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Expired
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Pilgrim House Group Ltd
Original Assignee
Ransome Hoffmann Pollard Ltd
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Application filed by Ransome Hoffmann Pollard LtdfiledCriticalRansome Hoffmann Pollard Ltd
Publication of GB1319053ApublicationCriticalpatent/GB1319053A/en
G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
G01H1/12—Measuring characteristics of vibrations in solids by using direct conduction to the detector of longitudinal or not specified vibrations
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Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
Measurement Of Mechanical Vibrations Or Ultrasonic Waves
(AREA)
Abstract
1319053 Vibration transducers RANSOME HOFFMANN POLLARD Ltd 4 June 1970 [28 May 1969] 26975/69 Heading H4J A transducer for converting mechanical vibrations of a body into electrical signals comprises a flat-ended probe 10 for contacting the body, which probe passes through a rubber grommet 6 to transmit the vibrations to a piezoelectric element 4. A spring 5, damped by a core of polyurethane foam material 9 is located by nylon bush 7 and boss 8 to urge the element 4 towards the probe 10. The transducer has a flat frequency response in the range from 50 Hz to 5 kHz, and can be used to measure the noise level in rotary bearings.