Abstract
To detect ultrasound remotely, an optical detection scheme is described which uses a confocal Fabry-Pérot interferometer and conjugate detection. A conjugate signal is derived from the interferometer by making simultaneous use of optical back-reflection, and optical transmission, through the interferometer. Theoretical and experimental results have demonstrated that the new scheme has higher sensitivity than established transmission schemes. Sensitivity enhancements between 2 and 17 times can be expected. Depending on mirror reflectivity, the frequency response is approximately flat in the range of 10 MHz and above, limited only by the free spectral range of the interferometer device.
| Original language | English |
|---|---|
| Pages (from-to) | 173-175 |
| Number of pages | 2 |
| Journal | Ultrasonics |
| Volume | 34 |
| Issue number | 2-5 |
| Publication status | Published - Jun 1996 |
Keywords
- Confocal fabry-pérot interferometer
- Laser ultrasound
- NDT