JPH0337129B2 - - Google Patents
Info
- Publication number
- JPH0337129B2 JPH0337129B2 JP7846885A JP7846885A JPH0337129B2 JP H0337129 B2 JPH0337129 B2 JP H0337129B2 JP 7846885 A JP7846885 A JP 7846885A JP 7846885 A JP7846885 A JP 7846885A JP H0337129 B2 JPH0337129 B2 JP H0337129B2
- Authority
- JP
- Japan
- Prior art keywords
- holding
- measured
- sound
- wave
- members
- 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.)
- Expired
Links
- 239000007788 liquid Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical group Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H5/00—Measuring propagation velocity of ultrasonic, sonic or infrasonic waves, e.g. of pressure waves
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は固体内の横波、縦波音波の伝播速度を
測定する音速測定器に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a sound velocity measuring instrument for measuring the propagation velocity of transverse waves and longitudinal sound waves in solids.
（従来の技術）
従来の音速測定において、第５図に示すように
液体中に被測定物１を浸けて測定する場合は、液
体中に送受波器（図示省略）を正向して配置し、
音ビームに垂直に厚さｄの被測定物１をおく、一
般に固体中の方が液体より音速が大きいから、受
波パルスの時間は固体中に比べ原点側にずれる。
そこで受波器の位置を遠ざけて、もとと同じ位置
まで受波パルスを動かす。このときの受波器の移
動距離をd′とすると、被測定物中の縦波音速Ctは
Ct＝Coｄ／ｄ−ｄ
で求められる。但し、Coは液体の音速である。(Prior art) In conventional sound velocity measurements, when measuring the object 1 to be measured by immersing it in a liquid as shown in Fig. 5, a transducer (not shown) is placed in the liquid facing forward. ,
An object to be measured 1 with a thickness of d is placed perpendicular to the sound beam. Generally, the speed of sound is greater in a solid than in a liquid, so the time of the received pulse is shifted toward the origin compared to that in a solid.
Therefore, move the receiver further away and move the received pulse to the same position as before. If the moving distance of the receiver at this time is d', then the longitudinal sound velocity Ct in the object to be measured can be found as Ct=Cod/dd. However, Co is the speed of sound in liquid.
今、第５図に示すように、被測定物１を音ビー
ムに縦波の臨界角θt＝sin-1（Co／Ct）以上の入射
角θにおくと、被測定物中には横波のみ伝播する
ので、横波音速Ct′は
Ct′＝Co ｄ／ｄ cos（θ−）−d′cos
又はsinθ／sin＝Co／Ct′
で求めることができる。 Now, as shown in Fig. 5, when the object to be measured 1 is placed in the sound beam at an incident angle θ greater than the critical angle of longitudinal waves θt = sin -1 (Co/Ct), only transverse waves will be present in the object to be measured. Since the transverse wave propagates, the transverse wave sound speed Ct' can be determined as Ct'=Co d/d cos(θ-)-d'cos or sin θ/sin=Co/Ct'.
（発明が解決しようとする問題点）
前記の従来手段は、被測定物を液中に浸けなけ
ればならないので、測定が非常に面倒である。又
液体を吸収するような気泡性の物体は測定できな
かつた。(Problems to be Solved by the Invention) In the conventional means described above, measurement is very troublesome because the object to be measured must be immersed in the liquid. Also, it was not possible to measure bubbles that absorb liquid.
そこで、本発明においては、液体中に被測定物
を浸漬することなく、簡単に縦波、横波音速を求
めることができる音速測定器を提供しようとする
ものである。 Therefore, an object of the present invention is to provide a sound velocity measuring device that can easily determine longitudinal wave and transverse wave sound velocities without immersing an object to be measured in a liquid.
（問題点を解決するための手段）
本発明における音速測定器は、平坦な保持面３
の中心軸線Ｏの位置をずらせて対向させ、保持面
３で被測定物１を圧着し、中心軸線を中心にした
円弧状案内面４を保持面３の反対側に設けた半円
柱状の一対の保持部材２，２′と、保持部材２，
２′の円弧状案内面４に沿つて移動自在に設けた
送波器１６と受波器１６′とから成るものである。
(Means for Solving the Problems) The sound velocity measuring instrument according to the present invention has a flat holding surface 3
A pair of semi-cylindrical cylinders in which the holding surface 3 is crimped against the object 1 to be measured, and an arc-shaped guide surface 4 centered on the central axis O is provided on the opposite side of the holding surface 3. holding members 2, 2', holding members 2,
It consists of a wave transmitter 16 and a wave receiver 16' which are movably provided along the arc-shaped guide surface 4 of 2'.
