کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5009385 1462044 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-sensitive carbon disulfide sensor using wavelength modulation spectroscopy in the mid-infrared fingerprint region
ترجمه فارسی عنوان
سنسور حساس به کربن دی سولفید با استفاده از طیف سنجی مدولاسیون طول موج در ناحیه اثر انگشت مادون قرمز
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
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 2177.6 cm−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 60 ppb with integration time of 240 s with optical path length of 5 m, 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 247, August 2017, Pages 384-391
نویسندگان
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