Industrial roll with optical roll cover sensor system

A roll cover, comprising:

• at least one fiber optical sensor at least one of embedded in the roll cover and configured for being located between the roll cover and a roll core of an industrial roll, said at least one fiber optical sensor being formed by a transverse force transducing fiber Bragg sensor which includes a fiber optical waveguide and a stud element, said fiber optical waveguide including a fiber core, a fiber cladding, a Bragg grating located in said fiber core, a first section which houses said Bragg grating, a longitudinal direction, and a circumferential surface including a partial area, said Bragg grating including a grating spacing, said stud element including a first component and being nonpositively joined to said partial area of said circumferential surface of said fiber optical waveguide, a dimension of said partial area in said longitudinal direction of said fiber optical waveguide being longer than said grating spacing of said Bragg grating, said partial area being located at said section of said fiber optical waveguide which houses said Bragg grating, at least said first component of said stud element being formed from a first material having a Young's modulus of less than 10 kN/mm2.

A fiber optical sensor, comprising:

• a transverse force transducing fiber Bragg sensor including a fiber optical waveguide and a stud element, said fiber optical waveguide including a fiber core, a fiber cladding, a Bragg grating located in said fiber core, a first section which houses said Bragg grating, a longitudinal direction, and a circumferential surface including a partial area, said Bragg grating including a grating spacing, said stud element including a first component and being nonpositively joined to said partial area of said circumferential surface of said fiber optical waveguide, a dimension of said partial area in said longitudinal direction of said fiber optical waveguide being longer than said grating spacing of said Bragg grating, said partial area being located at said section of said fiber optical waveguide which houses said Bragg grating, at least said first component of said stud element being formed from a first material having a Young's modulus of less than 10 kN/mm2, the fiber optical sensor configured for being at least one of (a) embedded in a roll cover of an industrial roll, and (b) located between said roll cover and a roll core of the industrial roll wherein said roll core has a cylindrical section with a substantially cylindrical geometry and said roll cover sheathes said cylindrical section of said roll core at least partly.