Fiber grating encoders and methods for fabricating the same

Details Fiber grating encoders and methods for fabricating the same Fiber grating encoders and methods for fabricating the same

1998-05-19

2000-07-11

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, H01J 314, F01D 534

Patent

active

060876557

ABSTRACT:
Very long linear large diameter rotational, and arbitrary shape conformal fiber encoders are suggested. These devices are based on detection of non-zeroth diffraction order or interference pattern of selected diffraction orders from the fiber grating. Relative and absolute position detection or movement detection can be realized. Depending on the variety of disclosed configurations of fiber encoders, fiber grating could be either a fiber Bragg grating (refractive index modulation grating), a fiber surface-relief phase grating, or fiber amplitude or amplitude phase grating. Each of these fiber gratings may have a uniform or chirped period, and the fiber grating encoders may be implemented using transmission, reflection, or Bragg angle reflection schemes. An optical fiber may be manufactured on a continuous basis by drawing it from preform. Consequently, there is really no limitation to the length of the linear fiber based encoders. In addition, since fiber grating can be mounted on a circularly symmetric figure of arbitrary diameter, there is therefore no limitation on the manufacturable size of a rotary encoder. Due to flexibility of fibers, the proposed gratings can be mounted on a surface of arbitrary shape, thereby enabling optical motion encoders to be fabricated for conformal surfaces. Some manufacturing techniques are disclosed.

REFERENCES:
patent: 5760391 (1998-06-01), Narendran
patent: 5869835 (1999-02-01), Udd
patent: 5892582 (1999-04-01), Bao

Affiliated with

Also associated with

Rating

Fiber grating encoders and methods for fabricating the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fiber grating encoders and methods for fabricating the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fiber grating encoders and methods for fabricating the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-544274