Ultrasonic velocity sensor

Details Ultrasonic velocity sensor Ultrasonic velocity sensor

G - Physics

01

S

349/34

G01S 15/60 (2006.01) G01S 7/52 (2006.01) G01S 7/521 (2006.01) G01S 7/523 (2006.01) G01S 15/62 (2006.01) G01S 7/527 (2006.01)

Patent

CA 1319970

ABSTRACT An ultrasonic ground speed sensor has a single transducer which both transmits and receives ultrasonic signals. The sensor is mounted on a vehicle in align- ment with the direction of the vehicle, the transducer having a built-in angle with the body of the sensor unit. The transmitted signal is clocked by a 16 MHz clock, with the signal received by the transducer selec- tively filtered and amplified. A temperature sensor is also used to determine the speed of the transmitted and received signal. A 64-cycle sample period is used, as well as multiple counters and a signal processor to increase accuracy and minimize erroneous readings. A drop-out detector and monitoring system sensor is also described. The vehicle speed is calculated from a Doppler-based formula as a function of both the sum and difference of the transmitted and received signal fre- quencies. Also disclosed is a gasket seal having leak holes for drainage from the interior of the sensor.

616274

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