Abstract
We have developed a wide frequency range affordable optical chopper system from 10–550 Hz. It is a self-contained prototype built using 3D design and printing and Arduino UNO. The system consists of six chopper wheels that are 3D designed using open-source software, Blender and printed on FlashForge 3D printer using polylactic acid. Two Arduino Uno’s have been deployed in the present system- One for controlling the rotation speed of the optical choppers and another for frequency measurement of the modulated output. The adoption of open-source approach makes it possible for any undergraduate (UG) or researcher to emulate the present system with possible modifications as per their need for use in their laboratories. It has made optical chopper system which is a widely used instrument, affordable for the UG/research labs costing below USD 50 whereas the cost of the commercially available systems is in the range of USD 800–1000 and that too with a matching performance and adaptability.
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