“…41 After a comparison of the different kind of photoelectric sensors such as photodiodes, phototransistors, light-emitting diode (LED) as a receiver, infrared LED's as a receiver, and inclusive the light-dependent resistor (LDR), it has been observed that the use of an LED as a photoelectric sensor, in special those working at the wavelength range of blue light (;427-476 nm), 39,42 it is possible to discriminate the sunlight noise with the support of digital filters, such as finite impulse response (FIR), and the Savitzky-Golay filter, enabling the system to work in hostile environments with lighting contamination. 43 Besides the use of computational techniques based on pattern classification, like linear discriminant analysis (LDA) and linear regression (LR), it is possible to classify the different light sources detected to discriminate those that are not of interest. 44 In a difference to the TVS, this OSS is structured with two optical scanning apertures, instead of one laser positioning and one optical scanning aperture.…”