DUAL-CHANNEL FLAME PHOTOMETRIC DETECTOR FOR SENSITIVE SPECTRUM ACQUISITION AND VARIABLE-WAVELENGTH OPERATION

摘要

A dual-channel flame photometric detector has been constructed with the first channel offering high light-throughput to a variable-interference-filter wheel. The wheel can be used stationary or spinning. The former selects a wavelength for conventional FPD operation, the latter provides 100-point spectra at less than 20 nm optical bandpass. The second FPD channel is of the conventional type. The detection limit (S/N-p-p=2) for phosphorus is 0.2 pg/s for either the stationary wheel or the conventional channel, and 0.1 ng of phosphorus produces a clearly recognizable HPO spectrum. An illustrative experiment shows the change-over from CH to CC luminescence in a methane-doped flame.