（作用）
本発明においては、保持部材２，２′の夫々円
弧状案内面４に沿つて送波器１６及び受波器１
６′を移動させて、音波の伝播時間と伝播減衰を
測定し、減衰が最小になる角度を求めて音速を測
定する。(Function) In the present invention, the wave transmitter 16 and the wave receiver 1
6' is moved to measure the propagation time and propagation attenuation of the sound wave, and the angle at which the attenuation is minimized is determined to measure the speed of sound.
（実施例）
本発明の実施例を第１図乃至第３図に基いて詳
細に説明すると、被測定物１を挾持するアクリル
製の保持部材２，２′は夫々半円柱状に形成して
いる。即ち、保持面３を第２図に示すように平坦
面で形成し、その中心軸線Ｏを中心にした円弧に
よつて円弧状案内面４を形成する。そして、保持
面３は第２図に示すように中心軸線Ｏ，Ｏを所定
の軸間距離Δlだけずらせて対向させて設置する。(Example) An example of the present invention will be described in detail based on FIGS. 1 to 3. The acrylic holding members 2 and 2' that hold the object to be measured 1 are each formed into a semi-cylindrical shape. There is. That is, the holding surface 3 is formed as a flat surface as shown in FIG. 2, and the arc-shaped guide surface 4 is formed by an arc centered on the central axis O thereof. As shown in FIG. 2, the holding surfaces 3 are disposed so that their central axes O, O are opposed to each other with their center axes O shifted by a predetermined interaxial distance Δl.
両保持部材２，２′は夫々下面に、保持部材２，
２′の半径の約3.5倍の半径を有する半円形の角度
目盛盤５を固定し、両角度目盛盤５の夫々裏面で
保持部材２，２′が位置する個所に、支持部材６，
６′を固定し、一方の支持部材６を台盤７上に固
定し、他方の支持部材６′を移動できるように台
盤７上に乗架して両保持部材２，２′の保持面３，
３が中心軸線Ｏ，ＯがΔlだけずれた位置で対向
して設置できるようになつている。 Both the holding members 2, 2' have the holding members 2, 2' on the lower surface, respectively.
A semicircular angle dial 5 having a radius approximately 3.5 times the radius of 2' is fixed, and support members 6,
6' is fixed, one support member 6 is fixed on a base plate 7, and the other support member 6' is mounted on the base plate 7 so that it can be moved. 3,
3 can be installed facing each other with the center axes O and O shifted by Δl.
又、両保持部材２，２′の上面には支持部材８，
８′を固定している。そして、両支持部材８，
８′と前記両支持部材６，６′に夫々案内軸９，
９′を挿通し、一方の支持部材８，６に案内軸９，
９′を固定して案内軸９，９′の案内で他方の支持
部材８′，６′を支持部材８，６に対して近づけた
り遠ざけたりできるようになつている。そして、
両案内軸９，９′の高さ方向における中央側に調
整ネジ棒１０，１０′を夫々一方の支持部材８′，
６′に挿通して対向する他方の支持部材８，６に
夫々螺合して止ナツト１１，１１′で固定する。
両調整ネジ棒１０，１０′の外側端には夫々調整
摘み１２，１２′を螺合し、調整摘み１２，１
２′と支持部材８′，６′との間に押え用コイルス
プリング１３，１３を巻装して常時支持部材８′，
６′を押え、両保持部材２，２′間で被測定物１を
挾持するようになつている。 Further, a support member 8,
8' is fixed. And both support members 8,
8' and both supporting members 6, 6' are provided with guide shafts 9,
9' and insert the guide shaft 9, into one support member 8, 6.
9' is fixed, and the other supporting members 8', 6' can be moved closer to or farther away from the supporting members 8, 6 by the guidance of the guide shafts 9, 9'. and,
Adjustment threaded rods 10, 10' are attached to the center sides of both guide shafts 9, 9' in the height direction, respectively, on one of the supporting members 8', 9'.
6', and are screwed onto the other opposing support members 8 and 6, respectively, and fixed with locking nuts 11 and 11'.
Adjustment knobs 12, 12' are screwed onto the outer ends of both adjustment screw rods 10, 10', respectively.
Holding coil springs 13, 13 are wound between the supporting members 8', 2' and the supporting members 8', 6' at all times.
6', and the object to be measured 1 is held between the holding members 2, 2'.
尚、押え用コイルスプリング１３，１３と調整
摘み１２，１２′間には指示板１４が夫々介在し、
支持部材８′，６′の側面に固定した目盛板１５，
１５′に指示板１４の一端を移動自在に嵌合して
押え用コイルスプリング１３，１３の張力を指示
できるようになつている。 Note that an indicator plate 14 is interposed between the presser foot coil springs 13, 13 and the adjustment knobs 12, 12', respectively.
A scale plate 15 fixed to the side surface of the support members 8', 6',
One end of the indicator plate 14 is movably fitted to 15' so that the tension of the holding coil springs 13, 13 can be indicated.
