Manufacturer / Exporter / Supplier / Retailer Of Agrochemical, Inductive Proximity Sensor, PLC Based Control Panel, Process Control Instruments, Variable Frequency Drive VFD, SMPS, optical proximity sensors, Capacitive Proximity Sensors, Inductive Proximity Sensors, sensor alarm, offset printing ma... Read More
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Abhay Dixit
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Detection Principle of Capacitive Proximity Sensors Capacitive Proximity Sensors detect changes in the capacitance between the sensing object and the Sensor. The amount of capacitance varies depending on the size and distance of the sensing object. An ordinary Capacitive Proximity Sensor is similar to a capacitor with two parallel plates, where the capacity of the two plates is detected. One of the plates is the object being measured (with an imaginary ground), and the other is the Sensor's sensing surface. The changes in the capacity generated between these two poles are detected. The objects that can be detected depend on their dielectric constant, but they include resin and water in addition to metals.
A complete optical proximity sensor includes a light source, and a sensor that detects the light. The light source is supplied because it is usually critical that the light be "tailored" for the light sensor system. The light source generates light of a frequency that the light sensor is best able to detect, and that is not likely to be generated by other nearby sources. Infra-red light is used in most optical sensors. To make the light sensing system more foolproof, most optical proximity sensor light sources pulse the infra-red light on and off at a fixed frequency. The light sensor circuit is designed so that light that is not pulsing at this frequency is rejected. Optical proximity generally used to detect all types of object. Advantage of optical sensor is they have long sensing range. Optical sensors are divided into three main sub categories :- Diffuse type : Here infra- red light transmitter and receiver are at one end. When any object enters in its field, light is reflected back and detected by receiver giving output. Retro reflective sensor : Here also both transmitter and receiver are at one end. A reflector is placed in front of sensor. Reflector reflects light and any object that breaks light beam is detected and output is activated. Through beam : Here transmitter and receiver are at opposite end. Any object that breaks light beam is detected and output is activated. Laser optical sensors : These sensor uses laser light instead of infra-red light. These are used to detect small object, distance measurement etc.
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