Leak test condition design method, leak test condition design device, leak testing method, and leak testing device

A leak test condition design device comprising:

• a computing part configured to obtain a volume of an sealed internal space of a test piece to be inspected, and to obtain a remaining volume of an internal space of a sealed container for the test piece when the test piece is loaded for a differential pressure based air leak test;
• a first test condition setting part configured to determine a test air pressure to be applied into the sealed container for the test piece with the test piece loaded and a sealed container for a master with a master loaded in the differential pressure based air leak test;
• a second test condition setting part configured to determine conditions of a bombing process for filling a filling chamber with the test piece loaded with helium gas in a helium leak test;
• a first simulation processing part configured to simulate the differential pressure based air leak test under the obtained volume of the sealed internal space of the test piece, the obtained remaining volume of the internal space of the sealed container for the test piece, and the determined test air pressure to obtain a differential pressure value between the test piece and the master, and also configured to convert the obtained differential pressure value into an equivalent standard leak rate to derive a differential pressure conversion value;
• a second simulation processing part configured to simulate the helium leak test under the determined conditions of the bombing process to obtain a helium leak rate of the test piece, and also configured to convert the obtained helium leak rate into an equivalent standard leak rate to derive a helium leak rate conversion value;
• and
• a display unit configured to display the differential pressure conversion value obtained from the first simulation processing part and the helium leak rate conversion value obtained from the second simulation processing part, on a same graph with the equivalent standard leak rate as a horizontal axis or a vertical axis.