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Molecular tagging thermometry with adjustable temperature sensitivity

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Abstract

We report an extension to the technique of molecular tagging thermometry which allows for adjustable temperature sensitivity. The temperature dependence of laser-induced phosphorescence of the water-soluble phosphorescent triplex (1-BrNp•Mβ-CD•ROH) is used to conduct temperature measurements in aqueous flows. It is shown that the temperature sensitivity of phosphorescence intensity can be adjusted by changing the time delay between the laser excitation pulse and the start of the phosphorescence emission acquisition. For example, for a phosphorescence integration period of 1 ms, the temperature sensitivity of the measured phosphorescence intensity varies in the range 8.15–18.2% per °C at 25°C as the time delay changes from 1 to7 ms. This temperature sensitivity is much higher than that of most fluorescent dyes used for temperature measurements (e.g. less than about 2% per °C for Rhodamine B). The implementation and application of this new approach are demonstrated by conducting temperature measurements in the wake of a heated cylinder.

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Acknowledgements

This work was supported by the CRC Program of the National Science Foundation, Grant Number CHE-0209898, and made use of shared facilities of the MRSEC Program of the National Science Foundation, Award Number DMR-9809688.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Iowa State University, Ames, IA, 50011, USA

    H. Hu

  2. Department of Mechanical Engineering, Michigan State University, East Lansing, MI, 48824, USA

    M. Koochesfahani & C. Lum

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  1. H. Hu
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  2. M. Koochesfahani
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  3. C. Lum
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Correspondence to H. Hu.

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Hu, H., Koochesfahani, M. & Lum, C. Molecular tagging thermometry with adjustable temperature sensitivity. Exp Fluids 40, 753–763 (2006). https://doi.org/10.1007/s00348-006-0112-2

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