Atmospheric transmissometer using a modulated optical source
US9236939B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 2014 |
| Grant date | Jan 12, 2016 |
| Priority date | — |
| Expiry date | Jul 16, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/1121
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system and method involve detecting a modulated optical signal from an atmospheric propagation channel, wherein the modulated optical signal comprises an optical signal from an optical source modulated with a periodic signal at a modulation frequency greater than the bandwidth of the turbulence within the atmospheric propagation channel, and converting the detected modulated optical signal into a digitized electrical signal. The method also includes determining the root mean square signal power of an AC component of the digitized electrical signal at the modulation frequency. The method further includes determining the power spectral density of the digitized electrical signal, determining the magnitude of the peak component at the modulation frequency, and determining the effective optical depth of the atmospheric propagation channel using the magnitude of the peak component at the modulation frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.