In this episode Shahriar takes a look at a new dumpster find! A Photo Research PR-670 SpectraScan has some unique capabilities for measuring light spectrum. In particular, it has an adjustable field of view, as narrow as 0.125 degrees, which allows the spectrometer to ignore the majority of light sources in a scene and only focus on a small visible area. This means it is possible to measure multiple points of a screen or sources of light from far away.
The teardown & theory of operation of the instrument is presented including the spectrometer core which uses a diffraction mirror and linear CCD detector. A few experiments are also conducted which showcase the FOV measurement capability using an array of RGB LEDs. Lastly, the measured spectrum of a mercury discharge lamp is also shown.
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