Aspects of the present invention provide novel methods and devices for
sampling gas, exciting the sampled gas to emit radiation and detecting in
real time from the emitted radiation a plurality of wave bands of an
emission spectrum. Energy used to excite the sampled gas may be adjusted
based on the detected wave bands. A process may be controlled in real time
based on the detected wave bands. Novel interfaces may be used to display
portions of the detected wave bands. A known flow of a reference gas may
be included in the flow of sampled gases and an unknown flow of an unknown
flow gas determined.
