The Invention of Mountable Camera Device for Photo Taking of Light Spectra Diffracted from Grating

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Buncha Silskulsuk*
Thanikan Sritonwong
Arunee Intasorn


The device is consisted of five simple convex lenses with various focal lengths, a collimator system, a transmission grating and a CMOS (Complementary Metal Oxide Semiconductor) detector in DSLR (Digital Single Lens Reflex) camera. They are mounted on optical bench covered with PVC horizontal cylinder which is portable. The obtained images stored as .jpeg file format are transferred from camera to PC for data acquisition and analysis. This work shows how to invent the device which light color spectral image can be displayed together with the quantitative values of the light intensity analysis. The obtained results of wavelength values
compared with the standard ones are in the range from 0.03% to 1.55%. The benefits of this device are the provision of light color spectral images from experiments to support the observations and
analysis of diffraction color spectra in optical experiments, and it can be utilized as a teaching media as well.
Keywords: CMOS sensor, transmission grating, Fraunhofer diffraction pattern, spatial light
intensity distribution analysis, light color spectral display.

* Corresponding author: Tel: 081-4999350 Fax: 0-2469-5598


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