前記、両保持部材２，２′には送波器１６と受
波器１６′とが夫々移動できるように装着してい
る。送受波器１６，１６′は同一構成なので、一
方の送波器１６についてのみ説明する。即ち、ア
クリル製の振動子保持部材１７の一端に振動子１
８を収納する筐体１９を着脱自在に取付け、振動
子保持部材１７の他端は前記保持部材２の円弧状
案内面４に密着して移動できるように円弧面２０
で形成し、振動子保持部材１７の上面に円弧状の
案内棒２１を有する案内支持板２２を突設し、こ
の案内支持板２２を保持部材２の上面に乗架し、
案内溝２１を通して保持部材２の上面に螺合した
２個のボルト２３，２３で振動子保持部材１７の
移動案内と固定を行うようになつている。 A wave transmitter 16 and a wave receiver 16' are movably mounted on both the holding members 2, 2'. Since the transducers 16 and 16' have the same configuration, only one of the transducers 16 will be described. That is, the vibrator 1 is attached to one end of the vibrator holding member 17 made of acrylic.
The other end of the vibrator holding member 17 has a circular arc surface 20 so that it can move in close contact with the circular guide surface 4 of the holding member 2.
A guide support plate 22 having an arc-shaped guide rod 21 is protruded from the upper surface of the vibrator holding member 17, and this guide support plate 22 is mounted on the upper surface of the holding member 2,
Two bolts 23, 23 screwed into the upper surface of the holding member 2 through the guide groove 21 guide the movement of the vibrator holding member 17 and fix it.
又、筐体１９の内部には振動子１８を押圧する
押圧板２４を設け、この押圧板２４に筐体１９に
螺合した締付ボルト２５の一端を回動自在に取付
け、締付ボルト２５に螺合した止ナツト２６で固
定するようになつている。そして、筐体１９の外
側にＬ字形をした副尺目盛盤２７を固定してい
る。 Further, a pressing plate 24 for pressing the vibrator 18 is provided inside the housing 19, and one end of a tightening bolt 25 screwed into the housing 19 is rotatably attached to this pressing plate 24. It is designed to be fixed with a locking nut 26 screwed into. An L-shaped vernier scale plate 27 is fixed to the outside of the casing 19.
本実施例は前記のように構成したもので、台盤
７上に支持部材６を固定し、支持部材６′を移動
できるように乗架する。この際、上下の案内軸
９，９′と上下の調整ネジ棒１０，１０′とにより
両保持部材２，２′の中心軸線Ｏ，Ｏは所定の軸
間距離Δlだけずらせて位置するようになつてい
る。そして、両保持面３，３に粘度の高い流体例
えばグリス等を塗布して接触を良好にして被測定
物１を両保持面３，３間に位置させ、支持部材
６′を台盤７上を移動させることにより被測定物
１を両保持面３，３で保持する。その後、両調整
摘み１２，１２′を回動させて締付けることによ
り押え用コイルスプリング１３，１３の作用で保
持部材２′を被測定物１側に強く押圧し、被測定
物１を両保持面３，３で強く挾持する。 The present embodiment is constructed as described above, and the support member 6 is fixed on the base plate 7, and the support member 6' is mounted so as to be movable. At this time, the center axes O, O of both holding members 2, 2' are positioned offset by a predetermined interaxial distance Δl by the upper and lower guide shafts 9, 9' and the upper and lower adjusting screw rods 10, 10'. It's summery. Then, by applying a high viscosity fluid such as grease to both the holding surfaces 3, 3 to make good contact, the object to be measured 1 is positioned between both the holding surfaces 3, 3, and the supporting member 6' is placed on the base plate 7. By moving the object to be measured 1, the object to be measured 1 is held by both holding surfaces 3, 3. Thereafter, by rotating and tightening both adjustment knobs 12 and 12', the holding member 2' is strongly pressed against the workpiece 1 side by the action of the holding coil springs 13 and 13, and the workpiece 1 is held on both holding surfaces. 3.Pinch firmly with 3.
第３図に示すように、音速測定式 cos θ2／C2＝cos θ1／C1が成立する。 As shown in FIG. 3, the sound velocity measurement formula cos θ 2 /C 2 =cos θ 1 /C 1 holds true.
但し、 ｄ：被測定物厚さ
Ｒ：保持部材半径
C1：被測定物音速
C2：保持部材音速
θ1：被測定物内傾斜角
θ2：保持部材内傾斜角
θ1は軸間距離Δlと被測定物厚さｄにより予めわ
かつており、保持部材音速C2も予めわかつてい
る。 However, d: Thickness of the object to be measured R: Radius of the holding member C 1 : Speed of sound in the object to be measured C 2 : Speed of sound in the holding member θ 1 : Angle of inclination within the object to be measured θ 2 : Angle of inclination within the holding member θ 1 is the distance between the axes It is predetermined by Δl and the thickness d of the object to be measured, and the holding member sound velocity C 2 is also known in advance.
