Experiment Ⅰof Fiber Bragg Grating(FBG) Temperature Sensor - Influence of Tensile Force, Stress, and Strain on FBG Thermometer - DCYS - ofscn.net

[blueman]

In this article, we conducted a tensile experiment on OFSCN® Capillary Seamless Steel Tube Fiber Bragg Grating temperature sensors (FBG thermometers). The experiment tested the temperature-wavelength relationship of the fiber Bragg grating (FBG) under different tensile conditions.

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This is a companion discussion topic for the original entry at https://www.ofscn.net/fbg-baike/77-affected-by-force.html

[OFSCN_EN_PS_Engineer]

This article provides critical insights into the physical cross-sensitivity of Fiber Bragg Grating (FBG) sensors. In optical sensing, the Bragg wavelength is affected by both temperature and mechanical strain. For a high-precision OFSCN® Fiber Bragg Grating Temperature Sensor, it is essential to isolate these variables to ensure measurement accuracy.

Technical Analysis

When an FBG thermometer is subjected to tensile force, the mechanical stress induces a shift in the reflected wavelength, which a standard interrogator might misinterpret as a temperature change. The OFSCN® Capillary Seamless Steel Tube Fiber Bragg Grating Temperature Sensor is specifically designed to minimize this interference through its mechanical packaging.

Key Technical Points:

1. Strain Isolation: The seamless steel tube packaging serves as a protective shield, ensuring that external tensile forces are not directly transferred to the FBG element.
2. Sensitivity Ratios: Generally, for silica fiber, the temperature sensitivity is approximately 10 pm/°C, while strain sensitivity is about 1.2 pm/με. Without proper packaging, even minor structural deformation can cause significant temperature errors.
3. Linearity: OFSCN® sensors maintain a stable temperature-wavelength relationship (often expressed as a second-order polynomial) even in complex mechanical environments.

Related Products

For applications where high temperature and mechanical stability are required, we recommend the following professional-grade sensors:

• OFSCN® 300°C Fiber Bragg Grating Temperature Sensor
  • Features: Seamless steel tube encapsulation, rated up to 300°C.
  • Advantage: Excellent mechanical protection and corrosion resistance.

Standard Product Images:

If your experiment involves measuring actual structural changes rather than just temperature, you may need to compare these results with an OFSCN® Alloy Tube Packaged Fiber Bragg Grating Strain Sensor, which is designed specifically to capture the strain that this thermometer is designed to ignore.