The fluoroptic measurement method, recently developed by Wagenaar and coworkers to determine in a contactless manner the temperature of moving particles, has been improved. It now has a higher accuracy (approximately 5%) and can be used for particles that move at higher speeds. In addition, the technique has become much less labor-intensive. Validation has been realized by comparing experimentally determined heat-transfer coefficients for a cylinder in crossflow with predictions of several well-known correlations from the literature. A consistent deviation of less than 10% is observed. This comparison therefore shows the reliability of the fluoroptic measurement method.
Janse, A. M. C., de Jong, X. A., Prins, W., & van Swaaij, W. P. M. (1999). Improvement and validation of the fluoroptic temperature-measurement method. AIChE journal, 45(10), 2087-2096. https://doi.org/10.1002/aic.690451007