Spectrometry
upgrade:spectrometry

The Public Lab spectrometry project is an open source community effort to develop low-cost spectrometers for a range of purposes. All open spectrometry hardware and software efforts are welcome here! **Join in by:** * Learning [what spectrometry is](#Whats+spectrometry) * Reading about goals and [asking great questions](#Frequently+Asked+Questions) * Building a basic spectrometer using [one of our starter kits](#Starter+Kits) * Trying (and critiquing) our [community-made how-to guides](#Activities) and posting your own * Building on others’ work; hack and remix the kits to refine and expand them * [Share your upgrades](#Upgrades) for others to try -- and perhaps for inclusion in an upcoming starter kit release or add-on kit **** ## Starter Kits Public Lab’s Kits initiative offers several starter kits, including many of the basic components, and instructions for constructing a basic visible light spectrometer. The point of the kits is to provide a shared reference design for building experimental setups onto. Lego Spectrometer Kit Our most recent kit, incorporating community improvements while balancing low cost and ease of construction. Choose between webcam and Raspberry Pi camera versions and build attachments width standard Lego connectors. Build one Buy one Papercraft Spectrometry Intro Kit A $9 paper spectrometer which you can attach to a smartphone or webcam. It’s made of paper to reduce cost and complexity, and is mainly intended as an “introductory” or educational kit. The flat design can be printed on a laser printer or photocopied to make more. Build one Buy one **** ## Activities This is a list of community-generated guides for specific applications using your spectrometry setup (either a [starter kit](#Starter+Kits) or a [modded design](#Upgrades)). These [activities can be categorized](https://publiclab.org/wiki/activity-categories), and some may be more reproduced -- or reproducible -- than others. Try them out to build your skills, and help improve them by leaving comments. Together, we can repeat and refine the activities into experiments. > **Note:** If you are working on an **urgent issue** such as a threat to your or someone else’s health, please know that these techniques may not be ready for your use; it's possible that they never will be. [Read more here](/notes/gretchengehrke/09-29-2016/common-low-cost-technique-limitations) ### Activity grid [activities:spectrometry] **** ## Upgrades Have you added to your starter kit, improved it, or redesigned it? Show others how to take it to the next level by posting a build guide here: [upgrades:spectrometry] Add your upgrade guide here Request or propose an upgrade _Mods should include a parts list and a step-by-step construction guide with photo documentation. See an example._ **** ## Challenges We're working to refine and improve DIY spectrometry on a number of fronts; here, take a look at the leading challenges we're hoping to solve, and post your own. For now, we're using the Q&A feature, so just click "Ask a question" to post your own challenge. Be sure to add: * constraints: expense, complexity * goals: performance, use cases [questions:spectrometry-challenge] **** ## Builds There’s a lot going on in open source spectrometry -- if you’ve developed another open source design you’d like to show others how to construct, post it here! * [RamanPi](https://hackaday.io/project/1279-ramanpi-raman-spectrometer) * [Hackteria “drop”-style spectrometers](https://publiclab.org/notes/gaudi/04-03-2014/diy-micro-volume-spectrophotometer) / [DIY NanoDrop on Hackteria.org](http://hackteria.org/wiki/index.php/DIY_NanoDrop) * _Add yours here_ ##What's spectrometry? Colored light is often a blend of different colors. A spectrometer is a device which splits those colors apart, like a prism, and measures the strength of each color. A typical output of a spectrometer looks like this spectrum of the daytime sky, with the actual light spectrum at the top and the graph of wavelength (horizontal axis, in nanometers of wavelength) and intensity (vertical axis) below: [![sky.png](https://i.publiclab.org/system/images/photos/000/005/455/original/sky.png)](https://spectralworkbench.org/analyze/spectrum/19882) > Needed: overview of spectra, calibration, units, comparison, and fluorescence/absorption. Please edit this page or link to a resource, potentially [the Wikipedia page](https://en.wikipedia.org/wiki/Spectroscopy), although that's quite full of technical jargon. ## Software Spectral data can be analyzed with https://spectralworkbench.org to create spectra plots, find centers of emissions plots, and find similar spectra. Data also can be exported in various formats (JSON, CSV, XML) for further analysis and visualization. ## How does this compare to a lab instrument? The [Desktop Spectrometry Starter Kit](/wiki/desktop-spectrometry-kit-3-0) is only one part in an experimental setup, and the following shows where it fits in an overall diagram of a lab spectrometric setup: [![tmp_31873-IMG_20161027_101601_2-79757779.jpg](https://publiclab.org/system/images/photos/000/018/635/large/tmp_31873-IMG_20161027_101601_2-79757779.jpg)](https://publiclab.org/system/images/photos/000/018/635/original/tmp_31873-IMG_20161027_101601_2-79757779.jpg) [![tmp_31873-IMG_20161027_095939_2-108076392.jpg](https://publiclab.org/system/images/photos/000/018/636/large/tmp_31873-IMG_20161027_095939_2-108076392.jpg)](https://publiclab.org/system/images/photos/000/018/636/original/tmp_31873-IMG_20161027_095939_2-108076392.jpg) There are many, many different types of spectrometry and spectrometers -- many don’t even measure light. Even among those that do, some detect light in the ultraviolet range, and others in the infrared range of light. The range of Public Lab spectrometers depends on the range of the commercially available cameras we attach them to (~400-700 nanometer wavelengths). A commercially available product with a slightly wider range (from 335 to 1000 nanometers) is [available from Cole Parmer](http://www.coleparmer.com/Product/Cole_Parmer_Visible_spectrophotometer_335_to_1000_nm_wavelength_range_analog_output/UX-83055-10). **** ## Frequently Asked Questions [questions:spectrometry] Note our previous Frequently Asked Questions page, which [can be found here »](/wiki/spectrometer-faq) -- please help port these into the new system, here!...


