Measuring and testing – Vibration – By mechanical waves
Patent
1993-06-14
1995-08-29
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73 405A, 73587, G01N 2900, G01H 100
Patent
active
054450268
ABSTRACT:
An acoustic signal and sound diagnostic instrument, for use by a professional automotive engine or industrial machinery maintenance operator, which is capable of locating and discriminating automotive engine and industrial machinery abnormalities. The instrument includes an acoustic transducer microphone, located at the forward end of an elongated deformable, semi-rigid probe arm, for detecting and converting acoustic signals and sounds into electromagnetic signals and an electronics housing conformed to be held in the hand of the maintenance operator with the housing mechanically supporting the probe arm at its rearward end. Pre-amplifier circuitry within the housing is electrically coupled to the transducer microphone and to range selector circuitry for selecting sound level ranges respecting the electromagnetic signals. A decibel meter, mounted to the exterior of the housing, is electrically interconnected to the pre-amplifier for visually indicating changes and peaks in the sound levels detected by the transducer microphone. Operational audio amplifier circuitry within the housing is electrically interconnected to the pre-amplifier circuitry for converting the electromagnetic signals into secondary acoustic signals that may be listened to by the operator through an earphone headset electrically interconnected to the audio amplifier. The instrument is energized by a battery power supply contained within the housing.
REFERENCES:
patent: 2008934 (1935-07-01), Smith
patent: 2396935 (1946-03-01), Walstrom
patent: 4287581 (1981-09-01), Neale, Sr.
McGraw-Hill Encyclopedia of Science & Technology, 1977, V. 12, p. 202 & V. 12, pp. 575-576.
A E International, "LD-180 Portable, Highly Sensitive and Highly Accurate Leak Detector" Sep. 1992.
Physical Acoustics Corp., "5100 Series Leak Monitoring & Detection Systems", 1984.
Junkins Philip D.
Oda Christine K.
Williams Hezron E.
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