被測定物中の横波音速は
C1（横波）＝C2×cos θ1／cos θ2′ ……(1)
被測定物中の縦波音速は
C1（縦波）＝C2×cos θ1／cos θ2″ ……(2)
したがつて、送波器１６及び受波器１６′を、
両ボルト２３，２３の案内で、保持部材２，２′
の円弧状案内面４に沿つて移動させ、送波器１６
と受波器１６′とにより音波の伝播時間と伝播減
衰を測定し、横波の測定に際しては第４図に示す
ように、音波減衰の最小となるθ2″を実測で求め、
横波の測定も同様に音波減衰が最少となるθ2′を
実測で求める。 The sound speed of the transverse wave in the object to be measured is C 1 (transverse wave) = C 2 × cos θ 1 / cos θ 2 ′ ...(1) The sound speed of longitudinal wave in the object to be measured is C 1 (longitudinal wave) = C 2 × cos θ 1 /cos θ 2 ″ ...(2) Therefore, the transmitter 16 and the receiver 16' are
The holding members 2, 2' are guided by both bolts 23, 23.
The transmitter 16 is moved along the arcuate guide surface 4 of
and receiver 16' to measure the propagation time and propagation attenuation of the sound wave, and when measuring transverse waves, as shown in Fig. 4, θ 2 '', which is the minimum of the sound wave attenuation, is determined by actual measurement.
Similarly, when measuring transverse waves, θ 2 ′ at which the sound wave attenuation is minimized is determined by actual measurement.
保持部材内傾斜角θ2を求め、(1)式及び(2)式から
縦波及び横波の被測定物１の音波を測定する。 The inclination angle θ 2 within the holding member is determined, and the longitudinal and transverse waves of the sound waves of the object to be measured 1 are measured from equations (1) and (2).
本発明においては送受波器を移動させて音波減
衰が最小となる角度を求めることにより、被測定
物を液中に浸すことなく簡単に音速を求めること
ができる。
In the present invention, the speed of sound can be easily determined without immersing the object to be measured in the liquid by moving the transducer and determining the angle at which the attenuation of the sound wave is minimized.
第１図は本発明に係る音速測定器の一実施例の
一部を切欠いた正面図、第２図は平面図、第３図
は説明図、第４図は減衰率と角度との関係図、第
５図は従来装置の説明図である。
１……被測定物、２，２′……保持部材、３…
…保持面、４……円弧状案内面、１６……送波
器、１６′……受波器、Ｏ……中心軸線。
Fig. 1 is a partially cutaway front view of an embodiment of the sound velocity measuring instrument according to the present invention, Fig. 2 is a plan view, Fig. 3 is an explanatory drawing, and Fig. 4 is a diagram of the relationship between attenuation rate and angle. , FIG. 5 is an explanatory diagram of a conventional device. 1...Object to be measured, 2, 2'...Holding member, 3...
...Holding surface, 4...Circular guide surface, 16... Wave transmitter, 16'... Wave receiver, O... Central axis line.
Claims (1)
て対向させ、保持面３で被測定物１を圧着し、中
心軸線を中心にした円弧状案内面４を保持面３の
反対側に設けた半円柱状の一対の保持部材２，
２′と、保持部材２，２′の円弧状案内面４に沿つ
て積動自在に設けた送波器１６と受波器１６′と
から成る音速測定器。1. The central axes O of the flat holding surfaces 3 are shifted to face each other, the object to be measured 1 is crimped on the holding surfaces 3, and an arc-shaped guide surface 4 centered on the central axes is provided on the opposite side of the holding surfaces 3. A pair of semi-cylindrical holding members 2,
2', and a wave transmitter 16 and a wave receiver 16' which are movably provided along the arcuate guide surfaces 4 of the holding members 2, 2'.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7846885A JPS61237023A (en) | 1985-04-15 | 1985-04-15 | Sound velocity measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7846885A JPS61237023A (en) | 1985-04-15 | 1985-04-15 | Sound velocity measuring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61237023A JPS61237023A (en) | 1986-10-22 |
| JPH0337129B2 true JPH0337129B2 (en) | 1991-06-04 |
Family
ID=13662851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7846885A Granted JPS61237023A (en) | 1985-04-15 | 1985-04-15 | Sound velocity measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61237023A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114485911B (en) * | 2022-01-25 | 2023-11-24 | 重庆医科大学 | Device and method for measuring acoustic attenuation coefficient in acoustic waveguide tube based on sub-wavelength scale |
-
1985
- 1985-04-15 JP JP7846885A patent/JPS61237023A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61237023A (en) | 1986-10-22 |
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