SODIUM LIGHT INTENSITY MONITOR

摘要

A method and apparatus are disclosed for measuring the amount of characteristic light produced by a process to be monitored. Light in a waveband characteristic of the process is measured. Light in nearby non-characteristic wavebands is also measured and used an in indication of the amount of background light in the characteristic waveband. The amount of background light is subtracted from the total amount of light in the characteristic waveband, and the result is a measurement of the intensity of light produced by the process. An example of the embodiment applies the invention to the measurement of sodium light produced by burning sodium.