The IR modulator utilizing light scattering effect with ferroelectric liquid crystal for gas analysis |
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| Authors: | Junya Kobayashi Motoo Kinoshita Jun-ichi Kita Katsumi Yoshino |
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| Affiliation: | (1) Technological Research Laboratory, Shimadzu Corporation, 3-9, Hikaridai, Seika-cho, Soraku-gun, 619-02 Kyoto, Japan;(2) Department of Electronic Engineering, Faculty of Engineering, Osaka University, 2-1 Yamada-Oka, 565 Suita, Osaka, Japan |
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| Abstract: | ![]()
Experimental infrared modulator elements have been fabricated utilizing the transient light scattering effect of ferroelectric liquid crystal with asymmetric waveform voltage drive. The new elements perform 80% modulation degrees at the 632.8nm. We have also achieved 30% modulation degrees in the 4 to 5µ m region where the strongest CO2 absorption bands exist. A new type of analyzer which monitors ambient air quality has been developed. This analyzer uses non-dispersive infrared absorption method and composes of a double-beam, a single detector and a pair of liquid crystal light modulator as the IR chopper. The detection has achieved 10ppm noise equivalent concentration. |
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