Internal pressure determining method and system for hermetically sealed containers using electromagnetic induction

摘要: An internal pressure inspecting method and system for determining the degree of unevenness surface an elastic cover each one or more hermetically sealed containers, being produced according to pressure. The distance from a fixed position exterior container said is determined by measuring change in inductance utilizing action electromagnetic induction, at plurality points i.e. center peripheral portions thereof. A value derived calculation difference between mean both measured values any point portion on diametric line which symmetrical relation therewith with as symmetry, cover. this value.