In 2017 an American company involved in the production of topographic surveying systems, commissioned an electro-optical system for the analysis of building structures such as bridges and buildings. On their specifications, we made an optical sensor for the detection of a laser beam placed at great distances. Since they are relative centimetric movements and it was coming from very distant structures, it is easy to understand how the center of the laser beam needed to be detected with high sensitivity to acquire the real movement of the transmitter. We have therefore created an array of RX-diodes and have appropriately conditioned the signal with the use of Op-amps and active filters. The resulting signals would then be entrusted to an A/D acquisition board for subsequent processing in real time.
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