SU1117501A1 - Moisture meter - Google Patents

Abstract

one . VLAGOMER, containing a radiation source, in the course of radiation of which a filtering modulator with a synchronous motor is installed, connected in series to a radiation detector, pre-amplifier, synchronous detector, control inputs of which are connected to a synchronous pulse generator, a dividing unit and a measuring unit, characterized in that In order to increase the reliability of measurements and expand the range of application of the moisture meter, analogue converters are introduced into it - the code of the reference and measuring channels, the computational unit unit, subtraction unit, optical parameter measurement error setting unit, comparison unit, AND element, logic unit, key, delay lines, inverter, alarm unit, pulse counter, the first input of which is connected to the output of the synchronous pulse generator, and the second input - to the output the delay line, the output of the pulse counter is connected respectively to the input of the delay line, to the second inputs of the computation unit and the logic block and to the third inputs of the comparison and subtraction blocks, the first input of the latter is connected to the output of the calculator The second input of the subtractor is connected to the output of the division unit connected to the first inputs of the key and logic unit, the output of the subtraction unit is connected to the first input of the comparison unit, the second input of which is connected to the output of the optical measurement error setting unit, and the output of the comparison unit to the first the input element And, the second input of which is connected to the output of the logic unit, the output of the element And g through the inverter - to the alarm unit and to the second input of the key, the output (which is connected to the measuring input unit) y, the first input of the calculating unit is connected to the output of the converter S analog - the code of the reference channel, connected to the first input of the dividing unit, the second input of which is connected to the output of the converter analog - the code of the measuring channel, h1 inputs of the analog converters - code O1 connected to the outputs of the synchronous detector . 2. Moisture meter pop. 1, characterized in that the logic block contains blocks for setting the minimum and maximum values of the optical indicator, two comparison blocks and an AND element, the output of which is connected to the output of the logic block, and the inputs respectively to the outputs of the comparison blocks, the first inputs which are connected to the outputs of the blocks setting the minimum and maximum values of the optical indicator, the second

Description

the inputs of the comparison units to the first output of the logic unit, and the second 1117501 input of the logic unit to the third inputs of the comparison units.

one

The invention relates to an infrared measurement technology and is intended for measuring the humidity of continuous-made materials and small piece goods (such as briquettes, plates, tablets, etc., and can also be used to continuously control the moisture content of semi-finished tea at tea-machine outputs .

A device is known for contactless measurement of the humidity or concentration of other substances in a moving material float containing a radiation source, filter holder, DC amplifier, through a capacitor connected to the source and (radiation, interference filters Motor, signal detector, radiation receiver and measuring unit

The disadvantage of this device is its limited use, since it can only be used to measure the moisture of cloths, but it cannot control the moisture of bulk materials and small piece goods.

The closest to the invention to the technical essence is a moisture meter containing a radiation source, the radiation modulator is equipped with a synchronous motor filter modulator, a radiation detector connected in series, a preamplifier, a syphonic detector whose control inputs are connected to a generator of synchronous pulses , dividing unit and measuring unit 2.

A disadvantage of the known moisture meter is that when foreign material that is in a controlled or unfilled conveyor belt gets into its irradiation zone, the readings related to the foreign surface are also included in the readings of the humidity of the controlled material.

which negatively affects the measurement accuracy.

In addition, a lime moisture meter cannot be used to measure the humidity of flowable small piece goods, such as tablets, plates, briquettes, also because the moisture content reads information about the unfilled surface of the conveyor on which the controlled goods are located. This limits the range of application of the moisture meter.

The purpose of the invention is to increase the reliability of measurements and expand the range of application of the moisture meter.

The goal is achieved by the fact that a moisture modulator containing a radiation source, along which radiation a filtering modulator with a synchronous motor is installed, a series-connected radiation detector, a preamplifier a synchronous detector, the control inputs of which are connected to a synchronous pulse generator, a dividing unit and a measuring unit , the analog-code converters of the reference and measuring channels, the calculation unit, the subtraction unit, the unit for setting the measurement error of the optical indicator were introduced , comparison unit, AND element, logic unit, key, delay lines, inverter, alarm unit, pulse counter, the first input of which is connected to the output of the synchronous pulse generator, and the second input is connected to the output of the delay line, the output of the pulse counter is respectively connected to the line input delay, to the second inputs of the computation unit and the logic block and to the third inputs of the comparison and subtraction blocks, the first input of the last one is connected to the output of the calculation block, the second input of the subtraction unit is connected to the output of the division unit connected to By the primary inputs of the key and the logic unit, the output of the subtraction unit is connected to the first input of the comparison unit, the second input of which is connected to the output of the optical measurement measurement error setting unit, and the output of the comparison unit to the first input of the And element, the second input of which is connected to the output of the logical the unit, the output of the element And through the inverter to the alarm unit and to the second input of the key, the output of which is connected to the measuring unit, the first input of the calculating unit is connected to the output of the analogue converter - reference channel code la, connected to a first input of a dividing unit, the second input of which is connected to the output of the converter analog - measuring channel code converters analogue inputs - code connected to the outputs of the synchronous detector.

