For fiber spectrometers, the spectral range is usually between 200nm-2200nm. It is difficult to obtain a wider spectral range due to the higher resolution required; at the same time, the higher the resolution requirement, the less the luminous flux. For the requirements of lower resolution and wider spectral range, a 300 line / mm grating is the usual choice. If a higher spectral resolution is required, it can be achieved by selecting a grating of 3600 lines / mm or a detector with more pixel resolution. The narrower slit can improve the resolution, but the luminous flux is smaller;
On the other hand, wider slits can increase sensitivity, but will lose resolution. In different application requirements, choose the appropriate slit width in order to optimize the entire test results. The detector determines the resolution and sensitivity of the optical fiber spectrometer in some aspects. The light sensitive area on the detector is in principle limited. It is divided into many small pixels for high resolution or less but larger Pixels are used for high sensitivity. Usually the sensitivity of the back-sensitive CCD detector is better, so you can get better resolution without sensitivity to some extent.
The near-infrared InGaAs detector has high sensitivity and thermal noise, so the cooling method can effectively improve the signal-to-noise ratio of the system.
Due to the influence of multi-order diffraction of the spectrum itself, the use of filters can reduce the interference of multi-order diffraction. Unlike conventional spectrometers, fiber optic spectrometers are coated on the detector. This part of the function needs to be installed in place at the factory. At the same time, this coating also has anti-reflection function to improve the signal-to-noise ratio of the system.
The performance of the spectrometer is mainly determined by the spectral range, optical resolution and sensitivity. Changes to one of the above parameters will usually affect the performance of the other parameters. The main challenge of the spectrometer is not to maximize all the parameters during manufacturing, but to make the technical specifications of the spectrometer meet the performance requirements for different applications in this three-dimensional space selection. This strategy enables the spectrometer to satisfy customers with the smallest investment and obtain the maximum return.
The size of this cube depends on the technical indicators that the spectrometer needs to achieve, and its size is related to the complexity of the spectrometer and the price of the spectrometer product. Spectrometer products should fully meet the technical parameters required by customers. Spectrometers with a small spectral range usually give detailed spectral information, whereas a large spectral range has a wider visual range. Therefore, the spectral range of the fiber spectrometer is one of the important parameters that must be clearly specified.
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