Experimental angular sensing of perfect petal beams with a light dependent resistor

Abstract

We further explore the use of perfect petal beams (PPBs) in rotational sensing with light dependent resistors (LDRs) by experimentally generating them and detecting their rotation with an assembled LDR setup. We first reconstruct the PPB with a computer-generated hologram (CGH) and a spatial light modulator (SLM). The LDR circuit's response to a rotating PPB is recorded, and we compare these findings to prior simulations. In designing the experiment, we also identify new factors not encountered previously: generated PPBs possess geometries that differ from the simulated version, significantly affecting the expected response of low order PPBs; also, LDRs exhibit non-linear response to light, to which we adapt by applying a correction to the simulated visibility. Our results show that the laboratory setup's response to PPBs validates the simulation's − visibility trends and optimal sizes were correctly predicted, with the exception for l = 1. We also confirm that PPBs significantly improve both signal quality and control of LDR angular sensing, even for higher orders, effectively surpassing regular petal beams as previously claimed.