1 August 2007 Infrared phototransistor validation for atmospheric remote sensing application using the Raman-shifted eye-safe aerosol lidar
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Optical Engineering, 46(8), 086001 (2007). doi:10.1117/1.2772280
Abstract
An InGaAsSb/AlGaAsSb phototransistor has been validated for lidar atmospheric remote sensing. The validation was performed using the Raman-shifted eye-safe aerosol lidar (REAL) at the National Center for Atmospheric Research. Although the device is optimized for detection around the 2-μm wavelength, the validation was performed at 1.543 μm, where mature commercial detectors are available. Simultaneous measurement of the atmospheric backscatter signals using the custom-built phototransistor and commercial InGaAs avalanche photodiode indicated good agreement between both devices. The validation included detecting 11-km-range hard targets, 5-km atmospheric structure consisting of cirrus clouds, and a near-field boundary layer. Far-field low intensity and spatially narrow atmospheric features were also detectable with the new phototransistor. Preliminary results related to systematic effects are discussed in the first attempt of incorporating a phototransistor in a lidar system.
Tamer F. Refaat, Syed Ismail, Terry L. Mack, M. Nurul Abedin, Shane D. Mayor, Scott M. Spuler, Upendra N. Singh, "Infrared phototransistor validation for atmospheric remote sensing application using the Raman-shifted eye-safe aerosol lidar," Optical Engineering 46(8), 086001 (1 August 2007). http://dx.doi.org/10.1117/1.2772280
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KEYWORDS
Phototransistors

LIDAR

Sensors

Avalanche photodetectors

Atmospheric sensing

Signal to noise ratio

Infrared sensors

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