Measuring method for detecting a mechanical force acting on an object using a fiber optic sensor unit

A measuring method for detecting a mechanical force acting on an object by a fiber optic sensor unit, wherein at least one measuring channel is present which comprises a sensor fiber with at least one sensor fiber Bragg grating with a Bragg wavelength, the fiber Bragg grating being embedded in the sensor fiber, and a sensor detection element, wherein the sensor fiber is attached to the object in the area of the sensor FBG, wherein the method comprises:

• coupling light from a light source into the sensor fiber:
• detecting the light reflected and/or transmitted by the sensor FBG by means of the sensor detection element;
• wherein the light source has a wavelength-dependent intensity distribution with an edge;
• wherein the light reflected and/or transmitted by the sensor FBG is detected by means of the sensor detection element over the entire wavelength range of the light reflected and/or transmitted by the sensor FBG;
• and
• wherein a wavelength change in the Bragg wavelength of the sensor FBG is determined by evaluating a measurement signal which comprises an intensity change in the light intensity detected by the sensor detection element.