title: Two-dimensional fringe probing of transient liquid temperatures in a mini space.
abstract: A 2D fringe probing transient temperature measurement technique based on photothermal deflection theory was developed. It utilizes material's refractive index dependence on temperature gradient to obtain temperature information from laser deflection. Instead of single beam, this method applies multiple laser beams to obtain 2D temperature information. The laser fringe was generated with a Mach-Zehnder interferometer. A transient heating experiment was conducted using an electric wire to demonstrate this technique. Temperature field around a heating wire and variation with time was obtained utilizing the scattering fringe patterns. This technique provides non-invasive 2D temperature measurements with spatial and temporal resolutions of 3.5 μm and 4 ms, respectively. It is possible to achieve temporal resolution to 500 μs utilizing the existing high speed camera.
authors.affiliation: Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
authors.forename: Zhenlan
authors.initials: Z
authors.lastname: Xue
authors.forename: Huihe
authors.initials: H
authors.lastname: Qiu
mesh_terms: D021621:Imaging, Three-Dimensional; D007368:Interferometry / Q000295:instrumentation*; D007834:Lasers; D015203:Reproducibility of Results; D013232:Steel; D013696:Temperature; D013997:Time Factors
chemical_list: D013232:Steel