Publication Details (including relevant citation information):
J. Vac. Sci. Technol. A 18(4), 1755 - 1757 (2000).
|07.30.Hd||Vacuum testing methods; leak detectors|
A new type of leak detector (LeakD) was developed using the principle of selective and sensitive oxygen detection using oxygen-ion-conducting ceramics, e.g., yttria-stabilized zirconia (YSZ). By comparing the experimental results of the LeakD with a quadrupole mass spectrometer (QMS) and other methods, it was clear that (1) at a large leak, the data of LeakD coincided with theoretical values; (2) at a small leak, the P(O2)vaccalculated from the electromotive force (emf) of LeakD differed from the P(O2)vac of QMS, especially at higher temperature for YSZ; (3) at a small leak, using tandem two LeaksDs under both sensing surfaces of YSZ evacuated with any different oxygen partial pressures about 100–10−6,P(O2)vac obtained from the emf of LeakD nearly coincided with the theoretical values; and (4) a leak point is found by blowing nitrogen gas on the point. The phenomena of (2) and (3) showed that the oxygen-ion-conducting ceramics may be especially influenced by a total pressure less than 10−3 or 10−4 Torr. The simple and small LeakD has good reproducibility and rapid response, and it is assumed that it has a smaller outgassing rate compared to some gauges with filaments. The LeakD can continuously detect a leak in the routine installation, and also inform others of an accident or emergency. The LeakD is a convenient and highly sensitive leak detector compared to a traditional helium leak detector using a QMS.