Patent ID: 8327556
Filing Date: 2012-12-11
Classification: G01B

Abstract:
1. A hydraulic micrometer system adapted for remote measurement of inside diameter of long straight/curved pipes and tubes, comprising: a hydraulically operable master cylinder having a cooperative master piston installed in a control unit; a slave cylinder having three radially displaceable radial legs for diameter measurement with a cooperative slave piston installed in the micrometer head adapted to traverse inside for said dimension measurement and flexibly hydraulically coupled to said master cylinder such that displacement of the piston of the slave cylinder is indirectly controlled by the actuation of the piston of the master cylinder in said control unit, said slave piston rod being conical shaped such that said displacement of the slave piston in relation to said main piston causes said three radial legs to extend outwards and finally touch the internal contact point for internal dimension measurement; and means for continuous measurement of the rate of rise of pressure of system fluid and measure the internal dimension at contact point detected by sudden rise in pressure rise rate of system fluid on touching of said radial leg at said internal contact point.