Publication | Open Access
A photoelectric recording interferometer for measurement of dimensional changes
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1951
Year
A me thod is given for the photoelectric reco rding of light intensity at a refere nce point in an imarre of an interference pattern for the automatic plotting of friDge count versus thermocouple elcctromotive force in interferometric dilatometry. Appli cation of the technique to the measurement of coefficicnts of expan sion and to the determination of t ransit ion te mperatures in rubber-like materials over a temperature range of -185 0 to + 185 0 C is given. Transition s can be located to a precision of 0.5 degree C and coefficients of expan sion found to a precision of 5 percent.