Author Comment Last activity Moderation
warren "Looking at ways to get more people to replicate this in an upcoming PL event in Somerville, possibly using this template to photo document on paper..." | Read more » over 6 years ago
warren "Hi, Dave - can you link the words "The PLab 3.0 spectrometer" to https://publiclab.org/wiki/desktop-spectrometry-kit-3-0, to lead people back to th..." | Read more » over 6 years ago
warren "Posted the build! Still need to take a spectrum and upload, but looking pretty good so far. " | Read more » over 6 years ago
warren "@stoft has proposed a set of tests and thresholds for different rigidity"standards" of sorts, here: https://publiclab.org/notes/stoft/09-15-2016/wh..." | Read more » over 6 years ago
warren "I like this idea -- you're right, even 1/2 oz would be plenty. Abdul, what do you think about that as an assembly step? Would one of those "push to..." | Read more » over 6 years ago
stoft "@abdul, I'd not consider superglue because of it's negative properties for human skin -- a safety hazard. Remember, the kits are sold for education..." | Read more » over 6 years ago
warren "Thanks, Dave -- I did a degree in architecture and so spent many a sleepless night gluing wood things together -- and I agree that not all glue is ..." | Read more » over 6 years ago
abdul "Would superglue be acceptable? The justification of superglue is outlined below: -It dries quickly -It comes already in small containers -It is..." | Read more » over 6 years ago
stoft "The size of the 'square' parts is close to 0.5-in but the "ideal" value is set by the "height" of the camera lens after the camera is mounted. The ..." | Read more » over 6 years ago
warren "Also, Dave -- a question: if people work to reproduce this, what are (in your opinion) the tolerances here? Could people make this with a different..." | Read more » over 6 years ago
stoft "Except ..... there is a real advantage of using the "yellow" "woodworkers glue", rather than white glue. "White glue" seems to be sold in different..." | Read more » over 6 years ago
warren "I love this. I think white glue (EVA, like Elmers) is probably plenty good for this purpose, and most people will have some. But @abdul, I wonder i..." | Read more » over 6 years ago
stoft "Done. " | Read more » over 6 years ago
warren "I def. agree -- that's what I was trying to get at with 'set a test here to "load test"' and @bsugar actually posted a request for a method to test..." | Read more » over 6 years ago
stoft "Thoughts: 1 - Splash-resistant, maybe, (there are holes), 2 - Masonite does not cut nicely, 3 - Acrylic (even laser-cut) tends to have very sharp e..." | Read more » over 6 years ago
warren "I think the main challenges are: whether moving/tugging the cable moves the webcam at all whether twisting the spectrometer (now that it's not as..." | Read more » over 6 years ago
warren "So just above the tag box, there's a little "quiz" to add details -- fill that out and it'll auto-tag your post appropriately! You can enter custom..." | Read more » over 6 years ago
warren "I think we could make cardboard, masonite and acrylic versions and set a test here to "load test" them for rigidity -- see what's the best compromi..." | Read more » over 6 years ago
warren "I'd like to put some screw holes in the side so you can attach things more easily, and a hole in the side so you can shine a light in without needi..." | Read more » over 6 years ago
dhaffnersr "@abdul, hello abdul, my work will no longer be published here at Plab, if you want to view my work and correspond on it, you can visit me here at h..." | Read more » over 6 years ago
abdul "Well, I couldn't quite see how to edit the activity grid, but I'd put the stats as ready for testing, the difficult as very easy (assuming a scale ..." | Read more » over 6 years ago
abdul "Yes I'll add details " | Read more » over 6 years ago
abdul "What are the downsides of the acryllic like that? Cost is an obvious one, but besides that? Anything major? Could we have the acryllyc lengthened ..." | Read more » over 6 years ago
abdul "Hello, Would it be possible to show some zoomed out images at each step, and maybe give us some specifications of the box and such, just so that w..." | Read more » over 6 years ago