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This standard specifies two total leak testing methods for spacecraft, including helium mass Spectrometer vacuum leak testing method and helium mass Spectrometer accumulation leak testing method. The standard specifies the general requirements, application objects, system composition, leak testing processes, and document’s requirements. The standard applies to the leak testing of spacecraft component, subsystem and system level products.
The detection of a test gas using mass spectrometers is far and away the most sensitive leak detection method and the one most widely used in industry. The mass spectrometer leak detector(MSLD) developed for this purpose make possible quantitative measurement of leak rates in a range extending across many powers of ten whereby the lower limit 10-13 Pa·m3/s, thus making it possible to demonstrate the inherent gas permeability of solids where helium is used as the test gas. It is actually possible in principle to detect all gases using mass spectrometry. Of all the available options, the use of helium as a tracer gas has proved to be especially practical. The detection of helium using the mass spectrometer is absolutely unequivocal. Helium is chemically inert, non-explosive, non-toxic, is present in normal air in a concentration of only 5 ppm and is quite economical.
A mass spectrometer will operate only in a vacuum. Due to the minimum vacuum level of 1×10-2 Pa, a high vacuum will be required. Turbomolecular pumps and suitable roughing pumps are used in modern leak detectors. Associated with the individual component groups are the required electrical- and electronic supply systems and software which, via a microprocessor, allow for the greatest possible degree of automation in the operating sequence, including all adjustment and calibration routines and measured value display.
Reģistrācijas numurs (WIID)
93363
Darbības sfēra
This standard specifies two total leak testing methods for spacecraft, including helium mass Spectrometer vacuum leak testing method and helium mass Spectrometer accumulation leak testing method. The standard specifies the general requirements, application objects, system composition, leak testing processes, and document’s requirements. The standard applies to the leak testing of spacecraft component, subsystem and system level products.
The detection of a test gas using mass spectrometers is far and away the most sensitive leak detection method and the one most widely used in industry. The mass spectrometer leak detector(MSLD) developed for this purpose make possible quantitative measurement of leak rates in a range extending across many powers of ten whereby the lower limit 10-13 Pa·m3/s, thus making it possible to demonstrate the inherent gas permeability of solids where helium is used as the test gas. It is actually possible in principle to detect all gases using mass spectrometry. Of all the available options, the use of helium as a tracer gas has proved to be especially practical. The detection of helium using the mass spectrometer is absolutely unequivocal. Helium is chemically inert, non-explosive, non-toxic, is present in normal air in a concentration of only 5 ppm and is quite economical.
A mass spectrometer will operate only in a vacuum. Due to the minimum vacuum level of 1×10-2 Pa, a high vacuum will be required. Turbomolecular pumps and suitable roughing pumps are used in modern leak detectors. Associated with the individual component groups are the required electrical- and electronic supply systems and software which, via a microprocessor, allow for the greatest possible degree of automation in the operating sequence, including all adjustment and calibration routines and measured value display.
