Title:
応力センサ
Document Type and Number:
Japanese Patent JP4174323
Kind Code:
B2
Abstract:
A stress or magnetic field sensor comprising a generally elongate magnetically soft amorphous or nanocrystalline electrically resistive element and biasing means for applying to the element a bias magnetic field of which the component directed along the length of the sensor has an amplitude variation pattern along the element. A periodically varying pattern has the effect of reducing the sensitivity of a stress sensor to external ambient fields (FIG. 3 shows that with a sawtooth bias field the sensitive portions a of a sensor move to positions b in the presence of an ambient field, but their number remains the same). A ramped bias field enables the position of the sensitive region of the sensor to be controlled, for measuring local stress, or for mapping an external magnetic field. Control of the regions where the sensor is active may include selective conductive coating of portions of its length. Potential uses of the stress sensor include a pressure sensor, embedment in moving parts (using rf communication) such as vehicle tyres, aircraft wings or machine parts, and in structures such as bridges where stray magnetic fields are a problem.
Inventors:
Tomka George Gili
Gore Jonathan Joffrey
Meyrin Mark Gregory
Milne James Curl
Gore Jonathan Joffrey
Meyrin Mark Gregory
Milne James Curl
Application Number:
JP2002575597A
Publication Date:
October 29, 2008
Filing Date:
March 20, 2002
Export Citation:
Assignee:
QINETIQ LIMITED
International Classes:
G01L1/00; G01L1/12; G01L5/00; G01L17/00; G01M5/00
Domestic Patent References:
| JP61240132A |
Foreign References:
| US4782705 | ||||
| US4812758 | ||||
| US4924711 |
Other References:
Wirelessly Interrogable Magnetic Field Sensor Utilizing Giant Magneto-Impedance Effect and Surface Acoustic Wave Devices,IEEE Transactions on Instrumentation and Measurement Vol.49 No.3,米国,2000年 6月,Vol.49 No.3 ,Page.648-652
Comparative Study of the Giant Magneto-Impedance Effect in CoFeSiB Glass-Covered and Cold-Drawn Amorphous Wires,EEE Transactions on Instrumentation and Measurement Vol.33 No.5,米国,1997年 9月,Vol.33 No.5, Page.3352-3354
Passive wirelessly requestable sensors for magnetic field measurements,Sens Actuators Vol.A85 No.1/3,スイス,2000年 8月25日,Vol.A85 No.1/3,Page.169-174
Comparative Study of the Giant Magneto-Impedance Effect in CoFeSiB Glass-Covered and Cold-Drawn Amorphous Wires,EEE Transactions on Instrumentation and Measurement Vol.33 No.5,米国,1997年 9月,Vol.33 No.5, Page.3352-3354
Passive wirelessly requestable sensors for magnetic field measurements,Sens Actuators Vol.A85 No.1/3,スイス,2000年 8月25日,Vol.A85 No.1/3,Page.169-174
Attorney, Agent or Firm:
Minoru Nakamura
Fumiaki Otsuka
Sadao Kumakura
Shishido Kaichi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo
Takaki Nishijima
Atsushi Hakoda
Fumiaki Otsuka
Sadao Kumakura
Shishido Kaichi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo
Takaki Nishijima
Atsushi Hakoda