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Transportable automated ammonia sensor based on a pulsed thermoelectrically cooled quantum-cascade distributed
Anatoliy A Kosterev1, Robert F Curl, Frank K Tittel
1Rice Quantum Institute, Rice University, Houston, Texas 77251-1892, USA. akoster@rice.edu
Applied Optics
|March 22, 2002
Summary
A new compact ammonia sensor uses a quantum-cascade laser to detect NH3 concentrations. It achieves high sensitivity, enabling continuous monitoring for extended periods.
Area of Science:
- Quantum optics
- Gas sensing technology
- Laser spectroscopy
Background:
- Accurate and continuous monitoring of ammonia (NH3) is crucial for various applications, including environmental monitoring and industrial safety.
- Existing ammonia sensing technologies may face limitations in sensitivity, portability, or continuous operation.
Purpose of the Study:
- To develop a compact and highly sensitive ammonia sensor.
- To demonstrate the feasibility of using a quantum-cascade laser for precise NH3 concentration measurements.
Main Methods:
- Development of a compact, single-frequency, pulsed quantum-cascade laser sensor with distributed feedback.
- Utilizing the laser to scan over two absorption lines within the fundamental v2 band of ammonia.
- Implementing computer control for automated, continuous monitoring and data storage.
Main Results:
- Achieved a sensitivity better than 0.3 parts per million (ppm) for ammonia detection.
- Demonstrated effective operation with a short 1-m optical path length.
- Successfully implemented automated, continuous monitoring capabilities.
Conclusions:
- The developed quantum-cascade laser-based ammonia sensor offers a compact and sensitive solution for NH3 monitoring.
- The system's automation and data logging capabilities support long-term, continuous measurements.
- This technology holds promise for improved environmental and industrial ammonia sensing applications.