| US 7,487,052 B2 | ||
| State detection device | ||
| Tomoshige Yamamoto, Tokyo (Japan) | ||
| Assigned to Yamatake Corporation, Tokyo (Japan) | ||
| Appl. No. 11/662,306 PCT Filed Sep. 21, 2005, PCT No. PCT/JP2005/017409 § 371(c)(1), (2), (4) Date Mar. 08, 2007, PCT Pub. No. WO2006/033365, PCT Pub. Date Mar. 30, 2006. |
||
| Claims priority of application No. 2004-275249 (JP), filed on Sep. 22, 2004. | ||
| Prior Publication US 2008/0028867 A1, Feb. 07, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G06F 19/00 (2006.01); G01N 11/00 (2006.01); G01L 7/00 (2006.01) | ||
| U.S. Cl. 702—50 [702/38; 702/100; 73/1.16; 73/700; 73/861.12] | 15 Claims |
| 1. A state detection device characterized by comprising:
a measuring tube through which a fluid flows;
an exciting unit which applies, to the fluid, a time-changing magnetic field asymmetrical to a first plane perpendicular to
an axial direction of said measuring tube;
an electrode which is placed on the first plane in said measuring tube to detect a resultant electromotive force of an electromotive
force based on a ∂A/∂t component (A: vector potential, t: time) irrelevant to a flow velocity of the fluid and an electromotive
force based on a v×B component (v: flow velocity, B: magnetic flux density) originating from the flow velocity of the fluid,
the resultant electromotive force being generated by the magnetic field applied to the fluid and a flow of the fluid; and
a state quantifying unit which extracts the ∂A/∂t component from the resultant electromotive force detected by said electrode,
extracts, from the ∂A/∂t component, a variation factor dependent on a parameter to be detected, and quantifies the parameter
on the basis of the variation factor,
wherein the parameter is at least one of a characteristic and state of the fluid and a state in said measuring tube.
|