In this paper, we propose tapered reflectors having stair-like
structures that focus scattered infrared (IR) rays to enhance the
detection performance of a non-dispersive IR NDIR CO2 sensor.
We demonstrate that the sensitivity of the output voltage is increased
by 2 and 1.27 times in simulations and experiments, respectively,
compared with the case when conventionally tapered reflectors are used.
Through applying a stair-like structure inside the tapered optical
cavity, scattered IR rays are condensed, and more accurate CO2
concentration measurements are possible. In addition, we show that the
output voltage changes only slightly with temperature and humidity
variations compared with the conventionally tapered optical cavity.
Because the proposed structure can be applied to any type of optical
cavity without major modifications, we expect that it can resolve the
performance limitations of low-end NDIR gas sensors.
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