Infrared and Laser Engineering, Volume. 52, Issue 3, 20220505(2023)
Fiber Bragg grating temperature insensitive filter based on bimetal structure
Figures & Tables(12)
Fig. 4. (a) Schematic diagram and (b) physical drawing of temperature insensitive filter
Fig. 6. Fitting curve of the center wavelength of the tested fiber grating filter with temperature
Table 1. Thermal expansion coefficient of common materials
View tableView in ArticleTable 1. Thermal expansion coefficient of common materials
Material Aluminum Brass Iron Invar Quartz Glass Coefficient of thermal expansion/℃ 23.9×10−6 19.00×10−6 12.20×10−6 1.00×10−6 0.55×10−6 4.00×10−6
Table 2. Variation range of
L 1/L 2 with different combinations of metal materialsView tableView in ArticleTable 2. Variation range of
L 1/L 2 with different combinations of metal materialsBimetallic material Relationship between L1/L2 and temperature sensitivity coefficient When ∆Y=0.1 pm/℃, the change of x/mm Brass/Aluminum Y= –5.85913x+45.50557 ±0.01707 Iron/Brass Y= –8.13103x+41.91835 ±0.01229 Iron/Aluminum Y= –13.99016x+53.6366 ±0.00715 Invar/Aluminum Y= –27.38245x+67.02889 ±0.00366 Invar/Brass Y= –21.52332x+55.31064 ±0.00465 Invar/Iron Y= –13.39229x+39.04858 ±0.00747
Table 3. Value range of quantitative corresponding variables
View tableView in ArticleTable 3. Value range of quantitative corresponding variables
Ration/mm The range of variables/mm L1=70 L2=9.013±0.0197 L2=8 L1=62.128±0.136
Table 4. Relationship between
L 1/L 2 and sensitivity coefficientView tableView in ArticleTable 4. Relationship between
L 1/L 2 and sensitivity coefficientL1/L2 The length of L1/mm Temperature sensitivity coefficient/pm·℃−1 7.780 62.240 –0.07846 7.775 62.200 –0.04916 7.766 62.128 0.00005 7.750 62.000 0.09731
Table 5. Filter size parameters
View tableView in ArticleTable 5. Filter size parameters
Parameter Parameter name Numerical value L1/mm Length between fixed points on the base 69, 67.1, 65.35, 62.25 L2/mm Filter fiber grating length 8 $ {\alpha }_{1} $ /℃−1Coefficient of thermal expansion of brass substrate 19×10−6 $ {\alpha }_{2} $ /℃−1Strain transfer beam aluminum thermal expansion coefficient 23.9×10−6
Table 6. Temperature sensitivity coefficient corresponding to different
L 1/L 2View tableView in ArticleTable 6. Temperature sensitivity coefficient corresponding to different
L 1/L 2L1/L2 The length of L1/mm Temperature sensitivity coefficient/pm·℃−1 8.63 69 −2.23 8.39 67.1 0.15 8.17 65.35 1.41 7.78 62.25 2.4
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Jingjing Liao, Lianqing Zhu, Yanming Song, Jingtao Xin, Zheng Lv. Fiber Bragg grating temperature insensitive filter based on bimetal structure[J]. Infrared and Laser Engineering, 2023, 52(3): 20220505
Paper Information
Category: Optical communication and sensing
Received: Jul. 21, 2022
Accepted: --
Published Online: Apr. 12, 2023
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