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

外国特許コード F110003697
整理番号 B15-03WO
掲載日 2011年7月1日
出願国 欧州特許庁(EPO)
出願番号 06796418
公報番号 1952763
公報番号 1952763
出願日 平成18年8月14日(2006.8.14)
公報発行日 平成20年8月6日(2008.8.6)
公報発行日 平成28年11月23日(2016.11.23)
国際出願番号 JP2006316028
国際公開番号 WO2007055057
国際出願日 平成18年8月14日(2006.8.14)
国際公開日 平成19年5月18日(2007.5.18)
優先権データ
  • 特願2005-325064 (2005.11.9) JP
  • 2006JP316028 (2006.8.14) WO
発明の名称 (英語) Method and apparatus for measuring characteristic of object with acoustically induced electromagnetic wave
発明の概要(英語) (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).
特許請求の範囲(英語) [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.
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • IKUSHIMA KENJI
  • KOMIYAMA SUSUMU
国際特許分類(IPC)
指定国 (EP1952763)
Contracting States: DE
参考情報 (研究プロジェクト等) SORST Selected in Fiscal 2001
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