Cloud height measuring device with compensation for window fouling
US4605302A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1984 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Apr 16, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2007/4975
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a cloud height measuring device, the attenuation caused by deposits on the output and/or receiver windows of the device (e.g. by rain and/or dirt) are compensated for by measuring the degree of reflection of light from the window(s) when illuminated by light pulses. By means of a special measuring sequence in a processor unit included in the cloud height measuring device, light pulses separate from those used for the cloud height measurement itself, can be employed to assess the extent of the fouling. The measurement energy can then be controlled during the cloud height measurement proper, so that the total attenuation, caused by rain and dirt on the windows, is properly compensated for.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.