Infrared and Laser Engineering, Volume. 50, Issue 12, 20210623(2021)
Needle shape optical fiber measurement method introducing strain sensitivity matrix
Figures & Tables(14)
Fig. 3. (a) Pure bending model and (b) cross section of the sensing point
Fig. 6. Integrated FBG design of needle for percutaneous intervention
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. 11. Reconstruction results of needle under different deformation
Table 1. Wavlength shift of different FBGs before and after integrating needle
View tableView in ArticleTable 1. Wavlength shift of different FBGs before and after integrating needle
Fiber FBG Wavelength before embedded/nm Wavelength after embedded/nm a 1 1525.8163 1525.7967 2 1529.6933 1529.6742 3 1533.7671 1533.7475 4 1538.1146 1538.1146 b 1 1525.7575 1525.7575 2 1529.8308 1529.8308 3 1533.9042 1533.9042 4 1537.8208 1537.8013 c 1 1525.9753 1525.9925 2 1529.9092 1529.9092 3 1533.7671 1533.7867 4 1537.8600 1537.8600
Table 2. Strain sensitivity of FBGs
View tableView in ArticleTable 2. Strain sensitivity of FBGs
Fiber FBG FBG strain sensitivity/ $\mathrm{p}\mathrm{m}\cdot {\mathrm{{\text{µ}} }\mathrm{\varepsilon } }^{-1}$ FBG strain sensitivity after embedded/ $\mathrm{p}\mathrm{m}\cdot {\mathrm{{\text{µ}} }\mathrm{\varepsilon } }^{-1}$ a 1 1.11 0.44 2 1.12 0.79 3 1.12 0.84 4 1.12 0.84 b 1 1.13 0.56 2 1.15 0.81 3 1.14 0.83 4 1.15 0.84 c 1 1.13 0.38 2 1.14 0.77 3 1.14 0.79 4 1.15 0.78
Table 3. Deformation measured error analysis of
X -axisView tableView in ArticleTable 3. Deformation measured error analysis of
X -axisDeformation theoretical value/mm −3 −6 −9 −12 −15 Shape reconstruction without sensitivity matrix/mm −2.181 −5.920 −10.684 −14.498 −18.918 Absolute error/mm 0.819 0.08 1.684 2.498 3.918 Relative error 5.46% 0.53% 11.23% 16.65% 26.12% Shape reconstruction with sensitivity matrix/mm −2.896 −5.667 −8.538 −11.425 −14.399 Absolute error/mm 0.104 0.333 0.462 0.575 0.601 Relative error 0.69% 2.22% 3.08% 3.83% 4.01%
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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
Paper Information
Category: Photoelectric measurement
Received: Aug. 30, 2021
Accepted: --
Published Online: Feb. 9, 2022
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