公开(公告)号：US3654480A

公开(公告)日：1972-04-04

申请号：US3654480D

申请日：1970-10-08

Applicant: NAT RES DEV

Inventor： STEPHENSON JOHN MICHAEL

IPC: G01P3/48 ,  G01P3/486 ,  G01P15/16 ,  G01D5/36

CPC classification number: G01P15/165 ,  G01P3/4802 ,  G01P3/486

Abstract: A tachogenerator for measuring the speed of a rotating shaft is described. The tachogenerator has two discs each with spaced peripheral slots; one disc is rotated at a constant speed and the other at the speed to be measured. A light beam is projected through the slots to a light sensitive device coupled to an electrical filter and a signal indicative of speed is obtained from the filter. Electrical noise in the signal from the light sensitive device is reduced by the filter. A further reduction in noise is obtained by using one or more pairs of light beams, with the beams diametrically opposed with respect to the discs. A light sensitive device is provided for each beam and these devices are coupled to the filter input. Instead the devices may be coupled to means for combining the pulse trains generated, to provide the output signal.

Abstract translation: 描述了用于测量旋转轴的速度的测速发电机。 测速发电机具有两个盘，每个盘具有间隔开的外围槽; 一个盘以恒定速度旋转，另一个以待测速度旋转。 光束通过狭槽投射到耦合到电过滤器的光敏设备，并且从过滤器获得指示速度的信号。 来自光敏装置的信号中的电噪声被滤波器减小。 通过使用一对或多对光束获得噪声的进一步降低，其中光束相对于盘径向相对。 为每个光束提供光敏装置，并且这些装置耦合到滤光器输入端。 相反，器件可以耦合到用于组合产生的脉冲串的装置，以提供输出信号。