QVA21213

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Optical sensors are classed as active or passive devices based on their output. Passive optical sensors are devices which change their optical characteristics (transmission, absorption, reflectance or fluorescence) in a known and measurable way when exposed to a specific type of electromagnetic radiation. Additionally, passive sensors can detect a wide range of radiation, which can be either incandescent light or very short wavelength radiation. An active optical sensor, such as the QVA21213, outputs an electrical signal in response to an external stimulus such as light or infrared radiation.

The QVA21213 is a slot-type photointerrupter which consists of a phototransistor located in an optical slot. This device utilizes a transistor-output, where the collector is always connected to the LED anode, and the emitter is connected to the phototransistor\'s collector. When light is present, the photoelectric effect forces the electrons are forced to move from the emitter to the collector, thus creating a current.

The manner in which the QVA21213 optically senses its environment is by utilizing phototransistors. Phototransistors are transistors with the base lead connected to the emitter. Thus, when exposed to light, the transistor amplifies the analog input signal received from the emitter and sends it to the collector where the signal is further processed.

The QVA21213 is capable of detecting motion, measuring distances, sensing different levels of light, presence or absence of material, and counting items that pass across its detection area. For example, in a manufacturing process, a line of QVA21213 sensors could be set up to detect if the product passes by them in the proper order and at the correct speed without halting the line. The device is also capable of measuring the speed of rotation of objects, which allows for precision measurement and control.

Furthermore, modern QVA21213s can also be used in safety systems. Their small size and high signal output allows for the detection of hazardous and potentially dangerous obstacles and objects while minimizing the risk of damage. Additionally, these sensors are highly accurate and reliable, which makes them suitable for applications in medical and industrial settings.

The QVA21213 is a small, economical, and robust device designed primarily for industrial, commercial and consumer applications. Its compact design makes it ideal for applications in tight spaces, and its high signal output makes it suitable for use in various motion detection and sensing tasks. Thus, the QVA21213 can be ideally employed for a wide range of applications from providing safety features to automation control.

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