Definition: Detector is an optoelectronic element that receives light and converts it into electrical signals. In fNIRS, a detector typically refers to a device, such as an avalanche photodiode or a photomultiplier tube that detects the near-infrared light that has passed through the measured tissue.

Alternative definition:

Synonym: Receiver, Sensor

References: National Cancer Institute. National Cancer Institute Thesaurus, 2017. Documentation page available on,,,

Related terms: Sensor, Source, Photomultiplier Tube, Avalanche Photodiode, Photodiode, Photodetector, Silicon Photomultiplier  

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