Abstract

A fiber-coupled, hyperspectral imaging sensor (HSIS) ranging from ultraviolet (UV) to short-wavelength-infrared (SWIR) wavelengths is developed for remote detection of planar [two-dimensional (2D)], spectrally resolved flame emission. The key component of the sensor is a dimension-reduction 2D-to-1D (one-dimensional) fiber-optic array that contains 1024 fibers and features high-UV optical transmission ($>30\%$ transmission at 310–340 nm, $>90\%$ at 340–2000 nm), wide operational wavelengths (300–2400 nm), and a compact and robust design (full length $<5\mathrm{cm}$). The flame-emission signals are transmitted to the remote HSIS through a 3-m-long, UV-grade, imaging fiber bundle that consists of 30,000 single-mode fibers. The design of the 2D-to-1D fiber array, the fiber-characterization process, and the sensor development are discussed in detail. 2D spectrally resolved measurements of ${\mathrm{CH}}^{*}$, ${\mathrm{OH}}^{*}$, and $C_2^{*}$ distribution are made in premixed laminar flames. Improved chemiluminescence-based fuel/air ratio measurements using spectrally resolved detection are demonstrated. The results of the current study indicate that implementation of fiber-coupled HSIS is feasible in practical gas-turbine-engine test facilities with limited optical access.

© 2017 Optical Society of America

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