Light Spectrum Analyzer

Spectrum Analyzer

iOS App, will need to give permission to allow the App to have permission to use your camera and file system when prompted

Physical Apparatus

A diffraction grating to be place in front of the camera

Light source such as a multi propose laser pointer

iPhone or iPad with the App installed

Use

Select one of the three sources of image

Front Camera /Back Camera/File Manager

If the calibrated length between 2 points on the image is to be used, for example, distance between zero order length and the first order diffraction pattern of the red wavelength is approximately 650 nm, then select the radio button calibrated to input a known length.
Move the square start end to re position the start of known calibrated start point and drag the arrow head to the end of the known length.

Similarly, re position the start and end of the free line spectrum to analyze the pixel perceived brightness where the start is BLUE =400 and end is RED =700 nm

The play/pause button will start or stop the calculation of the free line pixel perceived brightness along the line.

Acknowledgement

My sincere gratitude for the tireless contributions of Francisco Esquembre, Fu-Kwun Hwang, Wolfgang Christian, Flix Jess Garcia Clemente, Anne Cox, Andrew Duffy, Todd Timberlake and many more in the Open Source Physics community.
I have designed much of the above based on their ideas and insights.

This research is supported by the eduLab project AEP 01/18 LTK Promoting joy of learning by turning phone into 3 scientific equipment, awarded by the Ministry of Education (MOE), Singapore and managed by National Institute of Education (NIE), Singapore.

reference:

http: //iwant2study.org/ospsg/index.php/projects/576-aep-01-18-ltk-promoting-joy-of-learning-by-turning-phone-into-3-scientific-equipment,

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