Advantages of Capacitive sensor | Disadvantages of Capacitive sensor
This page covers advantages and disadvantages of Capacitive sensor. It mentions Capacitive sensor advantages and Capacitive sensor disadvantages.
Definition of Capacitive sensor:
The device used for capacitive sensing is known as capacitive sensor. It is based on principle of capacitive coupling. It can detect and consecutively measure things which are conductive or having dielectric other than air. One example is liquid level sensing where in change in liquid between the two sensors indicate change in dielectric material. This causes variation in capacitance.
Capacitance of two parallel plates with Area ('A') and separated by distance ('d') is expressed as follows.
The major application of capacitive sensor is level sensing as mentioned above.
Refer capacitive sensor basics and working >> for more information.
Advantages of Capacitive sensor
Following are the advantages of Capacitive sensor:
➨It can be used to detect non-metallic targets.
➨It can detect through containers of certain types also.
➨It is simple in construction and adjustable.
➨It can detect dense targets and liquids.
➨It is lower in cost.
➨It has higher sensitivity and can be operational with small magnitude of force.
➨It can be used for the measurement of force, pressure and humidity etc.
➨It has very good resolution (as low as 0.003 mm) and frequency response.
Disadvantages of Capacitive sensor
Following are the disadvantages of Capacitive sensor:
➨It is very much sensitive to changes in environmental conditions such as temperature, humidity etc. This will affect the performance.
➨The measurement of capacitance is hard compare to measurement of resistance.
➨Capacitive proximity sensor are not so accurate compare to inductive sensor type.
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