Displacement extensometer

A displacement extensometer measuring a linear displacement of a measurement object, the displacement extensometer comprising:

• a first bracket installed at a reference point to provide a supporting force;
• a second bracket fixed to the measurement object;
• a displacement meter body fixed to the first bracket, including a center rod connected to the second bracket, and detecting a displacement as the center rod is horizontally moved according to a position of the measurement object;
• a first link connecting the displacement meter body with the first bracket;
• a second link connecting the center rod of the displacement meter body with the second bracket;
• and
• a friction compensation member provided in the displacement meter body and providing physical stress to the center rod to cancel a frictional force due to sagging of the center rod, wherein the friction compensation member includes at least one vibration motor built in the displacement meter body, connected to the center rod, and vibrating the center rod in a preset period.