In addition, the logic block contains the minimum and maximum values setting of the optical indicator, two comparison blocks And element, the output of which is connected to the output of the logic block, and inputs respectively to the outputs of the comparison blocks, the first inputs of which are connected to the outputs of the minimum and maximum settings blocks the optical indicator, the second inputs of the comparison units to the first input of the logic unit, and the second input of the logic unit to the third inputs of the comparison units.

Figure 1 shows the functional scheme of the proposed moisture meter; FIG. 2 - the same logical block.

The moisture meter (Fig. 1) contains sources 1 and 2 of power supply and radiation, respectively, a filter modulator 3 with a synchronous motor 4 serially connected radiation detectors 5, a preamplifier 6, a synchronous detector 7, the control inputs of which are connected to a generator of 8 synchronous pulses, and The two outputs are each connected with their converter 9 and 10 analogue — a code, respectively, of the measuring and reference signals, the outputs of which are connected to the inputs of the dividing unit 11. The first input of the counter 12 pulses is connected to the generator output 8 synchronous pulses

and the second input (reset input) - to the output of the line 13 delay.

The device also comprises a subtraction unit 14, a calculation unit 15, a comparison unit 16, an optical measurement measurement error setting unit 17, AND unit 18, a logic unit 19, an inverter 20, a signaling unit 21; a key 22, a measuring unit 23. Logic unit 1 is implemented in the form of a unit 24 for setting the minimum value of an optical indicator (Fig.2), two units 25 and 26 for comparison, a unit 27 for setting the maximum value for an optical indicator and an element 28 And the output of pulse counter 12 is connected respectively to the input of the delay line 13, to the second inputs of the computing unit 15, the logic unit 19 and to the third inputs of the subtraction unit 14 and the comparison unit 16.

The first input of the subtracting unit 14 is connected to the output of the calculating unit 15, and the second input to the output of the division unit 11 connected to the first input of the key 22 and the logical unit 19. The output of the subtracting unit 14 is connected to the first input of the comparison unit 16, the second input which is connected to the output of the unit 17 for setting the measurement error of the optical indicator. The output of the comparison unit 16 is connected to the element 18, the second input of which is connected to the output of the logic unit 19. The output of the element 18 is connected via the inverter 20 to the alarm unit 21 and to the second input of the key 22, the output of which is connected to the measuring unit 23. The first input of the block 15 calculation is connected to the output of the converter 10 analogue - the code of the reference channel ...

The logic unit (Fig. 2) contains units 24 and 27 for setting the minimum and maximum values of the optical index of the material being measured, two units 25 and 26 of comparison, and element 28, the output of which is connected to the output of the logic unit, and the inputs respectively to the inputs of units 25 and 26 comparisons, the first inputs of which are connected to the outputs of blocks 24 and 27 of setting the minimum and maximum values of the optical indicator, the second inputs of the comparison blocks to the first inputs of the logic block 19, and the second input of the logic block 19 to the third inputs of the blocks 25 and 26 comparisons. The device works as follows. The light radiation 2 passes through the interference filters mounted on the filter module 3, which rotates from the synchronous motor 4. These filters pass only billow infrared rays, L 1.95 µm (measurement wavelength) p 1.75 µm (reference wavelength), The substance being measured is alternately illuminated with h; wave radiation. The reflected pulses of the measured substance are transmitted to the radiation detector 5, where they are converted into electrical pulses, which, through the preamplifier 6, are fed to the synchronous detector 7, which controls the generator of 8 synchronous pulses. Synchronous pulses (Provide alternate transmission of the reference and measuring signals from the synchronous detector "Respectively to converters 9 and 10, the analog is the code of the measuring and reference channels. The reference signal simultaneously arrives at the first input of the calculating unit 15. From converters 9 and 10 analog-code signal ly enters the division unit 11 and the results of the division are simultaneously fed to the first input of logic unit 19, the second input of the subtraction unit 14 and to the first input of the key 22 through which are fed to the measuring unit 2 3. Synchronous pulses from generator 8 are fed to the input of counter 12, at the output of which a logical enabling signal appears every two pulses (two pulses are needed to pass the reference and measuring signals and to determine the optical value from A pulse counter is fed to the input of the delay line 13, which provides a delay for the comparison resolution, subtraction and calculation signal, in order for any of the listed operations to occur. 016 In addition, the enabling signal is simultaneously applied to the second input (the calculation enable input) of the calculating unit 15, to the second input of the logic unit 19, to the third inputs (enable inputs of the subtraction and comparison) of the viitian unit 14 and the comparison unit 16. As a result, in calculation block 15, the calculated optical value is calculated, which is a function of the reference. (U) And in the subtraction block, the difference itl (R-P) is determined. The value of the difference in the LP of the said signals is fed to the comparison block 16, which is the comparison of the magnitude of the difference (P) with the predetermined value of the measurement error of the optical index P supplied from block 17. If the condition П П ° is met, the output of the comparison block 16 appears logical - the unit that is supplied And the first input element is AND 18. If the condition & n 6 q A j.j fails, the output of block 16 does not appear as a logical unit. A logical unit from logical unit 19 is supplied to the second input of the And 18 element in the case when T is within the limits. .ma1. sym .. The principle of operation of logic block 19 is illustrated by the flowchart shown in FIG. 2. The current value of the optical indicator from block 11 is fed to the first input of logic block 19, in particular to the second inputs of comparison blocks 25 and 26, and the third input (comparison resolution input) of blocks 25 and 26 is supplied with a logical unit from the old input of the logic block. In blocks 25 and 26, the comparison is compared with the value of the optical index HT. When conditions are met P P and p-hex. A logical unit is applied to both inputs of the AND 28 element. Then at its output there appears a logical unit, which is fed to the second input of the And 18 element. If the second input of the And 18 element is fed from the 16th logical unit, the output of the element

