کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
745672 894426 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A CO2 sensor based upon a continuous-wave thermoelectrically-cooled quantum cascade laser
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
A CO2 sensor based upon a continuous-wave thermoelectrically-cooled quantum cascade laser
چکیده انگلیسی

A CO2 sensor based upon a continuous-wave thermoelectrically-cooled distributed feedback quantum cascade laser operating between 2305 and 2310 cm−1 and a 54.2 cm long optical cell has been developed. Two approaches for direct absorption spectroscopy have been evaluated and applied for monitoring of the CO2 concentration in gas lines and ambient laboratory air. In the first approach optical transmittance was derived from the single channel laser intensity, whilst in the second approach a ratio of signal and reference laser intensities (balanced detection) was used. The optimum residual absorption standard deviation was estimated to be 1.9 × 10−4 for 100 averages of 1 ms duration and 0.1 cm−1 scans over the P(46) CO2 absorption line of the ν3 vibrational band at 2306.926 cm−1. A CO2 detection limit (1 standard deviation) of 36 ppb was estimated for 0.1 s average and balanced detection.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 157, Issue 2, 20 October 2011, Pages 635–640
نویسندگان
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