the present invention configured as described above.
探傷ヘッド５が水Ｗの中に設けられた被探傷体１の表面
に対向して移動される。そして、送信ドライバ８から出
力される信号は、第２図（ａ）に示すようにほぼ基準周
波数ｆ０の近傍の幅の狭い送信スペクトルを有している
ので、送信振動子６から出力される超音波もこのような
送信スペクトルを持っている。そして、受信振動子７で
受信される超音波は探傷ヘッドが移動しているときにク
ラック３や表面のザラ付いた傷４がなければ、第２図（
ａ）の送信スペクトルを持つ超音波が受信される。ここ
で、被探傷体にクラック３やザラ付いた傷４があれば、
受信振動子７で受信した超音波は、第２図（ｂ）に示す
ように基準周波数ｆ０から僅かにずれた周波数が含まれ
た受信スペクトルを有する。そして、この受信スペクト
ルを有する超音波は受信振動子７で電気信号に変換され
、混合器１１で基準周波数との混合を行った後、第２図
（ｃ）の点ｇＡで示すフィルタ特性を持つ帯域通過フィ
ルタ１２を通すと、基準周波数ｆ。の近傍の送信スペク
トルがカットされ、第２図（ｄ）に示すように出力され
る。この信号は探傷ヘッド５の移動とともに表示装置１
３で表示されるので、被探傷体２のどの位置かが対応し
て表示される。The flaw detection head 5 is moved facing the surface of the object to be flawed 1 placed in water W. Since the signal output from the transmission driver 8 has a narrow transmission spectrum approximately near the reference frequency f0 as shown in FIG. Sound waves also have a transmission spectrum like this. If there are no cracks 3 or rough scratches 4 on the surface while the flaw detection head is moving, the ultrasonic waves received by the receiving transducer 7 are transmitted as shown in Fig. 2 (
Ultrasonic waves having a transmission spectrum of a) are received. Here, if there are cracks 3 or rough scratches 4 on the object to be inspected,
The ultrasonic wave received by the reception transducer 7 has a reception spectrum that includes a frequency slightly shifted from the reference frequency f0, as shown in FIG. 2(b). Then, the ultrasonic wave having this reception spectrum is converted into an electric signal by the reception transducer 7, and after being mixed with the reference frequency by the mixer 11, it has the filter characteristic shown at point gA in FIG. 2(c). When passed through the bandpass filter 12, the reference frequency f. The transmission spectrum in the vicinity of is cut and output as shown in FIG. 2(d). This signal is transmitted to the display device 1 as the flaw detection head 5 moves.
3, the position of the object 2 to be tested 2 is displayed correspondingly.
なお、この信号をイヤホーンまたはスピーカー等で音の
変化として出力すれば、探傷ヘッド５を移動しながら被
探傷体２の目に見えないクラック３等の位置を簡単に検
出することができ、その位置にペンキ等で印を付けるこ
とができる。Note that if this signal is output as a change in sound using an earphone or speaker, the position of the invisible crack 3 etc. on the object to be tested 2 can be easily detected while moving the flaw detection head 5, and the position of the invisible crack 3 etc. can be easily detected. can be marked with paint, etc.
本発明の探傷装置では、このように探傷ヘッド５を移動
して、クラック３や表面のザラ付き４が探傷ヘッド５の
近傍にくることによって、超音波の周波数の変化として
検出するので、受信振動子７で受信された信号で表示装
置１４の表示に変化が見られ、またイヤホーンやスピー
カーの場合は音の変化として検出される。従って１表面
やその近傍に傷がない場合は、超音波を一部受信するが
。In the flaw detection apparatus of the present invention, by moving the flaw detection head 5 in this way and bringing the cracks 3 and surface roughness 4 close to the flaw detection head 5, they are detected as changes in the frequency of the ultrasonic waves. The signal received by the child 7 causes a change in the display on the display device 14, and in the case of an earphone or speaker, it is detected as a change in sound. Therefore, if there are no scratches on the surface or its vicinity, a portion of the ultrasonic waves will be received.
周波数が変化しないので、全く傷がないものとして識別
することができる。これに対して、従来の探傷装置では
１間欠的に発射する超音波の反射エコーでクラックを検
出しているため、雑音等でもクラックとして検出すると
いう欠点がある。Since the frequency does not change, it can be identified as having no scratches at all. On the other hand, conventional flaw detection equipment detects cracks using reflected echoes of ultrasonic waves that are emitted intermittently, and therefore has the disadvantage that even noise or the like can be detected as cracks.
［発明の効果］
本発明は、以上のように構成されているので、探傷ヘッ
ドを移動することにより、クランクやザラ付いた傷があ
る場合に、超音波の周波数の変化として検出することが
でき、受信された信号で表示装置の表示に変化が見られ
、またイヤホーンやスピーカーでは音の変化として検出
されるので。[Effects of the Invention] Since the present invention is configured as described above, by moving the flaw detection head, if there is a crank or rough flaw, it can be detected as a change in the frequency of the ultrasonic wave. , The received signal causes a change in the display on the display device, and is also detected as a change in the sound on earphones and speakers.
