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Advanced Fast-Response O3 and CO Instruments: Operating Principles and Performance Overview

This document outlines the operating principles, conditions, and performance specifications of the HAIS Fast-Response O3 instrument, utilizing chemiluminescence for NO detection, and the Aero-Laser VUV resonance fluorescence technique for CO measurement. It details the integrated systems for efficiency, sharing vacuum pumps and data systems among O3, CO, and NO/NOy measurements. Calibration and testing procedures, including the evaluation of different inlet configurations, alongside operational details of the MayComm Open-Path Laser Hygrometer, are also discussed, ensuring precision for atmospheric studies.

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Advanced Fast-Response O3 and CO Instruments: Operating Principles and Performance Overview

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  1. HAIS Fast-Response O3 Instrument Basic operating principle: NO chemiluminescence Operating conditions: Performance specifications: *S/N = (signal-background)/2(background)1/2 †Detection limit = 2(Background)1/2/sensitivity

  2. Carbon Monoxide Instrument Basic operating principle: Aero-Laser VUV resonance fluorescence Operating conditions: Performance specifications:

  3. Status • Overview: • Fabrication complete • Lab and flight tests for sensitivity and frequency response • During HEFT 08 preparation and research flights • Two inlet configurations will be evaluated for best time response during HEFT • Instrument will require periodic absolute calibrations on ground between flights • Integrated with other measurements: • Vacuum pump shared between O3 , CO, and NO/NOy • Data system shared between O3, NO, and NOy • One operator for all 4 measurements

  4. NO Containment Vessel 26 lbs Fast-O3/CO Rack 21.5 lbs HAIS fast-O3 instrument

  5. MayComm Open-Path Laser Hygrometer • Principle: Dual beam near IR laser absorption • Range: 2 to ~40,000 ppmv • Sampling Rate: 1 – 20 Hz • Operation mode: autonomous • Calibration: Kahn/Michell DCS-80 • Dewpoint Generation: • Temperature- and pressure-controlled saturator and dilution system • Reference Hygrometer: • Range: -75 to +20 dewpoint • Accuracy: +/- 0.2ºC

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