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High Sensitive Detection of Trace Gases Using Optical Heterodyne Method with a High Finesse Intra-Cavity Resonator |
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| Authors: | Akira Mugino Tomokazu Yamamoto Takashige Omatsu Mikhail A Gubin Atsuo Morinaga Nobuo Takeuchi |
| Institution: | (1) Center for Environmental Remote Sensing, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263, Japan;(2) Department of Image Science, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263, Japan;(3) P.N. Lebedev Physics Institute, Russian Academy of Sciences, 53 Leninsky Prospect, 117924 Moscow, Russia;(4) Department of Physics, Science University of Tokyo, 2641, Yamazaki, Noda-shi, Chiba 278, Japan |
| Abstract: | A novel highly sensitive method to detect the concentration of trace gas for environmental purposes is proposed. This method includes the application of frequency modulation for stabilization of laser frequency, together with optical heterodyne measurement. The shift of resonance frequency of the Fabry-Perot cavity resonator is due to the change of refractive index, accompanied by the dispersion effect due to the presence of a target gas (e.g., methane, carbon dioxide or nitrogen dioxide) inside the Fabry-Perot cavity. |
| Keywords: | frequency modulation spectroscopy (FMS) Fabry-Perot etalon high finesse dual frequency modulation (DFM) resonance mode heterodyne optical measurement trace gas concentration |
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