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((short description|Electronic sensors that convert light into electrical signals))
((refimprove|date=January 2016))
'''Electro-optical sensors''' are electronic detectors that convert [[light]], or a change in light, into an electronic signal. These sensors are able to detect electromagnetic radiation from the infrared up to the ultraviolet wavelengths.<ref>((cite book |last1= Peixoto |first1= A.C. |last2= Silva |first2= A.F. |date=2017 |chapter=Smart devices: Micro- and nanosensors |title=Bioinspired Materials for Medical Applications|location=Braga, Portugal |publisher=Elsevier Ltd. |pages=297–329 |isbn=978-0-08-100741-9))</ref> They are used in many industrial and consumer applications, for example:
* [[Light fixture|Lamps]] that turn on automatically in response to darkness
* [[Position sensor]]s that activate when an object interrupts a light beam
* Flash detection, to synchronize one [[photographic flash]] to another
* [[Photoelectric sensor]]s that detect the distance, absence, or presence of an object

== Function == 
An optical sensor converts light rays into electronic signals. It measures the physical quantity of light and then translates it into a form readable by an instrument. An optical sensor is generally part of a larger system that integrates a source of light, a measuring device, and the optical sensor. This is often connected to an electrical trigger. The trigger reacts to a change in the signal within the light sensor. An optical sensor can measure the changes from one or several light beams. When a change occurs, the light sensor operates as a photoelectric trigger and therefore either increases or decreases the electrical output.
An optical switch enables signals in optical fibers or [[integrated optical circuit]]s to be switched selectively between circuits. An optical switch can operate by mechanical means or by electro-optic effects, magneto-optic effects, and other methods.

== Types of optical sensors and switches ==
There are many different kinds of optical sensors, the most common types are:<ref>((cite book |last1=Morris |first1=Alan S. |last2=Langari |first2=Reza |date=2012 |title=Measurement and Instrumentation |location=London, UK |publisher=Elsevier Inc. |page=325 |isbn=978-0-12-381960-4))</ref>
* [[Photoresistor|Photoconductive devices]] convert a change of incident light into a change of resistance.
* [[Photovoltaics]], commonly known as solar cells, convert an amount of incident light into an output voltage.
* [[Photodiodes]] convert an amount of incident light into an output current.
* [[Phototransistors]] are a type of [[bipolar transistor]] where the base-collector junction is exposed to light. This results in the same behaviour of a photodiode, but with an internal gain.

[[Optical Switches]] are usually used in [[optical fibers]], where the [[electro-optic effect]] is used to switch one circuit to another. These switches can be implemented with, for example,  [[microelectromechanical systems]] or [[piezoelectric]] systems.

== Applications ==
[[File:Optical sensor.png|thumb|right|Optical heart-rate sensor]]
Electro-optical sensors are used whenever light needs to be converted to energy. Because of this, electro-optical sensors can be seen almost anywhere. Common applications are [[smartphones]] where sensors are used to adjust screen brightness, and [[smartwatches]] in which sensors are used to measure the wearer's heartbeat.

Optical sensors can be found in the energy field to monitor structures that generate, produce, distribute, and convert electrical power. The distributed and nonconductive nature of optical fibres makes optical sensors perfect for oil and gas applications, including pipeline monitoring. They can also be found in wind turbine blade monitoring, offshore platform monitoring, power line monitoring and downhole monitoring. Other applications include the civil and transportation fields such as bridge, airport landing strip, dam, railway, airplane, wing, fuel tank and ship hull monitoring.

Among other applications, optical switches can be found in thermal methods which vary the refraction index in one leg of an interferometer in order to switch the signal, MEMS approaches involving arrays of micromirrors that can deflect an optical signal to the appropriate receiver, piezoelectric beam steering liquid crystals which rotate polarized light depending on the applied electric field and acousto-optic methods which change the refraction index as a result of strain induced by an acoustic field to deflect light.

Another important application of optical sensor is to measure the [[concentration]] of different compounds by both visible and [[infrared spectroscopy]].

==See also==
*[[Imaging sensor]]

==References==
((reflist|30em))
[[Category:Sensors]]
[[Category:Optoelectronics]]
[[Category:Nonlinear optics]]

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