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Single channel gas sensor head
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Some
tasks allow using single channel (or one color) schematics for gas
concentration measurements. On the other hand at an initial stage of
research it is acceptable to use simple devices that can help understanding
of the gas sensing peculiarities. Such is the sensor head that consists of
LED and PD optically coupled via a spherical mirror as shown in the figures
below. Shown below are also the scans from oscilloscope that demonstrate
changes of photosignals in the presence of the absorbing gas (CO2
particularly).
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Sotnikova, G. Y.; Gavrilov, G. A.;
Aleksandrov, S. E.; Kapralov, A. A.; Karandashev, S. A.; Matveev, B. A.;
Remennyy, M. A. "Low Voltage CO2-Gas Sensor Based on III–V Mid-IR Immersion
Lens Diode Optopairs: Where we Are and How Far we Can Go?" Sensors Journal,
IEEE Volume 10, Issue 2, Feb. 2010 Page(s): 225 – 234 Digital Object
Identifier 10.1109/JSEN.2009.2033259
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S.A.Aleksandrov, G.A.Gavrilov,
A.A.Kapralov, S. A. Karandashev, N. V. Zotova, , B. A. Matveev, M. A.
Remennyi, N. M. Stus’, G.Yu.Sotnikova and Petrov V.A. "Single channel gas
analyzers based on immersion lens Mid-IR diode optopairs", Book of abstracts
of the 6th International Conference
"Mid-Infrared Optoelectronics Materials and Devices (MIOMD-VII), September
2005, Lancaster, UK
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