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The liquids which can be detected by a capacitor sensor are oil, paint, water, etc. A capacitive sensor works like a normal capacitor. In this sensor, a metal plate within the sensing face is electrically connected to an oscillator circuit and the target which is detected can act as the next plate of the capacitor.
The detection range of a capacitive sensor is from 2 to 50mm. The detection range of an inductive sensor is from 0.8 to 100mm. We know that a capacitive sensor simply detects capacities changes within the surroundings. This sensor responds to different materials which contain certain conductivity like metals & liquids.
Generally, a capacitor sensor is one type of proximity sensor used to detect nearby objects through their electrical field effect formed through the sensor. These types of sensors have some similarities with radar in their capacity to sense conductive materials while observing through insulating materials like plastic or wood.
Thus, the oscillator circuit begins oscillating and alters the output condition of the capacitive sensor once it attains a certain amplitude. When the object leaves the sensor, the amplitude of the oscillator will be reduced by switching the capacitive sensor back to its early condition.
In order to detect an object through an inductive sensor, the object must be conductive. These sensors are used to detect both metals & non-conductive materials. This sensor is used to detect metal objects. The working of capacitive sensors is, it measures changes within an electrical property known as capacitance.
‘h’ is the gap width between two capacitor plates. The capacitive proximity sensor has an HF oscillator with a sensing surface that is shaped by two metal electrodes. Whenever a target approaches the sensing surface, then it penetrates the electrode’s electrostatic field & alters the oscillator’s capacitance.
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Capacitive Sensor Working Principle The capacitive proximity sensor has an HF oscillator with a sensing surface that is shaped by two metal electrodes. Whenever a target approaches the sensing surface, then it …
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The capacitor array consists of a series of rhythmic changes in capacitance between the drive signal and the detection signal designed to achieve compensation in a certain variable step.
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capacitor. When an object nears the sensing surface it enters the electrostatic field of the electrodes and changes the capacitance in an oscillator circuit. As a result, the oscillator …
This document describes a cell phone detector circuit that uses a CA3130 IC and 0.22 μF capacitor to sense radio frequency signals from activated cell phones within 1.5 meters. When the circuit detects an RF signal, …
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