SU1019522A1 - Mass indicator for quadrupole mass spectrometer - Google Patents

Abstract

INDEX OF MASS FOR A SQUARE OF FULL MASS SPECTROMETERS, containing 1. the amplitude detector, whose input is connected to the output of the source of the HS power voltage analyzer, and the voltage emulator / o t Jt and h and c with the fact that, in order to increase the exact HopTri count of the number of analyzed ions, The sequential controlled source was entered into it; voltage nickname, voltage switch, two integrators and a peak detector located between the amplitude-detector output and the measurement input. When the voltage switch is switched, the input of the switch is connected to the output of the frequency divider, whose input is connected to the output of the voltage supply source of the voltage analyzer

Description

about this

ND

The invention relates to the field of quadrupole mass spectrum of electrons, namely, devices for indicating mass numbers of ions, analyzed by quadrupole mass spectrometer.

The mass indicator for a magnetic mass spectrometer, known as the Hall effect principle, is known. The generated signal in the spectrometer is proportional to the field field strength in the magnetic analyzer of the spectrometer, which is tentative at the acceleration rate of the oscillator: therefore: this signal is proportional to the mass number of ions t13

However, the device has a low counting accuracy.15

Ja11 is closer to the technical SU14NOST to the foregoing, the mass index for; quadrivolous

mass spectrometers, which is an amplitude detector, the input of which is connected to the power source analyzer, voltage, and the high-frequency reference device of the power voltage analyzer. The voltage from the output of the 25th vector, equal to the amplitude of the high-frequency component of the voltage generator, is fed directly to the mass measurement device, a voltmeter or a circuit Q cp VNeni with a known reference voltage, which is programmed in a mass scale that has been distributed in a mass scale with a known reference voltage of one mass scale of a mass generator;

Because; in quadrupole mass spectrometers, the mass number is analyzable, and it is proportional to the amplitude of the high-frequency astrometer. component of the power voltage monitor and, inversely proportional to the square of its frequency, / then.; These pointers accurately reflect the values. masses only when unwrapping 0

mass: spectrum by changing the amplitude of the n;

perfect frequency stability. AT

the case of frequency nonstandard or a change in its value of zero, and 45 also in B: the case of a sweep of the mass spectrum

The change in amplitude is both; Frequencies go to the frequency of the frequency of the voltage. A voltage tester readings daNtschlh. The indications do not correspond to iicwe-so ru; miacci.;. . ; . :, /.,. „. . The purpose of the invention is to improve the accuracy of the calculation of the mass number.

yadizyrukolkh ions. at Duby values of the amplitude and frequency of the feed cj anadizer; Voltage;

The goal is achieved by the fact that, in the mass index for quadrupole mass spectrometers, containing an NMLIT detector, the input of which is. A voltage analyzer and a voltage meter are connected to the output of the power supply source; the voltage source is controlled in series. A controlled voltage source, a voltage switch, two integrators and a peak detector are 65

A torus located between the output of the amplitude detector and the input of the voltage meter, while the main input of the voltage switch is connected to the output of the frequency divider, the input of which is connected to the output of the source supplying the voltage analyzer.

FIG. 1 shows a block diagram of the proposed device; Fig. 2 Figures 2 and 2 show epiures of stresses at different points .. ...-.,. The device contains a controlled one. voltage source 1, frequency divider 2, voltage switch 3, integrators 4 5, and peak detector b and voltage meter 7.

The device generating a constant voltage works as follows

A controlled voltage source produces a low voltage, which is a progressive voltage, at its input — Ufjjj SF. 2a) V Divider 2, when a sinusdal signal U is applied to its input (Fig. 2b) I forms at its output right-angled, pulses with a duty cycle: 2 (Meander type) and with frequency fg, prprprcirrinal; The frequency of the input signal (Fig. 2-in). Switch 3 Ex. The voltage applied to these pulses switches the output voltage of the controlled voltage source 1. The output Cv signal of the switch 3 is fed through a disconnect and is supplied to the distributor 8 per in: the course of the first integrator 4, thanks to which the voltage Uit is not. the course of the integrators (Fig. 2d). represents a rectangular symmetrical 1 # oscillation®

with amplitude ijj, -Y and frequency

The string is proportional to the corresponding voltage of the control source of the source and the voltage of the Cros and the often-i TefngpHa input; divider 2 h; asthoty. At the output of the integrator 6, the voltage (predpravavl a symmetric three; Y) Ln6e oscillation H-FIG. 2e) with the same frequency with an amplitude of Oh directly proportional to the amplitude of un, c and

period

input voltage U-J.- and d. Since the integral of linearly varied. Voltage is a parabolic function of time, and the numerical value of IntegraDa is equal to the area of the integrable function, then the triggered voltage after integration of In integrator 5 takes the form of a periodic oscillation Uyi (Fig. 2e), which represents the Segment of Parabolic parabol. The amplitude Uyfl and this oscillation is proportional to the foot of the triangle ABC (Fig. 2e), i.e. equals

- 1 U i

VO 2 VMT 2. Urnu-UnCT Since T.,, and Ta -r- is 7TO amplitude U (n and a-V is directly proportional to the voltage Ujjpf and inversely proportional to the square of the frequency. Peak detector b amplitude, is converted to equal It has a constant voltage (Fig. 2g). As a result, the output voltage of the device is directly proportional to the constant voltage at the input of the controlled voltage source and inversely proportional to the square of the frequency at the input of the splitter 2 frequency. The proposed device when filling it with integrated operational amplifiers have high performance Ability and accuracy (on the order of 1%; when changing SO or 10 times). The device allows you to accurately count the mass quantities of ions being produced at any values of "amplitude and frequency n such as degraded, voltage LIZATOR.

G PP

Claims (1)

MASS INDICATOR FOR SQUARE FULL MASS SPECTROMETERS / containing an amplitude detector, the input of which is connected to the output of the power supply? напряженияο a voltage analyzer, and a voltage meter, with the exception that, in order to increase the accuracy of counting the weight numbers of the analyzed ions, sequentially included .. controlled voltage source, switch voltage, two integrators and a peak detector located between the output of the amplitudes of the detector and the input of the voltage crossbar measuring switch, while the switching input of the voltage switch is connected to the output of the frequency divider, the input of which is connected to the output of the source of the analyzer supply Costumed .. Fig.) F a torus located between the output of the amplitude detector and the input of the voltage meter, while the switching input of the voltage switch is connected to the output of the frequency divider, the input of which is connected to the output of the source of the voltage analyzer ·. To fig. 1 presents a structural diagram of the proposed device; figure 2-diagram of stresses at different points. The device contains a controlled voltage source 1, frequency divider 2, voltage switch 3, integrators 4 and 5, and peak detector 6 and voltage meter 7. The DC voltage generating device operates as follows The controlled voltage source 1 produces a low-voltage voltage, strictly proportional to the voltage at its input and _p07 (Fig. 2A). A frequency divider 2, when a sinusoidal signal Oper is applied to its input (Fig. 2b) ', generates rectangular pulses with a duty cycle 2 (Meander type) and with a frequency £ _e proportional to: the frequency of the input signal £ _pe (Fig. 2c) . The voltage switch 3, by the influence of these DO pulses, commutes the output voltage of the controlled .. voltage source 1. The signal from the output of switch 3 is fed through a junction box. 8 ^ capacitor to 35 input of the first integrator 4, due to which · voltage Ou. at the input of the integrators (Fig. 2d) is a rectangular symmetrical oscillation ¹ with amplitude U _mu = and frequency 'strictly proportional to st;