Patents by Inventor Norihiko Nishizawa
Norihiko Nishizawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20220011221Abstract: A carbon isotope analysis method, including the steps of: generating carbon dioxide isotope from carbon isotope; feeding the carbon dioxide isotope into an optical resonator having a pair of mirrors; applying irradiation light having an absorption wavelength of the carbon dioxide isotope into the optical resonator; adjusting a relative positional relationship between the mirrors so that an optical axis of the irradiation light and an optical axis of light generated by the etalon effect are not matched; measuring the intensity of the transmitted light generated by resonance of carbon dioxide isotope excited by the irradiation light; and calculating the concentration of the carbon isotope from the intensity of the transmitted light. An optical resonator that can be suppressed in the parasitic etalon effect, and a carbon isotope analysis device and a carbon isotope analysis method, by use of the optical resonator, are provided.Type: ApplicationFiled: November 21, 2019Publication date: January 13, 2022Applicants: SEKISUI MEDICAL CO., LTD., NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEMInventors: Kenji YOSHIDA, Shin-ichi NINOMIYA, Hideki TOMITA, Tetsuo IGUCHI, Norihiko NISHIZAWA, Volker SONNENSCHEIN, Ryohei TERABAYASHI
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Publication number: 20220011220Abstract: A light generator including a light source, an optical switch that controls ON/OFF of light from the light source, and a mirror that reflects light from the optical switch and sends the light back to the optical switch. A light generator less in residue in fitting of a ring-down signal, and a radioactive carbon dioxide isotope analysis device and a radioactive carbon dioxide isotope analysis method, by use of the light generator are provided.Type: ApplicationFiled: November 21, 2019Publication date: January 13, 2022Applicants: SEKISUI MEDICAL CO., LTD., NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEMInventors: Kenji YOSHIDA, Shin-ichi NINOMIYA, Hideki TOMITA, Tetsuo IGUCHI, Norihiko NISHIZAWA, Volker SONNENSCHEIN, Ryohei TERABAYASHI
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Patent number: 11025028Abstract: Provided is a carbon isotope analysis device including a carbon dioxide isotope generator provided with a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer including optical resonators having a pair of mirrors, and a photodetector that determines intensity of light transmitted from the optical resonators; and a light generator including a single light source, a first optical fiber that transmits first light from the light source, a second optical fiber that generates second light of a longer wavelength than the first light, the second optical fiber splitting from the first optical fiber and coupling therewith downstream, a first amplifier on the first optical fiber, a second amplifier on the second optical fiber, different in band from the first amplifier, and a nonlinear optical crystal.Type: GrantFiled: August 24, 2018Date of Patent: June 1, 2021Assignees: NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY, SEKISUI MEDICAL CO., LTD.Inventors: Tetsuo Iguchi, Hideki Tomita, Norihiko Nishizawa, Volker Sonnenschein, Ryohei Terabayashi, Atsushi Satou
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Publication number: 20200348227Abstract: Provided are a carbon isotope analysis device high in partial pressure of carbon dioxide isotope in gas sent into as optical resonator, and high in sensitivity performance and analytical accuracy, and an analysis method by use of the carbon isotope analysis device. A carbon isotope analysis device including a carbon dioxide isotope generator provided with a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer including an optical resonator having a pair of mirrors, and a photodetector that determines intensity of light transmitted from the optical resonator; a carbon dioxide trap including a cooler for freezing the carbon dioxide isotope, the carbon dioxide trap being disposed between the carbon dioxide isotope generator and the spectrometer; and a light generator.Type: ApplicationFiled: January 22, 2019Publication date: November 5, 2020Applicants: SEKISUI MEDICAL CO., LTD., NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEMInventors: Atsushi SATOU, Tetsuo IGUCHI, Hideki TOMITA, Norihiko NISHIZAWA
