NIR (near infrared) based liquor analyzer in the pulping and recovery area

摘要

The NIR spectral region is defined as the band of wavelengths from 750 to 2500 nm. The quantitative analysis of materials begins with acquiring a spectrum of the sample by using a number of wavelengths within this range. Figure 1 shows a typical Transmission Cell arrangement for analyzing liquid samples such as white, green and black liquors. It is critical that the construction materials meet the harsh process environment that can be present; therefore all metal parts are made of titanium and the lenses are sapphire. This part of the analysis takes 15 seconds.