Long line hydrophone

A long line hydrophone comprising a long hollow compliant tube, the tube being tightly wound with multiple bifilar ribbons, with combined means to supply constant current to each bifilar ribbon at high frequency, each bifilar ribbon consisting of a magnetorestrictive material and where the compliant tube is filled with a suitable liquid and where the liquid moves to change the shape of the tube and to change the length and magnetoresistive properties of the bifilar ribbons in response to stress on the tube that produces a change in voltage and where the bifilar ribbons are connected to a low voltage DC bias, a constant current, high frequency source and means to measure the change in voltage.