Interferometric Load Sensor and Strain Gage.
Patent, Filed 3 Jul 86, patented 28 Mar 89,
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
Pagination or Media Count:
The invention comprises an interferometric load sensor, or force balance 10 which utilizes etalons 12, 14 to form a reflective cavity 16. A fringe pattern is formed in cavity 16 by light from laser source 26. One of the etalons 14 is mounted to a section 20 that is sensitive to the application of a force 22. Flexing of cantilever 24 due to application of force 22 on section 20 changes the air gap wedge angle between the etalons 12, 14 and thereby shifts the fringe the field formed in cavity 16. The shift in the fringe field is observed by light detectors 30, 32. jes