Highly sensitive fiber loop ringdown strain sensor with low temperature sensitivity

作者：Ghimire Maheshwar; Wang Chuji^*

来源：Measurement Science and Technology, 2017, 28(10): 105101.

DOI：10.1088/1361-6501/aa82a3

• strain sensor
• fiber optic sensor
• fiber loop ringdown

We report a highly sensitive strain sensor with low temperature sensitivity based on the fiber loop ringdown technique. An innovative approach that employs a micro air-gap as the strain sensor head is described. The sensor has demonstrated the static strain sensitivity of 0.26 mu s/mu epsilon,corresponding to the detection limit of 65 ne with the low temperature cross sensitivity of 37 n epsilon/degrees C. This is the highest static strain sensitivity achieved without using a combination of fiber optic sensing components, such as fiber Bragg gratings or Fabry-Perot interferometers. Moreover, the sensor design allows the strain sensitivity and measuring range to be adjusted by changing the length of the sensor.

• 出版日期2017-10