Measurement of air temperature fields in radiative environments using optical fibers

Air temperature measurement is important in fields such as meteorology, comfort, thermal conditioning, and numerical model validation. However, in highly radiant environments, thermal radiation is a challenge and can lead to significant errors in air temperature measurements. Current approaches, including reducing sensor size or surface emissivity, using radiation shields, and applying correction models, partially address this issue but fail to completely suppress the errors caused by infrared radiation. In this paper, we propose a novel measurement method based on Raman scattering using thin aluminum-coated optical fibers. This method offers significant advantages over traditional sensors in highly radiant environments and provides more representative air temperature measurements. We demonstrate the effectiveness of this approach through comparative analysis and experimental results. An in-situ measurement using these optical fibers was carried out to reconstruct the 3D temperature distribution in a full-scale room specifically designed for thermo-aeraulic tests.