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Publication number: 20200203916Abstract: Provided is a carbon isotope analysis device including a carbon dioxide isotope generator provided with a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer including optical resonators having a pair of mirrors, and a photodetector that determines intensity of light transmitted from the optical resonators; and a light generator including a single light source, a first optical fiber that transmits first light from the light source, a second optical fiber that generates second light of a longer wavelength than the first light, the second optical fiber splitting from the first optical fiber and coupling therewith downstream, a first amplifier on the first optical fiber, a second amplifier on the second optical fiber, different in band from the first amplifier, and a nonlinear optical crystal.Type: ApplicationFiled: August 24, 2018Publication date: June 25, 2020Applicants: NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY, SEKISUI MEDICAL CO., LTD.Inventors: Tetsuo IGUCHI, Hideki TOMITA, Norihiko NISHIZAWA, Volker SONNENSCHEIN, Ryohei TERABAYASHI, Atsushi SATOU
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Patent number: 10557790Abstract: A method and apparatus for analyzing carbon isotope 14C is provided. A carbon isotope analyzer including an isotopic carbon dioxide generator to generate isotopic carbon dioxide from a carbon isotope; a spectrometer including an optical resonator having a pair of mirrors, and a photodetector to determine the intensity of light transmitted from the optical resonator; and a light generator including a light source, a first optical fiber to transmit a light beam from the light source, a second optical fiber for wavelength conversion, the second optical fiber branching from the first optical fiber at a point and combining with the first optical fiber at another point downstream of the branching point, and a non-linear optical crystal to generate light having the absorption wavelength of the isotopic carbon dioxide on the basis of the difference in frequency between light beams transmitted through the optical crystal.Type: GrantFiled: May 29, 2018Date of Patent: February 11, 2020Assignees: SEKISUI MEDICAL CO., LTD., NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITYInventors: Tetsuo Iguchi, Hideki Tomita, Norihiko Nishizawa, Toshinari Oh-Hara, Akira Ideno
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Publication number: 20200033256Abstract: A carbon isotope analysis device including a carbon dioxide isotope generator provided with a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer including an optical resonator having a pair of mirrors and a photodetector that determines intensity of light transmitted from the optical resonator; and a light generator including a light source, a splitter that splits light from the light source, a focusing lens that focuses light from the splitter, and a mirror that reflects light from the focusing lens and sends the light back to the light source via the focusing lens and the splitter. A carbon isotope analysis device improved in stability of a light source and a carbon isotope analysis method by use of the analysis device are provided.Type: ApplicationFiled: January 19, 2018Publication date: January 30, 2020Applicants: SEKISUI MEDICAL CO., LTD., NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITYInventors: Tetsuo IGUCHI, Hideki TOMITA, Norihiko NISHIZAWA, Volker SONNENSCHEIN, Ryohei TERABAYASHI, Toshinari OHARA, Akira IDENO, Atsushi SATOU, Kenta HASHIZUME
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Patent number: 10386231Abstract: A carbon isotope analyzer 1 includes a carbon dioxide isotope generator 40 that includes a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer 10 including an optical resonator 11 having a pair of mirrors 12, and a photodetector 15 that determines the intensity of light transmitted from the optical resonator 11; and a light generator 20 including a light source 23, a first optical fiber 21 to transmit a light beam from the light source 23, a second optical fiber 22 for wavelength conversion, the second optical fiber 22 splitting from the first optical fiber 21 at a point and combining with the first optical fiber 21 at another point downstream of the splitting point, and a non-linear optical crystal 25 that generates light having the absorption wavelength of the carbon dioxide isotope on the basis of the difference in frequency between light beams transmitted through the optical crystal 25.Type: GrantFiled: March 2, 2016Date of Patent: August 20, 2019Assignees: NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY, SEKISUI MEDICAL CO., LTD.Inventors: Tetsuo Iguchi, Hideki Tomita, Norihiko Nishizawa, Takahiro Hirotsu, Satoshi Yuruzume, Ryohei Terabayashi, Toshinari Oh-Hara, Akira Ideno, Atsushi Sato
