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Echo-sounding: Pulse discriminating circuits
energy 5bliquely into the workpiece surface, a spaced t r a n s d u c e r for receiving ultrasonic energy r e - r a d i a t ed normally to the surface f r o m within the workpiece, and a device for scanning the t r a n s d u c e r s over the surface. Ultrasonic inspection d e v i c e s producing oscillations Netherlands Organisation for Applied Scientific R e s e a r c h on behalf of Public Health British Patent 1,204, 258 (1970)
Ultrasonic inspection devices: transistor gating circuits Automation Industries Inc British Patent 1,204, 737 (1970) Echo-sounding: lmlse discriminating c i r c u i t s F r i e d Krupp GmbH British Patent 1,204, 939 (1970)
Sonar systems Sharp, F. A., Bentley, B. A., Buckingham, J. British Patent i, 205, 921 (1970) An acoustic window to protect Asdic and similar transducers from disturbances in a surrounding liquid consists of adjacent sheets of a material impermeable to the liquid and a material of greater tensile strength,the former being nearer the transducer. The impermeable sheet is pressed against the outer sheet by liquid pressure derived from a tank. Acoustic detection and guidance device: subaqueous
signalling Pendrick, A. P. British Patent 1,206, 580 (1970) A cable for use under water has a regular a r r a n g e ment of sonar pulse t r a n s d u c e r s spaced along its length. It may be used in conjunction with r e c e i v e r s on a ship to guide the ship on a given course, and for submarine detection. The t r a n s d u c e r s may be emitt e r s or r e c e i v e r s or both. Piezoelectric transformers Matsushita E l e c t r i c Industrial Co Ltd British Patent 1,207, 266 (1970) Ultrasonic inspection devices Statni Vyzkummy Ustav P r o Stavbu Stroju British Patent 1, 207, 385 (1970) In an ultrasonic pulse-echo s y s t e m for inspecting a rod moved axially relative to several probes disposed in a p l a n e normal to the rod axis, t h r e e - d i m e n sional and two-dimensional flaws are distinguished on the basis that the three-dimensional flaws r e t u r n echoes to m o r e probes than do the two-dimensional flaws.
A method for testing f e r r i t e m e m o r y c o r e s etc for flaws involves vibrating the core by subjecting it to ultrasonic waves f r o m a dynamic speaker swept through a frequency range including the anticipated resonant frequency of a sound (flawless) core. Mechanical resonance is detected and c o r e s with r e sonances outside the tolerance range a r e rejected. Measuring dZm,maions ultrasonically Compagnie Generale d ' E l e c t r i c i t e British Patent 1,210, 017 (1970) A dimension of a body cavity is m e a s u r e d by an u l t r a sonic pulse-echo method using a catheter which c a r ries at its end two plates functioning as piezoelectric t r a n s d u c e r s and connected to respective electrical leads within the catheter. Aerials: position-finding by sound waves Koden Seisakusho KK British Patent 1,210, 087 (1970) The invention may be applied to the receiving section of an ultrasonic pulse-echo apparatus affording a type B cathode ray tube display. Piezoelectric transducers Ohio State University British Patent 1,210, 392 (1970) Ultrasonic fluid flowmeter Compagnie Generale d ' E l e c t r i c i t e British Patent 1,210, 476 (1970) In an ultrasonic pulse-echo s y s t e m for recording the magnitude and direction of variations in the volume flow rate of fluid in a conduit, a single t r a n s d u c e r is used to m e a s u r e the time between an echo from one surface of the conduit and one from an opposed s u r face, and to m e a s u r e the Doppler frequency deviation undergone by an echo from fluid constituents. The time and deviation are used to derive the instantaneous volume flow rate. Ultrasonic inspection devices: ultrasonic probes Hitachi Ltd and Hitachi Metals Ltd British Patent 1,211,306 (1970) In apparatus for measuring the depth of a boundary within a specimen by the ultrasonic pulse-echo method, provision is made for adjusting the magnitude of echo signals reflected to a r e c e i v e r f r o m the specimen surface independently of the magnitude of boundary echo signals. Echo sounders Marconi Sounding Device Co Ltd British Patent 1,212, 016 (1970)
Ultrasonic inspection devices: s e m i - c o n d e c t o r tmlse circuits Magnaflux Corp British Patent 1,208, 017 (1970)
Sonar s y s t e m Philips Electronic & Associated Industries Ltd British Patent 1,212, 106 (1970)
Acoustic holography: x - r a y apparatus Texas I n s t r u m e n t s Inc British Patent 1,208,586 (1970)
