Signal to Noise Ratio Characterization of Coherent Doppler Lidar Backscattered Signals

Mark Arend,F Moshary,Fred Moshary,M Arend,Sameh Abdelazim,Sam Ahmed,David Santoro,B Gross

doi:10.1051/epjconf/201611917014

Mark Arend, F Moshary + Show 6 more

Open Access

https://doi.org/10.1051/epjconf/201611917014

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Abstract

An eye-safe coherent Doppler Lidar (CDL) system for wind measurement was developed and tested at the Remote Sensing Laboratory of the City College of New York (CCNY). The system employs a 1542 nm fiber laser to leverage components’ availability and affordability of the telecommunication industry. A balanced detector with a bandwidth extending from dc to 125 MHz is used to eliminate the common mode relative intensity noise (RIN). The system is shot noise limited i.e., the dominant component of received signals’ noise is the shot noise. Wind velocity can be measured under nominal aerosol loading and atmospheric turbulence conditions for ranges up to 3 km while pointing vertically with 0.08 m/s precision.

Highlights

Coherent Doppler Lidar (CDL) is widely used for remote sensing of the atmosphere
Since the late 1980s, researchers started to deploy CDL systems with newly developed solid-state lasers which lead to advantages of size, weight, reliability, and lifetime
An all-fiber coherent Doppler lidar for wind sensing was developed and tested at the Remote Sensing Laboratory of the City College of New York (CCNY) that utilizes 1.5 μm fiber laser pulsed at 20 KHz [6] [7] [8]

Summary

INTRODUCTION

Coherent Doppler Lidar (CDL) is widely used for remote sensing of the atmosphere. The first CDL wind-sensing system was reported by Huffaker et al [1] in 1970, where a 10.6 μm cw CO2 laser was used. Since the late 1980s, researchers started to deploy CDL systems with newly developed solid-state lasers which lead to advantages of size, weight, reliability, and lifetime. Hawley et al [4] developed a 1.06 μm pulsed CDL system for wind sensing. Karlsson et al [5] reported a 1.5 μm cw all-fiber wind sensing CDL system. An all-fiber coherent Doppler lidar for wind sensing was developed and tested at the Remote Sensing Laboratory of the City College of New York (CCNY) that utilizes 1.5 μm fiber laser pulsed at 20 KHz [6] [7] [8]

SYSTEM’S CONFIGURATION

MEASUREMENTS

CONCLUSION

Findings

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