JPH0783887A - Acoustic emission sensor with horn - Google Patents

Acoustic emission sensor with horn

Info

Publication number
JPH0783887A
JPH0783887A JP5231108A JP23110893A JPH0783887A JP H0783887 A JPH0783887 A JP H0783887A JP 5231108 A JP5231108 A JP 5231108A JP 23110893 A JP23110893 A JP 23110893A JP H0783887 A JPH0783887 A JP H0783887A
Authority
JP
Japan
Prior art keywords
sensor
horn
signal
acoustic emission
signal detection
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
Application number
JP5231108A
Other languages
Japanese (ja)
Inventor
Kyosuke Yasuda
享祐 安田
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP5231108A priority Critical patent/JPH0783887A/en
Publication of JPH0783887A publication Critical patent/JPH0783887A/en
Pending legal-status Critical Current

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  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To provide an acoustic emission sensor having a horn, having the capability of measuring an acoustic emission signal generated from a micro part or a specific micro zone with high sensitivity and efficiency. CONSTITUTION:This sensor features that a truncated cone type horn 4 having a sharpened or rounded upper end, or having a flat upper edge 4a with the upper end section of the conical shape cut in parallel to the bottom surface 4b thereof is fitted to an acoustic emission sensor 1' so that the bottom surface 4b is connected to the signal detection element side 1a of the sensor 1', and the upper end or upper edge 4a of the horn 4 is used as a signal detection element for the micro generation zone of an acoustic emission signal.

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、微小部品及び特定微小
領域のアコースティック・エミッション信号の測定に供
されるホーン付アコースティック・エミッション・セン
サに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic emission sensor with a horn used for measuring an acoustic emission signal of a minute component and a specific minute region.

【0002】[0002]

【従来の技術】従来のアコースティック・エミッション
・センサ(Acoustic Emission Sensor、以下、AEセン
サとする)は、センサ本体が円筒形状(数mm径〜数c
m径)をなし、その端面がアコースティック・エミッシ
ョン信号(以下、AE信号とする)の検出面となってい
る。これは、AE信号検出対象がAEセンサ全体形状と
同等あるいはそれよりも大きいものを想定していたため
である。
2. Description of the Related Art In a conventional acoustic emission sensor (hereinafter referred to as AE sensor), a sensor body has a cylindrical shape (several mm diameter to several c).
m diameter), and its end face serves as a detection face for an acoustic emission signal (hereinafter referred to as AE signal). This is because it is assumed that the AE signal detection target is equal to or larger than the entire shape of the AE sensor.

【0003】ここで、従来のAEセンサの内部構造を図
面に示す。図5は、AEセンサの内部構造を示す断面図
である。図中、1はAE信号検出面1aを有するAEセ
ンサ、2はセンサ素子、3は測定信号を外部測定機器に
導出する信号線である。なお、AE信号とは、数百kH
z〜数MHzのオーダにわたる超音波信号のことであ
る。
Here, the internal structure of a conventional AE sensor is shown in the drawings. FIG. 5 is a cross-sectional view showing the internal structure of the AE sensor. In the figure, 1 is an AE sensor having an AE signal detection surface 1a, 2 is a sensor element, and 3 is a signal line for guiding a measurement signal to an external measuring device. Note that the AE signal is several hundreds of kHz
Ultrasonic signals ranging from z to several MHz.

【0004】[0004]

【発明が解決しようとする課題】しかし、AEセンサ1
の全体形状より小さい部品や特定微小領域から発生する
AE信号を検出する場合にこのような検出面1a形状の
面積の大きいセンサでは対応が困難である。すなわち、
円筒形状端面の全域がAE信号検出面1aとなっている
AEセンサ1では、特定微小領域との接触加圧がまず不
可能である。
However, the AE sensor 1
When detecting an AE signal generated from a component smaller than the overall shape or a specific minute area, it is difficult to deal with such a sensor having a large area of the detection surface 1a. That is,
In the AE sensor 1 in which the entire area of the cylindrical end surface is the AE signal detection surface 1a, contact pressurization with a specific minute area is first impossible.

