**7. Conclusion**

A pertinent method to detect the energetic centre of signal generated by optical scanning with a rotating mirror and a simple photodiode was presented. The results of a series of ex‐ periments and simulations were used to analyse the performance of the method and the cir‐ cuit considering regular signals. Consequently, further work is required to reduce problems encountered in processing real signals. Besides, The method can also be used to detect geo‐ metrical centre of the light distribution on CCD and PSD, future experiments with this kind of sensors should be considered. The results suggest that the circuit proposed can support different patterns of light distributions. To conclude, it is strongly recommended that this circuit and the photodiode be manufactured in the same integrated circuit.
