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What does the optical resolution of the spectrometer determine?

Release time: 2020-01-07 09:46:30 Click: 740

The optical resolution of a spectrometer is defined as the smallest wavelength difference that the spectrometer can resolve. To separate the two spectral lines, at least image them onto the two adjacent pixels of the detector. Because the grating determines the degree of separation (dispersion) of different wavelengths on the detector, it is a very important parameter that determines the resolution of the spectrometer.

Another important parameter is the width of the beam entering the spectrometer, which basically depends on the fixed width of the entrance slit or fiber core diameter (when no slit is installed) installed on the spectrometer.

At the specified wavelength, the image formed by the slit on the detector array usually covers several pixels. If you want to separate the two spectral lines, you must disperse them to the size of this image plus one pixel. When using a fiber with a large core diameter, you can increase the resolution of the spectrometer by selecting a slit that is narrower than the fiber core diameter, because this will greatly reduce the width of the incident beam.

3 ),因此在最长波长处会得到最高分辨率。 The effect of the selected grating and the effective width of the incident beam (fiber core diameter or entrance slit) on the resolution. The higher the number of grating pairs, the more pronounced the dispersion effect changes with the wavelength. The longer the wavelength, the greater the dispersion effect (Table 3 ) Therefore, the highest resolution will be obtained at the longest wavelength.  

nm Spectrometer resolution (half peak width nm )  

狭缝 Score / Slit

10

25

50

100

200

600

1

1.3

2

3.6

7.2

1200

0.45

0.6

0.9

1.7

3.4

1800

0.27

0.35

0.54

1

2

2400

0.21

0.28

0.43

0.78

1.56

。 * Note: The above is only the conventional resolution, which depends on the starting wavelength of the grating; the longer the wavelength, the greater the dispersion of the grating .

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