Based on GB/T1184-1996, four form-position tolerance tables are listed on the appendix B. The regularity of distribution for form-position tolerances is deliberately analyzed. This paper describes a formulated method ...Based on GB/T1184-1996, four form-position tolerance tables are listed on the appendix B. The regularity of distribution for form-position tolerances is deliberately analyzed. This paper describes a formulated method for identifying the precision grade, deduces the functional relation formulae between the tolerance and its precision grade, and further confirms the automatic judgement method presented by a practical program on PC computed展开更多
Monolithic multi-freeform optical structures play significant roles in advanced optical systems by simplifying system structures and enhancing optoelectronic performance.However,manufacturing and measurement present s...Monolithic multi-freeform optical structures play significant roles in advanced optical systems by simplifying system structures and enhancing optoelectronic performance.However,manufacturing and measurement present significant challenges,which require the simultaneous assurance of form quality and relative positioning of multiple functional surfaces.Consequently,a deterministic form-position deflectometric measuring method is proposed based on Bayesian multisensor fusion,which effectively overcomes the inherent limitation of deflectometry in absolute positioning.Calibration priors were marginalised in the measurement model to improve fidelity,and a fully probabilistic measurement framework was proposed to eliminate numerical bias in conventional sequential optimisation approaches.Finally,a geometric-constraint-based registration method was developed to evaluate the form-position quality of freeform surfaces.The experimental results demonstrated the measurement accuracy could achieve a level of one hundred nanometres for surface forms and a few microns for surface positions.展开更多
文摘Based on GB/T1184-1996, four form-position tolerance tables are listed on the appendix B. The regularity of distribution for form-position tolerances is deliberately analyzed. This paper describes a formulated method for identifying the precision grade, deduces the functional relation formulae between the tolerance and its precision grade, and further confirms the automatic judgement method presented by a practical program on PC computed
基金supported by the National Natural Science Foundation of China(52475551)the Natural Science Foundation of Shanghai(24ZR1406800)the Dreams Foundation of Jianghuai Advanced Technology Center(2023-ZM01C008).
文摘Monolithic multi-freeform optical structures play significant roles in advanced optical systems by simplifying system structures and enhancing optoelectronic performance.However,manufacturing and measurement present significant challenges,which require the simultaneous assurance of form quality and relative positioning of multiple functional surfaces.Consequently,a deterministic form-position deflectometric measuring method is proposed based on Bayesian multisensor fusion,which effectively overcomes the inherent limitation of deflectometry in absolute positioning.Calibration priors were marginalised in the measurement model to improve fidelity,and a fully probabilistic measurement framework was proposed to eliminate numerical bias in conventional sequential optimisation approaches.Finally,a geometric-constraint-based registration method was developed to evaluate the form-position quality of freeform surfaces.The experimental results demonstrated the measurement accuracy could achieve a level of one hundred nanometres for surface forms and a few microns for surface positions.
