Measurement of a photocathode current
AssigneeApplied Materials Israel Ltd.
InventorAlexey Mestezky
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Abstract
A measurement device for measuring a photocathode current of a photomultiplier tube, the measurement device includes: (a) a voltage amplifier configured to amplify a shunt resistor voltage proportional to the photocathode current; (b) a leakage tolerant circuit configured to generate a first leakage tolerant voltage, based on a first amplified voltage and a first reference voltage having an absolute value that exceeds an absolute value of a leakage associated with the measurement device; (c) a voltage to current transducer that is configured to convert the first leakage tolerant voltage to a first leakage tolerant current; and (d) an output unit that is configured to convert the first leakage tolerant current to an output voltage that is indicative of the photocathode current.
Claims15
A measurement device for measuring a photocathode current of a photomultiplier tube, the measurement device comprising:
- a voltage amplifier configured to amplify a shunt resistor voltage that is proportional to the photocathode current to provide a first amplified voltage;
- a leakage tolerant circuit configured to generate a first leakage tolerant voltage, based on the first amplified voltage and a first reference voltage having an absolute value that exceeds an absolute value of a leakage associated with the measurement device;
- a voltage-to-current transducer configured to convert the first leakage tolerant voltage to a first leakage tolerant current;
- and
- an output unit configured to convert the first leakage tolerant current to an output voltage indicative of the photocathode current.
A method for measuring a photocathode current of a photomultiplier tube, the method comprising:
- amplifying, by a voltage amplifier, a shunt resistor voltage that is proportional to the photocathode current to provide a first amplified voltage;
- generating, by a leakage tolerant circuit, a first leakage tolerant voltage, based on the first amplified voltage and a first reference voltage having an absolute value that exceeds an absolute value of a leakage associated with the measurement device;
- converting, by a voltage-to-current transducer, the first leakage tolerant voltage to a first leakage tolerant current;
- and
- converting, by an output unit, the first leakage tolerant current to an output voltage that is indicative of the photocathode current.
Dependencies are inferred from the claim text.