Abstract: A method and an apparatus for the locally resolved pressure measurement along a pressure region (15), wherein it is proposed according to the invention that by using a glass optical fibre (11) comprising an optical fibre core (11?), an optical fibre cladding (11?), and an outer protective coating (16) and extending inside a tubular enclosure (6) in the longitudinal direction of the enclosure (6), a pressure acting isotropically on a length section of the tubular enclosure (6) arranged along the pressure region (15) is transformed into an asymmetric pressure load on the region of the optical fibre cladding (11?) situated within the length section, wherein the double refraction caused by the asymmetric pressure load in this length section is detected by using a reflection measurement along the optical fibre (11), and the pressure acting on the length section is determined from the asymmetric pressure load determined in this manner.