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公开(公告)号：EP4283341A1
公开(公告)日：2023-11-29
申请号：EP21927860.3
申请日：2021-02-26
发明人： IMAKI, Masaharu , NAKANO, Takayuki , ITO, Yusuke
IPC分类号： G01S17/95
摘要： A lidar device (1) that radiates a first laser beam having a wavelength included in an absorption wavelength band of an observation target gas and a second laser beam having a lower absorption rate by the gas than that of the first laser beam to a space where the gas is present is configured. The lidar device (1) includes: a light source (11) to output a laser beam; a frequency output unit (12) to output a first frequency or a second frequency different from the first frequency; a reference light output unit (13) to output the laser beam output from the light source (11) as reference light; an optical transmission unit (14) to generate the first laser beam by modulating an optical frequency of the laser beam output from the light source (11) by the first frequency, generate the second laser beam by modulating the optical frequency of the laser beam output from the light source (11) by the second frequency, and radiate each of the first laser beam and the second laser beam to the space; and an optical receiving unit (15) to receive, as scattered light, the first laser beam radiated by the optical transmission unit (14) and then scattered by a scatterer floating in the space or the second laser beam radiated by the optical transmission unit (14) and then scattered by the scatterer, and detect interference light between the scattered light and the reference light.
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公开(公告)号：EP1860478B1
公开(公告)日：2018-04-25
申请号：EP06715405.4
申请日：2006-03-08
IPC分类号： G02B17/00
CPC分类号： G02B17/0626
摘要： Provided is a compact and bright imaging optical system having a high resolution. The imaging optical system includes three reflectors composed of a first reflector (1), a second reflector (2), and a third reflector (3) that are arranged in this order on an optical path of incident ray so as not to block the incident light. In the imaging optical system, in which light beams reflected by the three reflectors form an image plane (4), a convex mirror is used for any one of the first reflector (1) and the third reflector (3) and a concave mirror is used for the other thereof, and vertexes of a triangular dipyramid (6) are defined in terms of a central chief ray (5) by an appropriate point on the central chief ray (5) that is incident to the first reflection surface, a reflection point of each central chief ray on the first to third reflection surfaces, and an image forming point of the central chief ray. A plane containing three reflection points of the central chief ray on the first to third reflection surfaces coincides with a bonding plane between two triangular pyramids forming the triangular dipyramid (6).
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公开(公告)号：EP4328645A1
公开(公告)日：2024-02-28
申请号：EP21945119.2
申请日：2021-06-10
摘要： An infrared optical system includes: a spherical lens unit (4) having an image-forming function as a whole and including one or more spherical lenses that form an image of an incident light beam from a subject; an aperture diaphragm unit (3) that limits transmission of the incident light beam through the spherical lens unit; an aberration correcting plate unit (1; 17) that is disposed at a preceding stage of the spherical lens unit, has at least one aspherical surface, and gives an optical path length difference for compensating an aberration to be generated in the spherical lens unit to the incident light beam; and a lens barrel unit (7) holding the spherical lens unit, the aperture diaphragm unit, and the aberration correcting plate unit.
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