Figure 4: Temperature resolution analysis.
From: Real-time micro-scale temperature imaging at low cost based on fluorescent intensity ratio

(a) Frequency density of the natural logarithm of FIR at different temperatures from 120 °C to 280 °C with a step of 10 °C. Due to the fact that FIR increases with temperature, curves from left to right respectively correspond to temperature from 120 to 280 °C. (b) The variation of relative temperature sensitivity with temperature.