Title: Heat unit integrator for X-ray tubes

Abstract: Apparatus to indicate the temperature of an X-ray tube target includes an analog storage circuit to simulate the heat energy stored. Input signals representing the current and the voltage of the electron beam in the tube are multiplied to give a signal representing the instantaneous power input. The power signal is integrated in the storage circuit to give a temperature signal representing the total heat input. The temperature signal is dissipated by a cooling curve circuit representing the heat loss with time. An indicator reads the temperature signal. Input voltage and current signals are processed to refer them to ground before multiplication. The current signal is corrected to set its zero value. The voltage signal derived from a transformer primary is corrected for transformer regulation. To eliminate spurious inputs the power signal is gated to the storage circuit only when a measured current is flowing. Multiple storage circuits indicating a number of tubes remember the temperature of their own targets while the power signal and the temperature indicator are being used with another storage circuit.

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Inventors: Perry, John T. (Salt Lake City, UT, US)
Schmutzer, Joel J. (Oak Park, IL, US)

Application Number: 525423
Filing Date: 1974-11-20
Publication_date: 1976-06-01
Assignee: Varian Associates (Palo Alto, CA)
Primary Class(es): 703/4 324/142, 361/103, 378/98, 378/118
Other Classes:
US Patent Ref:

3634871	Jan, 1972	Siedband et al.	317/40.
3746851	Jul, 1973	Gilbert	324/142.
3747605	Jul, 1973	Cook	324/142.
3764908	Oct, 1973	Elms	324/142.
3766391	Oct, 1973	Siedband et al.	250/403.
3775683	Nov, 1973	Barta et al.	324/142.
3838285	Sep, 1974	Siedband et al.	250/413.

Other Refs:
Primary Examiner: Gruber, Felix D.
Assistant Examiner:
Attorney: Cole; Stanley Z., Herbert; Leon F., Nelson; Richard B.