Development of Nitrogen Components Analyzer Utilizing Quantum Cascade Laser (Second Report)

-Improvement of the response time for NH₃ gas-

Abstract

The nitrogen components (NO, NO₂, N₂O and NH₃) analyzer has been developed utilizing Quantum Cascade Laser (QCL). The QCL can emit coherent light in a mid-infrared region where these nitrogen components have strong absorption. This laser optics configuration can give us a super fine resolution of the mid-infrared spectrum. Therefore, utilizing this spectrometer it is possible to reduce the interference caused by the spectral overlap of co-existing gases in engine exhaust gas. In this report, improvement of the response time of NH₃ measurement has been attempted. Moreover to achieve wide measurement ranges two detectors with two different light path lengths have been used.