Temperature and wavelength dependent emissivity of a shocked surface: a first experiment

Peter Poulsen; David E. Hare

doi:10.1117/12.459631

15 March 2002 Temperature and wavelength dependent emissivity of a shocked surface: a first experiment

Peter Poulsen, David E. Hare

Proceedings Volume 4710, Thermosense XXIV; (2002) https://doi.org/10.1117/12.459631
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

We have conducted an experiment in which the temperature and the wavelength dependent emissivity of a shocked surface has been measured. In the past, only the thermal emission from the shocked surface has been measured. The lack of knowledge of the emissivity as a function of wavelength leads to uncertainty in converting the measured emission spectrum into a surface temperature. We have developed a technique by which we are able to calculate both the emissivity of the shocked surface over a range of relevant wavelengths and the temperature of the surface. We use a multi-channel spectrometer in combination with a pulsed light source having a known spectrum of infrared radiation. Two separate techniques using a pulse of reflected radiation are employed and described. Both give the same result: An initially polished molybdenum surface that is shocked and partially released has a temperature of 1040 degrees Kelvin and a wavelength ((lambda) ) dependent emissivity of 0.16 ((lambda) =1.2micrometers ), 0.10 ((lambda)

Citation Download Citation

Peter Poulsen and David E. Hare "Temperature and wavelength dependent emissivity of a shocked surface: a first experiment", Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); https://doi.org/10.1117/12.459631

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