Distance measurement method making use of electromagnetic wave and system therefor
US4744040A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1986 |
| Grant date | May 10, 1988 |
| Priority date | — |
| Expiry date | Dec 19, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method an apparatus for measuring the distance to a target wherein FM wave is transmitted to the target and its reflected wave is received. A beat wave is then obtained using the thus-received wave and the FM wave. A sine wave is mixed with the beat wave and a first sideband wave of a plurality of sideband waves of the resultant mixed wave is obtained. Another sine wave is mixed with the sideband wave. Then, a second sideband wave of the thus-obtained mixed wave is separated and detected. In the above manner, phase modulation is applied directly to the above-described beat wave. Information pertaining to distance can then be obtained from the number of peaks of the thus-modulated beat wave. A microwave profile meter suitable for use in the determination of the surface profile of a burden in a blast furnace is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.