Validation of phosphor thermometry for industrial surface temperature measurements

Abstract

Surface temperature measurements are required by the aerospace and automotive industries to guarantee high-quality products and optimize production processes. Accurate and reliable measurement of surface temperature is very challenging in an industrial environment. Surface contact probes are widely used but poorly characterized, while non-contact infrared thermometry is severely hampered by the unknown emissivity of the surface and by problems caused by stray radiation from the background. An alternative approach to the above techniques is phosphor thermometry, used here in a hybrid contact/non-contact approach. In this work, the development of a lifetime-based phosphor thermometer, its application to industrial surface temperature measurement and its validation are reported in a metrologically sound manner. The phosphor thermometer was initially calibrated by contact on a reference calibrator system at the Istituto Nazionale di Ricerca Metrologica to provide SI traceability to the measurements at the industrial level; the system was later validated by exploiting a metal phase-change method. The robustness of the approach against a strong radiative background was also investigated. A comprehensive uncertainty analysis was carried out, resulting in an expanded uncertainty (k = 2) lower than 1.4 °C over the temperature range from the ambient to 450 °C. The phosphor-based thermometer was then tested at industrial manufacturing premises to measure the surface temperature of aluminium alloy billets during the pre-heating phase before forging. The phosphor-based approach was compared with radiation and contact thermometry in both static and dynamic measurement conditions. The experimental results proved that phosphor thermometry, besides being a valid alternative to conventional techniques, may offer better performance in an industrial setting.

Going Above and Beyond: A Tenfold Gain in the Performance of Luminescence Thermometers Joining Multiparametric Sensing and Multiple Regression

“…Temperature is a physical quantity that measures the thermal energy of a body, [1] and temperature fluctuations play a central role in a myriad of natural and man-made processes. [2][3][4] Since the time-response of a thermometer is limited by its size, the realtime measurement of temperature at the microscopic scale is DOI: 10.1002/lpor.202100301 hindered by the dimensions of the thermal probe. The size effect motivates the development of novel solutions for temperature determination at the submicrometer scale, in particular, luminescent nanothermometry is based on the emission properties of luminescent nanomaterials and thus allows a remote temperature detection, improving spatial and temporal resolutions in comparison with the macroscopic counterparts.…”

Rationalizing the Thermal Response of Dual‐Center Molecular Thermometers: The Example of an Eu/Tb Coordination Complex

“…[26] Indeed, thermographic phosphor thermometry was compared with radiation and contact thermometry in an industrial setting and the results proved that the approach is an effective alternative to conventional techniques offering better performance. [27] Furthermore, in the last couple of years, the technique started to be used as a tool for unveiling properties of the thermometers themselves or of their local surroundings, as, for instance, the estimation of the absorption coefficient and thermal diffusivity of tissues, [28] the determination of the Brownian velocity of colloidal nanocrystals [29] and thermal properties of nanoparticles, including lipid bilayer coatings, [30][31][32] and the measurement of the phase transition temperature of perovskite oxides. [33] Among the different proposed methodologies to measure the absolute temperature using light emission, the most popular relies on measuring the intensity ratio of two electronic transitions in thermal equilibrium.…”

Study of ZnS:Mn2+,Te2+ phosphor for improving the hue rendering indicator of WLEDs

“…This research used the LightTools software along with the Mie-hypothesis for purpose of building the LED layout, in which the accuracy of the findings must be double-checked [16]- [19]. After all the data on the scattering properties of phosphor particles used to support research on the influence of phosphorus ZnS:Mn 2+ ,Te 2+ on WLED at a high correlation temperature of 5600 K has been gathered, simulate WLEDs with double-layer phosphorus without delay.…”

“…1939 steady and effective red-colored CdSe/ZnS QDs with the YAG:Ce 3+ phosphorus is a critical decision for increasing the WLED hue standard. QDs must stay within polymeric matrices to avoid oxidizing caused by the environment and to continue using the standard packaging technique for WLEDs [19], [20]. To acquire QD PiG adapters for distant-kind WLEDs, a QD-polymeric coating was created then applied to YAG:Ce 3+ PiG structure [21].…”