What is the typical deviation between the measured value and the true physical value?
The accuracy of Fiber Bragg Grating (FBG) sensors, in terms of typical deviation between the measured and true physical value, is highly dependent on the specific sensor type, its design, the operating environment, and the associated interrogation system. However, FBG technology inherently offers several advantages that contribute to its high accuracy and reliability compared to traditional electrical sensors:
- Immunity to Electromagnetic Interference (EMI): FBG sensors are optical in nature, making them immune to EMI. This eliminates electrical noise, which can be a significant source of deviation in electrical sensors, especially in harsh industrial environments. This inherent characteristic allows for more stable and accurate signal acquisition.
- Intrinsic Safety: The optical nature also means no electrical sparks, making them intrinsically safe for hazardous environments. This prevents measurement errors or system failures caused by electrical issues.
- Multiplexing Capability: A single fiber can host multiple FBG sensors, allowing for distributed, simultaneous measurements. The unique spectral response of each FBG ensures distinct, accurate readings from each point without crosstalk.
- Long-term Stability: When properly packaged (e.g., in full metal enclosures for high temperatures), FBG sensors demonstrate excellent long-term stability, reducing drift and maintaining accuracy over extended periods.
For specific deviation values, these are typically determined during the factory calibration of each sensor and are outlined in the product’s technical specifications or datasheets. For instance, our OFSCN® Alloy Tube Packaged Fiber Bragg Grating strain sensor and OFSCN® 300°C Fiber Bragg Grating Temperature Sensor undergo rigorous calibration to ensure precise measurements within their specified operating ranges.
Here is an example image of one of our FBG sensors:
You can find more detailed technical parameters and specifications for our FBG strain sensors and FBG temperature sensors on our international website:
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