検出精度が高いという利点がある。It has the advantage of high detection accuracy.
第１図は本発明の１実施例の探傷装置のブロック図、第
２図は従来の探傷装置を説明するための図である。
５・・・探傷ヘッド、６・・・送信振動子、７・・・受
信振動子、８・・・送信ドライバ、９・・・基準信号発
信器、１０・・・高周波増幅器、１１・・・混合器、１
２・・・帯域通過フィルタ、１３・・・表示装置。
第
図
手続補正書（自制
第
図
１゜
２゜
３゜
４゜
事件の表示
昭和６２３年特許願第３１２６１、
発明の名称
ドツプラー効果を用いた探傷装置
補正をする者
事件との関係 特許出願人
住 所 愛知県豊橋市大岩町字小山塚２０番地氏 名
本多電子株式会社FIG. 1 is a block diagram of a flaw detection apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining a conventional flaw detection apparatus. 5... Flaw detection head, 6... Transmitting transducer, 7... Receiving transducer, 8... Transmitting driver, 9... Reference signal transmitter, 10... High frequency amplifier, 11... mixer, 1
2...Band pass filter, 13...Display device. Chart procedural amendment (Self-restraint chart 1゜2゜3゜4゜Indication of case 1986 Patent Application No. 31261, Name of invention Relationship with case of person who corrects flaw detection device using Doppler effect Patent applicant residence Address: 20 Koyamazuka, Oiwa-cho, Toyohashi-shi, Aichi Prefecture Name:
Honda Electronics Co., Ltd.
Claims (1)
動子を備えた探傷ヘッドと、前記送信振動子に連続した
基準周波数の出力信号を送る送信機と、前記受信振動子
の出力から前記基準周波数以外の周波数の信号を分離す
る分析回路と、該分析回路の出力の変化を検知する検知
装置とを設けたことを特徴とするドップラー効果を用い
た探傷装置。 ２、前記検知装置は前記探傷ヘッドの移動と出力の変化
の関係を表示する表示装置であることを特徴とする請求
項１記載のドップラー効果を用いた探傷装置。 ３、前記検知装置はスピーカーであることを特徴とする
請求項１記載のドップラー効果を用いた探傷装置。 ４、前記検知装置はイャーホーンであることを特徴とす
る請求項１記載のドップラー効果を用いた探傷装置。[Scope of Claims] 1. A flaw detection head equipped with a transmitting transducer and a receiving transducer that move opposite to the object to be tested; a transmitter that sends an output signal of a continuous reference frequency to the transmitting transducer; A flaw detection device using the Doppler effect, comprising: an analysis circuit that separates signals of frequencies other than the reference frequency from the output of a receiving transducer; and a detection device that detects changes in the output of the analysis circuit. 2. The flaw detection device using the Doppler effect according to claim 1, wherein the detection device is a display device that displays the relationship between the movement of the flaw detection head and the change in output. 3. The flaw detection device using the Doppler effect according to claim 1, wherein the detection device is a speaker. 4. The flaw detection device using the Doppler effect according to claim 1, wherein the detection device is an earphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63312618A JPH02157649A (en) | 1988-12-09 | 1988-12-09 | Flaw detecting device using doppler effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63312618A JPH02157649A (en) | 1988-12-09 | 1988-12-09 | Flaw detecting device using doppler effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02157649A true JPH02157649A (en) | 1990-06-18 |
Family
ID=18031370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63312618A Pending JPH02157649A (en) | 1988-12-09 | 1988-12-09 | Flaw detecting device using doppler effect |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02157649A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002040001A (en) * | 2000-07-25 | 2002-02-06 | Mitsui Eng & Shipbuild Co Ltd | Flaw detection method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51126171A (en) * | 1974-12-23 | 1976-11-04 | Yokogawa Hewlett Packard Ltd | Detecting device of moving object |
| JPS51129259A (en) * | 1975-05-06 | 1976-11-10 | Marine Instr Co Ltd | Display method of investigation device |
| JPS63203141A (en) * | 1987-02-20 | 1988-08-23 | 株式会社 日立メデイコ | Ultrasonic doppler flow speed detector |
-
1988
- 1988-12-09 JP JP63312618A patent/JPH02157649A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51126171A (en) * | 1974-12-23 | 1976-11-04 | Yokogawa Hewlett Packard Ltd | Detecting device of moving object |
| JPS51129259A (en) * | 1975-05-06 | 1976-11-10 | Marine Instr Co Ltd | Display method of investigation device |
| JPS63203141A (en) * | 1987-02-20 | 1988-08-23 | 株式会社 日立メデイコ | Ultrasonic doppler flow speed detector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002040001A (en) * | 2000-07-25 | 2002-02-06 | Mitsui Eng & Shipbuild Co Ltd | Flaw detection method and device |
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