【0005】また、微小部品の場合は、AE信号検出面
1aのどの部分に接触させるかで検出感度が極端に異な
るという問題点があった。ここにおいて本発明は、微小
部品や特定微小領域から発生するAE信号を高感度にか
つ能率よく測定することが可能なAEセンサを提供せん
とするものである。
Further, in the case of minute parts, there is a problem that the detection sensitivity is extremely different depending on which part of the AE signal detecting surface 1a is brought into contact with. Here, the present invention is to provide an AE sensor capable of highly sensitively and efficiently measuring an AE signal generated from a minute component or a specific minute region.

【0006】[0006]

【課題を解決するための手段】上記課題の解決は、本発
明の次の新規な特徴的構成手段を採用することにより達
成される。すなわち、本発明の特徴は、アコースティッ
ク・エミッション・センサの信号検出素子面に、上端が
先鋭状か丸味を帯びた円錐形又は当該円錐形上端部を下
底に平行にカットした円錐台形形状のホーンの下底面を
取り付け、当該ホーンの上端をアコースティック・エミ
ッション信号微小発生領域の信号検出端としてなるホー
ン付アコースティック・エミッション・センサである。
The solution to the above problems can be achieved by adopting the following novel characteristic construction means of the present invention. That is, the feature of the present invention is that the signal detection element surface of the acoustic emission sensor has a conical shape with a sharp or rounded upper end, or a truncated cone-shaped horn in which the upper end of the conical shape is cut parallel to the lower bottom. It is an acoustic emission sensor with a horn, in which the lower bottom surface is attached and the upper end of the horn serves as a signal detection end of the acoustic emission signal minute generation area.

【0007】[0007]

【作用】本発明のホーン付AEセンサは、上記のような
構成手段を採用するので、円錐又は円錐台形形状のホー
ンが、AEセンサの信号検出面に対して導波路の役割を
果たしているので、AE信号源の発生するある一定周波
数信号をAEセンサの信号検出面全体に同位相で伝播さ
せる。従って、微小領域に円錐又は円錐台形形状のホー
ンの上端を接触させることで、微小部品や特定微小領域
から発生するAE信号を高感度にかつ能率よく測定する
ことが可能となる。
Since the AE sensor with a horn of the present invention employs the above-described constituent means, the cone-shaped or truncated-cone-shaped horn functions as a waveguide for the signal detection surface of the AE sensor. A certain constant frequency signal generated by the AE signal source is propagated in-phase over the entire signal detection surface of the AE sensor. Therefore, by bringing the upper end of the horn having a conical or frustoconical shape into contact with the minute area, it becomes possible to measure the AE signal generated from the minute part or the specific minute area with high sensitivity and efficiency.

【0008】[0008]

【実施例】本発明の実施例を図面につき説明する。図1
(a)は本実施例のAEセンサの平面図,図1(b)は
本実施例のAEセンサの正面図である。図中、αは本実
施例のAEセンサ、1′はAE信号検出面1aを有する
AEセンサ本体、4は外周面を上細テーパーとした円錐
台形ホーン、4aは円錐台形ホーン4の上端面である。
Embodiments of the present invention will be described with reference to the drawings. Figure 1
FIG. 1A is a plan view of the AE sensor of this embodiment, and FIG. 1B is a front view of the AE sensor of this embodiment. In the figure, α is the AE sensor of the present embodiment, 1'is an AE sensor body having an AE signal detection surface 1a, 4 is a truncated cone horn having an outer peripheral surface with a fine taper, and 4a is an upper end surface of the truncated cone horn 4. is there.

【0009】本実施例のAEセンサαにおいては、円錐
台形ホーン4の下底面4bはAEセンサ本体1′の信号
検出面1aに接着固定されている。したがって、本実施
例のAEセンサαでは、円錐台形ホーン4の上端面4a
がAE信号検出面となる。すなわち、円錐台形ホーン4
は、AEセンサ本体1′の信号検出面1a側に対するA
E信号の導波路の役割を果たす。
In the AE sensor α of this embodiment, the lower bottom surface 4b of the truncated cone horn 4 is adhesively fixed to the signal detection surface 1a of the AE sensor body 1 '. Therefore, in the AE sensor α of this embodiment, the upper end surface 4a of the truncated cone horn 4 is
Is the AE signal detection surface. That is, the truncated cone horn 4
Is A for the signal detection surface 1a side of the AE sensor body 1 '.
It functions as a waveguide for the E signal.

