| 摘要 |
FIELD: ion-mobility spectrometers and their checkup. ^ SUBSTANCE: proposed method for serviceability check of ion-mobility spectrometer incorporating surface-ionized ion thermoemitter, including spectrometer checkup dispensing with reference materials and for measuring spectrometer parameters in single cycle includes air pumping through spectrometer at volume velocity ranging between 2 and 10 l/min, application of dc voltage Uacc between thermoemitter plus and ion lens electrode minus, measurement of thermoemitter ion current Ite by means of external device, and setting of thermoemitter operating temperature Top between 250 and 650 °C and Uacc between 30 and 600 V so as to provide for thermoemitter ion current Ite of (10-11 - 10-8) A; recording of ion drift spectrum; evaluation of half-width of ion current peak in drift spectrum at half its height DeltaU, ion current peak maximum Imax, and compensating voltage Uc in ion current peak maximum; calculation of Kpc = (Imax/ Ite), and estimation of condition of ion mobility spectrometer incorporating surface-ionized ion thermoemitter by values of DeltaU, Kpc, and Uc and shape of collector ion current peak including thermoemitter current Ite. ^ EFFECT: facilitated procedure. ^ 5 cl, 6 dwg |
