#sensor__detector__sensing_element  any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it
  supertype:  device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  subtype:  metal_detector__metaldetector  detector that gives a signal when it detects the presence of metal; used to detect the presence of stray bits of metal in food products or to find buried metal
  subtype:  mine_detector  detector consisting of an electromagnetic device; used to locate explosive mines
  subtype:  photoelectric_cell__photoelectriccell__photoconductive_cell__photoconductivecell__photocell__electric_eye__magic_eye__magiceye  a transducer used to detect and measure light and other radiations
     subtype:  selenium_cell  a photoelectric cell that uses a strip of selenium

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