23 April 2012 Compact liquid crystal waveguide Fourier transform spectrometer for real-time gas sensing in NIR spectral band
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Jet Propulsion Lab and Vescent Photonics Inc. and are jointly developing an innovative ultra-compact (volume < 10 cm3), ultra-low power (<10 -3 Watt-hours per measurement and zero power consumption when not measuring), completely non-mechanical Liquid Crystal Waveguide Fourier Transform Spectrometer (LCWFTS) that will be suitable for a variety of remote-platform, in-situ measurements. These devices are made possible by novel electro-evanescent waveguide architecture, enabling "monolithic chip-scale" Electro Optic-FTS (EO-FTS) sensors. The potential performance of these EO-FTS sensors include: i) a spectral range throughout 0.4-5 μm (25000 - 2000 cm-1), ii) highresolution (Δλ≤ 0.1 nm), iii) high-speed (< 1 ms) measurements, and iv) rugged integrated optical construction. This performance potential enables the detection and quantification of a large number of different atmospheric gases simultaneously in the same air mass and the rugged construction will enable deployment on previously inaccessible platforms. The sensor construction is also amenable for analyzing aqueous samples on remote floating or submerged platforms. We have reported [1] a proof-of-principle prototype LCWFTS sensor that has been demonstrated in the near- IR (range of 1450-1600 nm) with a 5 nm resolution. In this paper, we will report the recently built and tested LCWFTS test bed and the demonstration of a real-time gas sensing applications.
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Tien-Hsin Chao, Tien-Hsin Chao, Thomas T. Lu, Thomas T. Lu, Scott R. Davis, Scott R. Davis, Scott D. Rommel, Scott D. Rommel, George Farca, George Farca, Ben Luey, Ben Luey, Alan Martin, Alan Martin, Michael H. Anderson, Michael H. Anderson, } "Compact liquid crystal waveguide Fourier transform spectrometer for real-time gas sensing in NIR spectral band", Proc. SPIE 8398, Optical Pattern Recognition XXIII, 83980H (23 April 2012); doi: 10.1117/12.923481; https://doi.org/10.1117/12.923481

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