Abstract
A sensitive carbon disulfide (CS2) sensor based on wavelength modulation spectroscopy (WMS) in the mid-infrared fingerprint region was reported. The strong band spectrum of carbon disulfide's combination band (ν1+ν3), near 2177.6cm−1, was used in the sensor. To enable WMS for wideband spectrum, a parameter of Spectral Discrimination (SD) was defined and used as a criterion for optimizing the modulation index, which was finally determined to be around 0.8 instead of 2.2 commonly used for an isolated line spectrum. And the second harmonic signal was processed with empirical mode decomposition (EMD) algorithm to distinguish and remove the optical fringes buried in the detected signal. The sensor performances were tested by implementing a set of CS2 concentration experiments. The results showed that the sensor response linearity was 0.999 and the relative measuring error was less than 1%. The sensitivity, i. e. 3σ detection limit, was as low as 60ppb with integration time of 240s with optical path length of 5m, corresponding to absorbance of 3×10−5. Overall, benefiting from strong fingerprint absorption and methods of applying WMS to wideband spectrum, the sensor is promising for both environmental and industrial CS2 detection.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
