| 摘要 |
The invention generally pertains to monitoring of machinery, and, more particularly, measuring instantaneous angular velocity of a shaft. The invention provides a simple, easy to install, inexpensive apparatus and method of using the apparatus to monitor instantaneous (true multiple-per-rev) angular velocity or rotational speed of rotational equipment. The invention accomplishes this by using a tape having alternating reflective and non-reflective areas, the tape bonded to, for instance, a shaft. Markings on the tape define the alternating reflective and non-reflective areas. When a light source is directed at the tape, a reflected beam is created, which is detected by a light sensor. The light sensor thus generates a signal, which is used by a processor to perform calculations including instantaneous angular velocity. As described herein, formulas are presented and designed to avoid the phase shifting properties resulting from the discontinuity at the tape seam (where the ends of the tape meet). The processor further records a time of arrival of the reflected beam such that the time of arrival is combined with the signal to perform the calculations. |
