Laser-Based Measurement of Temperature or Concentration Change at Liquid Surfaces  

Oleh:

Fan, C. H. ; Longtin, J. P.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 122 no. 4 (Nov. 2000), page 757-762.
Topik: LIQUIDS; laser - based measurement; temperature; concentration change; liquid surfaces

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.4 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

This work presents a noncontact laser - based thermoreflectance technique to measure changes in temperature or concentration at a liquid surface. Changes in temperature and, for multi - component liquid mixtures, concentration result in a change in the liquid index of refraction, which alters the reflectivity of the liquid surface. An intensity - stabilized diode laser and silicon photodiode are used to monitor the surface reflectivity. Temperature variations in 1 - propanol, methanol, ethanol, and water are measured with uncertainties of 0.5, 0.7, 0.7, and 3.7° C, respectively. For binary mixtures, the concentration of a methanol - propanol mixture is measured with an uncertainty of 0.3 percent. The experimental configuration is noninvasive, simple in design, and inexpensive. The technique can be used over a wide range of time scales, ranging from micro - seconds to minutes, and can achieve high spatial resolution by focusing the probe laser beam to a small spot size on the liquid surface.

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