Patent ID: 9671489
Date: 2017-06-06
CPC Classifications: G01S,H01L

Claim:
1. An electromagnetic sensor of an optical detection system, comprising: a Fresnel lens, an array of photodetectors having a pixel pitch from about 150 μm to 210 μm enabling an angular coverage of up to 360°, the Fresnel lens coupled at an aperture of the array, the Fresnel lens adapted to collect incident optical signals and focus same onto the array, the array adapted to convert the optical signals into electrical outputs, the electrical outputs analyzed by the optical detection system to determine, for each optical signal, an incident angle of arrival of thereof, a range of a source of the optical signal to the sensor that is determined from the calculated angle of arrival, the electrical outputs further analyzed to minimize a false alarm rate by discriminating each optical signal spectrally to calculate a wavelength thereof, so as to distinguish whether an incident optical signal is from a narrowband laser source operating at a single wavelength or from a broadband light source operating at a continuum of wavelengths.