Fig. 5: Performances of the wearable optical fibre temperature sensor.
From: Mn2+-activated dual-wavelength emitting materials toward wearable optical fibre temperature sensor
a Schematic diagram of the optical fibre sensor based on fluorescence sensing platform. CP unit: Controlling and processing unit. PID: proportional-integral-derivative. b Fluorescence responses of the Li2Zn0.85SiO4:0.15Mn2+ integrated optical fibre sensor to temperature ranging from –20 to 100 oC with an interval of 20 oC. c Emission intensity ratios of I530/I650 versus the temperature. I530 and I650 at a given temperature are calculated based on the integrated emission intensity from 520–540 nm and 640–660 nm, respectively. d Fluctuations of the optical sensor output over time at the constant temperature of 37 oC. e Temperature cycling test of the optical fibre sensor between 0–80 oC. f Monitoring the change of water temperature with time by using the as-fabricated optical sensor. The inset shows the photograph of the water-temperature measuring by using the fibre sensor. g Monitoring the temperature change of the exhale and inhale with time by using the as-fabricated optical sensor. The inset displays the photograph of temperature change detection of the exhale and inhale of a volunteer by using the fibre sensor fixed on the mask. h Tracking the response time of a commercial thermistor and the fabricated optical fibre sensor.