【0010】(実験例)従来のAEセンサ1では、AE
センサ本体1′の信号検出面1aをそのまま微小部品に
接触させ測定しなければならない。この場合、実験によ
れば、信号検出面の位置により、検出感度のばらつきが
大きいことが判明した。以下に、本実施例の有効性を示
す実験例及びその結果を示す。
(Experimental Example) In the conventional AE sensor 1,
The signal detection surface 1a of the sensor body 1'should be directly contacted with a minute component for measurement. In this case, according to the experiment, it was found that the detection sensitivity greatly varies depending on the position of the signal detection surface. Below, the experimental example which shows the effectiveness of this Example and its result are shown.

【0011】図2(a)は実験に使用したAEセンサα
の模式図であり、図2(b)は実験に使用したAE信号
源である。図中、βはAE信号源、5は圧電素子、6は
板バネ、7は振動子たるルビー球、8は杆である。
FIG. 2A shows the AE sensor α used in the experiment.
2 (b) is an AE signal source used in the experiment. In the figure, β is an AE signal source, 5 is a piezoelectric element, 6 is a leaf spring, 7 is a ruby ball as a vibrator, and 8 is a rod.

【0012】実験に使用したAEセンサαは、図2
(a)に示すよう、従来のAEセンサ本体1′の信号検
出面1aに円錐台形ホーン4を油膜を介して仮設置した
ものを使用した。円錐台形ホーン4の下底面4b直径は
5mmφ,上端面4aの直径は1mmφとし、その長さ
Lを5〜40mmまで変化させて実験を行った。
The AE sensor α used in the experiment is shown in FIG.
As shown in (a), a conventional AE sensor main body 1'having a truncated cone-shaped horn 4 temporarily installed on the signal detection surface 1a via an oil film was used. The diameter of the lower bottom surface 4b of the truncated cone horn 4 was 5 mmφ and the diameter of the upper end surface 4a was 1 mmφ, and the length L was varied from 5 to 40 mm to carry out the experiment.

【0013】一方、AE信号源βは、図2(b)に示す
よう、杆8先端下面に板バネ6基端を延長取付け、当該
杆8先端上面に圧電素子(大きさは1mm×1mm×
0.5mm)5を張り付け、かつ板バネ6の先端下面に
は0.4mmφの微小ルビー球7を接着固定したものを
用いている。
On the other hand, in the AE signal source β, as shown in FIG. 2B, the base end of the plate spring 6 is extendedly attached to the lower surface of the tip of the rod 8 and the piezoelectric element (size is 1 mm × 1 mm ×
0.5 mm) 5 is attached, and a 0.4 mmφ minute ruby ball 7 is bonded and fixed to the lower surface of the tip of the leaf spring 6.

【0014】電圧駆動された圧電素子5の高周波微振動
すなわちAE信号は板バネ6を介して先端のルビー球7
にまで伝播する。この板バネ6先端のルビー球7を微小
部品AE信号源βとみなして以下の実験を行った。
High-frequency micro-vibration of the piezoelectric element 5 driven by voltage, that is, AE signal is transmitted through the leaf spring 6 to the ruby ball 7 at the tip.
Propagate to. The following experiment was conducted by regarding the ruby ball 7 at the tip of the leaf spring 6 as the minute component AE signal source β.

【0015】図3は上記に示したAEセンサαとAE信
号源βを用いた実験系の概要であり、図4は当該実験の
測定結果の一例である。本実施例の実験においては、図
3に示すように、AE信号源βの信号源たるルビー球7
を板バネ6の圧力(加圧力=15g)でAEセンサαの
AE信号検出面たる上端面4aに押しつけ、杆8の先端
上面に配した圧電素子5駆動電圧と本実施例のAEセン
サαから得られるAE信号出力電圧との関係を測定し
た。
FIG. 3 is an outline of an experimental system using the AE sensor α and the AE signal source β shown above, and FIG. 4 is an example of the measurement result of the experiment. In the experiment of the present embodiment, as shown in FIG. 3, the ruby ball 7 which is the signal source of the AE signal source β
Is pressed against the upper end surface 4a, which is the AE signal detection surface of the AE sensor α, by the pressure of the leaf spring 6 (pressing force = 15 g), and the piezoelectric element 5 drive voltage arranged on the upper surface of the tip of the rod 8 and the AE sensor α of this embodiment are The relationship with the obtained AE signal output voltage was measured.

