Ultrasonic rotational speed sensor

Details Ultrasonic rotational speed sensor Ultrasonic rotational speed sensor

1990-09-20

1992-03-24

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73627, 73162, 324175, 367 89, G01M 1302

Patent

active

050977083

ABSTRACT:
An ultrasonic rotational speed sensor in which all of the various electronic devices of the sensor are arranged compactly on one side of a rotational member to be measured, while maintaining a high precision in a rotational speed measurement. In this sensor, the transmitter microphone and the receiver microphone as well as other electronic devices associated with them are arranged on the same one side of the rotational member, where the rotational speed of the rotational member is determined from a period of the ultrasonic signals transmitted from the transmitter microphone, reflected at non-notch portions of the rotational member, and received by the receiving microphone, while a direct transmission from the transmitter microphone to the receiver microphone without an interaction with the rotational member is prevented by the use of a high frequency ultrasonic signals at MHz level.

REFERENCES:
patent: 3395342 (1968-07-01), Pounds
patent: 3846701 (1974-11-01), Sampey
patent: 4037157 (1977-07-01), Campbell
patent: 4259637 (1981-03-01), Bloomfield et al.
patent: 4650955 (1987-03-01), Tokunaga et al.

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