SU913211A1 - Device for measuring material physical chemical parameters - Google Patents

Description

The invention relates to devices for measuring the dielcometric method of physicochemical parameters, for example, humidity, concentration, acidity, etc. of various materials and can be used to study the properties of these materials.

A device for measuring physicochemical parameters (in particular, humidity) is known, which operates according to the method of comparing the frequencies of the working and reference oscillators. Such a device consists of a reference generator, a working generator, in the circuit of which is included a capacitive primary transducer of the mixer, detector, frequency meter and display device [1].

However, this device cannot operate at sound and lower frequencies, which limits its functionality.

The closest technical solution to the proposed device is to measure the physicochemical

2

parameters of materials, containing a sinusoidal signal generator, the output of which is connected to the primary transducer and the display device, a parallel KS chain connected to the primary transducer output and connected in series to the calculator of Fourier coefficients, arithmetic unit, generator frequency control unit (2).

Such a device makes it possible to directly measure the relaxation frequency of the polarization of the material under study, but it requires preliminary adjustment to a frequency that is obviously lower than the relaxation frequency. Thus, in the study of the properties of various materials, considerable time is spent on pre-selecting the initial tuning frequency.

The aim of the invention is to reduce the measurement time due to isz 9ΐ:

Turn on the time required to pre-select the initial tuning frequency.

The goal is achieved! the fact that the device has a trigger, an installation input of which is connected to the output of the arithmetic unit, and outputs with direct and reverse inputs of the frequency control unit, and a null organ (the input of which is connected to the output of the arithmetic unit, and the output with disconnecting input of the frequency control unit .

The drawing shows a block diagram of the device.

The device contains a sinusoidal signal generator 1, a primary converter 2 parallel to the KS chain 3, a calculator of Fourier coefficients 4, an arithmetic unit 5, a null organ 6, a trigger 7, a frequency control unit 8 and a display unit 9.

The device works as follows.

The primary converter 2 is filled with the test material and is included in the circuit. In the initial state, the trigger 7 is in an arbitrary position. When the circuit is put into operation, the sinusoidal signal generator 1 starts operating in the mode of increasing or decreasing digital frequency tuning depending on the state of trigger 7. The calculator • Fourier coefficients calculate the quadrature and in-phase voltage components on the output of the primary converter 2. At the same time, the arithmetic unit 5 calculates derivative of the dielectric loss tangent angle in frequency

with _n ,

If - · τ-χ__> o that is, the frequency is lower than Δω

relaxation frequency, then the trigger 7 is set to one state corresponding to the increase in the frequency of the generator 1. If <θ ’

trigger 7 is set to the zero state, corresponding to a decrease in the frequency of the generator 1. The frequency is controlled by the frequency control unit 8, which sets the frequency ramp up mode at the presence of direct input voltages and the frequency decreasing mode at the reverse input voltage. Thus, regardless of the initial state, the trigger 7 is set after the first frequency step to the position

’11 4

in which the generator operates in the mode corresponding to the approach to the maximum point, i.e. to

relaxation frequency. Upon reaching

5, the relaxation frequency signal at the output of the arithmetic unit 5 is zero. A null organ 6 is triggered, which sends a signal to the shut-off input of the frequency control unit 8, after which

Oh the last one stops. The value of the relaxation frequency. Is read from the display unit 9. The corresponding physicochemical parameters are determined from the previously constructed curves.

5 The device makes it possible to reduce the measurement time of the relaxation rate of the polymerization of the studied material by eliminating the time required for the preliminary selection of the initial tuning frequency.

The device can be used both in laboratory studies and in production conditions for measuring, for example, moisture content, acidity, concentration of solids in suspensions, etc.

Claims (1)

Claim A device for measuring the physicochemical parameters of materials, containing a sinusoidal signal generator, the output of which is connected to the primary transducer, and a display unit parallel to the KS chain connected to the primary output ³⁵ a converter connected in series to the calculator of Fourier coefficients, the arithmetic unit and the frequency control unit of the generator, characterized in that with 40 In order to reduce the measurement time, a trigger has been entered into it, the setup input of which is connected to the output of the arithmetic unit, and outputs with direct and reverse inputs of the frequency control unit ⁴⁵ , and a zero-body whose input is connected to the output of the arithmetic unit, and the output with disconnecting input control unit frequency. 5®