Fiber optic oxygen sensor using fluorescence quenching for aerospace application

Allen Panahi

doi:10.1117/12.918903

15 May 2012 Fiber optic oxygen sensor using fluorescence quenching for aerospace application

Allen Panahi

Proceedings Volume 8368, Photonic Applications for Aerospace, Transportation, and Harsh Environment III; 836806 (2012) https://doi.org/10.1117/12.918903
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

In this paper we explore Fluorescence Technology as applied to the design and development of O₂ sensors that can be used for aerospace application and discuss the various test and measurement techniques used to estimate the O₂ gas concentration. Jet fuel comprised of heavier hydrocarbon components is much less volatile, than jet fuel having a flash point of approximately 37° C and JP-4 having a flash point of approximately -17° C. In contrast, straight-run gasoline has a flash point of approximately -40°C. The flash point is the minimum temperature where a liquid fuel can generate enough vapor to form a flammable mixture with air. If the temperature is below the flash point there isn't enough fuel evaporating to form a flammable fuel-air mixture. Since jet fuel and gasoline have similar flammable concentration limits, gasoline must produce much more vapor at a given temperature to have such a low flash point; hence gasoline is much more volatile than jet fuel. We compare the various intensity based approaches and contrast them with the frequency domain techniques that measure phase to extract fluorescent lifetimes. An innovate compact measurement system using the frequency heterodyning cross correlation technique that can be used for various applications is described in detail while the benefits are explored together with some test data collected. The various inerting fuel tank requirements are explained.

Citation Download Citation

Allen Panahi "Fiber optic oxygen sensor using fluorescence quenching for aerospace application", Proc. SPIE 8368, Photonic Applications for Aerospace, Transportation, and Harsh Environment III, 836806 (15 May 2012); https://doi.org/10.1117/12.918903

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