IMPROVEMENTS IN OR RELATING TO VOLTAGE PEAK VALUE COMPARISON CIRCUITS
A voltage peak comparison circuit was invented for the amplitude comparison of small voltage pulses from a mass spectrometer whose magnet current is varied cyclically so that beams of different masses are scanned over the collector plate, The circuit comprises an amplifier of variable gain, a group of condensers to be charged in turn from the amplifier, means for comparing those charges, and means for discharging each condenser by a small amount before recharging, When the beams from two isotopes alternately scan the collector plate, alternate current pulses are set up having a ratio equal to the isotope abundance ratio and are led to the capacitors via the amplifier circuit where their peak voltages are compared by a valve voltmeter and a potentiometer. Since the beam currents are not constant, there is a possible source of error in allowing the capacitors to charge to the highest peak voltage, and means is provided for discharging by a small fraction just before the peak voltage of the scan is reached. (D. L. C.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-14-024342
- OSTI ID:
- 4142476
- Report Number(s):
- GB 843956
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- United Kingdom
- Language:
- English
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