Optical sensors perform many functions today.
Optical sensor is a general term for a group of sensors that use various wavelengths of light to perform certain tasks. Some rely on lasers while others use available light to perform their jobs, but all forms of optical sensors can be roughly categorized according to the job they perform.
Photoresistors
Photoresistors, also known as light intensity sensors, do exactly what their name implies: They detect and measure the intensity of light. These sensors are used in science and modern technology in a number of different applications. For instance, intensity sensors are used in the liquid crystal displays on many mobile phones to adjust the screen brightness according the the brightness of the surroundings. They also are used in modern cameras to adjust the exposure of the image.
Proximity Sensors
Proximity sensors read changes in the ambient light environment to detect movement. These sensors have many modern applications. They are used in the hunting industry in trap cameras, which use the sensor to trigger the camera to take a photo of passing animals. They also are used in traffic cameras, using the same principle. Perhaps the most obvious use is in holiday decorations that are triggered when a person approaches.
Photodiodes
Photodiodes are a type of optical sensor that converts light into electric current. This type of sensor can be found in many types of consumer electronics. They are present in remote control sensors on compact discs and other components. Photodiodes also are found in various forms of disc players. Photodiodes are more sensitive than photoresistors, but they are used in many of the same applications.
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