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公开(公告)号：US11808577B2
公开(公告)日：2023-11-07
申请号：US17780668
申请日：2020-09-24
发明人： Ryotaro Inoue , Mikio Kozuma , Atsushi Tanaka
CPC分类号： G01C19/721 , G01C19/58 , G01P3/36 , G01P15/14 , G02F1/11 , G02F2/02 , G02F1/093 , G02F2201/02
摘要： An atomic interferometer includes: an optical system including an optical modulating device that includes: an optical fiber for a first laser beam to propagate therein; and a frequency shifter connected to the optical fiber and configured to shift the frequency of the first laser beam, the optical system being configured to generate a moving standing light wave from counter-propagation of the first laser beam from the optical modulating device and a second laser beam; and an interference system for making an atomic beam interact with three or more moving standing light waves including the moving standing light wave.
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公开(公告)号：US11585657B2
公开(公告)日：2023-02-21
申请号：US17826702
申请日：2022-05-27
发明人： Mikio Kozuma , Ryotaro Inoue , Toshiyuki Hosoya , Atsushi Tanaka
摘要： A geoid calculation data is collected easily. A geoid calculation data collection device of the present invention comprises an inertial measurement data acquisition part, a comparison data acquisition part, and a recording part. In the inertial measurement data acquisition part, data related to velocity, position, and attitude angle is acquired as inertially-derived data based on an output of an inertial measurement part having a three-axis gyro and a three-axis accelerometer attached to a moving body. In the comparison data acquisition part, data related to velocity is acquired as comparison data from a source other than the inertial measurement part. In the recording part, inertially-derived data and comparison data are recorded in association with each other. In the inertial measurement part, a bias stability is acquired that allows error arising from plumb line deviation to be distinguished to a predetermined degree.
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公开(公告)号：US11378397B2
公开(公告)日：2022-07-05
申请号：US17057862
申请日：2019-06-04
发明人： Mikio Kozuma , Ryotaro Inoue , Toshiyuki Hosoya , Atsushi Tanaka
摘要： A change in geoid height is measured easily. A geoid measurement method of the present invention executes an inertial measurement data acquiring step, a comparison data acquiring step, a state variable estimating step, and a geoid calculating step. In the inertial measurement data acquiring step, data related to velocity, position, and attitude angle is acquired as inertially-derived data based on the output of an inertial measurement part having a three-axis gyro and a three-axis accelerometer attached to a moving body. In the comparison data acquiring step, data related to velocity is acquired as comparison data from a source other than the inertial measurement part. In the state variable estimating step, state variables including a plumb line deviation are estimated by using the inertially-derived data and the comparison data to apply a Kalman filter in which the plumb line deviation is included in the state variables.
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公开(公告)号：US11614318B2
公开(公告)日：2023-03-28
申请号：US17285641
申请日：2019-10-09
发明人： Mikio Kozuma , Ryotaro Inoue , Toshiyuki Hosoya , Atsushi Tanaka
IPC分类号： G01B9/02015 , G21K1/02 , G01C19/58 , G01C19/62
摘要： An atomic beam is irradiated with a first laser beam, a second laser beam, and a third laser beam. The first laser beam and the third laser beam each have a wavelength corresponding to a transition between a ground state and a first excited state. The second laser beam has a wavelength corresponding to a transition between the ground state and a second excited state. First, atoms each having a smaller velocity component than a predetermined velocity in a direction orthogonal to the traveling direction of the atomic beam are changed from the ground state to the first excited state by the first laser beam. Subsequently, a momentum is provided for individual atoms in the ground state by the second laser beam, which removes the atoms from the atomic beam. Finally, atoms in the first excited state are returned from the first excited state to the ground state by the third laser beam.
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公开(公告)号：US11466987B2
公开(公告)日：2022-10-11
申请号：US16753176
申请日：2018-07-25
申请人： TOKYO INSTITUTE OF TECHNOLOGY , OSAKA UNIVERSITY , JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED , MITSUBISHI HEAVY INDUSTRIES, LTD.
发明人： Mikio Kozuma , Ryotaro Inoue , Takashi Mukaiyama , Utako Tanaka , Seiichi Morimoto , Kazunori Yoshioka , Atsushi Tanaka , Yuichiro Kamino
IPC分类号： G01C19/58
摘要： The present invention reduces measurement time. A gyroscope of the present invention includes a planar ion trap part, a microwave irradiation part, a laser irradiation part and a measurement part. The planar ion trap part includes two rf electrodes and two DC electrode rows, and forms ion traps that trap one ion on a substrate, a normal direction of the surface of the planar ion trap part corresponds to a z direction. The rf electrodes are disposed in the x direction on the substrate at a predetermined interval. The DC electrode rows are disposed in the x direction on the substrate so as to sandwich the two rf electrodes. The DC electrode rows each include at least five DC electrodes in the x direction. The trapped ions are spaced so as not to interfere with each other. The microwave irradiation part irradiates the ions with π/2 microwave pulses.
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