Abstract: A method for producing a prestressed fiber-optic sensor of two superposed metal strips (2,3) sheathing an optical fiber (1) with the strips being secured to each other along their lateral sides to provide a sheath exerting a prestress on the optical fiber includes a first step of superposing the lateral sides of the strips and aligning the edges of the strips. The superposition of the sides is carried out so as to produce a desired prestress on the optical fiber after the sides have been secured together. In a further step, the strips are continuously welded to each other to unite the adjacent edges after superposition of their lateral sides. The welding is performed simultaneously along both sides of the strips and with the same input of energy. The invention also relates to apparatus for carrying out the method and a prestressed fiber-optic sensor produced thereby.

Abstract: Device protecting a coaxial cable against high-powered low-frequency spurious pulses. A lightweight, compact device comprising a microstrip T-junction (5) folded back in the shape of an E on a substrate (6) integral to a single ground plate (7), with the branches of the E between the center point A and the coaxial plugs (1, 2) forming a quarter wavelength, as does the center horizontal branch of the E between points A and B. According to one of the variants, two microstrips arranged in parallel and separated by a dielectric substrate establish a quarter-wave trap. Application to microstrip resonant circuits.