Abstract
Diode laser absorption measurements obtained with two-tone frequency-modulation spectroscopy (TTFMS) are combined with tomography to produce spatially resolved quantitative images of fluid flows. The high sensitivity, good accuracy, and high stability of TTFMS absorption measurements permit optical-absorption tomography to be performed with low noise on extremely weakly absorbing objects. The method is demonstrated on a small oxygen flow with a GaAlAs diode laser operating near 760 nm and with an absorption sensitivity of 1:106.
| Original language | English |
|---|---|
| Pages (from-to) | 1489-1491 |
| Journal | Optics Letters |
| Volume | 19 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - 1994 |
Subject classification (UKÄ)
- Atom and Molecular Physics and Optics