An algorithm for circular test and improved optical configuration by two-dimensional (2D) laser heterodyne interferometer

Circular test is an important tactic to assess motion accuracy in many fields especiallymachine tool and coordinatemeasuring machine. There are setup errors due to using directly centring of themeasuring instrument for both of contact double ball bar and existed non-contact methods. To solve this problem, an algorithm for circular test using function construction based on matrix operation is proposed, which is not only used for the solution of radial deviation (F) but also should be applied to obtain two other evaluation parameters especially circular hysteresis (H). Furthermore, an improved optical configuration with a single laser is presented based on a 2D laserheterodyneinterferometer. Compared with the existed non-contact method, it has a more pure homogeneity of the laser sources of 2D displacement sensing for advanced metrology. The algorithm and modeling are both illustrated. And error budget is also achieved. At last, to validate them, test experiments for motion paths are implemented based on a gantrymachining center. Contrast test results support the proposal.

Source: Review of Scientific Instruments - September 19, 2016 Category: Physics Authors: Shanzhi Tang, Shengrui Yu, Qingfu Han, Ming Li and Zhao Wang Source Type: research