Impact of primary aberrations on coherent lidar performance

Qi Hu, Peter John Rodrigo, Theis Faber Quist Iversen, Christian Pedersen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

30 Downloads (Pure)

Abstract

In this work we investigate the performance of a monostatic coherent lidar system in which the transmit beam is under the influence of primary phase aberrations: spherical aberration (SA) and astigmatism. The experimental investigation is realized by probing the spatial weighting function of the lidar system using different optical transceiver configurations. A rotating belt is used as a hard target. Our study shows that the lidar weighting function suffers from both spatial broadening and shift in peak position in the presence of aberration. It is to our knowledge the first experimental demonstration of these tendencies. Furthermore, our numerical and experimental results show good agreement. We also demonstrate how the truncation of the transmit beam affects the system performance. It is both experimentally and numerically proven that aberration effects have profound impact on the antenna effciency, the optimum truncation of the transmit beam and the spatial sensitivity of a CW coherent lidar system. Under strong degree of aberration, the spatial confinement is significantly degraded. However for SA, the degradation of the spatial confinement can be reduced by tuning the truncation of the transmit beam, which results from the novel finding in this work, namely, that the optimum truncation ratio depends on the degree of SA.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages6
Volume8992
PublisherSPIE - International Society for Optical Engineering
Publication date2014
Article number89920T
DOIs
Publication statusPublished - 2014
EventSPIE Photonics West : Photonic Instrumentation Engineering - San Francisco, California, United States
Duration: 1 Feb 20146 Feb 2014

Conference

ConferenceSPIE Photonics West : Photonic Instrumentation Engineering
CountryUnited States
CitySan Francisco, California
Period01/02/201406/02/2014
SeriesProceedings of SPIE, the International Society for Optical Engineering
Volume8992
ISSN0277-786X

Keywords

  • Remote Sensing
  • Lidar
  • Laser Doppler velocimetry

Fingerprint Dive into the research topics of 'Impact of primary aberrations on coherent lidar performance'. Together they form a unique fingerprint.

Cite this