Patent ID: 8205484
Filing Date: 2012-06-26
Classification: G01M

Abstract:
1. A leak testing apparatus for testing a workpiece having an inner space including an opening open to an outer surface, the leak testing apparatus comprising: a heat sensitive member including a body made of a material having high thermal conductivity, the body having an outer side surface abutted against the outer surface of the workpiece to close the opening, a pressure chamber formed inside the body, the pressure chamber arranged along the outer side surface and arranged over an area wider than the opening; a first introduction passage that introduces pressurized gas to the inner space; a first pressure sensor that detects an inner pressure of the inner space (hereinafter referred to as a first inner pressure information); a second introduction passage that introduces the pressurized gas to the pressure chamber; a second pressure sensor that detects an inner pressure of the pressure chamber (hereinafter referred to as a second inner pressure information); a compensator that compensates the first inner pressure information based on the second inner pressure information by subtracting a component attributable to temperature change in the inner space from the first inner pressure information; and a judger that judges whether or not there is a leak from the inner space based on the compensated first inner pressure information.