The diode laser energy delivered into small to median hemorrhoidal piles caused little pain and led to a partial to complete resolution within a short time compared to open hemorrhoidectomy. Some adjustments must be made to prevent burning lesions and residual plicoma. Although it is not a good method for big piles, this technique opens new possibilities for surgical treatment of hemorrhoidal disease.
This paper deals with the optimization of Laser Diode Self Mixing Sensors for velocity measurements when self-mixing signals are corrupted by the speckle phenomenon, a process of a random nature due to the surface roughness of the moving target. A new behavioral model is presented and used to design and compare real time and optimal signal processing algorithms for Doppler frequency estimations. Finally, experimental results, obtained in the context of automotive applications, validate the proposed model in measuring car velocities.
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