GB796418A - Improvements relating to transducers - Google Patents
Improvements relating to transducersInfo
- Publication number
- GB796418A GB796418A GB1951355A GB1951355A GB796418A GB 796418 A GB796418 A GB 796418A GB 1951355 A GB1951355 A GB 1951355A GB 1951355 A GB1951355 A GB 1951355A GB 796418 A GB796418 A GB 796418A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transducer
- elements
- acoustically
- length
- oil
- 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
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 abstract 1
- 229910002113 barium titanate Inorganic materials 0.000 abstract 1
- 239000007799 cork Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000011664 signaling Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
796,418. Piezo-electric instruments. BRUSH CRYSTAL CO., Ltd. (Clevite Corporation). July 6, 1955, No. 19513/55. Class 40 (4). [Also in Group XL (b)] In a transducer for sub-aqueous signalling comprising a hollow cylinder 10, Fig. 1, of electromechanically sensitive material, e.g. barium titanate, the outer surface is acoustically coupled to the liquid medium 13 and the inner surface is shielded therefrom by plugging the open ends with cork or rubber. The mathematics of oscillation are discussed with reference to equivalent circuits, Figs. 3-5 (not shown). and the efficiency is shown to be a maximum when 1-K<SP>2</SP>/K<SP>2</SP> x Wr. Cm/A is a minimum. Where K = the dielectric constant, Wr = 2 # times the resonant frequency, Cm = the volume compliance, and A = the cross-sectional area of the cylinder. The variations of efficiency with changes in the ratio of thickness to diameter for different dielectric loss factors are described with reference to Fig. 6 (not shown) and the effect of length on the frequency response is discussed with reference to Figs. 8 and 9 (not shown). The transducer, Fig. 10, in which three cylindrical elements 30-32 are assembled on a rod 33 and separated by rubber washers 38-41 is stated to give a flat response up to 40 kc/s. The elements which are clamped between end pieces 36, 37, and may be connected in series or parallel, preferably have a length not greater than half their circumference. The directional lobe of a transducer of the type shown in Fig. 10 is sharpened as the overall length is increased and in a modification, Fig. 11, elements 50, 51 are spacedly mounted on a metallic tube 53 by means of metal rings 54 and rubber washers 57. The assembly is mounted in an acoustically transparent tube 67 and the device is oil filled, holes 70-73 allowing free access of the oil to all parts of the device. A layer 74 acoustically shields the inner surfaces of the cylinders from the oil pressure. Specification 754,501, [Group XL (b)], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1951355A GB796418A (en) | 1955-07-06 | 1955-07-06 | Improvements relating to transducers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1951355A GB796418A (en) | 1955-07-06 | 1955-07-06 | Improvements relating to transducers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB796418A true GB796418A (en) | 1958-06-11 |
Family
ID=10130640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1951355A Expired GB796418A (en) | 1955-07-06 | 1955-07-06 | Improvements relating to transducers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB796418A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2123602A (en) * | 1982-07-06 | 1984-02-01 | Raytheon Co | Piezoelectric transducer and method of making same |
| US5024872A (en) * | 1986-02-27 | 1991-06-18 | Raytheon Company | Sheets of stretched and polarized polymer materials and method of manufacturer |
-
1955
- 1955-07-06 GB GB1951355A patent/GB796418A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2123602A (en) * | 1982-07-06 | 1984-02-01 | Raytheon Co | Piezoelectric transducer and method of making same |
| US5024872A (en) * | 1986-02-27 | 1991-06-18 | Raytheon Company | Sheets of stretched and polarized polymer materials and method of manufacturer |
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