High Sensitivity Fiber Fabry Perot NH3 Sensor Based on PMMA Film

Ammonia
$(\text{NH}_{3})$
has been being widely used in medical and industrial applications. In this study, we demonstrated a fiber extrinsic Fabry-Pérot interferometer (EFPI) sensor, the interference cavity of which is configured by the end-face of single-mode fiber (SMF) and the polymethyl methacrylate (PMMA) film in a capillary. Based on high response characteristics of PMMA film for
$\text{NH}_{3}$
, the sensor achieves a sensitivity of up to
$500 pm/ppm$
for
$\text{NH}_{3}$
concentration detection experimentally.