That 18 appears the signal that is fed to the second input of the key 22. The key opens and provides the transmission to the measuring unit 23 of the results of the division from the unit 11. In those cases when the LP condition is t

yP t orP.P% P “not

It is completed, the current value of the optical indicator is not applied to the measuring unit, and the output of AND 18 is followed by a logical zero, which is fed through the inverter 20 to the signaling unit 21. This means that infrared radiation falls on an area in which not only the measured substance enters, but also a foreign surface (conveyor, stone, etc.). Thus, the introduction of unreliable primary signals into the instrument readings is prevented.

175018

The proposed device improves the accuracy of the measurement of the optical index and functionally related humidity values by eliminating the integral value. optical index, which includes the values of the optical index of the corresponding homogeneous materials caught in the stream, or

o the area of the conveyor that has got into the irradiation zone, continuously controls the measurement of the moisture of the solid materials in the stream, detects foreign materials that are

5 on the conveyor, and generates an appropriate signal, and also measures the moisture content of small piece goods (such as briquettes, tiles, tablets, etc.) on the conveyor. All this

0 leads to the expansion of the field of application of the device.

Claims (2)

1. HUMIDIFIER containing a radiation source, along the radiation of which a filter modulator with a synchronous motor is installed, a radiation detector, a pre-amplifier, a synchronous detector, the control inputs of which are connected to a synchronous pulse generator, a division unit and a measuring unit, characterized in that, in order to increase the reliability of measurements and expand the scope of the hygrometer, analog converters are introduced into it - the code of the reference and measuring channels, a calculation unit, a subtraction unit, a unit for setting an error in measuring an optical indicator, a comparison unit, an AND element, a logical unit, a key, a delay line, an inverter, an alarm unit, a pulse counter, the first input of which is connected to the output of the synchronous pulse generator, and the second input to the output of the delay line , the output of the pulse counter is connected respectively to the input of the delay line, to the second inputs of the calculation unit and the logical unit and to the third inputs of the comparison and subtraction units, the first input of the latter is connected to the output of the calculation unit, sec the input of the subtraction block is connected to the output of the division block connected to the first inputs of the key and the logic block, the output of the subtraction block is connected to the first input of the comparison block, the second input of which is connected to the output of the reference block for the measurement accuracy of the optical indicator, and the output of the comparison block to the first the input of the And element, the second input of which is connected to the output of the logic unit, the output of the And element through the inverter is to the signaling unit and to the second input of the key, the output of which is connected to the measuring unit, the first input of the block you Islenyev connected to an output analogue converter - the reference code for the channel connected to the first input of the dividing block, the second input of which is connected to the output of analog transmitter - measuring channel code converters analogue inputs - code connected to the outputs of the synchronous detector. 2. ' The moisture meter according to claim 1, characterized in that the logic unit contains blocks for setting the minimum and maximum values of the optical indicator, two comparison blocks and an element And whose output is connected to the output of the logical block, and the inputs, respectively, to the outputs of the comparison blocks, the first the inputs of which are connected to the outputs of the set-. ki of the minimum and maximum values of the optical index, the second> the inputs of the comparison blocks - to the first ’input of the logical block - to the third input of the logical block, and the second inputs of the comparison blocks.