GB641011A - Improvements in and relating to piezoelectric crystal holders - Google Patents

Improvements in and relating to piezoelectric crystal holders

Info

Publication number
GB641011A
GB641011A GB31340/47A GB3134047A GB641011A GB 641011 A GB641011 A GB 641011A GB 31340/47 A GB31340/47 A GB 31340/47A GB 3134047 A GB3134047 A GB 3134047A GB 641011 A GB641011 A GB 641011A
Authority
GB
United Kingdom
Prior art keywords
crystal
aperture
nov
spring
testing
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
Application number
GB31340/47A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB641011A publication Critical patent/GB641011A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • G10K9/22—Mountings; Casings

Abstract

641,011. Supersonic inspection devices. BRITISH THOMSON-HOUSTON CO., Ltd. Nov. 26, 1947, No. 31340. Convention date, Nov. 26, 1946. [Class 118 (ii)] [Also in Group XXXIX] A piezo-electric crystal holder suitable for use in testing a conductive solid material 6 for the presence of internal defects by supersonic energy comprises a metallic cylindrical casing 1., 3 with a circular aperture 2 in the end which is held in contact with the material and means for mounting the crystal 19 in the aperture by a spring support so that the pressure between the crystal and the material is maintained constant. The crystal is mounted on a metal plate 20 attached to a piston-like dielectric annular disc 21, the assembly being urged towards the aperture by a compressed spiral spring 23 one end of which bears on the metal plate 20 and the other end being seated in a metallic dish 12 mounted on the end of a hollow cylindrical dielectric member 9. The spring also serves to make an electrical series connection between the crystal and an inductance coil 8, the inductance being adjusted to resonate with the crystal by the adjustable brass or powdered-iron core 13. The low impedance of the series resonant combination enables it to be matched to a coaxial line feeder coupled to the connector 11 and the voltage applied to the crystal will be greater than the line voltage. The outer surface of the crystal is connected to the outer conductor of the connector via the material 6 and casing 1, 3. When using the pulse method of testing, a D.C. waveform as shown in Fig. 2 is applied to the coaxial line to produce recurrent damped wave trains, Fig. 3.
GB31340/47A 1946-11-26 1947-11-26 Improvements in and relating to piezoelectric crystal holders Expired GB641011A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US712266A US2488290A (en) 1946-11-26 1946-11-26 Piezoelectric crystal holder

Publications (1)

Publication Number Publication Date
GB641011A true GB641011A (en) 1950-08-02

Family

ID=24861409

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31340/47A Expired GB641011A (en) 1946-11-26 1947-11-26 Improvements in and relating to piezoelectric crystal holders

Country Status (2)

Country Link
US (1) US2488290A (en)
GB (1) GB641011A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725547A (en) * 1951-04-13 1955-11-29 Raytheon Mfg Co Transducer exciting circuits
US2920192A (en) * 1953-11-23 1960-01-05 Gen Dynamics Corp Pulse generator
US2963597A (en) * 1957-01-02 1960-12-06 Eduard A Gerber Means for compensating the static capacitance of piezo-electric crystals
US3019637A (en) * 1959-03-24 1962-02-06 Curtiss Wright Corp Ultrasonic testing arrangement
US3268855A (en) * 1963-03-19 1966-08-23 Electro Voice Ultrasonic microphone
US3843898A (en) * 1972-10-27 1974-10-22 Vernitron Corp Piezoelectric mounting with variable damping
US3921441A (en) * 1973-11-13 1975-11-25 Boris Vasilievich Tomilov Acoustic head
US4945898A (en) * 1989-07-12 1990-08-07 Diasonics, Inc. Power supply
US5065761A (en) * 1989-07-12 1991-11-19 Diasonics, Inc. Lithotripsy system
EP2241502B1 (en) * 2009-04-13 2017-03-08 Sikorsky Aircraft Corporation Active vibration suppression via power minimization

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1756000A (en) * 1925-09-10 1930-04-22 John M Miller Piezo-electric oscillation generator
US1994228A (en) * 1931-02-19 1935-03-12 Telefunken Gmbh Temperature control of piezo-electric crystal apparatus
US2083420A (en) * 1936-03-27 1937-06-08 Electrical Res Prod Inc Coupling means for piezoelectric crystal elements
FR957164A (en) * 1944-04-21 1950-02-16

Also Published As

Publication number Publication date
US2488290A (en) 1949-11-15

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