US 12,174,322 B2
F-P sensor probe, absolute distance measurement device, and absolute distance measurement method
Xiangang Luo, Sichuan (CN); Tiancheng Gong, Sichuan (CN); Chengwei Zhao, Sichuan (CN); Yanqin Wang, Sichuan (CN); Guiyuan Jia, Sichuan (CN); Yanwu Chu, Sichuan (CN); and Changtao Wang, Sichuan (CN)
Assigned to THE INSTITUTE OF OPTICS AND ELECTRONICS, THE CHINESE ACADEMY OF SCIENCES, Sichuan (CN)
Appl. No. 18/575,779
Filed by THE INSTITUTE OF OPTICS AND ELECTRONICS, THE CHINESE ACADEMY OF SCIENCES, Sichuan (CN)
PCT Filed Dec. 5, 2022, PCT No. PCT/CN2022/136612
§ 371(c)(1), (2) Date Dec. 29, 2023,
PCT Pub. No. WO2024/113394, PCT Pub. Date Jun. 6, 2024.
Claims priority of application No. 202211534663.2 (CN), filed on Dec. 1, 2022.
Prior Publication US 2024/0264285 A1, Aug. 8, 2024
Int. Cl. G01C 3/08 (2006.01); G01S 7/481 (2006.01); G01S 17/08 (2006.01)
CPC G01S 7/4818 (2013.01) [G01S 17/08 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An F-P sensor probe, comprising a first N+1-core multimode optical fiber probe, an optical fiber sleeve, an imaging lens group, and a reference lens, wherein:
the first N+1-core multimode optical fiber probe, the imaging lens group, and the reference lens are sequentially fixed inside the optical fiber sleeve along a direction of the F-P sensor probe toward a sample; and
the first N+1-core multimode optical fiber probe comprises N first multimode optical fibers and one second multimode optical fiber, where N≥2, and the N first multimode optical fibers are arranged around the second multimode optical fiber;
wherein when a surface of the sample has a reflectivity greater than or equal to 40%, the F-P sensor probe further comprises a film layer inside a window, and the film layer inside the window is attached to a surface of the reference lens.