Note: Effective August 1, 2018, the Quantum Cascade Laser Spectrometer is no longer requestable through the NSF Lower Atmosphere Observing Facilities Deployment Pool.

• There are two separate components to this instrument, both using quantum-cascade tunable infrared laser differential absorption spectroscopy. One module measures CO₂ with an accuracy of 0.1 ppm and a time response of one second. The second measures CO, CH₄, and N₂O, also with the response time of one second. The two instruments share a single aircraft rack. The instrument uses an infrared tunable quantum cascade laser. Detection is via a compact long-path cell. Two lasers are configured to measure CO, CH₄, and N₂O, at 1 Hz frequency and with very high precision (better than 0.5, 1.0, and 0.1 ppb Hz^-1/2, respectively). A second short-path cell of a new design provides high-precision CO₂ measurements (better than 0.1 ppm Hz^-1/2 ) using a third QC-laser.
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  • (Top left)  Long-path, dual laser, CO_CH4_N2O sensor. Flight hardware with the long-path cell, dual laser assemblies, dual detectors (in one housing), etc., on the shock-mounted optical bench.
  • (Top right)  Assembly showing the purged pressure housing.
  • (Bottom)  CO₂ HAIS sensor. Flight hardware of the optical module showing (1) dual detector, (2) dual 4 cm cells, (3) QCL laser assembly.

The QCLS in a GV rack as installed for flight.