Title :
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
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;
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
DOI :
10.1109/BIOROB.2008.4762897
