| 摘要 |
PURPOSE:To measure the cross level of rails readily and highly accurately by a simple, compact constitution, by performing differential amplification and the like of the output from a level detector in correspondence with the cross level and cant of the rails and the output of a zero point adjuster, and digitally displaying the result. CONSTITUTION:A detecting bar 17 is placed on the rails by bottom plates 12 and 13 which are mounted on the rails. A pendulum and the like provided in the detecting bar 17 are used in a level detector 18. The level detector 18 outputs an electric signal corresponding to the cross level and the cant of the rails. The signals are supplied to a display box 11 through a receptacle 19 and plug 34. Said output is differentially processed by a differential amplifier, which is provided with an LPF and the like that remove a noise component caused by vibration and the like, together with the output of the detector 18 when the level is made to be zero by a zero point adjuster in the box 11. The A/D conversion of the level output, whose zero point is adjusted, is performed, and the result is displayed by a liquid crystal display 26 and the like. Thus the cross level measurement of the rails can be performed readily and highly accurately by a simple, compact constitution wherein bubbles and the like are not used. |
