Thursday, June 18

Fluid Amplifiers Electronics Seminar Topics

Updated on 18/6/2015

Basic Principle Of Fluid Amplifier

          Most popular application of fluidics is amplifiers. A fluid amplifier is basically a flat piece of metal or plastic in which shallow passages are engraved for the flow of fluid.

The arrangement of these passages differs for each type of fluid amplifiers, but in principle all the amplifiers have a main power stream, which changes its direction of control jet.

          The tendency of fluid to chose one side of a symmetrically diverging channel and flow in an asymmetric way is called “Conda effect” in honor of the first man (in 1930’s) to observe and utilize the phenomenon. Subsequent work has shown that, if symmetrically placed splitter is very close to the entrance part of the main power jet, then this jet is divided equally in both channels.

Fluid Amplification

          Amplification function can be achieved by employing fluid amplifier. The amplifiers may be electronic or fluidic. Amplifier is a device which gives a large change in output of either pressure or both as a result of small change in control input. In other words we can say that amplifies its input signals.

Generally amplifiers are of following types.
     1. Digital amplifiers
     2. Analogue amplifiers


This method is used to blow the whistle at pre adjusted time and employs NOT-AND logic functions.

Supply tubes are counted to the clock from the rear at 12 points (at 5 minute intervals). The output tubes are fixed in the clock glass exactly opposite to the supply tubes. The minute hand moved in the gap between these supply tubes and output tubes. These minute hands interrupt the passage of the jet.

Air is supplied to all the 12 supply tubes and to any one of the output tubes. The output tube is connected to the NOT element through a flexible pipe. In the normal position (when minute hand is not interrupting the jet) input signal remains on’ which results switching off the output. Thus the NOT element normally remains ‘off’ and it starts when the minute hand interrupts the air system.

When the lever valve is on position and supply from it is on, AND element will not operates until NOT elements also supplies the output as shown in the figure. Thus when both signals are supplied (i.e. at the point when minute hand interrupts the air system) the AND unit will operate the step up relay which then blow the whistle.

Thus the whistle can be blow at any preset time, by providing the interruptible jet at that particular position on the dial. Timing –with the minute hand interrupting the jet, output tube at 3 (at 15 minute position) and lower valve is in on position, AND function is complete, whistle is blowing.

Logical Function NOT

This logic function can also be achieved by employing one turbulent amplifier. If one input signal is used, the result is NOT i.e. No output will be available. This is also known as ‘signal inversion’.

Logical Function OR

This logic function can be achieved by two turbulent amplifiers. If an input signal either A or B or C or D is applied to turbulent amplifier X, then output from this amplifier will be off. As shown in figure this will cause the input signal E to turbulent amplifier T to be off. This will result in output from the amplifier.


1. Nuclear application: - Neutron flux detector                                                                
2. Industrial application:-Sewing machine control. 

3. Marine application:-Turbine speed sensors.
4. Medical application: - Artificial heart and lung ventilators.


Home About-us Computer Science Electronics Mechanical Electrical IT Civil
Copyright © 2018 | All Rights Reserved. Design By Templateclue