| Author | Message | ||
     Eric |
Hi all, We have argued the filter for a few days. Any comments are welcomed! We will install a long wavelength pass filter on our FT-NIR, which blocks the short wavelengh light. Only the light wavelength above 2000 nm can pass through the filter. The questions are: 1)Shoud the absorbance be same after the filter installing? Since A=I/Io. Filter blocks part of light, the Io decreases. I also decrease. Therefore, absorbance (A) should be same. Is it correct? 2) Since the absorbance is same, we cannot increase the pathlength, because A=xlc. Concentration (c) and absorbance (A) are constant, so we cannot use a longer pathlength. Right? 3) The filter blocks some light. We can change to a more powerful light lamp. But, how much can we increase? Is there any formula? 4) If a more powerful light lamp is applied, how is the temperature effect? Anyone has experience? 5) What does the filter exactly do? Only blocks some light? In other words, what can be improved? Thank you!!! Eric |