Patent ID: 8141436

Claim:
A flow meter to be used in a hole drilled in bedrock in order to measure stream flows in bedrock fractures which are transversal to the hole, the hole having a diameter, the flow meter comprising an elongated body having a cross-section which is substantially smaller than the diameter of the hole; separating members placed at a distance from each other in a longitudinal direction of the hole for separating an examined section from other parts of the hole in a substantially pressure-tight manner; dividing members for dividing the examined section into two sectors in the longitudinal direction of the hole; and a flow channel extending through elongated body and equipped with a flow sensor for measuring a direction and rate of flow between the sectors, wherein the dividing members are formed of thin and elastic sealing strips which have been fixed to the body and, being substantially perpendicular to a surface of the elongated body, arranged to surround and delimit the sectors.