초록 ▼

Pressure variation detecting type leakage inspection equipment which applies a fixed fluid pressure to an article to be inspected and judges whether the article is non-defective or defective, depending upon whether a change in the fluid pressure or in the differential pressure between the article un

Pressure variation detecting type leakage inspection equipment which applies a fixed fluid pressure to an article to be inspected and judges whether the article is non-defective or defective, depending upon whether a change in the fluid pressure or in the differential pressure between the article under inspection and a comparison tank is within a prescribed value, data on pressure values or differential pressure values by respective measurement which are within a proper value range are stored in succession, the stored data are averaged to obtain a correction value, and data by each measurement is corrected by the correction value, thereby automatically correcting an error which varies owing to various factors. Thus a proper leakage inspection can be achieved.

대표청구항 ▼

Pressure variation detecting type leakage inspection equipment which, in each measurement cycle, applies a fixed fluid pressure to an article to be inspected and measures variations in pressure associated with said article, said equipment comprising: pressure detecting means for detecting a change i

Pressure variation detecting type leakage inspection equipment which, in each measurement cycle, applies a fixed fluid pressure to an article to be inspected and measures variations in pressure associated with said article, said equipment comprising: pressure detecting means for detecting a change in pressure associated with said article under inspection and producing a pressure signal; amplifier means connected to the output of said pressure detecting means for receiving and amplifying said pressure signal, said amplifier means being zero-resettable and gain-adjustable; zero-resetting means for resetting the output of said amplifier means to zero, starting a measurement period T3 a fixed period after application of the fluid pressure in each measurement cycle; an A-D converter connected to the output of said amplifier means for converting the output signal from said amplifier into digital measured data D; storage means connected to the output of said A-D converter for storing said measured data D; averaging means connected to said storage means for computing an average value of as many as up to a predetermined number N of the measured data available in said storage means; correction value converting means for receiving the average value from said averaging means and operative to compute a correction value dDㆍT/T3 at a time T from the start of said measurement period T3 in each measurement cycle; correcting means connected to the output of said correction value converting means for producing corrected data DdDDs and producing an indication signal indicating whether said article under inspection is defective or non-defective.