Fiber spectrometer
Fiber spectrometer
Instrument Introduction
Fiber spectrometers usually use optical fiber as a signal coupling device, the measured light is coupled to the spectrometer for spectral analysis. Due to the convenience of the optical fiber, the user can build a spectral acquisition system with great flexibility.
The advantages of fiber spectrometers lie in the modularity and flexibility of the measurement system.
The basic configuration of a fiber optic spectrometer includes a grating, a slit, and a detector. The parameters of these components must be specified when ordering the spectrometer. The performance of the spectrometer depends on the exact combination and calibration of these components, and the calibrated fiber optic spectrometer, in principle, can not change any of these components.
Has a wide selection of spectrometer configurations to maximize performance to meet customer requirements. If these configurations do not meet your requirements, we can tailor them to your requirements.
At present, the optical fiber spectrometer in the country mainly imported brand-based, not many domestic manufacturers.
The choice of grating depends on the spectral range and resolution requirements. For fiber optic spectroscopy, the spectral range is usually between 200nm-2200nm. Due to the relatively high resolution it is difficult to get a wide spectral range; at the same time the higher the resolution requirements, the light flux will be less than normal. For the lower resolution and wider spectral range requirements, a 300 line / mm raster is the usual choice. If higher spectral resolution is required, this can be done by selecting a grating of 3600 lines / mm or by selecting a detector with more pixel resolution.
Narrow slits increase resolution but have a low luminous flux; on the other hand, wider slits increase sensitivity but lose resolution. In different application requirements, select the appropriate slit width in order to optimize the entire test results.
The detector determines in some ways the resolution and sensitivity of the fiber optic spectrometer. The light-sensitive area on the detector is, in principle, limited and it is divided into many small pixels for high resolution or divided into smaller but larger Pixel for high sensitivity. Normally backlit CCD detectors are much more sensitive, so you can get a better resolution with some degree of sensitivity. Near-infrared InGaAs detector due to its high sensitivity and thermal noise, the use of refrigeration can effectively improve the system's signal-noise ratio. Retrofit spectrometers rely on product lineups from leading manufacturers of the world's leading optical detectors, such as Sony, Hamamatsu, Thoshiba and others.
Due to the multi-order diffraction of the spectrum itself, the filter can reduce the interference of multi-order diffraction. Unlike conventional spectrometers, fiber spectrometers are coated on the detector, and some of these functions need to be installed in the factory. At the same time this coating also has anti-reflection function, improve the system's signal to noise ratio.
Spectrometer performance 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 with spectrometers is not to maximize all of the parametric specifications at manufacture, but to make the spectrometer's specifications support the performance requirements for different applications in this three-dimensional space of choice. This strategy enables spectrometers to meet the maximum return customers need with minimal investment. The size of this cube depends on the specifications that the spectrometer needs to meet, and its size depends on the complexity of the spectrometer and on the price of the spectrometer product. Spectrometer products should be fully in line with customer requirements of the technical parameters. Multiple types of spectrometer products can be found in a variety of applications for equipment and no longer need to design high-priced models.
Spectral range
A spectrometer with a small spectral range usually gives detailed spectral information, whereas a wider spectral range has a wider visual range. The spectral range of the spectrometer is therefore one of the important parameters that must be explicitly specified.
Affect the spectral range of the main factors are grating and detector, according to different requirements to select the appropriate grating and detector.
Optical resolution is an important parameter to measure the spectral power. It depends on the bandwidth of the monochromatic light when it is detected by the thermal element. Three components have an impact on the resolution: incident slit, grating and detector pixel size. Smaller slits give better resolution but lower sensitivity; highly scored rasters increase resolution but lower the spectral range; smaller detector pixel sizes increase resolution but lower sensitivity .
From the above it can be seen that there is a very close relationship between the three important indicators of the selection spectrometer. Often we want to know what we need most and choose the slits, gratings and detectors based on the above principles.
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