发明名称 |
Ultrasonic velocity sensor |
摘要 |
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.
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申请公布号 |
US4942558(A) |
申请公布日期 |
1990.07.17 |
申请号 |
US19880175777 |
申请日期 |
1988.03.31 |
申请人 |
MICRO-TRAK SYSTEMS, INC. |
发明人 |
HINIKER, THOMAS K.;TOFTE, SEMOR D. |
分类号 |
G01S7/52;G01S7/521;G01S7/523;G01S7/527;G01S15/60 |
主分类号 |
G01S7/52 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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