Moving object detection system
US4187487A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1978 |
| Grant date | Feb 5, 1980 |
| Priority date | — |
| Expiry date | Apr 28, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/902
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention relates to a detection system for detecting presence of moving objects such as vehicles, etc. through utilization of ultrasonic energy which includes a predetermined location provided in memory unit and having stored therein time from transmission of ultrasonic energy till reception of reflected energy corresponding thereto from a road surface, circuitry for computing difference a between immediately preceding time from transmission of ultrasonic energy till reception of reflected energy corresponding thereto stored in the predetermined memory location and current time from transmission of ultrasonic energy and reception of reflected energy corresponding thereto, circuitry for storing in the predetermined memory location the current time from transmission of ultrasonic energy till reception of reflected energy corresponding thereto when the difference a is less than a predetermined time .alpha., and circuitry for outputting vehicle detection signal when the difference a is larger than a preset time .beta. which is larger than the time .alpha..
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.