High-precision MRI-compatible force sensor with parallel plate structure

Author

Tokuno, Takashi ; Tada, Mitsunori ; Umeda, Kazunori

Author_Institution

Sch. of Sci. & Eng., Chuo Univ., Tokyo

fYear

2008

fDate

19-22 Oct. 2008

Firstpage

33

Lastpage

38

Abstract

This paper presents an MRI-compatible optical force sensor: its principle, structure and performance. Our force sensor employs an optical micrometry based on differential measure of light intensity. This technology enables highly accurate and sensitive two degrees-of-freedom displacement sensing by using a point source, a photo detector and an optical lens. The developed force sensor achieves MRI compatibility by placing all the electric and metallic components outside MRI, and connecting the light path between the optical components by using multi-core optical fibers. The sensor head component has parallel plate structure and is made of glass fiber reinforced poly-ether-ether-keton those help reducing axial interference and hysteresis characteristics of plastic resin. The accuracy of this force sensor is better than 1.6 %F.S. under the applied force ranging from 0 to 3 N.

Keywords

biomedical MRI; biomedical equipment; displacement measurement; force measurement; optical sensors; 2 degrees-of-freedom displacement sensing; MRI-compatible optical force sensor; glass fiber reinforced poly-ether-ether-keton; light intensity; multicore optical fibers; optical lens; optical micrometry; parallel plate structure; photodetector; point source; sensor head; Force measurement; Force sensors; Joining processes; Lenses; Magnetic resonance imaging; Optical detectors; Optical devices; Optical fibers; Optical sensors; Sensor phenomena and characterization;

fLanguage

English

Publisher

ieee

Conference_Titel

Biomedical Robotics and Biomechatronics, 2008. BioRob 2008. 2nd IEEE RAS & EMBS International Conference on

Conference_Location

Scottsdale, AZ

Print_ISBN

978-1-4244-2882-3

Electronic_ISBN

978-1-4244-2883-0

Type

conf

DOI

10.1109/BIOROB.2008.4762897

Filename

4762897