Compensating for a measured variation in length of a flight...

Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means

Reexamination Certificate

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Reexamination Certificate

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11333744

ABSTRACT:
A mass spectrometer system comprises a flight tube having an operational length, a measurement device for measuring a variation in the longitudinal length of the flight tube, means for compensating for the measured variation in the longitudinal flight tube length, and a detector positioned near a downstream end of the flight tube. The measurement device comprises an optical interferometer, and may specifically comprise a Michelson interferometer. In a first embodiment, the mass spectrometer system includes an actuator coupled to the measurement device and the detector for moving the detector in a longitudinal direction to compensate for the measured variation in the operational flight tube length. In a second embodiment, the mass spectrometer system includes a processor coupled to the measurement device configured to calculate analyte ion mass to charge ratio. The processor is configured to modify a calculation of analyte ion mass to charge ratio using the measured variation in operational flight tube length.

REFERENCES:
patent: 6013913 (2000-01-01), Hanson

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