4,287,581

43.35.Yb ULTRASONIC FLUID LEAK DETECTOR

Dory J. Neale, Sr., Saint Petersburg, Florida 1 September 1981 {Class 367/135}; filed 19 February'1980

Leaking gas, particularly from a communication cable, is detected by its ultrasonic noise in a narrow band centered at 40 kHz. This hand-held

instrument, with a directional ultrasonic microphone in the barrel 38, indicates a noise signal both by a meter 8, and by a loudspeaker 40. When

45

•? 40

the switch 42 is at the position A, the loudspeaker presents the audio frequency envelope of the ultrasonic noise. When it is at position T, a circuit is triggered into oscillation if the ultrasonic noise signal exceeds a certain threshold, and the loudspeaker presents an audible tone at the frequency of that oscillation.--LB

4,311,052

43.35.Yb ULTRASONIC CONTROL CONTOUR FOL- LOWER

Nathaniel B. Jeffras and Donald R. Modispacher, assignors to Automation Industries, Incorporated

19 January 1982 (Class 73/634}; filed 11 January 1979

An automated ultrasonic flow detection tester is described in which

ultrasonic sensors provide not only signals showing the properties of the material being tested, but also position information of the sensors relative to the material surfaces. This position information is used to control an automated scanning mechanism such that the sensors are maintained at fixed separations from the material surfaces during rapid contour follow- ing. The apparatus is useful for scanning stepped or tapered parts, airfoils, antenna dishes, etc.--JVB

4,311,540

43.35.Yb ULTRASONIC BONDING PROCESS

Berlie R. Hill, assignor to Burlington Industries Incorporated 19 January 1982 (Class 156/73.1); filed 1 May 1980

This patent relates to an improvement in the forming of nonwoven fabric from batts of random, loose thermoplastic fibers. Prior methods are said to suffer from one or more of the following limitations: unacceptable fabric properties (especially strength in hand); slow processing speeds: equipment malfunction due to burn up of the anvil roller, should the bart break or cease to be fed between the horn and the roller, or should scrap metal inadvertently appear in the bart. All of these drawbacks are said to be solved by utilizing a nonthermoplastic carrier of flexible sheet material capable of drawing and spreading out ultrasonic energy, and passing the carrier and bart together between the horn and anvil of the machine.-- JVB

4,312,231

43.35.Yb APPARATUS FOR GENERATING AND DE-

TECTING AN ELECTROMAGNETIC ULTRASONIC WAVE

Katsuhiro Kawashima, Shoji Murota, Yukio Nakamori, and Hisao Suzuki, assignors to Nippin Steel Corporation and Mit- subishi Denki Kabushiki Kaisha

26 January 1982 (Class 73/643); filed 6 July 1979

An improvement in apparatus for generating and detecting an elec- tromagnetically generated ultrasonic wave, applicable for ultrasonic in- spection through unfavorable surface conditions such as the presence of rust or under high temperature conditions. In such apparatus, a magnetic field generator forms a magnetic field at the surface area of one side of a conductive material, and an eddy current and impulse of a magnetic field are produced in the surface area by supplying a high-frequency current pulse to an ultrasonic wave generating coil, the interaction therebetween producing an ultrasonic wave which travels in the conductive material. The eddy current resulting from the interaction between the formed mag- netic field and a reflected ultrasonic wave being reflected by another side of the conductive material or the internal defect contained therein is de-

tected by a detecting coil which is electromagnetically separated from the ultrasonic wave generating coil by a decoupling means.--JVB

4,297,872

43.40.Rj VIBRATION TYPE TRANSDUCER Kyoichi Ikeda and Motoyoshi Ando, assignors to Yokogawa

Electric Works, Ltd. 3 November 1981 (Class 73/32 A); filed in Japan 11 January

1979 •

This patent relates to a transducer for evaluating various physical quantities (e.g., pressure, temperature, density) of a fluid introduced around a vibrating element. The element is driven in one or more vibration modes, and its modal frequency changes resulting from fluid changes are analyzed by means of appropriate circuits to yield the desired fluid param- eter values.--EEU

4,296,839

43.40.Tm STRUCTURALLY DAMPED BOLT

Robert C. Peller and Jack E. Dyer, assignors to General Dyna- mics Corporation

27 October 1981 (Class 188/378); filed 26 September 1979

This bolt includes sleeves 30 and 32 rigidly attached to bosses 28 at the two ends of the primary load-carrying member 12. Viscoelastic mate- ria136 between the two sleeves shears as the bolt is subjected to axial loads,

and thus dissipates energy. The invention is claimed to be particularly useful for supporting optical devices, which have stringent alignment re- quirements, in situations where greater than usual damping is desired.-- EEU

303 J. Acaust. Sac. Am. 72(1), July 1982; 0001-4966/82/070303-01500.80; ¸ 1982 Acoust. Sac. Am.; Patent Reviews 303

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