Measurement of NO, NO2 and HNO3 using a tunable diode laser system. First year report. Phase 1: Development and field study

A tropospheric air monitoring system (TAMS) was developed by UNISEARCH ASSOCIATES INC. under contract to the CRC CAPA-19-80 program. The TAMS uses the principle of infrared absorptions which can, in principle, be used for the majority of atmospheric trace gases. It combines the high selectivity of a tunable diode spectrometer with the sensitivity of long path absorption provided by a White cell. The system developed under this contract was for manual operation and data was retrieved from a strip chart recorder.