Patent ID: 9354086
Filing Date: 2016-05-31
CPC Classification: G01D

Claim Text:
1. A fiber optic measuring apparatus comprising a beam source, at least one optical fiber and a number of sensors which are integrated in or provided on the optical fiber cable and detect a mechanical load, a temperature and/or corrosive gases, characterised in that: the sensors are supplied with light from the beam source, the sensors form a fiber optic network, at least two of the sensors are integrated in or provided on the same optical fiber, the optical fiber cable is integrated in a power cable, the beam source is configured for generating continuum radiation and short-pulse emission at a defined laser wavelength, wherein a filter suppresses the continuum radiation in a defined spectral range around the defined laser wavelength, the output of the beam source is a broad-band emission having a gap at the defined spectral range around the defined laser wavelength with a high-intensity laser line at the defined laser wavelength being superimposed in said gap of said broad-band emission, a time-resolved light back-scattering measurement for two differently scattered light components of the short-pulse emission at the defined laser wavelength of the beam source provides the possibility of a local temperature measurement and/or local detection of the mechanical loads of the power cable, the at least one optical fiber comprises periodic refractive index structures, and the mechanical loading of the cable or the fiber is deduced from a shift of the back-reflected frequency components of the continuum radiation from the beam source.