Optics and Precision Engineering, Volume. 33, Issue 10, 1534(2025)
Monitoring of blood temperature and acoustic impedance based on forward stimulated brillouin scattering in aluminum coated optical fibers
Figures & Tables(13)
Fig. 1. Schematic diagram of the aluminum-coated single-mode fiber
Fig. 2. Schematic diagram of the simulation experimental setup for measuring FSBS spectrum
Fig. 3. Variation of （a） frequency and （b） Linewidth of R0，
Fig. 4. FSBS spectrum of normal blood for three fibers with different coating thickness
Fig. 5. Variation of the sensitivity with the coating thickness for R0，7， R0，8 and R0，9 modes
Fig. 6. Variation of （a） the frequency and linewidth of R0，8 mode with temperature and （c） the acoustic impedance for coating thickness of 3 µm； （b） frequency-temperature vs linewidth-temperature sensitivity； （d） frequency-acoustic impedance vs linewidth-acoustic impedance sensitivity
Fig. 7. Variation of （a） the frequency and linewidth of R0，8 mode with temperature and （c） the acoustic impedance for coating thickness of 5 µm； （b） frequency-temperature vs linewidth-temperature sensitivity； （d） frequency-acoustic impedance vs linewidth-acoustic impedance sensitivity
Fig. 8. FSBS spectrum of R0，8 Mode for the fibers with coating thickness of （a） 3 µm and （b） 5 µm for different states
Fig. 9. Sensitivity of the R0，8 mode to temperature and acoustic impedance：（a， c） Frequency-temperature and linewidth-temperature responses for 3.5 µm and 2.5 µm coatings， respectively；（b， d） Frequency-acoustic impedance and linewidth-acoustic impedance responses for 3.5 µm and 2.5 µm coatings， respectively
Fig. 10. Sensitivity of the R0，8 mode to temperature and acoustic impedance：（a， c） Frequency-temperature and linewidth-temperature responses for 5.5 µm and 4.5 µm coatings， respectively；（b， d） Frequency-acoustic impedance and linewidth-acoustic impedance responses for 5.5 µm and 4.5 µm coatings， respectively
Table 1. Material properties of SiO2 and Al
View tableView in ArticleTable 1. Material properties of SiO2 and Al
C11（SiO2） C44（SiO2） C11（Al） C44（Al） C（0）/GPa 77.99 30.74 114.21 31.61 s/GPa 6.45 2.24 10.11 2.56 θE/K 420 497 258.4 168
Table 2. Sensitivity coefficients for coating thicknesses of （3±0.5）µm and （5±0.5）µm
View tableView in ArticleTable 2. Sensitivity coefficients for coating thicknesses of （3±0.5）µm and （5±0.5）µm
涂层厚度/µm Cν-T/（kHz·℃-1） CΓ-T/（kHz·℃-1） Cν-Z/［kHz/（kg·mm-2·s）］ Cν-Z/［MHz/（kg·mm-2·s）］ 3 49.86 0.108 20.74 3.90 2.5 49.66 -0.188 -41.74 3.78 3.5 50.17 0.239 -3.01 3.59 5 51.44 0.121 16.19 2.35 4.5 51.04 0.026 -20.28 2.66 5.5 51.58 -0.243 -9.70 2.16
Table 3. Frequency and linewidth differences of r0，8 mode in normal vs. hyperproteinemic blood for coating thicknesses of （3±0.5）µm and （5±0.5）µm； retrieved temperature and acoustic impedance of hyperproteinemic blood
View tableView in ArticleTable 3. Frequency and linewidth differences of r0，8 mode in normal vs. hyperproteinemic blood for coating thicknesses of （3±0.5）µm and （5±0.5）µm； retrieved temperature and acoustic impedance of hyperproteinemic blood
涂层厚度/µm Δν
/kHz
ΔΓ
/MHz
T
/℃
Z/
（kg·mm-²·s）
3 22.99 2.74 37.485 1.615 2.5 20.96 1.71 37.481 1.627 3.5 24.78 3.26 37.497 1.616 5 28.01 2.13 37.508 1.675 4.5 27.38 2.41 37.503 1.644 5.5 24.83 1.96 37.509 1.706
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Shanglin HOU, Hang SHAN, jie DONG, Gang WU, Zuyong YAN. Monitoring of blood temperature and acoustic impedance based on forward stimulated brillouin scattering in aluminum coated optical fibers[J]. Optics and Precision Engineering, 2025, 33(10): 1534
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Received: Feb. 21, 2025
Accepted: --
Published Online: Jul. 23, 2025
The Author Email: Shanglin HOU (houshanglin@vip.163.com)
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