Pattern comparison ultrasonic surveillance system with noise suppression
US4499564A · kind A · utility
19Cited by
9References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 7, 1982 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Jan 7, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/526
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic surveillance system which emits pulse-like ultrasonic waves to an area under surveillance, which statistically compares a reflected-wave pattern established by receiving ultrasonic waves reflected from the under surveillance with a predetermined reference pattern, and which produces an alarm signal when these two patterns are not in agreement. According to this system, the alarm signal is prevented from being erroneously produced by ultrasonic noises.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.