Automation of long-path absorption cell measurements
1US Army Atmospheric Sciences Laboratory, White Sands Missile Range, New Mexico 88002.
The Review of Scientific Instruments
|January 1, 1979
Summary
New long-path absorption cells simplify alignment and boost measurement accuracy for atmospheric absorbers. These advancements allow single-person operation for routine low absorption coefficient measurements.
Area of Science:
- Atmospheric science
- Optical spectroscopy
- Instrumental analysis
Background:
- Long-path absorption cells are crucial for measuring atmospheric absorbers.
- Previous designs required complex alignment and multiple operators.
- Improving accuracy and ease of use is essential for routine measurements.
Purpose of the Study:
- To present recent operational advancements in long-path absorption cells.
- To detail unique gear designs for mirror adjustment.
- To describe techniques for precision optical alignment and automation.
Main Methods:
- Utilized unique low-torque linear drives for mirror adjustment.
- Implemented remote Selsyn controls for automated cell operation.
- Employed precision optical alignment techniques, including infrared radiation sources.
Main Results:
- Achieved easier alignment and improved measurement accuracy.
- Enabled single-person routine measurements of low absorption coefficients.
- Demonstrated rapid pathlength changes and precision beam repositioning.
Conclusions:
- Refined long-path absorption cell operation enhances system accuracy.
- New designs facilitate efficient and precise atmospheric absorption measurements.
- Automation and improved alignment reduce operational complexity and increase reliability.
