Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Reexamination Certificate
2011-04-19
2011-04-19
Johnston, Phillip A (Department: 2881)
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
C250S281000, C073S023370
Reexamination Certificate
active
07928365
ABSTRACT:
For the achievement of data transfer time reduction, removal of noise data, and analytical efficiency improvement in an ADC data processing function of a time-of-flight mass spectrometer, the mass spectrometer comprises a data acquisition circuit including: an A/D converter; a signal intensity addition memory that stores data of ion signals such as a time range and the number of measurements and performs an addition process; a voltage value frequency addition memory that performs an addition process of frequencies of voltage values of the predetermined time range and the number of measurements and stores addition results; a threshold level computation circuit that computes a predetermined threshold level from the results in the memory; a compression memory that extracts only data exceeding the threshold level from the data in the signal intensity addition memory; and a counter that controls a measurement time for data acquisition and the operation of each circuit.
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Japanese Office Action dated Mar. 9, 2010, issued in corresponding Japanese Patent Application No. 2005-050102.
Oonishi Fujio
Orihashi Ritsuro
Shinbo Kenichi
Shishika Tsukasa
Terui Yasushi
Antonelli, Terry Stout & Kraus, LLP.
Hitachi High-Technologies Corporation
Johnston Phillip A
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