Ultrasonic distance measuring circuit
US4276622A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1979 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | Jul 16, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S11/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An output distance signal related to the distance between an ultrasonic transmitting transducer and an ultrasonic receiving transducer is provided by an apparatus including a reference oscillator and a burst generator responsive to the reference oscillator which periodically generates ultrasonic burst signals. The ultrasonic transmitting transducer is responsive to the generator for providing an ultrasonic acoustic energy burst in response to each of the ultrasonic burst signals. An ultrasonic receiving transducer receives the ultrasonic acoustic energy bursts and generates detection signals in response thereto. A range window circuit is responsive to detection of an acoustic energy burst by the receiving transducer, for providing a range window signal at a time period lagging the detection signal such that a range gate will be opened for passage of the next following detection signal. A converter is responsive to the range gate and to the burst signals for providing an output distance signal, related in potential to the distance between the transmitting and receiving transducers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.