Recent HSRL improvements--potential for application to DOE systems
Authors
Edwin W. Eloranta — University of Wisconsin
Ilya I Razenkov — University of Wisconsin
Joseph Palani Garcia — University of Wisconsin
Martin Lawson — University of Wisconsin
Category
ARM infrastructure
Description
The DOE High Spectral Resolution Lidars installed in ARM's second Mobile Facility and at the NSA site are based on a 2009 design. The technology has advanced in the past seven years so that our latest systems provide additional data channels and higher-quality data. New data channels include a wide-field-of-view molecular scattering profile to improve extinction measurements, a 1064 nm backscatter profile that provides aerosol particle-size information, and with an experimental temperature profiling channel. System upgrades include: 1)a new transmit-receiver switch that improves depolarization measurements; 2)a fiber-optic scrambler that reduces range-dependent calibration errors; 3) calibration hardware athat provides much improved signal-to-noise ratios and thus more accurate calibrations; 4) a new FPGA-based photon counting data system; 5) new A/D converter, temperate control, and USB-buss electronics that replace hang-up prone systems; and 5) a DFB-diode laser seeder that improves laser frequency stability with a direct impact on calibration accuracy--this has been installed in the MF2 system and in the spare laser, but not at NSA.
This poster will look at the operational reliability and calibration of the current DOE HSRL systems and discuss potential impacts of this new technology.
