Abstract: An embodiment optical body is provided in a propagation path of light between a Si waveguide and an optical fiber. The optical body changes a course of some of radiation mode light, which is emitted from the Si waveguide and propagates in a direction away from an optical axis thereof, to obtain waveguide mode light passing through itself. Thus, the amount of waveguide mode light incident on the optical fiber increases, and the coupling efficiency between the Si waveguide and the optical fiber is improved.

Abstract: An optical connection structure includes a first focus lens arranged between a first light incidence/emission end and an optical element, and a second focus lens arranged between a second light incidence/emission end and the optical element. The first focus lens and the second focus lens are arranged on an optical axis connecting the first light incidence/emission end and the second light incidence/emission end.

Abstract: A propeller guard 2 includes: a propeller guard body 10 configured to surround a propeller 30 of a flight vehicle 20; and a rotating member 40 provided on a side surface of the propeller guard body 10, in which the rotating member 40 is able to rotate around at least a horizontal base axis in a case where the rotating member 40 is in contact with a vertical plane located outside the propeller guard body 10.

Abstract: A vibration reproduction device (100) is a vibration reproduction device that reproduces vibration of a pipeline (10) attached to a structure, and includes: a plurality of support members (101a, 101b) for supporting the pipeline; a fixing members (102a, 102b) for fastening the pipeline to the support members; support bases (103a, 103b) that are joined to the support members and to which a vibration force is applied; and viscoelastic members (106a, 106b) provided between the support bases and the ground.

Abstract: A vibration test device (100) is a vibration test device for testing vibration of a pipeline (10) attached to a structure. The vibration test device includes a plurality of support members (101a, 101b) that are joined to a wall surface with a predetermined gap therebetween and support the pipeline, a first fixing member (102a) that fastens the pipeline to a first support member at a position where one end of the pipeline protrudes from the first support member, a second fixing member (102b) that fastens the pipeline to a second support member at a position where another end of the pipeline protrudes from the second support member, a vibration-applying portion (103) that applies vibration force to one of the support members, a detection unit (104) that detects vibration of the pipeline, and a measurement unit (105) that measures a vibration characteristic of the pipeline.

Abstract: A U-bolt (10) according to the present disclosure is a U-bolt (10) including a pair of shaft parts (11) arranged in a first direction and extending in a second direction orthogonal to the first direction, and a bridge part (12) connecting one end of each of the pair of shaft parts (11) and in which a strain detection pattern is attached to at least a part of at least one shaft part (11) of the pair of shaft parts (11).

Abstract: A U-bolt (10) according to the present disclosure includes a pair of shaft parts (11) aligned in a first direction and extending in a second direction orthogonal to the first direction; a bridge part (12) which connects one ends of each of the pair of shaft parts (11); and a first pair of strain gauges (14) which are stuck to at least one shaft part (11) of the pair of shaft parts (11) to face each other with the shaft part (11) sandwiched in the first direction, and which output a signal corresponding to bending of the shaft part (11) in the second direction.

Abstract: An installing system (100) according to the present disclosure includes a U-bolt (10) which includes a pair of shaft parts (11) aligned in a first direction and extending in a second direction orthogonal to the first direction, and a bridge part (12) that connects one ends of each of the pair of shaft parts (11); and a measurer (20), in which a strain gauge (14) which outputs a signal corresponding to a strain of the shaft parts (11) in the second direction is embedded in each of the pair of shaft parts (11), in line symmetry with respect to a straight line (OX) including an apex (0) of the U-shape and extending in the second direction, and the measurer (20) measures the strain of each of the pair of shaft parts (11) in the second direction, from an output signal of the strain gauge (14) embedded in each of the pair of shaft parts (11).

Abstract: A U-bolt (10) according to the present disclosure is a U-bolt (10) including a pair of shaft parts (11) arranged in a first direction and extending in a second direction orthogonal to the first direction, a bridge part (12) connecting one end of each of the pair of shaft parts (11) and includes a photonic crystal thin film (14) which is stuck to at least a part of at least one shaft part (11) of the pair of shaft parts (11) and changes its color according to strain of the shaft part (11).

