Method and apparatus for the automatic measurement of start time

Details Method and apparatus for the automatic measurement of start time Method and apparatus for the automatic measurement of start time

1991-04-11

1992-08-18

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Apparatus

Testing or adjusting means

H01J 942

Patent

active

051394529

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.

REFERENCES:
patent: 4668203 (1987-05-01), Giudici
patent: 4820223 (1989-04-01), Benigni et al.
patent: 4881914 (1989-11-01), Kamp et al.

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