APPARATUS AND METHOD FOR EVALUATING INTERNAL VACUUM LEVEL OF VACUUM INSULATION PANEL USING FREQUENCY RESPONSE METHOD

摘要

PURPOSE: An apparatus and a method for evaluating internal vacuum level of vacuum insulation panel using frequency response member are provided to measure a natural frequency after adding impact to the surface of the vacuous insulators. CONSTITUTION: An apparatus for evaluating internal vacuum level of vacuum insulation panel using frequency response member comprises a hammer portion(110), a displacement measurement part(120), a frequency estimator(130) and a vacuum degree evaluation part(140). The hammer portion adds impact in order to exhaust a vacuous insulator(101). The displacement measurement part measures the displacement of the particle according to the impact added in the vacuous insulator. The frequency estimator measures the natural frequency of the vacuous insulator by using the displacement measurement value.