A matrix of optical fiber sensors eligible for remote measurements is reported in this paper. The aim of work was to monitor the air quality with a device, which does not need any electricity on site of the measurement. The matrix consists of several sensors detecting carbon dioxide concentration, relative humidity and temperature. Sensors utilize active optical materials, which change their color when exposed to varied conditions. All the sensors are powered with standard light emitting diodes. Light is transmitted by an optical fiber from the light source and then it reaches the active layer which changes its color, when the conditions change. This results in a change of attenuation of light passing through the active layer. Modified light is then transmitted by another optical fiber to the detector, where simple photoresistor is used. It is powered by a stabilized DC power supply and the current is measured. Since no expensive elements are needed to manufacture such a matrix of sensors, its price may be competitive to the price of the devices already available on the market, while the matrix also exhibits other valuable properties.
Karol Wysokiński, Marta Filipowicz, Tomasz Stańczyk, Stanisław Lipiński, Marek Napierała, Michał Murawski, and Tomasz Nasiłowski, "Simultaneous remote measurement of CO2 concentration, humidity and temperature with a matrix of optical fiber sensors," Proc. SPIE 10434, Electro-Optical Remote Sensing XI, 104340D (Presented at SPIE Security + Defence: September 11, 2017; Published: 5 October 2017); https://doi.org/10.1117/12.2278293.
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