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What does the optical resolution of a spectrometer determine?

Release time: 2020-01-07 09:46:30 Click: 417

The optical resolution of a spectrometer is defined as the smallest wavelength difference that a spectrometer can resolve. To separate the two spectral lines, they must be imaged on at least two adjacent pixels of the detector. Because the grating determines the degree to which the different wavelengths can be separated on the detector (dispersion), it is a very important parameter to determine the resolution of the spectrometer.

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

At a 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 this image size plus one pixel. When using a fiber with a large core diameter, you can increase the resolution of the spectrometer by selecting a narrower slit 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 incident slit) on the resolution 3 ), so the highest resolution is obtained at the longest wavelength.  

nm Resolution of spectrometer (half-peak width nm )  

狭缝 Graticule / 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 are general resolutions, depending on the starting wavelength of the grating; the longer the wavelength, the greater the grating dispersion .

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