Tunable diode laser IR spectrometer for in situ measurements of the gas phase composition and particle size distribution of Titan's atmosphere

Details Tunable diode laser IR spectrometer for in situ measurements of the gas phase composition and particle size distribution of Titan's atmosphere Tunable diode laser IR spectrometer for in situ measurements of the gas phase composition and particle size distribution of Titan's atmosphere

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apopt..29..907w&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 29, March 1, 1990, p. 907-917.

Physics

Optics

7

Atmospheric Composition, Infrared Spectrometers, Laser Spectroscopy, Titan, Tunable Lasers, Cassini Mission, Particle Size Distribution, Satellite Atmospheres, Sensitivity, Vapor Phases

Scientific paper

A new instrument, the Probe Infrared Laser Spectrometer (PIRLS), is described for in situ sensing of the gas composition and particle size distribution of Titan's atmosphere on the NASA/ESA Cassini mission. For gas composition measurements, several narrow-band (0.0001/cm) tunable lead-salt diode lasers operating near 80 K at selected mid-IR wavelengths are directed over a path length defined by a small reflector extending over the edge of the probe spacecraft platform; volume mixing ratios of 10 to the -9th should be measurable for several species of interest. A cloud-particle-size spectrometer using a diode laser source at 780 nm shares the optical path and deployed reflector; a combination of imaging and light scattering techniques is used to determine sizes of haze and cloud particles and their number density as a function of altitude.

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