Abstract:
A method of establishing a dielectric periodic index of refraction phase grating (16) upon the core (19) of an optical waveguide (15) by intense angled application of several tranverse beams (99) of ultraviolet light, enabling the establishment of a distributed, spatially resolving optical fiber strain gauge (13).
Abstract:
A fusible spacer (10) for use in the manufacture of a plasma panel rigidly maintains a preselected spacing between the panel sidewalls (12, 14). The fusible spacer (10) comprises a core (40) fabricated from a refractory glass, such as R-6 glass, and has a first transverse dimension sized in accordance with the desired spacing between the panel sidewalls (12, 14). A cladding (42) surrounds the core (40) along and is formed from a material which has a much lower softening point, i.e., 350`C to 500`C. In the manufacture of a plasma panel the fusible spacers (10) are positioned on one sidewall (12) at a number of separate locations. The second sidewall (14) is then positioned on the first sidewall (12) and the composite panel is raised to a temperature sufficiently high to cause a softening of the solder glass cladding (42) fusing the two sidewalls (12, 14) together at a number of locations. Accordingly, the separation between the two halves of the panel is set by the first dimension of the core member (40) while the solder glass cladding (42) rigidly attaches to both panel sidewalls (12, 14) bonding the composite structure together. The core member (40) can have a circular cross section or numerous other cross sections so long as the first transverse dimension defines the panel spacing and the second transverse dimension is not too large to interfere with the discharge sites between row and column electrodes (16, 18).
Abstract:
An optical strain measuring arrangement including an optical waveguide comprising first and second cores fixedly mounted with respect to a mechanical structure to be monitored, and a detection system for relating the contrast in light intensity emerging from said cores to a range of wavelengths to establish an indication of strain along the range of the optical waveguide.
Abstract:
An optical fiber having at least two cores positioned in a common cladding can be fabricated to be responsive to strain or hydrostatic pressure but not to temperature through the selection of materials, spacing and shape of the cores and cladding in the fiber. Accordingly, the cross-talk between adjacent cores in the optical waveguide can be optimized to respond to a change in hydrostatic pressure or in unidirectional strain along the length of the fiber. The strain or pressure change, can be determined by measuring the relative intensity of light emerging from the different cores of the fiber. A larger unambiguous range for strain or hydrostatic pressure changes can be provided by a multi-core optical fiber embodiment.
Abstract:
An optical fiber has a dielectric periodic index of refraction phase grating established in its core by intense angled application of several transverse beams of ultraviolet light, enabling the establishment of a distributed, spatially resolving optical fiber strain gauge.
Abstract:
An optical fiber having at least two cores positioned in a common cladding can be fabricated to be responsive to strain or hydrostatic pressure but not to temperature through the selection of materials, spacing and shape of the cores and cladding in the fiber. Accordingly, the cross-talk between adjacent cores in the optical waveguide can be optimized to respond to a change in hydrostatic pressure or in unidirectional strain along the length of the fiber. The strain or pressure change, can be determined by measuring the relative intensity of light emerging from the different cores of the fiber. A larger unambiguous range for strain or hydrostatic pressure changes can be provided by a multi-core optical fiber embodiment.