A system and method for motion detection, useful, for example, in intrusion detection, access control, and energy management, including an incoherent detector, including at least one sensing element, operative to detect receipt of radiation having a wavelength between 0.05 mm and 10 mm from multiple fields of view, and a motion detector receiving an output of the incoherent detector and providing a motion detection output indicating receipt of radiation from an object moving between the multiple fields of view.