Effect of speckle on coherent and incoherent Doppler lidar

Kenneth W. Fischer; Wilbert R. Skinner

doi:10.1117/12.205579

10 February 1995 Effect of speckle on coherent and incoherent Doppler lidar

Kenneth W. Fischer, Wilbert R. Skinner

Proceedings Volume 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements; (1995) https://doi.org/10.1117/12.205579
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

Abstract

Doppler lidars can be separated into two main categories by the detection technique used, coherent or incoherent. This paper focuses on the differences between the two types of Doppler lidar and the effect of speckle on each. Coherent Doppler lidars make use of a local oscillator heterodyning system similar in principle to a Doppler radar to determine Doppler shift while incoherent lidars typically use an interferometric technique to resolve the small spectral shift. The effect of laser speckle on lidar measurements in general has become a topic of great interest in recent years because in many cases it limits the ultimate resolution or accuracy of the measurement. In the case of Doppler lidars, speckle has very different effects on coherent and incoherent Doppler detection systems. Due to the single-shot nature of coherent lidar measurements and the narrow field of view required, many shots of data are lost due to speckle. The larger fields of view used for incoherent Doppler lidar as well as the inherent multiple pulse averaging make speckle significantly less of a problem for these systems.

Citation Download Citation

Kenneth W. Fischer and Wilbert R. Skinner "Effect of speckle on coherent and incoherent Doppler lidar", Proc. SPIE 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements, (10 February 1995); https://doi.org/10.1117/12.205579

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