Development of target positioning instrument with multi-channels and large field of view

To implement the high reliability and low power consumption, a small-scale target positioning instrument with multi-channels and a large field of view was developed. The optical, mechanical, electronic, mathematical models were built and a calibrating scheme and the algorithm to distinguish the corresponding channels for the imaging points in target positioning were investigated. First, the surface distribution structure of a lens array was designed according to the requirement of large field of view, a spherical shell substrate for installing lenses was machined, and the whole lenses were imaged on one CMOS. Subsequently, the imaging quality was improved by the designed refractive lens and the drivers of CMOS and USB2.0 were developed. Then, a mathematical model for the designed compound eye system was established, and the system calibration was completed. Finally, by the distinguished algorithm for the channels of their imaging points, the target positioning was completed, and three dimensional contours of a large part was measured based on the designed system. Experimental results indicate that the actual measured error for the target is about 2%, whose viewing angle is covered with 66° on the horizontal plane and 43° on the vertical plane of the compound eye. It can satisfy the system requirements of three dimensional target positioning with a large field of view.