Quadrant diode
A quadrant diode , also quadrant photodiode , or quadrant photodiode are in optoelectronics a form of segmented photodiodes in which four photodiodes are arranged in a square. The sensitive surfaces are close together so that there is only a narrow, cross-shaped gap between them.
use
Quadrant diodes are mainly used to position a laser beam as precisely as possible or to determine its position. For this purpose, the laser beam is directed onto the diode and the current of the photodiodes is compared. The ratio of the currents of the individual photodiodes can be used to make a statement about the area occupied by each individual diode and thereby determine the position of a round beam. Alternatively, the current difference between the diodes can be regulated to zero using a drive (e.g. piezo stacks ), thereby positioning a laser beam.
credentials
- ↑ Data sheet (PDF; 64 kB) of a QPD, type JQ50P