Fiber-coupled LWIR hyperspectral sensor suite for non-contact component surface temperature measurements

We report on the development of a robust fiber-coupled long-wavelength infrared (LWIR) hyperspectral sensor suite for accurate and reliable non-contact surface temperature measurements in propulsion systems with limited optical access. We first experimentally investigate various state-of-the-art LWI...

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Bibliographic Details
Published in:Applied optics (2004) 2018-12, Vol.57 (36), p.10418
Main Authors: Hsu, Paul S, Rein, Keith, Oleksandr, Bibik, Wu, David, Cook, Timothy S, Adhikari, Subodh, Emerson, Benjamin, Lieuwen, Timothy, Gord, James R, Roy, Sukesh
Format: Article
Language:English
Subjects:
Black body radiation
Combustion chambers
Design engineering
Design optimization
Environmental protection
Infrared detectors
Optical fibers
Propulsion systems
Protective coatings
Sensors
State of the art
Surface temperature
Systems design
Temperature
Temperature measurement
Thermal barrier coatings
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Summary:We report on the development of a robust fiber-coupled long-wavelength infrared (LWIR) hyperspectral sensor suite for accurate and reliable non-contact surface temperature measurements in propulsion systems with limited optical access. We first experimentally investigate various state-of-the-art LWIR optical fibers and identify the ideal fiber for efficient coupling and transmission of LWIR signals. The effects of the fiber material, structure, bending, and thermal heating on LWIR fiber transmission are characterized. Subsequently, we discuss the development of a fiber-coupled LWIR hyperspectral sensor using a multi-mode polycrystalline fiber. The temperature measurement accuracy and precision of the sensor are determined using a well-calibrated blackbody radiation source and heated thermal barrier coating. The sensor is integrated into a homemade water-cooled probe housing and environmental protection box and subsequently used for reliable combustor liner temperature measurements in a high-pressure, liquid-fueled combustor rig with no built-in optical access. We also discuss the measurement challenges associated with flame interference and potential solutions. The LWIR sensor shows significant promise in its application to surface temperature measurements, and our findings can aid propulsion system engineers and researchers in system design and operation optimization.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.57.010418