Abstract
Stable operation of graphene-diaphragm based fiber-tip photoacoustic gas sensor is achieved by use of a modified Sagnac interferometer with a 3x3 coupler. A detection limit of 1.5 ppm of C2H2 balanced with 𝑁2 is demonstrated and the system stability is <0.4 dB over 6 hours.
© 2015 Optical Society of America
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