Abstract: An optical connection structure 1 includes a waveguide substrate; a Si waveguide formed on one surface of the waveguide substrate and having a first end surface; an optical fiber having a second end surface facing the first end surface; a terrace section extending further toward the optical fiber side from an end portion on the optical fiber side of the waveguide substrate; and a lens disposed on the terrace section, and arranged on an optical axis connecting the first end surface and the second end surface.

Abstract: A photoelectric fiber includes a fiber including a core through which light is guided; an electrical unit formed continuously with the fiber, the electrical unit being configured to house a photoelectric conversion chip including a photoelectric conversion element; and an external electrode formed on a front surface of at least one of the fiber or the electrical unit, wherein the photoelectric conversion chip is optically connected to the core and electrically connected to the external electrode.

Abstract: Provided is a crewless aircraft capable of accurately estimating its own position even inside a manhole, as well as a crewless aircraft control method. A crewless aircraft according to the present invention is a crewless aircraft used to inspect an interior of a manhole, and includes: a camera sensor that captures an image of a manhole opening; a plurality of rangefinders that measure a distance to a ground surface or a predetermined surface in the interior; and a control unit that estimates an own position on the basis of recognition information of the manhole opening obtained by performing recognition on image information obtained from the camera sensor, and distance information of the distance to the ground surface or the predetermined surface obtained from the rangefinders.

Abstract: A U-bolt (10) according to the present disclosure is a U-bolt (10) fastened to a fastened object (2), the U-bolt including: a body part (11) which include a pair of shaft parts (111) aligned in a first direction and extending in a second direction orthogonal to the first direction, and a bridge part (112) which connects one ends of each of the pair of shaft parts (111), includes a U-shaped apex formed by the U-bolt (10), and is configured to be linearly symmetric with respect to an imaginary straight line (OX) extending in the second direction; and a pair of screw parts (12) provided at the other ends of each of the pair of shaft parts (111), in which a length mark indicating an index related to a length of the body part (11) along a direction in which the body part (11) extends from the apex is attached to each of the pair of shaft parts (111).

Abstract: A storage device (10) that stores an unmanned aerial vehicle (30) includes a gripping portion (11) for gripping the unmanned aerial vehicle (30), and a main body portion (10) having a suction surface (21) to which an upper surface (313) of the unmanned aerial vehicle (30) is suctioned.

Abstract: A storage device (20) according to the present disclosure is a storage device that stores an unmanned aerial vehicle (30), and includes a main body portion (21) having a curved surface on which the unmanned aerial vehicle (30) is movable by bringing its wheels (302) into contact therewith, and a gripping portion (23) for gripping the unmanned aerial vehicle (30).

Abstract: A storage device (10) that can be installed in place of a lid of a manhole (100) includes a storage portion (11) that stores an unmanned aerial vehicle (30) and a partition plate (12) that partitions the storage portion (11) and the manhole (100), and the partition plate (12) can slide or be opened and closed.

Abstract: A propeller guard 10 includes a frame 16 provided along a rotating surface of a propeller 30 and surrounding a rotating end 30b of the propeller 30, in which the frame 16 includes a plurality of protrusions 16b protruding outward in plan view.

Abstract: A propeller guard 2 includes: a propeller guard body 10 configured to surround a propeller 30 of a flight vehicle 20; and a repulsive member 40 provided to protrude on the propeller guard body 10 and including a first end and a second end to exert repulsive force outward from the propeller guard body 10, in which the first end 41 of the repulsive member is located outside an outer edge of the propeller guard body 10 as viewed from vertically above.

Abstract: A propeller guard 2 includes: a propeller guard body 10 configured to surround a propeller 30 of a flight vehicle 20; and a rod-shaped body 40 provided on an upper portion of the propeller guard body 10 and including a first end 44 and a second end 41, in which the first end 44 of the rod-shaped body 40 is provided near a peripheral portion of an upper surface of the propeller guard body 10, and the rod-shaped body 40 extends while passing above the upper surface of the propeller guard body 10 as viewed from vertically above.

Abstract: A propeller guard 10 includes an upper frame 12 provided on the uppermost surface of the propeller guard 10, a base frame 15 provided on the lowermost surface of the propeller guard, and a curved frame 18 that couples the upper frame 12 and the base frame 15 together and is curved outward.