Abstract
Lightwave Synthesized Frequency Sweepers (LSFS) have potential use as lightsources in lidar anemometers. In
this paper noise due to leakage in the acousto optic modulators in an LSFS is investigated. Theoretical
expressions describing the build-up of noise in the LSFS due to leakage are derived. Two types of leakage are
measured. First the non-shifted leakage through a closed AOM is measured and good agreement with the
expected value is found and secondly the non-shifted and multiple-shifted leakage through an open AOS is
measured in heterodyne setup. In LSFS driven Frequency Stepped Pulse Train (FSPT) modulated lidars the
leakage will give rise to rapidly growing noise in the bins which corresponds to the signal from low radial wind
velocities. It is likely that noise canceling techniques similar to those used for RIN removal has to be deployed
for measurements of low wind velocities.
Original language | English |
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Title of host publication | CLRC 15th Coherent Laser Radar Conference |
Publication date | 2009 |
Publication status | Published - 2009 |
Event | CLRC 15th Coherent Laser Radar Conference - Toulouse, France Duration: 1 Jan 2009 → … |
Conference
Conference | CLRC 15th Coherent Laser Radar Conference |
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City | Toulouse, France |
Period | 01/01/2009 → … |
Keywords
- Wind energy
- Test and measurements