The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2011
Filed:
Dec. 29, 2005
Fujio Oonishi, Yokohama, JP;
Kenichi Shinbo, Yokohama, JP;
Ritsuro Orihashi, Tokyo, JP;
Yasushi Terui, Tsuchiura, JP;
Tsukasa Shishika, Hitachinaka, JP;
Fujio Oonishi, Yokohama, JP;
Kenichi Shinbo, Yokohama, JP;
Ritsuro Orihashi, Tokyo, JP;
Yasushi Terui, Tsuchiura, JP;
Tsukasa Shishika, Hitachinaka, JP;
Hitachi High-Technologies Corporation, Tokyo, JP;
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.