ISSN:
1349-9432
Keywords:
frequency modulation spectroscopy (FMS)
;
Fabry-Perot etalon
;
high finesse
;
dual frequency modulation (DFM)
;
resonance mode
;
heterodyne optical measurement
;
trace gas concentration
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s10043-996-0243-y
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