Ocean-optics NIR User Manual download pdf (Page 21)

Appendix A

Calibrating the Wavelength of

the NIR Spectrometer

This Appendix describes how to calibrate the wavelength of your spectrometer. Though each

spectrometer is calibrated before it leaves Ocean Optics, the wavelength for all spectrometers will drift

slightly as a function of time and environmental conditions.

About Wavelength Calibration

You are going to be solving the following equation, which shows that the relationship between pixel

number and wavelength is a third-order polynomial:

= I + C

p + C

+ C

Where:

= the wavelength of pixel p

I = the wavelength of pixel 0

= the first coefficient (nm/pixel)

= the second coefficient (nm/pixel

)

= the third coefficient (nm/pixel

)

You will be calculating the value for I and the three Cs.

Calibrating the Spectrometer

Preparing for Calibration

To recalibrate the wavelength of your spectrometer, you will need the following:

197-00000-512-02-0707 15

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 35 36

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Ocean-optics NIR User Manual Page 21