In Figure 9 the dependence of the generation frequency on the supply voltage at
different voltage control is presented. From the graphs presented, it is seen that
increasing control voltage increases the frequency region of generation. Experimental
dependence of the generation frequency on the voltage of control at different voltage
supply is shown in Figure 10. At a power supply of 5.5 V, the dependence is almost
linear. Therefore, the 5.5V value for the supply voltage is optimal.
Figure 9. Experimental dependence of generation frequency on voltage
1
U
at various voltage control
Figure 10. Experimental dependence of generation frequency on voltage of
control
2
U
at different power supply voltages
Figure 11 shows the dependence of the generation frequency on the concentration
of gas. As you can see from the graph, the best dependence on the transformation
function can be obtained if the supply voltage is equal to 5.5 V. As a gas sensitive
element, the resistive sensor of the firm Figaro (Japan) was used.
Figure 12 and Figure 13 show the dependencies of the generation frequency on
the propane gas concentrations, which were removed using sensors of the ACHE
production type in Ukraine and the UST firm (Germany).
- 495 -