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Primary and Secondary Transducers
Primary transducers work on the principle of an input sensor detecting or sensing immeasurable data, such as mass, heat, depth and density. It then converts the received energy signal into readable information, usually controlled by an on/off switch. Examples of primary transducers include thermistors and thermocouples. Secondary transducers are best exemplified by reluctive accelerometers and piezoelectric transducers. These types of transducers define how mechanical displacement produces electric signals.
Passive and Active Transducers
Passive and active transducers are classified based on the type of power source they have. Passive transducers rely on producing power output from palpable mechanisms, such as external power. Examples of this type include capacitive, inductive and resistive transformers. On the other hand, active transducers source their power from physical loads and then produce their own voltage and current outputs. Active transducers include thermocouples, piezoelectric crystals and photovoltaic cells.
Analog and Digital Transducers
Analog transducers transmit a readable continuous analog reading of whatever input it receives. Typical of this type of transducer are the thermistor and strain gauge. In contrast, digital transducers create non-continuous pulses which are naturally disjoined. Common examples are laser beam instruments and vortex flowmeters.
Linear Displacement and Rotary Displacement Transducers
Linear displacement transducers produce electrical signal outputs directly proportional to what their sensor detects. This type of transducer exhibits constancy, dependability and sensitivity. On the other hand, rotary displacement transducers measure shaft settings using non-contact capacitance (measurement of energy). Optical rotary and magnetic rotary position sensors are examples of this type.