公开(公告)号：US5991027A

公开(公告)日：1999-11-23

申请号：US035242

申请日：1998-03-05

Applicant: Alan James Jacobs-Cook

Inventor： Alan James Jacobs-Cook

IPC: G01L9/00 ,  G01B9/02

CPC classification number: G01L9/002

Abstract: A measuring apparatus comprises a sensor having a vibrating beam whose resonant frequency represents a parameter, such as pressure, to be measured. A light guide supplies light from a source to the beam and returns light reflected from the beam and from the end of the guide to an interferometer. The difference in light paths is greater than the coherent length of the light. The interferometer has first and second paths which differ in length by the difference in the light paths plus an odd number of quarter wavelengths of the light.

Abstract translation: 测量装置包括具有振动束的传感器，该振动束的谐振频率表示待测量的诸如压力的参数。 光源将来自光源的光提供给光束，并将从光束反射的光和从引导件的端部返回到干涉仪。 光路的差异大于光的相干长度。 该干涉仪具有长度不同的第一和第二路径，其中光路的差加上光的四分之一波长的奇数。