Abstract Monoclinic Ga 2 O 3 (β-Ga 2 O 3) is a promising material for achieving solar-blind
photodetection because of its unique characteristics, including its high breakdown electric …

Accurately lateral displacement measurement is essential for a vast of non-contact sensing
technologies. Here, we introduce a high-precision lateral displacement measurement …

In this paper, a new response approximation model for quadrant detector is proposed based
on a BP Neural Network by employing different training algorithms. A total of 1001 data …

In this paper, we propose new method to improve the linear measurement range of four-
quadrant detector (4QD) in micro-displacement measuring system. Based combines the …

In free space optical communication, a beacon light loses too much energy after a long-
distance transmission and faces strong interference from background light. The beacon light …

For the laser tracking and positioning system of a moving target using a four-quadrant
detector, the accuracy of laser spot position detection has a serious impact on the tracking …

Due to the high accuracy and fast response, measurement systems based on four-quadrant
detectors (4QDs) are widely used. There is a non-linear relationship between the output …

In atmospheric laser communication, a beam is transmitted through an atmospheric channel,
and the photocurrent output from a quadrant detector (QD) used as the tracking sensor …

In a free space optical communication system, the beacon light will lose most of its energy
after long-distance transmission, and the background light from the universe will strongly …

In the measurement system based on four-quadrant detector (4-QD), the non-uniform
response and the noise interference can significantly reduce the accuracy of the system. In …