US 12,235,138 B2
Optical fiber with microgratings for increased measurable strain range
Mark E. Froggatt, Blacksburg, VA (US); Dawn K. Gifford, Blacksburg, VA (US); and Alexander K. Sang, Blacksburg, VA (US)
Assigned to Intuitive Surgical Operations, Inc., Sunnyvale, CA (US)
Filed by Intuitive Surgical Operations, Inc., Sunnyvale, CA (US)
Filed on Jul. 6, 2023, as Appl. No. 18/348,238.
Application 18/348,238 is a continuation of application No. 16/652,938, granted, now 11,761,797, previously published as PCT/US2018/052161, filed on Sep. 21, 2018.
Claims priority of provisional application 62/646,398, filed on Mar. 22, 2018.
Claims priority of provisional application 62/566,673, filed on Oct. 2, 2017.
Prior Publication US 2023/0349733 A1, Nov. 2, 2023
Int. Cl. G01D 5/353 (2006.01); G02B 6/02 (2006.01)
CPC G01D 5/35316 (2013.01) [G02B 6/02042 (2013.01); G02B 6/02076 (2013.01); G02B 6/02128 (2013.01); G02B 6/022 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical sensor comprising:
an optical fiber including multiple cores;
first microgratings inscribed in the multiple cores at a common first location along a length of the optical fiber; and
second microgratings inscribed in the multiple cores at a common second location along the length of the optical fiber;
wherein each of the first and second microgratings has a grating length of no more than 50 μm.