“…In terms of applications, the configurations using FPIs were mainly used for temperature [15,16,20,23,25,29,30,32,34,38] and strain sensing. [9,12,18,19,35] Apart from these two applications, others such as magnetic field sensing, [9] gas refractive index, [21,26] and pressure sensing, [17,24] airflow sensing, [22] hydrogen sensing, [14] humidity sensing, [13] volatile organic compounds sensing, [28] and refractive index sensing of liquids [31] were also reported. Simultaneous measurement of parameters is also possible, combining the response of the Vernier envelope with the individual interferometric peaks from the reflection spectrum.…”