SU1462986A1 - Gas analiser - Google Patents

Abstract

The invention can be used to control gaseous substances. The purpose of the invention is to improve the accuracy of research. The gas analyzer contains the optical part I, the modulator 2 of the synchronization unit, the receiver 3 of the radiation of the amplifier 5, the block 6 of the difference signal, the block 7 of the sum signal, the divider 8 of the recorder voltage. The processing circuit generates a signal proportional to the quotient from dividing the difference signal into a constant or variable sum signal. 3 3.p. f-ly, 4 ill.

Description

one

The invention relates to the field of analytical instrumentation and can be used to control emissions of industrial enterprises and vehicles into the atmosphere, as well as in a number of technological processes that require the control of gaseous substances.

The purpose of the invention is to improve the measurement accuracy.

Figure 1-4 shows the structural diagrams of the gas analyzer with a different, electronic version.

The gas analyzer (Fig. 1) contains the optical part 1, including the working and reference channels, the modulator 2, configured to modulate the radiation fluxes of the working and reference channels with a time shift, the radiation receiver 3, the synchronization unit 4, associated with modulator 2, amplifier 5, block 6 of the difference signal, block 7 of the sum signal, voltage divider B and recorder 9.

Between the voltage divider 8 and the recorder 9 or between the differential signal unit 6 and the divider 8, a synchronous detector unit 10 with a low-pass filter can be switched on, the control input of which is connected to the synchronization unit 4 (Fig. 2.3). In addition, the summation signal unit 7 can be connected to the control input of the voltage divider 8 via an electronic modulator II, the control input of which is connected to the unit. 4 synchronization (figure 4).

The device works as follows (fig.I).

The radiation fluxes passing through the working and reference channels of the optical part 1 are modulated alternately with a shift in time by means of the modulator 2 and directed to the radiation receiver 3. The output signal of the radiation receiver 3 is amplified by the amplifier 5 and is fed to the inputs of the block 6

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differential signal and block 7 total signal. .

At the output of block 6 of the difference signal, an alternating voltage is formed, the amplitude of which is proportional to the difference of the intensities of the fluxes of radiation transmitted through the working and reference channels of the optical part 1. This voltage is applied to v th one of the inputs of the divider 8 voltages. Block 7 of the sum signal allows one to obtain a constant voltage, the value of which is proportional to the sum of the intensities of the fluxes of radiation, transmitted through the working and reference channels. This constant voltage is applied to the control input of the voltage divider 8, which

Claims (4)

1. A gas analyzer containing an optical part comprising a radiation source optically coupled via a modulator, a working and reference cell to a radiation receiver connected to a signal processing circuit containing a series-connected amplifier, a differential signal unit and a recorder, as well as a synchronization unit connected to the I modulator, one of the outputs of which is connected to the control input of the differential signal unit; and a sum signal block that is different in topic. carries out the division of variable sig-20 that, in order to increase the accuracy of u with „. , ftj-i gtgchgtgch TttTLIT R. TTCHMP in at 6 25 The voltage on the CONSTANT with the formation of a quotient in the form of an alternating signal, whose frequency is equal to the frequency of the differential signal, and the amplitude is proportional to the difference between the intensities of the fluxes of flux passed through the working and reference channels. This variable signal, if necessary, is rectified using a synchronous detector block 10 with a low-pass filter and fed to the recorder 9. The control voltages for the differential signal block 6 and block 10 are removed from the outputs of block 4 connected to the modulator 2. ..;, / Divider 8 can divide two alternating voltages to produce a partial from division as a constant signal. To obtain alternating voltage, the amplitude of which is proportional to the sum of the intensities of the working and reference channels, the frequency is equal to the frequency of the difference signal, electronic modulator 1I is used, controlled from one of the outputs of block A (Fig. 4). Since the constant voltage is removed from the output of the divider S, there is no need to use the block 10. thirty measurements, the voltage divider is additionally introduced into it, the modulator is configured to alternately modulate radiation fluxes in the working and reference channels, the input of the sum signal unit is connected to the output of the amplifier, the output is connected to the control input of the voltage divider, and the difference signal unit and the registrar is connected via a voltage divider. 2. The gas analyzer of claim I, which is based on the fact that the voltage divider and the recorder are connected 35 via a synchronous detector unit to a low-pass filter, the control input of which is connected to the synchronization sync unit. 3. Gas analyzer according to claim 1, so that the differential signal unit and the voltage divider are connected through a synchronous detector unit with a low-pass filter whose control input is connected 45 with synchronization blocks. 4. The gas analyzer of claim I, which is different in that the output of the total signal block is connected to the equal input of the divider voltage 50 through an electronic modulator whose control input is connected to a synchronization unit. 40 6 The gas analyzer allows three times and more to improve the accuracy of measurements. . Invention Formula 1. A gas analyzer containing an optical part comprising a radiation source optically coupled via a modulator, a working and reference cell to a radiation receiver connected to a signal processing circuit containing a series-connected amplifier, a differential signal unit and a recorder, as well as a synchronization unit connected to the I modulator, one of the outputs of which is connected to the control input of the differential signal unit; and a sum signal block that is different in topic. that, in order to increase the accuracy of that, in order to increase the accuracy of it, ftj-i gtgchgtgch TttTLIT R. TTCHMP in in 6 five thirty measurements, a voltage divider is additionally introduced into it, the modulator is designed to alternately modulate radiation fluxes in the working and reference channels, the input of the sum signal unit is connected to the amplifier output, the output is connected to the control input of the voltage divider, and the difference signal unit and The registrar is connected via a voltage divider. 2. The gas analyzer of claim I, which is based on the fact that the voltage divider and the recorder are connected 35 through a synchronous detector unit to a low-pass filter, the control input of which is connected to the synchronization unit. 3. The gas analyzer of claim 1, wherein the difference signal unit and the voltage divider are connected via a synchronous detector unit to a low-pass filter, the control input of which is connected 45 with synchronization blocks. 4. Gas analyzer according to Claim I., characterized in that the output of the sum signal block is connected to the control input of a voltage divider 50 through an electronic modulator whose control input is connected to a synchronization unit. 40 Phi.1 0t / 2.3 F1 / 1, If