Читать книгу Continuous Emission Monitoring - James A. Jahnke - Страница 128

The types of analytical techniques used in today's commercially available CEM monitoring analyzers are listed in Table 1‐1 of Chapter 1. Of these techniques, absorption spectroscopy has been the most commonly applied technique in continuous monitoring systems. Spectrometers developed for pollutant and diluent gas monitoring typically incorporate four essential components:

1 Radiation sources

2 Wavelength selectors

3 Detectors

4 Optical components

These components differ depending upon the region of the spectrum in which the instrument operates and the analytical technique itself. The following sections give examples of these components.