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Publication number: 20180275050Abstract: A method and apparatus for analyzing carbon isotope 14C is provided. A carbon isotope analyzer including an isotopic carbon dioxide generator to generate isotopic carbon dioxide from a carbon isotope; a spectrometer including an optical resonator having a pair of mirrors, and a photodetector to determine the intensity of light transmitted from the optical resonator; and a light generator including a light source, a first optical fiber to transmit a light beam from the light source, a second optical fiber for wavelength conversion, the second optical fiber branching from the first optical fiber at a point and combining with the first optical fiber at another point downstream of the branching point, and a non-linear optical crystal to generate light having the absorption wavelength of the isotopic carbon dioxide on the basis of the difference in frequency between light beams transmitted through the optical crystal.Type: ApplicationFiled: May 29, 2018Publication date: September 27, 2018Applicants: SEKISUI MEDICAL CO., LTD., National University Corporation Nagoya UniversityInventors: Tetsuo IGUCHI, Hideki TOMITA, Norihiko NISHIZAWA, Toshinari OH-HARA, Akira IDENO
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Patent number: 10012586Abstract: A method and apparatus for analyzing carbon isotope 14C is provided. A carbon isotope analyzer including an isotopic carbon dioxide generator to generate isotopic carbon dioxide from a carbon isotope; a spectrometer including an optical resonator having a pair of mirrors, and a photodetector to determine the intensity of light transmitted from the optical resonator; and a light generator including a light source, a first optical fiber to transmit a light beam from the light source, a second optical fiber for wavelength conversion, the second optical fiber branching from the first optical fiber at a point and combining with the first optical fiber at another point downstream of the branching point, and a non-linear optical crystal to generate light having the absorption wavelength of the isotopic carbon dioxide on the basis of the difference in frequency between light beams transmitted through the optical crystal.Type: GrantFiled: August 11, 2016Date of Patent: July 3, 2018Assignees: SEKISUI MEDICAL CO., LTD., NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITYInventors: Tetsuo Iguchi, Hideki Tomita, Norihiko Nishizawa, Toshinari Oh-Hara, Akira Ideno
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Publication number: 20180052047Abstract: A carbon isotope analyzer 1 includes a carbon dioxide isotope generator 40 that includes a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer 10 including an optical resonator 11 having a pair of mirrors 12, and a photodetector 15 that determines the intensity of light transmitted from the optical resonator 11; and a light generator 20 including a light source 23, a first optical fiber 21 to transmit a light beam from the light source 23, a second optical fiber 22 for wavelength conversion, the second optical fiber 22 splitting from the first optical fiber 21 at a point and combining with the first optical fiber 21 at another point downstream of the splitting point, and a non-linear optical crystal 25 that generates light having the absorption wavelength of the carbon dioxide isotope on the basis of the difference in frequency between light beams transmitted through the optical crystal 25.Type: ApplicationFiled: March 2, 2016Publication date: February 22, 2018Applicants: NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY, SEKISUI MEDICAL CO., LTD.Inventors: Tetsuo IGUCHI, Hideki TOMITA, Norihiko NISHIZAWA, Takahiro HIROTSU, Satoshi YURUZUME, Ryohei TERABAYASHI, Toshinari OH-HARA, Akira IDENO, Atsushi SATO
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Publication number: 20160349177Abstract: Provided are a simple and convenient apparatus capable of analyzing carbon isotope 14C and a method of analyzing the carbon isotope.Type: ApplicationFiled: August 11, 2016Publication date: December 1, 2016Applicants: SEKISUI MEDICAL CO., LTD., National University Corporation Nagoya UniversityInventors: Tetsuo IGUCHI, Hideki TOMITA, Norihiko NISHIZAWA, Toshinari OH-HARA, Akira IDENO
