Patent ID: 6384404
Filing Date: 2002-05-07
Classification: G01B,G01D,G01L

Abstract:
Device for measuring bending loads in constructions, characterized in that the device includes a housing (150) provided with:a first sensor for measuring a bending load, said sensor including a housing (101) connected to an optical fibre (120) mounted/prestressed in a first anchoraging point (110) and a second anchoraging point (111) by the housing, wherein the fibre (120) is provided with a first Bragg grating (121), located in the prestressed fibre, and housing (101) being arranged so that the fibre (120), when exposed to a strong bending force on the housing, is not brought in contact therewith and is exposed to tension load, a second sensor for measuring tension load, said sensor including a housing (103) connected to an optical fibre (120) prestressed in a first anchoraging point (111) and a second anchoraging point (112) by the housing, wherein the fibre (120) is provided with a second Bragg grating (122), located in the mounted/prestressed fibre, the housing (105) being arranged with an element (103, 104) forcing the fibre to be bent along with the housing (103), a third sensor for measuring temperature, said sensor including a housing (105) attached to an optical fibre (120) suspended in a first anchoring point (112) and a second anchoring point (113) by the housing without prestressing the fibre, wherein the fibre (120) includes a third Bragg-grating (123) located in the suspended fibre, the housing (105) being arranged so that the fibre (120), by a strong bending or tension of the housing, is not brought into contact therewith and is exposed to tension load, wherein one or more of the respective sensors are arranged sequentially in the housing (150) along the common optical fibre (120).