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Beamsplitters Low Manufacturing Cost, Suitable For Large Area Promotion
Jul 05, 2017

Near-infrared spectrometer a wide range of classification from the application point of view, can be divided into online process monitoring equipment, special equipment and general equipment. Spectral information obtained from the instrument, there are only a few wavelengths of specialized instruments,Beamsplitters there can be measured near the infrared spectrum of the research instrument; some dedicated to the determination of short-band near-infrared spectroscopy, and some apply to the determination of long Band near-infrared spectroscopy. The more commonly used classification model is based on the instrument in the form of spectral classification, can be divided into filter type, dispersion type (grating, prism), Fourier transform type and so on. The following are described separately.

Filter type near infrared spectroscopy instrument

Filter-type near-infrared spectroscopy instrument to filter as a spectral system, that is, the use of filters as monochromatic optical devices. Filter-type near-infrared spectroscopy instrument can be divided into fixed filter and adjustable filter in two forms,Beamsplitters which fixed filter-type instrument is near infrared spectrometer the earliest design. When the instrument is working, the light emitted by the light source passes through the filter to obtain a certain broadband monochromatic light, and after the action of the sample to reach the detector.

The advantages of this type of instrument are: the instrument is small, can be used as a dedicated portable instrument; manufacturing cost is low, suitable for large area promotion.

The shortcomings of this type of instrument are: monochromatic light band is broad, the wavelength resolution is poor; the temperature and humidity is more sensitive; can not get the continuous spectrum; can not pretreat the spectrum, get less information. It can only be used as a relatively low-end special equipment.

Dispersive Near Infrared Spectroscopy Instrument

The spectroscopic element of the dispersion-type near-infrared spectroscopy instrument may be a prism or a grating. In order to obtain a higher resolution, the modern dispersion type instrument uses the holographic grating as the spectroscopic element. The scanning instrument rotates through the grating so that the monochromatic light passes through the sample according to the wavelength and enters the detector. Depending on the physical properties of the sample, different sample detector elements can be selected for projection or reflection analysis.

The advantages of this type of instrument: the use of scanning near-infrared spectroscopy can be full-spectrum scanning of the sample, scanning repeatability and resolution than the filter-type instrument has a large degree of improvement, the individual high-end dispersion near infrared spectrometer also Can be used as a research grade instrument.

The application of chemometrics in near-infrared is one of the characteristics of modern near-infrared analysis. By using the full spectrum analysis,Beamsplitters a lot of useful information can be extracted from the near infrared spectrum. The spectral model is correlated with the nature (composition and characteristic data) of the training set by a reasonable econometric method to obtain the corresponding correction model. The nature of the unknown sample.

The shortcomings of this type of instrument: grating or mirror mechanical bearings for a long time continuous use easy to wear, affecting the wavelength accuracy and reproducibility; due to more mechanical parts, the instrument's poor seismic performance; spectrum susceptible to stray light interference; Scanning speed is slow, poor expansion performance. As a result of the use of external standard sample calibration equipment,Beamsplitters its resolution, signal to noise ratio and other indicators than the filter-type instrument has been greatly improved, but compared with the Fourier-type instrument is still a qualitative difference.





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