Temperature and Emissivity of a Shocked Surface: A First Experiment

Poulsen, P ; Hare, D E

Lawrence Livermore National Laboratory

关键词: Spectrometers;    Light Sources;    Wavelengths;    Molybdenum;    Infrared Radiation;   

DOI  :  10.2172/15002512
RP-ID  :  UCRL-ID-146845
RP-ID  :  W-7405-ENG-48
RP-ID  :  15002512

美国|英语

来源: UNT Digital Library

【 摘 要 】

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} = 1.2 {micro}m), 0.10 ({lambda} = 1.6 {micro}m), and 0.20 ({lambda} = 2.3 {micro}m).