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:
Oct. 12, 2004
Filed:
Sep. 25, 2003
Hiroshi Nakatani, Tokyo, JP;
Tatsuya Kimura, Tokyo, JP;
Yoshito Sameda, Kanagawa-ken, JP;
Takuya Iijima, Tokyo, JP;
Takashi Higuchi, Tokyo, JP;
Makoto Futoo, Kanagawa-ken, JP;
Hiroaki Nojiri, Tokyo, JP;
Kiyonori Nishikawa, Tokyo, JP;
Toshihiko Okamoto, Saitama-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
The invention consists in a capacitative electromagnetic flow meter in which excitation is performed at a frequency above the commercially available frequency and having a characteristic correction filter that corrects the gain frequency characteristic of the exciting current such that the exciting flux waveform has a flat section. In the detection unit, the value of the electrostatic capacitance between the face electrodes A, B and guard electrodes A, B is made smaller than the value of the electrostatic capacitance between the detecting face electrodes A, B and the fluid to be measured. The exciting coils are fixed to a cylindrical yoke, being electrostatically screened by coil fixing plates. Fixing by an earth ring is performed with this cylindrical yoke and the two ends of the measurement tube being symmetrical with respect to the tube axis and electrode axes. In addition, fixing is effected by filling the entire interior of the detection unit with epoxy resin.