Laser & Optoelectronics Progress, Volume. 62, Issue 5, 0506006(2025)

A Metal Strain Rosette Sensor Using Ultra-Weak Fiber Bragg Grating

Zhihui Luo1,2、*, Jie Gao1, Shaohua Deng3, Xiaolong Wang1, and Yunrui He1
Author Affiliations
  • 1College of Mathematics and Physics, College of Nuclear Energy Science and Engineering, China Three Gorges University, Yichang 443002, Hubei , China
  • 2Hubei Engineering Research Center of Weak Magnetic-Field Detection, China Three Gorges University, Yichang 443002, Hubei , China
  • 3College of Mechanical & Power Engineering, China Three Gorges University, Yichang 443002, Hubei , China
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    Figures & Tables(20)
    Three-way strain rosette structures of UW-FBG fiber. (a) Equilateral triangle; (b) right triangle
    Simulation of metal strain rosette substrate. (a) Schematic diagram of force; (b) simulated result
    Deformations of different substrate models. Variation in deformations of (a) XY groove, and (b) XZ groove with groove depth when substrate thickness is 1.0 mm,and length of triangle side is 16 mm; variation in deformations of (c) XY groove, and (d) XZ groove with substrate thickness when groove depth is 0.5 mm, and length of triangle side is 16 mm; variation in deformations of (e) XY groove, and (f) XZ groove with length of triangle side when substrate thickness is 1.0 mm, and groove depth is 0.5 mm
    Multi-factor histogram of deformation for different models. (a) Deformation of bottom; (b) deformation of side
    Dimension of metal strain rosette substrate
    UW-FBG metal strain rosette sensor. (a) Overall structure of sensor; (b) schematic diagram of welding
    Designed simulation of different spot welding methods
    Forcing experiment system of strain rosette sensor
    Fitted curves of load and wavelength shift in OAB direction. (a) Test 1; (b) test 2; (c) test 3
    Fitted curves of load and wavelength shift in XYZ direction. (a) Test 1; (b) test 2; (c) test 3
    Tensile experiment system of strain rosette sensor
    Fitted curves of load and wavelength shift in tensile experiments. (a) Test 1; (b) test 2; (c) test 3
    Fitted curves of temperature and wavelength for strain rosette sensor
    Physical drawing of model test
    Fitted curves of load for different devices and wavelength shift or strain. (a) Fitted curves of load for strain rosette sensor and wavelength shift; (b) fitted curves of load for strain gauge and strain; (c) fitted curves of load for optic cable and wavelength shift
    • Table 1. Designed substrate models

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      Table 1. Designed substrate models

      Substrate modelGroove depthSubstrate thicknessLength of triangle side
      10.21.016
      20.51.016
      30.81.016
      41.01.016
      51.21.016
      60.51.016
      70.51.216
      80.51.416
      90.51.616
      100.51.816
      110.51.012
      120.51.013
      130.51.014
      140.51.015
      150.51.016
    • Table 2. Simulation results of 6 types for spot welding methods

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      Table 2. Simulation results of 6 types for spot welding methods

      Length of extented area /mmGroove strain /μεPrincipal strain /μεEfficiency /%
      ABACBCCalculatedSimulation
      11-284.005.00-7.00-284.13-352.0081
      12-289.0013.00-9.00-289.42-350.0083
      13-293.00-1.80-12.00-293.09-347.0084
      14-301.00-5.00-15.00-301.09-345.0087
      15-308.00-9.00-19.00-308.08-343.0090
      16-306.00-13.00-15.00-306.00-340.0090
    • Table 3. Measure results in OAB angular

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      Table 3. Measure results in OAB angular

      Number of testPrincipal strain /μεError of strain /%Principal strain direction /(°)Error of direction /%
      MeasuredCalculatedTheoreticalCalculated
      1-318.00-313.491.4290.0090.600.67
      2-320.00-318.480.4890.0090.530.59
      3-324.00-315.642.5890.0090.660.73
    • Table 4. Measure results in XYZ angular

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      Table 4. Measure results in XYZ angular

      Number of testPrincipal strain /μεError of strain /%Principal strain direction /(°)Error of direction /%
      MeasuredCalculatedTheoreticalCalculated
      1-328.00-321.561.9690.0090.390.43
      2-326.00-320.601.6690.0090.290.32
      3-329.00-321.312.3490.0090.290.32
    • Table 5. Measurement results of tensile experiments

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      Table 5. Measurement results of tensile experiments

      Number of testPrincipal strain /μεError of strain /%Principal strain direction /(°)Error of direction /%
      MeasuredCalculatedTheoreticalCalculated
      1323.00311.193.6690.0090.580.64
      2317.00307.872.8890.0090.660.73
      3320.00310.053.1190.0090.350.39
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    Zhihui Luo, Jie Gao, Shaohua Deng, Xiaolong Wang, Yunrui He. A Metal Strain Rosette Sensor Using Ultra-Weak Fiber Bragg Grating[J]. Laser & Optoelectronics Progress, 2025, 62(5): 0506006

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    Paper Information

    Category: Fiber Optics and Optical Communications

    Received: Jun. 12, 2024

    Accepted: Jul. 29, 2024

    Published Online: Feb. 21, 2025

    The Author Email:

    DOI:10.3788/LOP241468

    CSTR:32186.14.LOP241468

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