Pinhole detector

摘要

A pinhole detector for accurately and speedily detecting pinholes in a sealed container. The detector comprises a pallet (1) which removably holds gas-filled containers (11) and which has an air inlet (13) closable to keep the pallet sealed; a gas leak detector (2) connected to the air inlet (13) in an examination position, communicating with the interior of the pallet (1) and adapted to generate an analog voltage corresponding to leakage per unit time if the same gas in the container is present; an A/D converter (3) adapted to convert this analog signal into a digital signal; and a first arithmetic unit (4) adapted to determine on the basis of this signal the gradient of a linear regression line representative of the relation between voltage and time, calculate a difference between this gradient and a maximum value of the gradient which has been inputted in advance of a linear regression line in the air the above-mentioned gas and output an abnormality signal when this difference is out of a permissible range.