High sensitive luminescence thermometer using Ruphen-based temperature sensitive paint

The accurate temperature measurement with micrometric spatial resolution is difficult to acquire by using conventional contact thermal probes. Noncontact thermal probes possess great potential for future high resolution accurate temperature measurements. Herein, we report a thermometer based on Ruphen-based temperature sensitive paint (TSP) for high-sensitive remote temperature measurement. TSP consisting of Ruphen and PVDF with sharp emission band and high internal quantum efficiency was designed and employed to fabricate a luminescence thermometer prototype for infrared-to-visible converter in this study. The temperature dependent photoluminescence properties of the different Ruphen/PVDF films were analyzed in the range of 283 K to 363 K, and a relatively high thermal sensitivity (−4.3 %K −1 @ RT) was obtained for low Ruphen concentration sample. The as-fabricated temperature sensor prototype can detect a 623 K thermal object with a response time of 1.52 s and a noise equivalent temperature difference ( NETD ) of 2.40 K. Furthermore, the effect of IR absorber on the imaging performance was also investigated, and an optimized response time of 1.17 s and NETD of 1.68 K were observed. The results indicate that Ruphen/PVDF film is promising for a luminescence thermometer for room temperature mapping.