Читать книгу Continuous Emission Monitoring - James A. Jahnke - Страница 132

Heated materials will emit radiation in the infrared region of the spectrum. Among those used are Nernst Globars (fused hollow rods of zirconium and yttrium oxides, heated to about 1500 °C), Globars (heated rods of silicon carbide), carbon rods, and heated nichrome wire. These sources emit light over a range of wavelengths, from which the analyzer selects to make gas concentration measurements.