【0016】また、比較参照のため、円錐台形ホーン4
を取り除いた図5に示す従来と同一の型のAEセンサ本
体1′の信号検出面1aに対しても、同様な実験を行っ
た。その結果、従来のセンサと同一の型のAEセンサ本
体1′の信号検出面1aに直接ルビー球7を加圧するよ
りも、円錐台形ホーン4を取付け、この上端面4aにル
ビー球7を押しつけた方が測定感度が高くなることがわ
かった。
For the purpose of comparison, a truncated cone horn 4 is also provided.
The same experiment was performed on the signal detection surface 1a of the AE sensor body 1'of the same type as the conventional one shown in FIG. As a result, rather than directly pressing the ruby ball 7 on the signal detecting surface 1a of the AE sensor body 1'of the same type as the conventional sensor, the truncated cone horn 4 is attached and the ruby ball 7 is pressed against the upper end surface 4a. It was found that the measurement sensitivity was higher.

【0017】また、ホーンのない従来と同一の型のAE
センサ本体1′の信号検出面1aの場合、ルビー球7の
押し付け位置によって、検出感度や高感度周波数に変化
があるが、ほぼ中心位置で最も感度が高い。図4は円錐
台形ホーン4のホーン長L=10mmの場合の周波数特
性を従来型センサ1のデータと比較したものである。な
お、両データとも、AEセンサには同一のものを使用し
ている。
Further, the same type of AE as the conventional one without a horn is used.
In the case of the signal detection surface 1a of the sensor main body 1 ', the detection sensitivity and the high-sensitivity frequency change depending on the pressing position of the ruby ball 7, but the sensitivity is highest at almost the center position. FIG. 4 compares the frequency characteristics of the truncated cone horn 4 when the horn length L = 10 mm with the data of the conventional sensor 1. The same AE sensor is used for both data.

【0018】図4から明らかなように、円錐台形ホーン
4を取り付けた本実施例のAEセンサαの方が、従来の
AEセンサ本体1′単体よりも格段に測定感度が高い。
ここで、本実施例の円錐台形ホーン4について考察して
みる。円錐台形ホーン4は、振動子たるルビー球7の発
生するある一定周波数信号をAEセンサ本体1′の信号
検出面1a全体に同位相で伝播させる役割を果たしてい
ると考えられる。
As is apparent from FIG. 4, the AE sensor α of this embodiment having the truncated cone horn 4 attached thereto has a remarkably higher measurement sensitivity than the conventional AE sensor main body 1 ′ alone.
Now, let us consider the truncated cone horn 4 of this embodiment. It is considered that the truncated cone-shaped horn 4 plays a role of propagating a certain constant frequency signal generated by the ruby sphere 7, which is a vibrator, in the same phase over the entire signal detection surface 1a of the AE sensor body 1 '.

【0019】これに対し、ルビー球7を直接AEセンサ
本体1′の信号検出面1aに押し付けた場合は、信号検
出面1aのほかの離れた位置には、一定周波数の異なる
位相の信号が加わると考えられる。従って、AEセンサ
本体1′の全体としての信号検出感度は、円錐台形ホー
ン4を介した場合に比較して低下するのである。
On the other hand, when the ruby ball 7 is directly pressed against the signal detecting surface 1a of the AE sensor body 1 ', signals having different constant phases are applied to other distant positions of the signal detecting surface 1a. it is conceivable that. Therefore, the signal detection sensitivity of the AE sensor body 1'as a whole is lower than that when the truncated cone horn 4 is used.

【0020】以上の実験及び考察の結果から、円錐台形
ホーン4の上端面4aの外径は、AE信号検出対象部品
又は領域にあわせて任意の外径に設定することが可能で
ある。また、対象部品又は領域によっては、上端面4a
の形状は平面に限定されることなく、球面あるいは針状
の形状であってもよい。
From the results of the above experiment and consideration, it is possible to set the outer diameter of the upper end surface 4a of the truncated cone horn 4 to an arbitrary outer diameter according to the AE signal detection target component or area. In addition, depending on the target part or area, the upper end surface 4a
The shape of is not limited to a flat surface, and may be a spherical shape or a needle shape.

【0021】また、円錐台形ホーン4とAEセンサ本体
1′との結合は、上記実験例においては、実験の都合上
油膜を介して設置したが、そのほかに、直接接着剤で固
定する、あるいは、ボルト・ナット形式で固定するなど
の手段を採用してもよいことは、いうまでもない。
Further, the frustoconical horn 4 and the AE sensor main body 1'were connected to each other through an oil film in the above experimental example for the convenience of the experiment. It goes without saying that a means such as fixing with a bolt / nut type may be adopted.

