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Single channel gas sensor head


 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).




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 IIIV 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

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