Gear diagnostic system using zonal laser beam for practical use

We developed a new method for that practical use of gear damage diagnostic system by the laser reflection data without using rotary encoder in Raspberry PI device. A tooth surface is irradiated by zonal laser beam at oblique direction, and then the irradiated laser beam zone scan along the tooth profile by the rotational of gear to generate the scattering data. In previous diagnostic system, the rotary encoder is precise and has higher sampling frequency for detecting gear tooth during variable rotational speed, however, it is costly and bulky working on the conventional desktop PC. This new method uses the four positions from tooth root, tooth tip and two median values of them. By using these four positions, rotational speed can be calculated without using the encoder, meanwhile, the measured data of rotational speed can be converted corresponding to the gear rotation angle. To confirm the feasibility and effect of the new method applied in Raspberry PI and desktop PC respectively, the error value of damage can be calculated and compared by the measurement procedure. Furthermore, to predict the damaged position not only tooth height direction but also tooth trace direction, we grasped the tendency of each the damaged area two dimensionally from the error and deviation of measured data. From this result, we can predict the damaged position two dimensionally using only one sensor.