There are scrapers at both sides of drivingbeam for scraping sundries amassed on rail surface all the while.
驱动架两端表面分别装有刮削板，随时刮扫积聚在导轨表面的杂物。
2
The low-voltage driving circuit is adopted to drive a piezoelectric ceramic phase shifter to shift the phase of the reference beam, so as to make the instrument lighter, smaller and cheaper.
采用低压驱动电路驱动压电陶瓷相移器对参考光束进行相移，从而使仪器质量减轻、体积缩小、成本降低。
3
Intermediate driving way is put forward for the first time and can solve influence of deflection and edge effect come from rail beam on mechanical and electric performance.