Cameraphone spectrometer for high school chem labs

Computers & Mobile Education Science
Cameraphone spectrometer for high school chem labs


In High School Chem Labs, Every Cameraphone Can Be a Spectrometer” on [via adafruit]

University of Illinois chemistry professor Alexander Scheeline has developed software that turns a camera phone, an LED, and a few other cheap tools into a spectrometer. Armed with these, he thinks we can bring high-end analytic tools to high school chemistry labs all over the world.

Purpose-built spectrophotometers are essential tools in analytic chemistry. By measuring the electromagnetic spectrum a substance absorbs or emits, you can determine its molecular composition. They’re also expensive, which is why they’ve generally been confined to universities. Scheeline has already brought his cellphone spectrometers to high schools in Atlanta and Hanoi. Other high-school chemistry and physics teachers doing professional development at Illinois have also brought Scheeline’s tools to their classrooms.

Initially, Scheeline hadn’t been looking for ways for students to use their phones in class. Instead, he wanted students to build their own spectrophotometry tool, to better understand their instruments and their limitations. Putting together the LED as a light source, diffraction gratings and cuvettes were easy; finding a small sensor to capture the light was hard.

“All of a sudden this light bulb went off in my head: a photodetector that everybody already has! Almost everybody has a cellphone, and almost all phones have a camera,“ Scheeline said. “I realized, if you can get the picture into the computer, it’s only software that keeps you from building a cheap spectrophotometer.”

4 thoughts on “Cameraphone spectrometer for high school chem labs

  1. Shadyman says:

    There was an article a while back about a spectrometer made from a broken CD or DVD, if I recall correctly? Pretty sure it was here on MAKE.

    1. Matt Mets says:

      Perhaps this one?

      I remember making one of these in college, way back before I joined the MAKE empire :-)

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Becky Stern is a Content Creator at Autodesk/Instructables, and part time faculty at New York’s School of Visual Arts Products of Design grad program. Making and sharing are her two biggest passions, and she's created hundreds of free online DIY tutorials and videos, mostly about technology and its intersection with crafts. Find her @bekathwia on YouTube/Twitter/Instagram.

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