Patent ID: 6597821
Filing Date: 2003-07-22
Classification: G01F,G01L

Abstract:
A fiber laser differential pressure sensor, &Dgr;p=p1âˆ’p2, between two pressures, p1 and p2, particularly suitable for pressure measurement in oil boreholes, comprising a pumping light source, feed fibers, a fiber laser, which has a laser-amplifying fiber and at least two end reflectors, a detection unit and an electronic evaluation unit, whereina) at least two sensor fiber segments with a structure that is not rotationally symmetrical are arranged between the end reflectors, and b) the sensor fiber segments have an opposite pressure sensitivity of the birefringence, c) a first pressure p1 acting on a first sensor fiber segment, and a second pressure p2 acting on a second sensor fiber segment, and d) the detection unit and electronic evaluation unit comprise means for determining a birefringence-induced beat frequency.