Title:
MAGNETIC DISPLACEMENT SENSOR WITH HIGH ACCURACY AND HIGH STABILITY UNDER PRESENCE OF ELECTROMAGNETIC INTERFERENCE
Document Type and Number:
Japanese Patent JP2021135288
Kind Code:
A
Abstract:
To provide a magnetic displacement sensor with high accuracy and high stability under presence of electromagnetic interference.SOLUTION: An accurate and stable displacement sensor that reads through coated metal substrates achieves accuracy better than one micron includes: an electromagnetic coil 18 positioned in a first housing 4; (ii) means for generating a magnetic field from the electromagnetic coil; (iii) a second housing 6 which is spaced apart from the first housing and includes dual magnetic sensors 20 and 22, such as fluxgate sensors, that are configured to measure the magnetic field; and (iv) means for calculating separation between operative surfaces of the housings from magnetic field measurement values. A permanent magnet can be used instead of the electromagnetic coil and an associated driving energy source. Precise displacement measurement is given by a mathematical function (such as ratio or difference) of the two magnetic sensors demodulated signals.SELECTED DRAWING: Figure 1
Inventors:
SEBASTIEN TIXIER
MICHAEL HUGHES
MICHAEL HUGHES
Application Number:
JP2021012240A
Publication Date:
September 13, 2021
Filing Date:
January 28, 2021
Export Citation:
Assignee:
HONEYWELL LTD
International Classes:
G01B7/02; G01B21/08
Domestic Patent References:
| JP2002533661A | 2002-10-08 | |||
| JP2010038597A | 2010-02-18 |
Foreign References:
| US20160123773A1 | 2016-05-05 | |||
| US20050157314A1 | 2005-07-21 |
Attorney, Agent or Firm:
Osamu Yamamoto
Toru Miyamae
Junichi Matsuo
Omaki Ayako
Toru Miyamae
Junichi Matsuo
Omaki Ayako