Top > Quick Search > Search International Patent > Method and apparatus for measuring characteristic of object with acoustically induced electromagnetic wave

Method and apparatus for measuring characteristic of object with acoustically induced electromagnetic wave

Foreign code F110003697
File No. B15-03WO
Posted date Jul 1, 2011
Country EPO
Application number 06796418
Gazette No. 1952763
Gazette No. 1952763
Date of filing Aug 14, 2006
Gazette Date Aug 6, 2008
Gazette Date Nov 23, 2016
International application number JP2006316028
International publication number WO2007055057
Date of international filing Aug 14, 2006
Date of international publication May 18, 2007
Priority data
  • P2005-325064 (Nov 9, 2005) JP
  • 2006JP316028 (Aug 14, 2006) WO
Title Method and apparatus for measuring characteristic of object with acoustically induced electromagnetic wave
Abstract (EP1952763)
A measuring method and apparatus in which a measurable object (23) is irradiated with acoustic waves to measure a change in property value of charged particles in the object from electromagnetic waves induced thereby.
A part (2) of the measurable object irradiated with an acoustic focused beam (1) is in a charge distribution state in which positive charged particles (3) are greater in number in the part (2) where electromagnetic waves induced by positive charged particles (3) are not canceled by those induced by negative charged particles (4) and where net electromagnetic waves (6) are induced.
Since a change in concentration of positive charged particles (3) and/or negative charged particles (4) changes the intensity of electromagnetic waves (6), it is possible to know such a change in concentration of the charged particles from a change in intensity of electromagnetic waves (6).
Scope of claims [claim1]
1. A method of measuring a property of an object with acoustically induced electromagnetic waves comprising the steps of: irradiating a measurable object (23) with acoustic waves (26); and measuring electromagnetic waves (27) generated from said measurable object (23) to determine any one of properties of the object, including its electrical, magnetic and electromagnetic mechanical properties, from any one or a combination of strength, phase and frequency characteristics of said electromagnetic waves; characterized in that the acoustic waves (26) with which said measurable object (23) is irradiated are in the form of: acoustic waves of a fixed frequency in a narrow band or acoustic wave pulses of a fixed frequency in a narrow band, in which cases said electromagnetic waves are measured by heterodyne or phase detection of the electromagnetic waves radiated from said measurable object with the fixed frequency of said acoustic waves as a reference signal and the heterodyne or phase detection of a signal resulting from said detection with a frequency of said acoustic waves; or acoustic wave pulses of a fixed frequency in a narrow band, in which case said electromagnetic waves are measured by heterodyne or phase detection of the electromagnetic waves radiated from said measurable object with the repetition frequency of said acoustic wave ; pulses as a reference signal and the heterodyne or phase detection of a signal resulting from said detection with a pulse repetition frequency of said pulses.
[claim2]
2. A method according to claim 1, wherein from phase information of said phase detection it is determined whether said electromagnetic wave signals are originated from positively charged particles (3) or negatively charged particles (4) possessed by said object to be measured.
[claim3]
3. A method according to claim 1, wherein a signal of said electromagnetic waves is measured that is isolated with respect to time from electromagnetic noises occurring at a source of emission of said acoustic wave pulses by choosing a time period for a said acoustic wave pulse to propagate over a distance between the emission source of said acoustic wave pulses and said measurable object so as to be longer than a pulse duration of said acoustic wave pulse or by making said pulse duration shorter than said time period for the acoustic wave pulse to propagate.
[claim4]
4. A method according to claim 1, wherein said measurable object is irradiated with acoustic waves by focusing acoustic waves from a plurality of sources on a desired small part of said measurable object and electromagnetic waves induced at said small part are measured with an antenna or coil means (28) disposed to surround said measurable object whereby acoustic waves are focused on a desired part from a desired direction and electromagnetic waves radiated from a desired position towards a desired direction is measured while their radiation bearing distribution is determined.
[claim5]
5. A method according to claim 4, wherein focusing acoustic waves are scanned over a two-dimensional surface or three-dimensional volume of said measurable object and an intensity of induced electromagnetic waves at each scanning position is measured using an antenna or coil means (28) surrounding said measurable object to determine a two-dimensional or three-dimensional distribution of changes in a property value of charged particles of said object.
[claim6]
6. A method according to any preceding claim, wherein said measurable object is of any one of materials selected from the group which consists of colloidal solution, liquid crystal, solid electrolyte, ionic crystal, semiconductor, dielectric, metal, magnetic material and magnetic fluid or a composite material thereof or a structure or a functional device composed of such a material, in which a change in property value of charged particles is measured.
[claim7]
7. An apparatus (21) for measuring a property of an object with acoustically induced electromagnetic waves, the apparatus comprising: an anechoic chamber (22), a retainer table (24) for holding a measurable object (23) disposed in said anechoic chamber, an acoustic generator (25) disposed adjacent or in contact with said object, an antenna or coil means (28) for receiving electromagnetic waves (27) generated from a part which is irradiated with acoustic waves or pulses (26) produced by said acoustic generator (25), and a control, measure and process unit (29) for driving and controlling said acoustic generator and for measuring and processing electromagnetic waves (27) received by said antenna or coil means characterized in that the acoustic generator (25) is adapted to produce: acoustic waves of a fixed frequency in a narrow band or acoustic wave pulses of a fixed frequency in a narrow band, in which cases said electromagnetic waves are measured in use by said control, measure and process unit (29) by heterodyne or phase detection of the electromagnetic waves (27) radiated from said measurable object (23) with the fixed frequency of said acoustic waves as a reference signal and heterodyne or phase detection of a signal resulting from said detection with a frequency of said acoustic waves; or acoustic wave pulses of a fixed frequency in a narrow band, in which case said electromagnetic waves are measured in use by said control, measure and process unit (29) by heterodyne or phase detection of the electromagnetic waves (27) radiated from said measurable object (23) with the repetition frequency of said acoustic wave pulses as a reference signal and the heterodyne or phase detection of a signal resulting from said detection with a pulse repetition frequency of said pulses.
[claim8]
8. An apparatus according to claim 7, wherein said acoustic generator (25) comprises a plurality of acoustic generators or a plurality of acoustic generators fixed on a concaved surface whose normal is focused on a point whereby
acoustic wave pulses generated from said acoustic generators are controlled of their mutual phase by said control, measure and process unit (29) so as to be focused on a desired position of said measurable object (23) and the focusing position of acoustic waves is scanned over a two-dimensional surface or three-dimensional volume of said measurable object or said acoustic generators are scanned mechanically around said measurable object to scan the focusing position of acoustic waves over a two-dimensional surface or three-dimensional volume of said measurable object.
[claim9]
9. An apparatus according to claim 7 or claim 8, wherein said control, measure and process unit (29) includes a SQUID for detecting a magnetic field.
  • Applicant
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • Inventor
  • IKUSHIMA KENJI
  • KOMIYAMA SUSUMU
IPC(International Patent Classification)
Specified countries (EP1952763)
Contracting States: DE
Reference ( R and D project ) (In Japanese)SORST Selected in Fiscal 2001
Please contact us by E-mail or facsimile if you have any interests on this patent.

PAGE TOP

close
close
close
close
close
close