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Journal Achievements of Modern Radioelectronics №10 for 2014 г.
Article in number:
Methods for detection of charged particles in the hyperboloid mass analyzers based on three-dimensional ion trap
Keywords: spectral method of substances analyses gas chromatography detection of ion currents signals analog registration systems ion of counting method the method of digital signal acquisition
Authors:
A.P. Borisovsky - Ph.D. (Eng.), Associate Professor, Department «Industrial Electronics», Ryazan State Radio Engineering University. E-mail: apb213@yandex.ru
V.V. Soldatov - Ph.D. (Eng.), Associate Professor, Department «Cosmic Technologies», Ryazan State Radio Engineering University. E-mail: vvs2008@yandex.ru
O.V. Rozhkov - Dr.Sc. (Eng.), Professor, Bauman Moscow State Technical University
Abstract:
Trends in the development of analytical instrumentation currently define the increased use of spectroscopic methods. This primarily refers to mass spectrometry, which in combination with gas chromatography howling commonly used as a reference (test) method. Range of substances investigated by gas chromatography - mass spectrometry, this compound with mass numbers 600-700 a.m.u. The sensitivity and selectivity of the method can detect and identify real properties at the level of 10-12 g. The need to identify the complex and diverse organic compounds requires fixing molecular ion peaks and peaks with large mass numbers because these peaks are maximum load information. The main problems with this are the presence of discrimination in the ionization of the masses, and especially during the detection signal from different ions. Objective was to develop a new method for the detection of charged particles in a quadrupole mass analyzer operating in the mode of mass selective accumulation. To solve this problem has been developed, simulated and experimentally tested the system with digital signal accumulation. It includes: - secondary- electron multiplier, - current-voltage converter, - highpass filter, - a non-inverting voltage amplifier, - lowpass filter, - an analog- to-digital converter, - an accumulator, - output register. An analysis of the experimental data were formulated technical requirements for all nodes of the system of registration. Test developed recording system showed that it is possible to register via the mass spectra in the range 10-700 a.m.u. dynamic range D=5∙105, and that is sufficient for use in chromatographic mass detector.
Pages: 64-67
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