30 August 2017 Observation and analysis of modulation and noise in visible and near infrared diffuse ambient daylight
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Abstract
We report on observations of low level noise and modulation in natural sky light and in sunlit scenes. Data were taken with various clear sky and partly cloudy conditions of the sky itself, as a function of altitude and angular resolution, and of naturally illuminated scenes. Different optical and sensor configurations were employed to explore the contributions of natural signal fluctuation to the remote sensing of vibrations through modulation of optical and near infrared diffusely scattered light and temporal imaging of partially resolved high contrast features. Low noise InGaAs high dynamic range photodiodes and cameras, and silicon image sensors were used with real time and post-processing to identify the noise floor, and to establish practical limits on light level and viewing distance in the use of these methods for remote structural health and vibration monitoring.
Conference Presentation
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John Kielkopf, John Kielkopf, Elijah Jensen, Elijah Jensen, Frank O. Clark, Frank O. Clark, Jeffrey R. Hay, Jeffrey R. Hay, } "Observation and analysis of modulation and noise in visible and near infrared diffuse ambient daylight", Proc. SPIE 10403, Infrared Remote Sensing and Instrumentation XXV, 104030B (30 August 2017); doi: 10.1117/12.2274041; https://doi.org/10.1117/12.2274041
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