Method and device for operating an ultrasonic sensor
US5531118A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1994 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Oct 20, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2015/938
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and a device for operating an ultrasonic sensor, in which the measuring sensitivity is monitored and the measuring result is compensated for temperature. This is accomplished by measuring the distance of a fixed marking, which is situated on the vehicle and has a known distance from the ultrasonic sensor, to extract a signal, whose amplitude is a measure of the sensitivity of the ultrasonic sensor. From the measured delay time and the theoretical delay time to the marking, a value is attained, which is a measure of the temperature of the ambient air. Suited as a marking is, for example, an edge of a raised license plate frame, which is mounted on a bumper bar of a motor vehicle and lies within the detecting range of the ultrasonic sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.