29-05-2013, 03:19 PM
SIGNAL CONDITIONING
SIGNAL.pptx (Size: 973.82 KB / Downloads: 18)
OBJECTIVES
Meaning of Signal conditioning
Signal conditioning processes
Operational amplifier
Different types of amplifier
Simple control system
References
DEFINATION
Signal conditioning is the operation performed on the signal to convert them to a form suitable for interfacing with other elements in the process control
Any manipulation of the electrical output of a sensor or transducer to improve the quality of the data is called Signal Conditioning
SENSOR
A sensor is a sophisticated transducer in the sense that it contains some signal conditioning circuits capable of amplifying and refining the weak and raw signal that is available at the output of the transducer.
SIGNAL CONDITIONING OPERATIONS
Amplification/Attenuation
Filtering
Converting a resistance to a voltage signal
Converting a current signal to a voltage
Converting a frequency signal to a voltage
Linearization
Combining Signal and Reference
TO GET RIGHT TYPE OF SIGNAL
Converting a resistance to a voltage signal
Converting a current signal to a voltage
Converting a frequency signal to a voltage
Done By wheatston bridge and out of balance voltage
LINEAR VARIABLE DIFFERENTIAL TRANSFORMER
The inductive pick-up type transducers are mainly used for displacement or position measurement. An immediate example of inductive pick-up based transducers is LVDT (Linear Variable Differential Transformer). LVDTs are similar to transformers. The operation uses two transformers sharing a common core and primary winding. The LVDT provides an AC output voltage signal, which is proportional to the displacement of its magnetic core passing through the windings. It has one primary coil, two secondary coils, and a ferrite core.
Analog-to-Digital Converter (ADC)
The inductive pick-up type transducers are mainly used for displacement or position measurement. An immediate example of inductive pick-up based transducers is LVDT (Linear Variable Differential Transformer). LVDTs are similar to transformers. The operation uses two transformers sharing a common core and primary winding. The LVDT provides an AC output voltage signal, which is proportional to the displacement of its magnetic core passing through the windings. It has one primary coil, two secondary coils, and a ferrite core.