QSD128

Optical Sensors are widely used in various applications due to their advantages like high accuracy, fast response and good linearity. Among the different types of optical sensors, Phototransistors are the most commonly used optoelectronics devices. The QSD128 is a popular type of phototransistor which is widely employed in various applications.

A phototransistor is an optoelectronic device which has the functionality of both a transistor and a photodiode. When exposed to an incident light radiation, the phototransistor produces a current which is directly proportional to the intensity of the incident light. This current can then be used to detect the light level or for other applications.

The QSD128 phototransistor is a fully isolated photon device with an active area of 128. It is well suited for applications where ultra-fast response times are required. It features a high sensitivity to light in a wide range of wavelengths from 350 nm to 1000 nm. It is also capable of operating in both linear and non-linear modes. Additionally, the QSD128 has the ability to handle high power loads without any thermal management.

Due to its unique features, the QSD128 can be used in a variety of applications such as motion control, proximity sensing, temperature sensing, machine vision, surveillance and fire systems. In motion control, the phototransistor is used to detect the presence of an object and is usually combined with a motor controller to achieve precise positioning. In proximity sensing, the phototransistor is used as a light detector to sense the presence of an object. It can also be used in fire detection systems, where it is combined with a smoke detector. In machine vision, the phototransistor is used to detect objects and is usually used in combination with other sensors to achieve a higher level of accuracy.

The working principle of the QSD128 is based on the induction of photocurrent in reverse biased photoconductive materials. The active area of the phototransistor is designed so that when it is exposed to incident light it produces a photocurrent which is directly proportional to the intensity of the incident light. This photocurrent is then used to produce a voltage across the collector and the emitter of the phototransistor, resulting in a current which is then used for various applications.

In conclusion, the QSD128 phototransistor is a popular optoelectronic device which is used in a variety of applications due to its unique features. Its working principle is based on the induction of photocurrent in reverse biased photoconductive materials, which is further used to detect the presence of an object and to produce a voltage for other applications.