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Patent number: 9182216Abstract: Provided are a method for observing protein crystal, wherein the growth process of the protein crystals is nondestructively and three-dimensionally monitored on a real-time basis and the growth of the crystals is controlled at a high accuracy to thereby enable the formation of single crystals having good qualities, which comprises observing the protein crystals, said protein crystals having been produced by a crystallization method using a gel, by an OCT measurement using light emitted from an ultrawideband light source; a method for observing protein crystals wherein the ultrawideband light source is an ultrawideband supercontinuum light source; a method for observing protein crystals wherein the center wavelength of the light emitted from the ultrawideband supercontinuum light source is a 0.8 ?m band; and a method for observing protein crystals wherein the monitoring of the protein crystals is a monitoring by an in situ measurement.Type: GrantFiled: September 20, 2011Date of Patent: November 10, 2015Assignee: OSAKA UNIVERSITYInventors: Norihiko Nishizawa, Hiroyoshi Matsumura, Yuusuke Mori, Shutaro Ishida, Kazuyoshi Itoh, Shigeru Sugiyama, Hiroaki Adachi, Tsuyoshi Inoue, Kazufumi Takano, Murakami Satoshi
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Patent number: 9109954Abstract: An optical microscope that can prevent an increase in the complexity of the light source system is equipped with optics readily capable of adequate operation even when the modulation frequency is increased to reduce the impact of the intensity noise of the laser. The optical microscope irradiates a sample with a first train of optical pulses having a first optical frequency, which is generated by a first light source, and a second train of optical pulses having a second optical frequency, which is temporally synchronized with the first train of optical pulses and is generated by a second light source, and detects light scattered from the sample. A first repetition frequency of the first train of optical pulses is an integral sub-multiple of a second repetition frequency of the second train of optical pulses.Type: GrantFiled: December 16, 2013Date of Patent: August 18, 2015Assignee: CANON KABUSHIKI KAISHAInventors: Yasuyuki Ozeki, Kazuyoshi Itoh, Fumihiro Dake, Kiichi Fukui, Shinichiro Kajiyama, Yuma Kitagawa, Norihiko Nishizawa, Kazuhiko Sumimura
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Patent number: 9075284Abstract: The present invention provides a method for narrowing a spectral width that can also be adapted to an ultrashort optical pulse emitted from a wavelength tunable light source, and that can provide an output optical pulse with a narrow spectral width and a low noise component, and an optical element and a light source device that use the method for narrowing a spectral width. The method includes using an optical waveguide member (2) to cause a soliton effect in an input optical pulse (1) within the optical waveguide member (2), thereby narrowing a spectral width of the input optical pulse (1) to provide an output optical pulse (3), the optical waveguide member (2) having dispersion characteristics such that the average of a second-order dispersion value (?2) with respect to the input optical pulse (1) is negative, and the absolute value of the second-order dispersion value (?2) increases in a propagation direction of the input optical pulse (1).Type: GrantFiled: April 26, 2011Date of Patent: July 7, 2015Assignee: OSAKA UNIVERSITYInventors: Norihiko Nishizawa, Yasuyuki Ozeki, Kazuyoshi Itoh
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Publication number: 20140104608Abstract: An optical microscope that can prevent an increase in the complexity of the light source system is equipped with optics readily capable of adequate operation even when the modulation frequency is increased to reduce the impact of the intensity noise of the laser. The optical microscope irradiates a sample with a first train of optical pulses having a first optical frequency, which is generated by a first light source, and a second train of optical pulses having a second optical frequency, which is temporally synchronized with the first train of optical pulses and is generated by a second light source, and detects light scattered from the sample. A first repetition frequency of the first train of optical pulses is an integral sub-multiple of a second repetition frequency of the second train of optical pulses.Type: ApplicationFiled: December 16, 2013Publication date: April 17, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Yasuyuki OZEKI, Kazuyoshi ITOH, Fumihiro DAKE, Kiichi FUKUI, Shinichiro KAJIYAMA, Yuma KITAGAWA, Norihiko NISHIZAWA, Kazuhiko SUMIMURA
