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Context: homemade IR spectrometer with diffraction grating.

Since

$$m \lambda = d \sin \Theta _{m}$$

diffraction maxima of higher orders from shorter wavelengths will be mixed with lower order maxima for longer wavelengths. For example order 2 for $\frac{\lambda}{2}$ with order 1 for $\lambda$.

This means I cannot simply associate given $\Theta$ with one wavelength.

How can I solve this problem using DIY methods?

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  • $\begingroup$ Usually one uses monochromatic light, so there's only one $\lambda$ to be concerned about. As for DIY methods, I'm not sure but I imagine there are filters you could purchase. $\endgroup$ – Kyle Kanos Jan 14 at 11:10
  • $\begingroup$ You set up the geometry of the given grating and detector so that you don't have significant overlap of orders across the spectrum of interest. $\endgroup$ – Jon Custer Jan 14 at 14:12

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