In fluidics, frequency demodulating circuits (f/a converters) have been used in temperature sensors and revolutional speed sensors. The conventional types of the circuits were constructed by using some fluidic devices which were connected by transmission lines, and the operating frequencies were usually under 1kHz.
In this experiment, the frequency demodulation was conducted by only one fluidic element and the frequency range was up to 10kHz without using beat frequency technique.
The developed element was constructed by acting the main jet of the first stage to the main jet of the second stage directly without transmission line. By this method, the element with excellent frequency characteristics was obtained.
A fluid signal genarator which was able to obtain high frequency fluid signals was also developed in this study. The signal generator produced up to 10kHz with a nearly constant amplitude.
By applying the fluid signal to the fluidic element directly without using beat frequency technique, the operation up to 10kHz was recognized. The output pressure change was about 17Pa/Hz.