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Patent number: 8629980Abstract: The invention provides an optical microscope that prevents an increase in the complexity of the light source system and is equipped with optics readily capable of adequate operation even when the modulation frequency is increased in order to reduce the impact of the intensity noise of the laser, etc. This optical microscope 100 irradiates a sample 6 with a first train of optical pulses having a first optical frequency, which is generated by a first light source, and a second train of optical pulses having a second optical frequency, which is temporally synchronized with the first train of optical pulses and is generated by a second light source, and detects light scattered from the sample 6. The repetition frequency of the train of optical pulses generated by the first light source is an integral sub-multiple of the repetition frequency of the train of optical pulses generated by the second light source.Type: GrantFiled: June 2, 2010Date of Patent: January 14, 2014Assignee: Canon Kabushiki KaishaInventors: Yasuyuki Ozeki, Kazuyoshi Itoh, Fumihiro Dake, Kiichi Fukui, Shinichiro Kajiyama, Yuma Kitagawa, Norihiko Nishizawa, Kazuhiko Sumimura
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Publication number: 20130184445Abstract: Provided are a method for observing protein crystal, wherein the growth process of the protein crystals is nondestructively and three-dimensionally monitored on a real-time basis and the growth of the crystals is controlled at a high accuracy to thereby enable the formation of single crystals having good qualities, which comprises observing the protein crystals, said protein crystals having been produced by a crystallization method using a gel, by an OCT measurement using light emitted from an ultrawideband light source; a method for observing protein crystals wherein the ultrawideband light source is an ultrawideband supercontinuum light source; a method for observing protein crystals wherein the center wavelength of the light emitted from the ultrawideband supercontinuum light source is a 0.8 ?m band; and a method for observing protein crystals wherein the monitoring of the protein crystals is a monitoring by an in situ measurement.Type: ApplicationFiled: September 20, 2011Publication date: July 18, 2013Applicant: OSAKA UNIVERSITYInventors: Norihiko Nishizawa, Hiroyoshi Matsumura, Yuusuke Mori, Shutaro Ishida, Kazuyoshi Itoh, Shigeru Sugiyama, Hiroaki Adachi, Tsuyoshi Inoue, Kazufumi Takano, Murakami Satoshi
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Publication number: 20130088770Abstract: The present invention provides a method for narrowing a spectral width that can also be adapted to an ultrashort optical pulse emitted from a wavelength tunable light source, and that can provide an output optical pulse with a narrow spectral width and a low noise component, and an optical element and a light source device that use the method for narrowing a spectral width. The method includes using an optical waveguide member (2) to cause a soliton effect in an input optical pulse (1) within the optical waveguide member (2), thereby narrowing a spectral width of the input optical pulse (1) to provide an output optical pulse (3), the optical waveguide member (2) having dispersion characteristics such that the average of a second-order dispersion value (?2) with respect to the input optical pulse (1) is negative, and the absolute value of the second-order dispersion value (?2) increases in a propagation direction of the input optical pulse (1).Type: ApplicationFiled: April 26, 2011Publication date: April 11, 2013Applicant: OSAKA UNIVERSITYInventors: Norihiko Nishizawa, Yasuyuki Ozeki, Kazuyoshi Itoh
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Patent number: 8351039Abstract: A spectroscopy method, includes guiding pulse laser light to an optical fiber, which mutually reacts with a sample to be measured of a light absorptance characteristic, outputting ring down pulse light obtained through light absorption of the sample, measuring an absorptance characteristic of the sample based on an attenuation characteristic of the ring down pulse light, and setting the pulse laser light as wide-spectrum laser light, setting the optical fiber as a strong dispersive optical fiber, and increasing a pulse width of the ring down pulse light to measure a wavelength absorptance characteristic based on a ring down attenuation constant of a pulse train with respect to a time sequence corresponding to a wavelength.Type: GrantFiled: October 21, 2010Date of Patent: January 8, 2013Assignee: Nu Eco Engineering Co., Ltd.Inventors: Masafumi Ito, Norihiko Nishizawa, Masaru Hori, Toshio Goto, Hiroyuki Kano