Inductive sensor

Elements of a simple inductive sensor.
1. Field sensor
2. Oscillator
3. Demodulator
4. Flip-flop
5. Output

An inductive proximity sensor is a type of non-contact electronic proximity sensor that is used to detect the position of metal objects. The sensing range of an inductive switch is dependent on the type of metal being detected. Ferrous metals, such as iron and steel, allow for a longer sensing range, while nonferrous metals, such as aluminum and copper, can reduce the sensing range by up to 60 percent.[1] Since the output of an inductive sensor has two possible states, an inductive sensor is sometimes referred to as an inductive proximity switch.[1][2]

The sensor consists of an induction loop. Electric current generates a magnetic field, which collapses generating a current that falls toward zero from its initial trans when the input electricity ceases. The inductance of the loop changes according to the material inside it and since metals are much more effective inductors than other materials the presence of metal increases the current flowing through the loop. This change can be detected by sensing circuitry, which can signal to some other device whenever metal is detected.

Common applications of inductive sensors include metal detectors, traffic lights, car washes, and a host of automated industrial processes. Because the sensor does not require physical contact it is particularly useful for applications where access presents challenges or where dirt is prevalent.

See also

References

  1. 1 2 Frank Lamb (2013). Industrial Automation: Hands-On. McGraw-Hill Education. pp. 74–75. ISBN 9780071816458.
  2. ↑ "Inductive sensors". September 1, 2001. Retrieved December 29, 2015.


This article is issued from Wikipedia - version of the Friday, April 08, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.