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Tuning Apparatus for Ultrasonic Velocity Transformer

IP.com Disclosure Number: IPCOM000090373D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

O'Hara, DJ: AUTHOR

Abstract

Ultrasonic velocity transformers can be tuned to their resonant length by this system which senses radial stress. Since the longitudinal displacement is at a maximum at both ends of the transformer when the transformer is an exact half wavelength or multiple of the half wave, the transformer can be built with some additional length and the resonant length determined. Transducer 1 longitudinally displaces transformer 2 at the desired resonant frequency of the transformer. The radial stress in the transformer is transmitted through blunt nose metal device 3 to an accelerometer 4 attached to it. Shock mounting 5 connects the metal device to air cylinder 6 or other pressure device which provides constant contact between the transformer and metal device independent of radial displacement.

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Tuning Apparatus for Ultrasonic Velocity Transformer

Ultrasonic velocity transformers can be tuned to their resonant length by this system which senses radial stress. Since the longitudinal displacement is at a maximum at both ends of the transformer when the transformer is an exact half wavelength or multiple of the half wave, the transformer can be built with some additional length and the resonant length determined. Transducer 1 longitudinally displaces transformer 2 at the desired resonant frequency of the transformer. The radial stress in the transformer is transmitted through blunt nose metal device 3 to an accelerometer 4 attached to it. Shock mounting 5 connects the metal device to air cylinder 6 or other pressure device which provides constant contact between the transformer and metal device independent of radial displacement. The stress measuring device is moved parallel to the transformer by slide 7 which actuates linear potentiometer 8. The output from potentiometer 8 moves the pen of an X-Y recorder 9 in the X direction. The stress signal from the accelerometer is amplified and rectified as at 10 prior to being fed to the Y line of recorder 9. The chart readings are employed to tune the transformer to the resonant frequency.

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