초록 ▼

A method of compensating for temperature variations in testing part cavities for leaks by placing a fluid pressure source in communication with the cavity and measuring the flow rate to the cavity to determine the rate of any leakage. The method establishes a temperature compensation function by mea

A method of compensating for temperature variations in testing part cavities for leaks by placing a fluid pressure source in communication with the cavity and measuring the flow rate to the cavity to determine the rate of any leakage. The method establishes a temperature compensation function by measuring the shift in flow rates resulting from changes in temperature of a sample test part, which temperature compensation function allows correction of the flow rates during subsequent testing according to the sensed temperature of the test part. Flow rates are measured at two differing temperatures to determine the temperature compensation function by linear regression, since the flow rate shift with temperature varies substantially linearly.

대표청구항 ▼

A method of temperature compensating measurements of leak rates from a cavity in a part to be leak tested, said leak rate measurements achieved by placing said cavity in communication with a source of fluid under a predetermined pressure and measuring the flow rate to said cavity from said source, s

A method of temperature compensating measurements of leak rates from a cavity in a part to be leak tested, said leak rate measurements achieved by placing said cavity in communication with a source of fluid under a predetermined pressure and measuring the flow rate to said cavity from said source, said method comprising the steps of: initially establishing a temperature compensating function by: placing said source of fluid pressure in communication with the cavity of a sample part, at each of a plurality of temperatures of said sample; measuring the shift in flow rate to said cavity of said sample part caused by a change between said plurality of temperatures; measuring each of said plurality of temperatures; generating by linear regression from said measured temperatures and flow rates a temperature compensation function; placing the cavity of each part to be leak tested in communication with said source of fluid at said predetermined pressure; measuring the flow rate to said cavity from said source of fluid at said predetermined pressure; measuring the temperature of said part to be tested; applying a temperature compensation factor from said generated temperature compensation function corresponding to said measured flow rate, whereby a temperature corrected flow rate to said cavity is determined.