Abstract
A novel fiber optic evanescent wave spectroscopy (FEWS) system is based on a tunable diode laser (TDL) source, on a polymer-coated AgClBr infrared transmitting fiber, and on a mercury cadmium telluride detector. This system was used for sensing low levels of chlorinated hydrocarbons in water. The detection limit was 100 μg/l (100 ppb), which is an improvement by a factor of 50 in comparison to a similar system that is based on a Fourier transform infrared spectrometer, and the measurement time was reduced by a factor of 3. The TDL-FEWS system shows significant potential for in situ monitoring of ground water.
| Original language | English |
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| Pages (from-to) | 1868-1870 |
| Number of pages | 3 |
| Journal | Applied Physics Letters |
| Volume | 63 |
| Issue number | 14 |
| DOIs | |
| State | Published - 1993 |