Fabry-Pérot Fiber-Optic Sensors for Physical Parameters Measurement in Challenging Conditions

Figure 1

In situ measurement of 1 L water bath temperature inside a 1 200 W microwave with 3 FOT-L temperature sensors and OSR interrogator from FISO Technologies allows oven power calculation even during microwave heating. The microwave peak power (1200 W) is determined using the protocol described in the IEC-60705 international standard. The end of magnetron filament heating-up time is detected by the start of water bath temperature increase. After 45 seconds (vertical dashed line) when the heating program stops, the door is open and the water is stirred for better temperature uniformity. The temperature rises to a maximum that is used to define the microwave power as stated in the IEC-60705 international standard.