An optical fiber transducer usable in environments of extreme operating temperature features a stationary support, a movable body displaceable back and forth relative thereto, and an optical fiber connected between the support and the movable body. The fiber has a Fiber Bragg Grating in an intermediate region thereof between the support and movable body. To accommodate varying coefficients of thermal expansion (CTEs) among these components, one or more tubes close circumferentially around the fiber. Each tube has a CTE that is greater than that of the fiber, and less than that of the constituent material of the support and movable body. The fiber is bonded to an interior of the tube(s), while an exterior of the tube(s) is bonded to the support and movable body.
G01D 5/32 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light
G01P 15/03 - Measuring accelerationMeasuring decelerationMeasuring shock, i.e. sudden change of acceleration by making use of inertia forces by using non-electrical means
G02B 6/00 - Light guidesStructural details of arrangements comprising light guides and other optical elements, e.g. couplings
G02B 6/34 - Optical coupling means utilising prism or grating
G02B 7/00 - Mountings, adjusting means, or light-tight connections, for optical elements
2.
HIGH-TEMPERATURE OPTICAL FIBER TRANSDUCER AND METHOD OF PRODUCING SAME
An optical fiber transducer usable in environments of extreme operating temperature features a stationary support, a movable body displaceable back and forth relative thereto, and an optical fiber connected between the support and the movable body. The fiber has a Fiber Bragg Grating in an intermediate region thereof between the support and movable body. To accommodate varying coefficients of thermal expansion (CTEs) among these components, one or more tubes close circumferentially around the fiber. Each tube has a CTE that is greater than that of the fiber, and less than that of the constituent material of the support and movable body. The fiber is bonded to an interior of the tube(s), while an exterior of the tube(s) is bonded to the support and movable body.
G01D 5/32 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using optical means, i.e. using infrared, visible or ultraviolet light with attenuation or whole or partial obturation of beams of light
G01P 15/03 - Measuring accelerationMeasuring decelerationMeasuring shock, i.e. sudden change of acceleration by making use of inertia forces by using non-electrical means
G02B 6/00 - Light guidesStructural details of arrangements comprising light guides and other optical elements, e.g. couplings
G02B 6/34 - Optical coupling means utilising prism or grating
G02B 7/00 - Mountings, adjusting means, or light-tight connections, for optical elements
The optical sensor generally has a frame having a deformable member mounted to the frame, and a sensing optical fiber being fixedly attached to a portion of the deformable member, the sensing optical fiber having at least one π-phase-shifted fiber Bragg grating inscribed thereon, the at least one π-phase-shifted fiber Bragg grating of the sensing optical fiber deforming together with the deformable member when the frame is subjected to a force.
G01L 1/24 - Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis
G01L 11/02 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group or by optical means
G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elementsTransmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
