Mr. Jason Fathi Profile

Jason Fathi

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Proceedings Article | 29 May 2013 Paper

Investigation of short cavity CRDS noise terms by optical correlation

Steven Griffin, Jason Fathi

Proceedings Volume 8710, 87100P (2013) https://doi.org/10.1117/12.2016212

KEYWORDS: Sensors, Signal to noise ratio, Data analysis, Fabry–Perot interferometers, Absorption, Optical correlators, Speckle, Refraction, Atmospheric modeling, Interference (communication)

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Cavity Ring Down Spectroscopy (CRDS) has been identified as having significant potential for Department of Defense security and sensing applications. Significant factors in the development of new sensor architectures are portability, robustness and economy. A significant factor in new CRDS sensor architectures is cavity length. Prior publication has examined the role of cavity length in sensing modality both from the standpoint of the system’s design and the identification of potential difficulties presented by novel approaches. Two of interest here are new noise terms that have been designated turbulence-like and speckle-like in prior publication. In the prior publication the theoretical and some empirical data was presented. This presentation addresses the automation of the experimental apparatus, new data analysis, and implications regarding the significance of the two noise terms. This is accomplished through an Analog-to- Digital Conversion (ADC) from the output of a custom designed optical correlator. Details of the unique application of the developed instrument and implications for short cavity (portable) CRDS applications are presented.

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