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How do these transducers work?
To convert physical movement to electrical signals, some devices make use of variable resistors. Any movement will cause a slider contact to change position against a resistance wire causing a change in electrical current or voltage. Other devices may make use of movement to alter position of an induction coil relative to magnetic core, causing a change in induced current in circuit. Others may make use of movement to change air gap between two capacitance plates, causing a change in current in circuit.
In case of loudspeaker, opposite effect takes place. Electrical signals are converted to movement.
Some pneumatic transducers make use of changing air signals to cause a corresponding mechanical movement in flapper and linkages. This movement is then converted to electrical signals by methods above. So it takes 3 steps of conversion before we can get electrical signal.
Once electrical signal is obtained, it can be used to compare to set value in controller, and a whole control system can be designed from it.
Well folks, get your signals and be in control!
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