Chaojiang He, Yanlin He, Fei Luo, Lianqing Zhu. Needle shape optical fiber measurement method introducing strain sensitivity matrix[J]. Infrared and Laser Engineering, 2021, 50(12): 20210623
- Infrared and Laser Engineering
- Vol. 50, Issue 12, 20210623 (2021)
Fig. 1. Flowchart of shape reconstruction algorithm
Fig. 2. Schematic of a FBG sensor
Fig. 3. (a) Pure bending model and (b) cross section of the sensing point
Fig. 4. The moving coordinate system of the needle
Fig. 5. Coordinate conversion
Fig. 6. Integrated FBG design of needle for percutaneous intervention
Fig. 7. FBG strain sensitivity calibration system
Fig. 8. Needle optical fiber sensing shape measurement system. (a) PC; (b) Interrogator; (c) Optical fiber; (d) Needle; (e) Location hole;(f) Motion control; (g) Six axis displacement
Fig. 9. Strain sensitivity for encapsulated FBG sensor
Fig. 10. Wavelength shift of three fibers in different positions
Fig. 11. Reconstruction results of needle under different deformation
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Table 1. Wavlength shift of different FBGs before and after integrating needle
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Table 2. Strain sensitivity of FBGs
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Table 3. Deformation measured error analysis of X -axis
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