Distributed Fiber Optic Sensing: Temperature Compensation of Strain Measurement
Short Summary
This Engineering Note describes some methods that can be employed to correct for this temperature-induced apparent strain. Various compensation schemes are discussed, based on fiber layout and environmental conditions.
Abstract
Similar to electrical foil gages, the optical fiber is sensitive to both strain as well as changes in temperature. In the instance where the strain being measured is large (thousands of microstrain) compared to temperature variations throughout the test (a few °C), this effect can potentially be safely ignored. However, in circumstances where temperature variations are large compared to the expected strain output, these deviations can cause significant errors if not properly accounted for. This Engineering Note describes some methods that can be employed to correct for this temperature-induced apparent strain.