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Position-Sensitive Detectors
Frequently Asked Questions
A position-sensitive detector is a detector that can determine the position of incident light within its active area.
There are several types of position-sensitive devices, including position-sensitive photodiodes (PSDs), charge-coupled devices (CCDs), and quadrant photodiodes (QPDs).
Position-sensitive detectors work by measuring the distribution of charge generated by incident light within their active area. This information can be used to determine the position of the light.
The active area of a position-sensitive detector is the region of the device that is sensitive to incident light.
The resolution of a position-sensitive detector is the minimum resolvable distance between two points of incident light. It is typically determined by the size of the active area and the precision of the measurement electronics.
The linearity of a position-sensitive detector refers to how accurately it can determine the position of incident light over a wide range of intensities. A highly linear detector will produce a proportional response to changes in light intensity.
The dynamic range of a position-sensitive detector is the range of incident light intensities over which it can accurately determine position. A detector with a high dynamic range can detect both weak and strong signals.
The spatial resolution of a position-sensitive device is the ability to distinguish between two points of incident light that are very close together. This is typically limited by the size of the active area and the precision of the measurement electronics.
Position-sensitive devices are used in a variety of applications, including microscopy, spectroscopy, and precision alignment. They are particularly useful for measuring small changes in position or alignment over a large field of view.
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