Measuring and testing – Instrument casing
Patent
1988-11-28
1990-07-24
Williams, Hezron E.
Measuring and testing
Instrument casing
73493, G01L 1914
Patent
active
049427652
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 alignment 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 selectively 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 frequencies. Also disclosed is a gasket seal having leak holes for drainage from the interior of the sensor.
REFERENCES:
patent: 3696729 (1972-10-01), Chabala et al.
patent: 4728954 (1988-03-01), Phelan et al.
Hiniker Thomas K.
Tofte Semor D.
Arana Louis M.
Micro-Trak Systems, Inc.
Williams Hezron E.
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