Performance across the full wavelength range of 400 to 2500 nm
The innovative use of technology according to the demands of particular routine analysis applications is a principle behind all FOSS dedicated analytical solutions.
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Predispersive monochromator A holographic grating separates white light into individual wavelengths. An encoder correlates the position according to the wavelength and filters ensure that only first order radiation (most intense) is made available from 400 nm to 2500 nm in a single scan. |
Advantages of monochromator technology
When designing the next step in NIR, our talented engineers chose to make use of the latest in predispersive monochromotor technology as the most stable and versatile option for routine feed analysis.
It was chosen for its high signal to noise (S/N) ratio across the whole range. This gives accurate analysis of parameters commonly measured with NIR as well as demanding parameters such as amino acids and other low level parameters in need of high accuracy.
In comparison, Fourier Transform near infrared (FT-NIR) is a powerful technology, but this strength lies mainly at wavelengths over 1800 nm. Diode array is another excellent technology but, the S/N ratio falls above 1650 nm.
Calibration transfer
The innovative design of the NIRS DS 2500 also avoids the problems of calibration transferability sometimes associated with monochromator-based instruments. The spectrometer is equipped with internal standards for control of light intensity, bandwidth and wavelength position. Its stability can be validated to ensure that data transfer is continuously seamless, even over time.
Overall, the monochromator technology offers:
| Wavelength range |
400-2500 nm |
| Detector |
Silicon (400-1100 nm), Lead Sulfide (1100-2500 nm) |
| Optical bandwidth |
8.75 ±0.1 nm |
| Spectral resolution |
0.5 nm |
| Number of data points |
4200 |
| Absorbance range |
Up to 2 AU |
- Unsurpassed S/N ratio from 400 – 2500 nm and thereby high resolution spectra over whole wavelength range
- Versatility in choice of applications for example, amino acids, astaxanthin and chlorophyll alongside the more commonly measured parameters
- Excellent calibration transferability with internal standards to control the stability of the spectrometer
