Frequency-agile bandpass filter for direct detection lidar receivers

William J. Marinelli; Christopher M. Gittins; William G. Lawrence

doi:10.1117/12.336853

18 January 1999 Frequency-agile bandpass filter for direct detection lidar receivers

William J. Marinelli, Christopher M. Gittins, William G. Lawrence

Proceedings Volume 3533, Air Monitoring and Detection of Chemical and Biological Agents; (1999) https://doi.org/10.1117/12.336853
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

This paper discusses the development of a frequency agile receiver for CO₂ laser based differential absorption lidar (DIAL) systems. The receiver is based on the insertion of a low-order tunable etalon into the detector field of view. The incorporation of the etalon in the receiver reduces system noise by decreasing the instantaneous spectral bandwidth of the IR detector to a narrow wavelength range centered on the transmitted CO₂ laser line, thereby improving the overall D* of the detection system. A consideration of overall lidar system performance result in a projected factor of 2 to 7 reduction in detector system noise, depending on the characteristics of the environment being probed. These improvements can play a key role in extending the ability of DIAL to monitor chemical releases form long standoff distances.

Citation Download Citation

William J. Marinelli, Christopher M. Gittins, and William G. Lawrence "Frequency-agile bandpass filter for direct detection lidar receivers", Proc. SPIE 3533, Air Monitoring and Detection of Chemical and Biological Agents, (18 January 1999); https://doi.org/10.1117/12.336853

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