A compact ammonia sensor based on a 10-μm single-frequency, thermoelectrically cooled, pulsed quantum-cascade laser with an embedded distributed feedback structure has been developed. To measure NH3 concentrations, we scanned the laser over two absorption lines of its fundamental v2 band. A sensitivity of better than 0.3 parts per million was achieved with just a 1-m optical path length. The sensor is computer controlled and automated to monitor NH3 concentrations continuously for extended periods of time and to store data in the computer memory.
All Science Journal Classification (ASJC) codes
- Engineering (miscellaneous)
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering