METHOD FOR SERVICEABILITY CHECK OF ION-MOBILITY SPECTROMETER INCORPORATING SURFACE-IONIZED ION THERMOEMITTER Russian patent published in 2005 - IPC

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 U_acc between thermoemitter plus and ion lens electrode minus, measurement of thermoemitter ion current I_te by means of external device, and setting of thermoemitter operating temperature T_op between 250 and 650 °C and U_acc between 30 and 600 V so as to provide for thermoemitter ion current I_te 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 ΔU, ion current peak maximum I_max, and compensating voltage U_c in ion current peak maximum; calculation of K_pc =_{(Imax/ Ite), and estimation of condition of ion mobility spectrometer incorporating surface-ionized ion thermoemitter by values of ΔU, Kpc, and Uc and shape of collector ion current peak including thermoemitter current Ite.}

EFFECT: facilitated procedure.

5 cl, 6 dwg