Application of compound measuring method with laser and CCD to sphericity error detection of ICF target

A novel compound measuring method for sphericity error detection of ICF target is proposed. Combining the advantages of laser probe and CCD camera, this method can effectively integrate the data captured by laser probe and CCD camera into the same coordinate system by means of calibrating the position relationship of the two optical axes with a standard ball. The quasi-Newton method is employed to process the measured data with the noise data eliminated. Meanwhile, the diameter of target derived by CCD camera is used as partial initial conditions, which prevents the occurrence of local optimization due to inappropriate initial parameter selection. The experiment has been carried out on the experiment platform of a compact five-coordinate measuring machine under two kinds of measuring mode, demonstrating the validity and robustness of this method. (authors)