J. Laakmann et al., COMBINED TIME-OF-FLIGHT AND MASS-SPECTROSCOPY FOR DETERMINATION OF THE TEMPERATURE OF UNDERCOOLED MELTS, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 178(1-2), 1994, pp. 93-97
Determination of the temperature of electromagnetically undercooled me
lts processed in a high vacuum by optical pyrometry is very limited ow
ing to contamination of the optical viewing ports into the processing
chamber. A new method for non-contacting, non-optical temperature meas
urement was investigated with respect to its feasibility. Here, the en
ergy distribution of the evaporating particles, which is of Maxwell-Bo
ltzmann type, is determined by measuring the particle velocity distrib
ution with the help of a time of flight (TOF) process and the particle
masses with a quadrupole mass spectrometer. The first experimental re
sults for a solid MnBi alloy agree well with theoretical predictions f
itted to simultaneously determined thermocouple readings.