2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/16/2017 | 4:55 PM - 5:20 PM | Dual fiber-based modulated optical reflectance technique development | 1
Dual fiber-based modulated optical reflectance technique development
A new dual fiber-based modulated optical reflectance configuration has been developed to measure thermal diffusivity by sampling over a range of modulation frequencies. The technique retains the fiber-based heating laser (pump) and detection laser (probe) in close proximity at a fixed separation distance in a ceramic ferrule. The pump beam periodically heats the sample inducing thermal waves while the probe beam measures the temperature response at a known distance from the pump beam. The thermal diffusivity of the sample may be calculated from the phase response between the input heat flux and the temperature response of a sample having a reflective surface. The unique measurement configuration is ideal for in situ measurements and has many advantages for laboratory-based systems. The system has been used to measure thermal diffusivities of Ge and SiC within 10% of reported literature values.
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Presenters/Authors
Charles Folsom
(), Utah State University, charlie.folsom@aggiemail.usu.edu;
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Austin Fleming
(), Utah State University, austin.d.fleming@aggiemail.usu.edu;
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Heng Ban
(), Utah State University, heng.ban@usu.edu;
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