Abstract
A Sagnac-like fiber-loop interferometer sensor has been proposed for the detection of micro crack induced acoustic emission in concrete structures. The use of a Sagnac-like configuration eliminates much of the undesirable noise by combining the reference and the sensing arms within the same optical fiber. The photo-elastic response of optical fiber to ultrasonic stress wave in elastic structural material and the effect of the soft fiber coating are analyzed. The sensor can be configured as a long gauge length sensor to detect the existence of acoustic emission in a large structural area, or as a point sensor with a short gauge length or a coiled long fiber length to detect acoustic wave at a particular location in a structure. Experiments were conducted and compared with the results from traditional piezoelectric transducers.
| Original language | English |
|---|---|
| Pages (from-to) | 6-13 |
| Number of pages | 8 |
| Journal | Sensors and Actuators, A: Physical |
| Volume | 118 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 31 Jan 2005 |
Keywords
- Fiber optic interferometer
- Fiber optic sensor
- Sagnac loop
- Ultrasonic detector
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering