Development of high spectral resolution lidar using a multi-longitudinal mode laser

NOBUO SUGIMOTO; LIDIA ANA OTERO; YOSHITAKA JIN; PABLO ROBERTO RISTORI; TOMOAKI NISHIZAWA; EDUARDO QUEL

Noazawa-onsen, Nagano, Japan

Simposio; 34th Japanese Laser Sensing Symposium; 2016

Laser Radar Society of Japan; Symposium Chair : Prof. Yasunori Saito, Shinshu University

This paper describes an analysis methodfor signals measured by high spectral resolution lidar (HSRL) using amulti-longitudinal mode laser and a Mach-Zehnder interferometer having the samefree spectral range as the mode spacing of the laser. Scanning theinterferometer in the span of one fringe, the lidar signals at the minimum and maximumMie-scattering transmission are measured. Backscattering and Extinctioncoefficients for aerosols are derived from the minimum and maximum signals andthe minimum transmittance of interferometer for Mie-scattering. Thetransmittance can be estimated using reference signals from a portion of thetransmitted laser beam. We use an analysis method to determine thetransmittance using all data taken in the periodical scan by fittingtheoretical curves to the signals. A demonstration of analysis for referenceand atmospheric scattering signals is shown.