【0022】[0022]

【発明の効果】以上のように、本発明によれば、微小A
E信号出力端に合せてホーンの上端を如何ようにも縮径
可能なので、従来困難であった微小部品あるいは特定微
小領域から発生するAE信号を容易に測定することが可
能である等、優れた有用性を発揮する。
As described above, according to the present invention, the minute A
Since the diameter of the upper end of the horn can be reduced in accordance with the E signal output end, it is possible to easily measure the AE signal generated from a minute component or a specific minute area, which was difficult in the past. Demonstrate usefulness.

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

【図1】(a)は本発明の実施例におけるAEセンサの
平面図,(b)は同・正面図である。
1A is a plan view of an AE sensor according to an embodiment of the present invention, and FIG. 1B is a front view of the same.

【図2】(a)は本発明の実施例の実験に使用したAE
センサの模式図であり、(b)は実験に使用したAE信
号源の模式図である。
FIG. 2 (a) is an AE used in an experiment of an example of the present invention.
It is a schematic diagram of a sensor, (b) is a schematic diagram of the AE signal source used for experiment.

【図3】図2に示したAEセンサとAE信号源を用いた
実験系の概要である。
3 is an outline of an experimental system using the AE sensor and AE signal source shown in FIG.

【図4】図3に示した実験系を用いた実験の測定結果の
一例である。
4 is an example of measurement results of an experiment using the experimental system shown in FIG.

【図5】AEセンサの内部構造を示す断面図である。FIG. 5 is a cross-sectional view showing the internal structure of the AE sensor.

【符号の説明】[Explanation of symbols]

α…AEセンサ β…AE信号源 1…AEセンサ 1′…AEセンサ本体 1a…AE信号検出面 2…センサ素子 3…信号線 4…円錐台形ホーン 4a…上端面 4b…下底面 5…圧電素子 6…板バネ 7…ルビー球 8…杆 α ... AE sensor β ... AE signal source 1 ... AE sensor 1 '... AE sensor main body 1a ... AE signal detection surface 2 ... Sensor element 3 ... Signal line 4 ... Frustum-conical horn 4a ... Upper end surface 4b ... Lower bottom surface 5 ... Piezoelectric element 6 ... Leaf spring 7 ... Ruby ball 8 ... Rod

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】アコースティック・エミッション・センサ
の信号検出素子面上に、 上端が先鋭状か丸味を帯びた円錐形又は当該円錐形上端
部を下底面に平行にカットした平坦面とする円錐台形形
状のホーン下底面を取り付け、 当該ホーンの上端をアコースティック・エミッション信
号微小発生領域の信号検出端としたことを特徴とするホ
ーン付アコースティック・エミッション・センサ。
1. A frusto-conical shape in which the upper end is a sharp or rounded conical shape or a flat surface obtained by cutting the upper end of the conical shape parallel to the lower bottom surface on the signal detection element surface of the acoustic emission sensor. An acoustic emission sensor with a horn, characterized in that the bottom bottom surface of the horn is attached and the upper end of the horn serves as a signal detection end of the minute region of the acoustic emission signal.
JP5231108A 1993-09-17 1993-09-17 Acoustic emission sensor with horn Pending JPH0783887A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5231108A JPH0783887A (en) 1993-09-17 1993-09-17 Acoustic emission sensor with horn

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5231108A JPH0783887A (en) 1993-09-17 1993-09-17 Acoustic emission sensor with horn

Publications (1)

Publication Number Publication Date
JPH0783887A true JPH0783887A (en) 1995-03-31

Family

ID=16918431

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5231108A Pending JPH0783887A (en) 1993-09-17 1993-09-17 Acoustic emission sensor with horn

Country Status (1)

Country Link
JP (1) JPH0783887A (en)

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JP2019049418A (en) * 2017-09-08 2019-03-28 国立大学法人 名古屋工業大学 Thermal cycle testing device, thermal cycle testing method, production method of semiconductor device, and program

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JP2019049418A (en) * 2017-09-08 2019-03-28 国立大学法人 名古屋工業大学 Thermal cycle testing device, thermal cycle testing method, production method of semiconductor device, and program
CN107687890A (en) * 2017-10-20 2018-02-13 中国计量大学 Vector microphone with horn structure

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