From Event: SPIE Optical Engineering + Applications, 2017
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.
John Kielkopf, Elijah Jensen, Frank O. Clark, and 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 (Presented at SPIE Optical Engineering + Applications: August 07, 2017; Published: 30 August 2017); https://doi.org/10.1117/12.2274041.
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