Optical Sensors - Phototransistors are special electronic components that use light as an input source to control the flow of current. These devices are integral parts of numerous technological gadgets and systems around us. The main function of such sensors is to convert light into electrical signals, giving machines the ability to 'see' or detect light. These phototransistors are often used as switches or amplifiers in a range of applications, essentially acting as the 'eyeballs' for many smart systems in our daily life. They function by altering their electrical properties under light exposure, hence triggering desired control in the system.
These sensors are designed for specific applications such as light detection and distance sensing, to more complex roles in fiber optic communication systems, safety equipment, and computer peripheral devices. They are favorable for their rapid response, high sensitivity, and the ability to operate under wider temperature ranges. Some of the major manufacturers of Optical Sensors - Phototransistors include Honeywell, Vishay, Broadcom Limited, and Osram Opto Semiconductors.