title: Probe beam size effect on the measurement of the distance between the probe beam and the sample in photothermal deflection.
abstract: A distance-scan method to determine the distance between the probe beam and sample, which is not easily measured exactly, in photothermal deflection (PD) was reported, with which the distance and thermal diffusivity of the deflecting medium can be simultaneously measured. Probe beam size effect (PBSE) on PD phase signal was quantitatively analyzed to clearly show its physical meaning. The measured distance was experimentally verified as correct and reliable, and the measured thermal diffusivities of N2 and CO2 are in good agreement with the literature values. They could not be precisely measured by phase signal without considering the PBSE.
authors.affiliation: National Research Council of Canada, Institute for Fuel Cell Innovation, 3250 East Mall, Vancouver, British Columbia, V6T 1W5, Canada.
authors.forename: Jurandir H
authors.initials: JH
authors.lastname: Rohling
authors.forename: Jun
authors.initials: J
authors.lastname: Shen
authors.forename: Jianqin
authors.initials: J
authors.lastname: Zhou
authors.forename: Caikang Elton
authors.initials: CE
authors.lastname: Gu