QRD1113

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QRD1113 is an example of an analog output reflective optical sensor belonging to the broader category of opto-sensors. As the name implies, this type of sensor utilizes reflective optics to detect changes in the light stream being received, with operation based on the analog output produced when the light levels vary. This eliminates the need for an external analog-to-digital converter as the signals are directly output from the sensor.

This analog output optical sensor is used in a variety of applications due to its structural simplicity and ability to accurately sense light levels in the absence of an external converter. A common use is for backscattering light level readings such as in medical and dental applications, including x-ray imaging. The sensor can also be employed in LED and laser beam monitoring for the positioning and guidance of automated systems. Moreover, it can be used for enabling or disabling circuits as a safe measure during manufacturing or maintenance.

QRD1113 is composed of an LED emitting an infrared light and a silicon photodiode receiving it from a reflective element. For this type of sensor, the arrangement of the optical components is crucial as it determines the operating range and response time. The LED fulfills two main roles, providing the signal and acting as an incident light detector. This incident light detector ensures that the sensor operates even when no reflective element is present. Once the signal is received by the photodiode, the analog output directly proportional to the level of light received is generated.

The operating principle of this type of sensor is based on the difference of light levels arriving at the photodiode. When the LED emits an infrared light, the majority of it is directed to the reflective element, from which a portion is returned to the light sensor. As an analog optical sensor, its response curve is linear, so the analog output varies in a proportional manner with changes in the light level received. If the light level is minimal due to the presence of an object, the output signal will decrease; conversely, if the reflective element is absent and the incident light is detected, the output signal will increase. The exact output level is determined by the reflective element, LED and photodiode employed, the angle of the reflective element and the object in front of it, and other such parameters.

QRD1113 is a versatile, cost-effective solution for a wide range of industrial applications, and is becoming increasingly more popular as a sensing element in the fields of health care, control automation, and production monitoring. With a simple structure and the absence of external signal conversion, it is a reliable choice for light detection and beam positioning purposes. Its main advantages are the linear analog output, fast response time, and the range of applications in which it can be employed.

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