An optimization measurement method of laser sensor based on perspective projection model

Perspective projection model is the common measurement method for laser sensor to calculate the 3D coordinates of spatial points. However, the error of mathematical model is introduced, which inevitably decrease the measurement accuracy of laser sensor. In order to improve the accuracy, an optimization measurement method is proposed in this paper. Firstly, the structural design and measurement principle of laser sensor is developed. Secondly, the error propagation model is established, and the effect of the structural parameters in perspective projection model is probed in detail. Next, an optimization measurement method is presented by adjusting the structural parameters, which is the projection angle of laser beam in measurement coordinate system. Finally, the effectiveness of the proposed optimization method is evaluated by the simulative and practical experiments. The experiment results show that the maximum error can be reduced to 0.589 mm with optimization from 1.090 mm of previous method. Enough theoretical research is offered for optimization design of measurement model of the laser sensor. •The error propagation model of measurement method of laser sensor based on perspective projection model is established.•The optimum structural parameters selection criteria are proposed.•Structural parameters optimization is an effective strategy to improve measurement accuracy of laser sensor.