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PHYSICAL STATE MEASUREMENT DEVICE NEW

外国特許コード F210010592
整理番号 (S2020-0261-N0)
掲載日 2021年11月4日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2021JP010756
国際公開番号 WO 2021200144
国際出願日 令和3年3月17日(2021.3.17)
国際公開日 令和3年10月7日(2021.10.7)
優先権データ
  • 特願2020-064574 (2020.3.31) JP
発明の名称 (英語) PHYSICAL STATE MEASUREMENT DEVICE NEW
発明の概要(英語) Provided is a physical state measurement device capable of removing the influence of disturbing noise and stably measuring a physical state. This physical state measurement device comprises a light source unit 10, a main solid material 20, a microwave application unit 30, a detection unit 40, a feedback unit 50, and a static magnetic field application unit 70. The main solid material 20 fluoresces due to excitation light from the light source unit 10. The microwave application unit 30 applies microwaves to the main solid material 20 in order to control the electronic state of the main solid material 20. The detection unit 40 detects the physical state of a measurement target via the fluorescence of the main solid material 20. The feedback unit 50 has a solid material for feedback 51 and a control unit 53. The feedback unit 50 detects the amplitude difference between a low frequency side of a decrease portion, and an operating point of a high-frequency side of a spectrum amplitude centered on the resonance frequency of the electron spin resonance spectrum of the fluorescence of the solid material for feedback 51, and performs feedback control of the microwave application unit 30 so that said difference is zero.
従来技術、競合技術の概要(英語) BACKGROUND ART
Diamond sensors using nitrogen-hole center (NV center) in the crystal of diamond are known. The NV center can detect the spin state at room temperature, and is expected to be applied to magnetometric sensors and physical state measurements. The NV center shows intense red fluorescence when excited by a green laser beam. Because this fluorescence intensity reflects the spin state, it is possible to measure the physical state by accurately detecting the fluorescence intensity of the NV center.
An apparatus for measuring the magnetism of a biological sample, such as a cell, using two resonance frequencies on the electron-spin resonance spectrum of the NV center of a diamond sensor is also known. Specifically, the spectrum of fluorescent light generated by excitation light of the NV center is configured to have peaks (lowered portions) of two resonance frequencies that are Zeman split by application of a static magnetic field. The interval between the two peaks is known to increase or decrease due to a magnetic field. Thus, magnetic measurement is possible by measuring changes in the positions of the two peaks.
In the magnetometric measuring apparatus that uses magnetic resonance as described above, it is also known that not only the interval between the two Zeman split sections of reduced resonance frequencies increases and decreases due to the magnetic field, but also that the two Zeman split sections move parallel to each other due to temperature. There is a magnetometric measuring device under patent application that includes the inventors and applicant of the present application as a device capable of measuring a magnetic image without this effect of translation caused by temperature (Patent Document 1). In this case, in the field of view of the diamond sensor, the fluorescence intensity of fluorescence at the NV center is detected for each of pixels arranged two-dimensionally in a CMOS area sensor, for example, and captured as an image. The capturing timing is such that four fluorescence images are captured at the frequencies of the two maximum inclination points on the low frequency side and the high frequency side of the declines of the two resonance frequencies, that is, at the frequencies of the four maximum inclination points. At this time, feedback control is performed so that the fluorescence intensity in the visual field of the image sensor is kept constant from the initial state. This makes it possible to follow the fluctuations in the positions of the two resonance frequencies and eliminate the effects of fluctuations in the excitation light intensity. Additionally, repeated fluorescent image exposure at frequencies of four maximum inclination points makes it possible to eliminate external magnetic noise and temperature noise at frequencies lower than the repetition frequency.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • TOKYO INSTITUTE OF TECHNOLOGY
  • 発明者(英語)
  • HATANO, Yuji
  • IWASAKI, Takayuki
  • HATANO, Mutsuko
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS IT JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN WS ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL ST SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN TD TG
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