The invention relates to a method for optical measuring systems,
comprising a sensor element (6) connected to a measuring and control unit
(10) via an optical connection (3), and being adapted for providing a
signal defining a measurement of a physical parameter (p) influencing the
sensor element (6), said method comprising generation of a measuring
signal that is brought to come in towards the sensor element (6), and
detection of the intensity of the measuring signal (B) in the measuring
and control unit (10), after influencing the measuring signal in the
sensor element (6). The invention is characterised by comprising partial
reflection of the measuring signal at a point along the optical
connection (3), at a predetermined distance from the sensor element (6),
detection of the intensity of the signal (A), corresponding to said
partially reflected measuring signal, and determination of a measurement
of said parameter (p) based upon the intensity of the partially reflected
signal (A) and the intensity of the measuring signal (B). The invention
also relates to a device for carrying out said method. Through the
invention, measurements with an optical pressure measuring system are
allowed, which exhibit effective compensation for any existing sources of
error.