Echo SOmdln~ F r i e d Krupp GmbH British Patent 1,212, 108 (1970)
Acoustic inspection devices International Business Machines Corp British Patent 1,209, 260 (1970)
Ultrasonic inspection devices: diode gating c i r c u i t s Brown, T. G. British Patent I, 212, 349 (1970) ULTRASONICS April 1971
127
Ultrasonic inspection devices: transistor gating circuits Automation Industries Inc British Patent 1,204, 737 (1970) Echo-sounding: lmlse discriminating c i r c u i t s F r i e d Krupp GmbH British Patent 1,204, 939 (1970)
Sonar systems Sharp, F. A., Bentley, B. A., Buckingham, J. British Patent i, 205, 921 (1970) An acoustic window to protect Asdic and similar transducers from disturbances in a surrounding liquid consists of adjacent sheets of a material impermeable to the liquid and a material of greater tensile strength,the former being nearer the transducer. The impermeable sheet is pressed against the outer sheet by liquid pressure derived from a tank. Acoustic detection and guidance device: subaqueous
signalling Pendrick, A. P. British Patent 1,206, 580 (1970) A cable for use under water has a regular a r r a n g e ment of sonar pulse t r a n s d u c e r s spaced along its length. It may be used in conjunction with r e c e i v e r s on a ship to guide the ship on a given course, and for submarine detection. The t r a n s d u c e r s may be emitt e r s or r e c e i v e r s or both. Piezoelectric transformers Matsushita E l e c t r i c Industrial Co Ltd British Patent 1,207, 266 (1970) Ultrasonic inspection devices Statni Vyzkummy Ustav P r o Stavbu Stroju British Patent 1, 207, 385 (1970) In an ultrasonic pulse-echo s y s t e m for inspecting a rod moved axially relative to several probes disposed in a p l a n e normal to the rod axis, t h r e e - d i m e n sional and two-dimensional flaws are distinguished on the basis that the three-dimensional flaws r e t u r n echoes to m o r e probes than do the two-dimensional flaws.
A method for testing f e r r i t e m e m o r y c o r e s etc for flaws involves vibrating the core by subjecting it to ultrasonic waves f r o m a dynamic speaker swept through a frequency range including the anticipated resonant frequency of a sound (flawless) core. Mechanical resonance is detected and c o r e s with r e sonances outside the tolerance range a r e rejected. Measuring dZm,maions ultrasonically Compagnie Generale d ' E l e c t r i c i t e British Patent 1,210, 017 (1970) A dimension of a body cavity is m e a s u r e d by an u l t r a sonic pulse-echo method using a catheter which c a r ries at its end two plates functioning as piezoelectric t r a n s d u c e r s and connected to respective electrical leads within the catheter. Aerials: position-finding by sound waves Koden Seisakusho KK British Patent 1,210, 087 (1970) The invention may be applied to the receiving section of an ultrasonic pulse-echo apparatus affording a type B cathode ray tube display. Piezoelectric transducers Ohio State University British Patent 1,210, 392 (1970) Ultrasonic fluid flowmeter Compagnie Generale d ' E l e c t r i c i t e British Patent 1,210, 476 (1970) In an ultrasonic pulse-echo s y s t e m for recording the magnitude and direction of variations in the volume flow rate of fluid in a conduit, a single t r a n s d u c e r is used to m e a s u r e the time between an echo from one surface of the conduit and one from an opposed s u r face, and to m e a s u r e the Doppler frequency deviation undergone by an echo from fluid constituents. The time and deviation are used to derive the instantaneous volume flow rate. Ultrasonic inspection devices: ultrasonic probes Hitachi Ltd and Hitachi Metals Ltd British Patent 1,211,306 (1970) In apparatus for measuring the depth of a boundary within a specimen by the ultrasonic pulse-echo method, provision is made for adjusting the magnitude of echo signals reflected to a r e c e i v e r f r o m the specimen surface independently of the magnitude of boundary echo signals. Echo sounders Marconi Sounding Device Co Ltd British Patent 1,212, 016 (1970)
Ultrasonic inspection devices: s e m i - c o n d e c t o r tmlse circuits Magnaflux Corp British Patent 1,208, 017 (1970)
Sonar s y s t e m Philips Electronic & Associated Industries Ltd British Patent 1,212, 106 (1970)
Acoustic holography: x - r a y apparatus Texas I n s t r u m e n t s Inc British Patent 1,208,586 (1970)
Echo SOmdln~ F r i e d Krupp GmbH British Patent 1,212, 108 (1970)
Acoustic inspection devices International Business Machines Corp British Patent 1,209, 260 (1970)
Ultrasonic inspection devices: diode gating c i r c u i t s Brown, T. G. British Patent I, 212, 349 (1970) ULTRASONICS April 1971
127