Electromechanical delay lines

Electromechanical delay lines

U l t r a s o n i c couplings C avitron Corp British Patent 1,215, 881 (1970) Filed 15 Jan 1968 Apparatus for r e m o v i n g unwanted m a t e r i a l...

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U l t r a s o n i c couplings C avitron Corp British Patent 1,215, 881 (1970) Filed 15 Jan 1968 Apparatus for r e m o v i n g unwanted m a t e r i a l (eg animal tissue) f r o m an enclosed a r e a c o m p r i s e s a casing in which is mounted m e a n s for applying high-frequency v i b r a t i o n s of minute anapUtude to the unwanted m a t e r i a l to disintegrate it. The casing contains two p a s s a g e s for the supply and r e m o v a l of a bathing liquid. The a p p a r a t u s can be used for eye c a t a r a c t operations. Semi-conductor transducers Matsushita Electric Industrial Co Ltd British Patent 1, 216, 005 (1970) Filed 7 March 1968 A surface region of an etectromechanical transducer is doped with deep level impurities and provided w R h a metal layer forming a rectifying contact with the region.

Generating a c o u s t i c w a v e s Soc Nationals des P e t r o l e s d'Aquitaine B r i t i s h Patent 1,216, 488 (1970) Filed 22 Dec 1967 F o r s e i s m i c exploration on land, s p a r k gaps are located in a w a t e r - f i l l e d cavity in the ground; for marine s e i s m i c exploration they a r e supported by a ship. One or m o r e geophones detect the s u b s u r f a c e r e f l e c t i o n s of the acoustic wave, and their outputs are r e c o r d e d for subsequent signal p r o c e s s i n g . Ultrasonic thickness measurement system Magnaflux Corp B r i t i s h Patent 1,216, 511 (1970) Filed 5 Jan 1968 The thickness of a workpiece is determined f r o m the duration of an output signal f r o m a digital counter, the signal p e r s i s t i n g for the interval between two selected echo pulses of a s e r i e s produced by multiple r e f l e c t i o n of an u l t r a s o n i c pulse between the s u r f a c e s and applied to the counter. In an embodiment, a t r a n s d u c e r launches a pulse through water couplant and applies the resulting train of echoes to a gate.

r e c o r d e r w h e r e b y s e v e r a l s u p e r i m p o s e d synchronized r e c o r d i n g s are made on a c a r r i e r of magnetizable material. Pulse generators: pulse modulation circuits Commissariat a l'Energie Atomique B r i t i s h Patent 1,216, 755 (1970) Filed 15 Jan 1968

Acoustic temperature sensor Bendix Corp B r i t i s h Patents 1,216, 913 (1970) and 1, 219, 047 (1971) Filed 30 April 1968 An apparatus for sensing a variable condition of a r e l a t i v e l y high p r e s s u r e fluid in a chamber c o m p r i s e s pure fluid means generating p r e s s u r e - o s c i l l a t i o n s of p r e d e t e r m i n e d frequency which propagate through the high p r e s s u r e fluid; pure fluid and sound-receiving m e a n s located in the c h a m b e r and adapted to r e s o n a t e at the p r e d e t e r m i n e d frequency to produce c o r r e s ponding output signals; and pure fluid valve means r e s p o n s i v e to the output signals for generating an output p r e s s u r e r e p r e s e n t a t i v e of the condition to be sensed. E l e c t r o m e c h a n i c a l delay lines Philips E l e c t r o n i c & Associated Industries Lid British Patent 1,218, 783 (1971) Filed 10 July 1968 An acoustic delay line has a delay medium which is a silica glass with certain other additives. Acoustic shear waves propagate in the glass between 28003500ms -1, depending on the composition. U l t r a s o n i c thickness m e a s u r e m e n t : u l t r a s o n i c couplings South African Inventions Development Corp British Patent 1, 219, 290 (1971) Filed 19 June 1968 Thin film deposition on a substrate is monitored by detecting changes in the velocity of an ultrasonic surface wave t r a n s m i t t e d along the film a n d / o r the substrate s u r f a c e on which the film is deposited. The t r a n s d u c e r a s s e m b l y c o m p r i s e s an X-cut quartz c r y s t a l cemented to a damping block and to a coupling m e m b e r in the f o r m of a comb.

U l t r a s o n i c inspection devices: local viewing Akademiet For De Tekniske Videnskaber Svej secenttalon British Patent 1, 216, 753 (1970) Filed 11 Jan 1968

T i m e expansion of signals: echo sounding Simonsen & Mustad AS British Patent 1,219,435 (1971) Filed 14 Aug 1968

A r e c o r d of a complete c r o s s - s e c t i o n of a body being scanned by an u l t r a s o n i c probe is built up as the scanning p r o c e e d s by applying echo signals to a video

Echo sounding t r a n s d u c e r Simonsen & Mustad AS B r i t i s h Patent 1, 218, 220 (1971) Filed 22 May 1968

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PRI~ r by Unwin B r o t h e r s L i m i t e d , The G r e s h a m P r e s s , Old W o k i n g , S u r r e y , Engl~.nd