seade, mis muundab fotogalvaanilise efekti abil valgusenergia vahetult elektrienergiaks, device the essential electric characteristics of which are due to the absorption of photons, device which gives an electrical signal in response to visible, infrared, or ultraviolet radiation, seade, mis annab elektrisignaali vastuseks nähtavale, infrapuna- või ultraviolettkiirgusele