A low-cost miniaturized laser heterodyne radiometer (mini-LHR) for near-IR measurements of CO2 and CH4 in the atmospheric column
- Resource Type
- Conference
- Authors
- Wilson, Emily L.
- Source
- 2016 Conference on Lasers and Electro-Optics (CLEO) Lasers and Electro-Optics (CLEO), 2016 Conference on. :1-2 Jun, 2016
- Subject
- General Topics for Engineers
Photonics and Electrooptics
Atmospheric measurements
Measurement by laser beam
Radiometry
Optical variables measurement
Gas lasers
Laser theory
Geophysical measurements
- Language
The miniaturized laser heterodyne radiometer (mini-LHR) is a ground-based passive variation of a laser heterodyne radiometer that uses sunlight to measure absorption of CO 2 and CH 4 in the infrared. Sunlight is collected using collimation optics mounted to an AERONET sun tracker, modulated with a fiber switch and mixed with infrared laser light in a fast photoreciever. The amplitude of the resultant RF (radio frequency) beat signal correlates with the concentration of the gas in the atmospheric column.