Characterization of FIREFLY, an Imaging Spectrometer Designed for Remote Sensing of Solar Induced Fluorescence
| Autor: | Bruce D. Cook, Ian Paynter, Jyoteshwar Nagol, Joel McCorkel, Lawrence A. Corp |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
spectroscopy
Materials science 010504 meteorology & atmospheric sciences 0211 other engineering and technologies Imaging spectrometer 02 engineering and technology lcsh:Chemical technology 01 natural sciences Biochemistry Article Analytical Chemistry remote sensing lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation 021101 geological & geomatics engineering 0105 earth and related environmental sciences Remote sensing Spectrometer Stray light Hyperspectral imaging Atomic and Molecular Physics and Optics Integrating sphere Lidar Radiance fluorescence Dark current |
| Zdroj: | Sensors, Vol 20, Iss 4682, p 4682 (2020) Sensors Volume 20 Issue 17 Sensors (Basel, Switzerland) |
| ISSN: | 1424-8220 |
| Popis: | Solar induced fluorescence (SIF) is an ecological variable of interest to remote sensing retrievals, as it is directly related to vegetation composition and condition. FIREFLY (fluorescence imaging of red and far-red light yield) is a high performance spectrometer for estimating SIF. FIREFLY was flown in conjunction with NASA Goddard&rsquo s lidar, hyperspectral, and thermal (G-LiHT) instrument package in 2017, as a technology demonstration for airborne retrievals of SIF. Attributes of FIREFLY relevant to SIF retrieval, including detector response and linearity full-width at half maximum (FWHM) stray light dark current and shot noise were characterized with a combination of observations from Goddard&rsquo s laser for absolute measurement of radiance calibration facility an integrating sphere controlled acquisitions of known targets in-flight acquisitions and forward modelling. FWHM, stray light, and dark current were found to be of acceptable magnitude, and characterized to within acceptable limits for SIF retrieval. FIREFLY observations were found to represent oxygen absorption features, along with a large number of solar absorption features. Shot noise was acceptable for direct SIF retrievals at native resolution, but indirect SIF retrievals from absorption features would require spatial aggregation, or repeated observations of targets. |
| Databáze: | OpenAIRE |
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