Of-8 Infra-Red Spectrum using an IR camera
Published: Tuesday 05 June 2007 - Updated: Monday 28 March 2011
Aim
To demonstrate that the spectrum extends past the visible to the infra red.
Apparatus
- Slide projector
- Diffraction grating
- Slit
- Digital camera with night vision mode.
Diagrams
Click on pictures to enlarge.
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Spectrum pic |
IR Spectrum pic |
Description
A slide projector is set up to display a normal spectrum on the screen. (The IR filter is removed and a 2-3mm slit is placed in the slide carriage). A digital movie camera is focused on the image and the images compared in normal mode and night vision mode. The CCD elements are sensitive to the infra red and normally an IR filter is used to block the IR. In night vision mode this filter is swung out of the way, allowing the infra red to be displayed.