Which detector is described as a Complimentary metal oxide sensor active pixel sensor (CMOS-APS)?

• A. Complimentary metal oxide sensor active pixel sensor (CMOS-APS)
• B. Charge coupled device (CCD)
• C. Complementary metal oxide sensor (CMOS)
• D. Photomultiplier

Answer: (A)

CMOS-APS stands for Complementary metal-oxide-semiconductor active pixel sensor. This describes a CMOS-based detector in which each pixel has its own amplifier and circuitry, allowing direct, fast readout and efficient integration of electronics on the same chip. The option that uses the exact term CMOS-APS matches this description precisely, since it names the detector type as a CMOS with an active pixel sensor architecture.

The other detectors refer to different technologies: a CCD uses charge transfer across the chip to a single readout node, a general CMOS detector may not specify the active pixel design, and a photomultiplier is a light-detection device that isn’t a solid-state imaging sensor.