Researchers at the University of Houston have developed a noncontact optical method to measure the temperature of hot

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surfaces with an accuracy better than 1°C (Device, doi: 10.1016/j.device.2024.100467)

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This enhanced technique aims to improve understanding of photothermal catalysts, which use laser heating to initiate chemical reactions.

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Traditional infrared thermometers, while fast and sensitive, struggle with accuracy due to the emissivity of materials varying with wavelength and temperature.

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Traditional infrared thermometers, while fast and sensitive, struggle with accuracy due to the emissivity of materials varying with wavelength and temperature.

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The new approach uses a near-infrared spectrometer to capture the full emission spectrum between 950 and 1600 nm.

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The spectrum is first calibrated at 400°C and compared to a theoretical blackbody curve to account for system response variations.

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The temperature is then determined by fitting the measured spectrum to the blackbody formula.

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Tests with a silver heating stage showed the method achieves accuracy better than 1°C between 200 and 550°C.

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Applied to a laser-heated powder catalyst, it revealed a significant temperature gradient from the surface to 100 µm below.

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Lead author Jiming Bao noted the technique's potential to improve measurements in photothermal reactions and other high-temperature applications.

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