Method and apparatus for the automatic measurement of start time of evaporation of barium getter devices
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United States of America Patent
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Aug 18, 1992
Grant Date -
N/A
app pub date -
Apr 11, 1991
filing date -
Apr 11, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is described for the automatic determination of the time when barium starts to evaporate, or 'start time', of barium evaporable getters. A temperature difference measurement is made of the temperature of the glass wall outside the getter location by means of a sensor preferably comprising an infrared pyrometer calibrated on a wave length of about 10 .mu.m suitable for measuring temperatures of 0.degree.-500.degree. C. Under these conditions the temperature curve measured, through an integral function, follows the behavior of the temperature of the getter which reveals a typical behavior at the moment in which barium starts to evaporate. Once .DELTA.T has been calculated from the analysis of a series of experimental test results on the integral curve, that value corresponds to the start time. The measurement of temperature is transformed into a suitably amplified voltage this giving a value of V corresponding to the start time. This can then be used to automatically regulate the R.F. generator power level to obtain a constant start time or to regulate the total time of evaporation of the getter so as to obtain a constant barium yield.
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