Abstract: A system for exchanging optical signals between two separate locations. Each location is provided with a transceiver that includes a transmitter and a receiver. Both the transmitter and the receiver are based on a transceiver unit, used as a transmitter unit in the transmitter and as a receiver unit in the receiver. The transceiver unit includes a multimode optical waveguide and imaging optics that collimates the light emerging from the waveguide in the transmitter implementation of the unit and that focuses incoming light onto the waveguide in the receiver implementation of the unit. The waveguide is terminated by a FC/APC to suppress reflections at the waveguide/air interface. In each transceiver, the units are mounted in clusters, with their optical axes all parallel. Transmitter units of a transmitter cluster are optically coupled via a splitter to a common input waveguide, possibly via one or more optical amplifiers.

Abstract: A system for exchanging optical signals between two separate locations. Each location is provided with a transceiver that includes a transmitter and a receiver. Both the transmitter and the receiver are based on a transceiver unit, used as a transmitter unit in the transmitter and as a receiver unit in the receiver. The transceiver unit includes a multimode optical waveguide and imaging optics that collimates the light emerging from the waveguide in the transmitter implementation of the unit and that focuses incoming light onto the waveguide in the receiver implementation of the unit. The waveguide is terminated by a FC/APC to suppress reflections at the waveguide/air interface. In each transceiver, the units are mounted in clusters, with their optical axes all parallel. Transmitter units of a transmitter cluster are optically coupled via a splitter to a common input waveguide, possibly via one or more optical amplifiers.

Abstract: A system for exchanging optical signals between two separate locations. Each location is provided with a transceiver that includes a transmitter and a receiver. Both the transmitter and the receiver are based on a transceiver unit, used as a transmitter unit in the transmitter and as a receiver unit in the receiver. The transceiver unit includes a multimode optical waveguide and imaging optics that collimates the light emerging from the waveguide in the transmitter implementation of the unit and that focuses incoming light onto the waveguide in the receiver implementation of the unit. The waveguide is terminated by a FC/APC to suppress reflections at the waveguide/air interface. In each transceiver, the units are mounted in clusters, with their optical axes all parallel. Transmitter units of a transmitter cluster are optically coupled via a splitter to a common input waveguide, possibly via one or more optical amplifiers.

Abstract: A system for exchanging optical signals between two separate locations. Each location is provided with a transceiver that includes a transmitter and a receiver. Both the transmitter and the receiver are based on a transceiver unit, used as a transmitter unit in the transmitter and as a receiver unit in the receiver. The transceiver unit includes a multimode optical waveguide and imaging optics that collimates the light emerging from the waveguide in the transmitter implementation of the unit and that focuses incoming light onto the waveguide in the receiver implementation of the unit. The waveguide is terminated by a FC/APC to suppress reflections at the waveguide/air interface. In each transceiver, the units are mounted in clusters, with their optical axes all parallel. Transmitter units of a transmitter cluster are optically coupled via a splitter to a common input waveguide, possibly via one or more optical amplifiers.

Abstract: A system for exchanging optical signals between two separate locations. Each location is provided with a transceiver that includes a transmitter and a receiver. Both the transmitter and the receiver are based on a transceiver unit, used as a transmitter unit in the transmitter and as a receiver unit in the receiver. The transceiver unit includes a multimode optical waveguide and imaging optics that collimates the light emerging from the waveguide in the transmitter implementation of the unit and that focuses incoming light onto the waveguide in the receiver implementation of the unit. The waveguide is terminated by a FC/APC to suppress reflections at the waveguide/air interface. In each transceiver, the units are mounted in clusters, with their optical axes all parallel. Transmitter units of a transmitter cluster are optically coupled via a splitter to a common input waveguide, possibly via one or more optical amplifiers.

Abstract: The invention provides a wireless communication system having an airlink transceiver including an airlink transmitter and an airlink receiver for respectively transmitting and receiving signals over the air; an optical communication network interface unit for transmitting optical signals to the airlink transmitter and for receiving optical signals from the airlink receiver; and a universal converter unit, coupled to the airlink transceiver and to the optical communication network interface unit, for supplying optical signals without protocol conversion to the optical communication network interface unit, and electrical signals to the airlink transceiver. The invention also provides a method for connecting a wireless communication system to a plurality of communication networks, each having a different fundamental type of basic networking technologies.

Abstract: A wireless communication system, having first and second communication units located, in operation, in spaced-apart relationship to each other, each unit including a transmitter and a receiver, the first unit including a transmitter for transmitting information to the receiver of the second unit, and a receiver for receiving information from the transmitter of the second unit, the first unit including a scanner for scanning the unit along at least one axis with respect to the second unit. The first unit further includes a control for terminating the scanning of the first unit when the receiver of the first unit is precisely aligned with the transmitter of the second unit.

Abstract: A method for detection of surface discontinuities by luminescence which consists in the successive treatment of the surfaces of materials subject to testing and inspection with the following compositions of a penetrant, cleaning fluid and a developer, whereupon they are inspected under an ultraviolet light at wavelength of 340-420 nm. Liquid constituents are in volume percent.______________________________________ a) penetrant ditolylmethane 45-55 lower aliphatic alcohol 35-45 surface-active substance of non-ionogenic type 8-12 1,8-naphthoylene-1',2'-benzimidazole 7-9 gr/l or a composition: high-molecular aromatic hydrocarbons with 15-20 boiling point of about 700.degree. C paraffin hydrocarbons with boiling point of 120-240.degree.

Abstract: An evaporative cooler for a blast furnace which is provided with a stave having a projection extending crosswise adjacent to the stave end face. The stave and the projection are provided with built-in pipes for a cooling agent to pass therethrough, with the pipe built into the projection being so arranged that its inlet and outlet end portions are interposed between the outlet end portions of the pipes incorporated in the stave. Such an arrangement of the pipes in the cooler provides for its extended service life.

Abstract: A control device for a dragline excavator, comprising hoist and drag rope length increment transducers and revolving platform swing angle transducers responding to the movement of a bucket from its breakout point on the face to the dumping point and from the dumping point to the point where the bucket is lowered onto the face, speed transducers for the bucket hoisting and dragging and revolving platform swinging mechanism, as well as a bucket transportation time calculator and speed setters for the bucket hoisting and dragging and platform swinging mechanisms, associated with said transducers. The device of the invention determines bucket travel times by measuring the hoist and drag rope length increments and the swing angle of the platform, in the presence of limitations on the speeds and accelerations, and then calculates and plots velocity diagrams for the bucket hoisting and dragging and platform swinging mechanisms.