SU851254A1

SU851254A1 - Pulse oscillosgopic polarograph

Info

Publication number: SU851254A1
Application number: SU792824296A
Authority: SU
Inventors: Юрий Владимирович Добровольский; Игорь Анатольевич Чугунов; Юрий Иванович Кузьмин; Владимир Иванович Немтарев
Original assignee: Казанский Ордена Трудового Красногознамени Авиационный Институт Им.A.H.Туполева
Priority date: 1979-10-02
Filing date: 1979-10-02
Publication date: 1981-07-30

Description

(54) ИМПУЛЬСНЫЙ ОСЦИЛЛОПОЛЯРОГРАФ(54) PULSE OSCILLOPOLAROGRAPH

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Изобретение относитс к электрохимическому приборостроению и предназначено дл применени при разработке и конструировании пол рографической аппаратуры.The invention relates to electrochemical instrumentation and is intended for use in the design and construction of polarographic equipment.

Известны пол рографы, в которых дл расширени возможностей метода осциллографической пол рографии используютс специальные виды пол ризующего напр жени . В схемах этих пол рографов основную роль играет компенсатор , который служит дл поддержани на чейке заданного по величине и форме пол ризующего напр жени 1 .Polygraphs are known in which special types of polarizing voltage are used to expand the capabilities of the oscillographic polarography method. In the circuits of these polarographs, the main role is played by the compensator, which serves to maintain the polarizing voltage 1 set on the cell in size and shape.

Наиболее близким по технической сущности к предлагаемому вл етс осциллографический пол рограф с параллельной регистрацией катодных и анодных пол рограмм, содержащий генератор импульсного пол ризующего напр жени - последовательности пр мо угольных импульсов с линейно-растущей амплитудой, соединенный через компенсатор с чейкой, токосъемным резистором, подключенным к измеритель ному устройству, а также индикатор 2 .The closest in technical essence to the proposed invention is an oscillographic polarograph with parallel registration of cathode and anode polarograms, containing a generator of pulsed polarizing voltage — a sequence of direct coal pulses with linearly growing amplitude, connected through a compensator to a cell, a current-collecting resistor connected to the measuring device, as well as the indicator 2.

При работе этого пол рографа, особенно с растворами, обладающими During the work of this polograf, especially with the solutions possessing

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малым сопротивлением, или в услови х компенсации объемного сопротивлени с помощью устройств положи- тельной обратной св зи ток, проход 1ЧИЙ чейку, из-за наличи емкости двойного сло имеет характерные выбросы, амплитуда которых значительно превышает диффузионную составл ющую тока чейки. За счет падени на10 пр жени на токосъемном резисторе выходное напр л{ение компенсатора также имеет выбросы, амплитуда которых ограничиваетс максимальным выходным на1пр жением компенсатора, что due to the presence of double-layer capacitance, there are characteristic outliers, whose amplitude significantly exceeds the diffusion component of the cell current. Due to a drop of 10 voltages on the collector resistor, the output voltage of the compensator also has emissions, the amplitude of which is limited by the maximum output voltage of the compensator, which

15 приводит к искажению величины и фор- мы пол ризующего напр жени на чейке и в конечном счете вносит погрешность в измер емый в конце каждого импульсного напр жени диффузионный ток.15 leads to a distortion of the magnitude and shape of the polarizing voltage on the cell and ultimately introduces an error in the diffusion current measured at the end of each pulse voltage.

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Цель изобретени повышение точности задани пол ризующего напр жени на чейке.The purpose of the invention is improving the accuracy of setting a polarizing voltage on a cell.

Поставленна цель достигаетс тем, что в импульсный осциллопол рограф, The goal is achieved by the fact that in a pulsed oscillographic

Claims

25 containing a pulse polarizing voltage generator connected through a compensator to a cell and a collector connected to the measuring device and an indicator, a controllable resistance and feedback control circuit with a two-pole threshold and input to which is connected to the compensator output are entered, and the output is connected to the control input of a controlled resistance connected to the terminals of the current collector resistor. The drawing shows a functional diagram of the proposed polarographer. The polarograph contains a generator of pulsed polarizing voltage 1, a compensator 2 with a cell 3 and a current-collecting resistor 4, a controlled resistance 5, a feedback control circuit 6 with a two-pole threshold. The measuring device 7 and the electron-beam indicator 8. The oscillo-polarographer operates as follows. The signal from impulse polarizing voltage generator 1 is fed through compensator 2 and current collector; resistor 4 to cell 3, through which a significant capacitive current flows through the current pickup resistor at the moments of the pulse front impulse, causing a significant voltage drop across the current pickup resistor. When the latter reaches a certain threshold value chosen less than the maximum allowable output voltage of the compensator 2, the feedback control control circuit b with the two-pole threshold shunts the control resistor 4 with the help of controlled resistance 5 so that the output voltage of the compensator 2 will not exceed The selected threshold value thereby eliminates the distortion of the shape of the polarizing voltage across the cell electrodes. The current flowing through the cell 3 is measured at the end of the duration of each pulse using measuring device 7. Measurement results are displayed on the electron-beam indicator 8. When working with solutions with Mass resistance, or in terms of compensating for volume resistance By using positive feedback devices, limiting the voltage at the output of the compensator will not lead to a distortion of the polarizing voltage on the cell. The proposed “E11Y oscillopolarogrograph” makes it possible to significantly increase the accuracy of setting polarizing voltage on the hc, the efficiency of the energy consumed and the efficiency. Claims of the invention A pulse oscilloscope comprising a pulse polarizing voltage generator connected via a compensator to a current collector resistor and a cell, a measuring device connected to the current collector resistor, and an indicator, which is connected to In order to increase the accuracy of setting the polarizing voltage on the cell, a control impedance and feedback control circuit with a two-pole threshold, whose input is connected to the compensator output, and the output connected to the regulator ode controllable resistance connected to the collector terminals of the resistor. Sources of information taken into account in the examination 1. R. Nigmatull, V. Selev. Oscillographic polarography using step voltage. Fuck, t.XIX, 1964, p.545.

2. Bepavin V.A., Mikhailov V.A. Pulse oscillographic polarograph with parallel registration of cathode and anode polarograms. Factory Laboratory, 1969, 7, p. 769.