Abstract
There are many figures of merit, which determine suitability of luminescent thermometers for practical applications. These include thermal sensitivity, thermal accuracy as well as ease and cost effectivness of technical implementation. A novel contactless emission thermometer is proposed, which takes advantage of the coexistence of photoluminescence from Nd3+ doping ions and black body emission in transparent Nd3+ doped-oxyfluorotellurite glass host matrix. The opposite temperature dependent emission from these two phenomena, enables to achieve exceptionally high relative sensitivity SR = 8.2%/°C at 220 °C. This enables to develop new type of emissive noncontact temperature sensors.
Highlights
The temperature is one of the most important thermodynamical parameters which describes the rate and character of physical processes and chemical reactions[1,2,3,4,5,6,7]
Spectroscopic measurements of the TZPN glasses were made under 808 nm excitation in a wide temperature range from 150° C to 400° C
At temperatures above 180 °C the appearance of a wide emission band at around 1480 nm was noted. The intensity of this band increased with temperature and its maximum was blue-shifting at elevated temperatures. This band was attributed to thermal emission, whose origin was confirmed in an independent experiment without optical excitation, where externally delivered thermal energy gave rise to the observed emission
Summary
The temperature is one of the most important thermodynamical parameters which describes the rate and character of physical processes and chemical reactions[1,2,3,4,5,6,7]. The obtained results gain accuracy proportionally to the spectral range used for fitting, which in general requires hyperspectral wide range NIR/MIR spectrometers As it will be shown here taking advantage from the opposite thermal monotonicity of thermal radiation and L n3+ luminescence the simplification of the experimental setup and enhancement of the sensitivity of temperature sensor to temperature changes are achieved. In this communication we propose the combination of N d3+ NIR luminescence and glass thermal emission toward the development of highly sensitive, ratiometric emissive noncontact thermometer. By the integration of emission intensity in the two spectral ranges i.e. 1500 nm for TE and 1060 nm for Nd3+ a ratiometric luminescent thermometer can be created
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