GB649518A - Improvements in or relating to supersonic transmitting apparatus - Google Patents
Improvements in or relating to supersonic transmitting apparatusInfo
- Publication number
- GB649518A GB649518A GB11573/47A GB1157347A GB649518A GB 649518 A GB649518 A GB 649518A GB 11573/47 A GB11573/47 A GB 11573/47A GB 1157347 A GB1157347 A GB 1157347A GB 649518 A GB649518 A GB 649518A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hammer
- primary
- spring
- striking
- oscilloscope
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
649,518. Testing materials by supersonic vibrations. SPERRY PRODUCTS, Inc. April 30, 1947, No. 11573. Convention date, May 10, 1946. [Class 106 (ii)] [Also in Group XXII] A vibrating apparatus for transmitting supersonic waves into an object to be tested comprises a primary hammer adapted to make firm contact with the object, and a secondary hammer connected to the primary hammer and having a mass substantially larger than the mass of the primary hammer, the length of the primary hammer in the direction of striking and the lateral dimensions thereof being small relative to the dimensions of the object but large relative to the wave length. Preferably the dimension of.the primary hammer in the direction of striking is equal to v/2f, where f is the desired frequency, and v is the velocity of the longitudinal waves in the hammer. As shown in Fig. 1, a primary hammer 10, adapted to strike the object 12, is connected by a spring 17 to a secondary hammer 11 which is rapidly reciprocated by electromagnetic means 50. The wave trains generated in the object are detected by a ring-shaped quartz crystal 15 connected through an amplifier 20 to an oscilloscope 25. The sweep circuit 27 for the oscilloscope is actuated each time the hammer 10 strikes the object. The proportions of the primary and secondary hammers and the connecting spring are designed to. generate wave trains of the required duration and frequency. Instead of a connecting spring 17, the hammer 10 may be joined to the hammer 11 by an integral neck portion. The striking face of the hammer 10 may be curved, and it may be grooved to allow trapped air to escape freely. In the form shown in Fig. 6, the hammer 10<SP>11</SP> has a stem 40 passing through an opening in the hammer 11<SP>11</SP> and connected with a flange 42. A spring 17<SP>1</SP> urges the two hammers apart. An anvil or intermediate member may be arranged between the hammer and the object to ensure plane wove fronts entering the object. The hammer may be reciprocated by pneumatic or other means.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US649518XA | 1946-05-10 | 1946-05-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB649518A true GB649518A (en) | 1951-01-31 |
Family
ID=22059329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11573/47A Expired GB649518A (en) | 1946-05-10 | 1947-04-30 | Improvements in or relating to supersonic transmitting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB649518A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1032946B (en) * | 1951-12-13 | 1958-06-26 | Kelvin And Hughes Ltd | Equipment for ultrasonic material testing |
| FR2471604A1 (en) * | 1979-12-07 | 1981-06-19 | Hoesch Estel Werke Ag | DYNAMIC ELECTROACOUSTIC TRANSDUCER |
| WO2001007905A1 (en) * | 1999-07-23 | 2001-02-01 | Honeywell Inc. | Acoustic fault injection tool |
-
1947
- 1947-04-30 GB GB11573/47A patent/GB649518A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1032946B (en) * | 1951-12-13 | 1958-06-26 | Kelvin And Hughes Ltd | Equipment for ultrasonic material testing |
| FR2471604A1 (en) * | 1979-12-07 | 1981-06-19 | Hoesch Estel Werke Ag | DYNAMIC ELECTROACOUSTIC TRANSDUCER |
| WO2001007905A1 (en) * | 1999-07-23 | 2001-02-01 | Honeywell Inc. | Acoustic fault injection tool |
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