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 "Hi, @pablo - thought you might have thoughts on this, or maybe even design files to share? " | Read more » almost 6 years ago
rthalman "Ok, so here are the links to shapeways: Absorption Cell Body: https://www.shapeways.com/model/3dtools/5722864/0/123?key=0955c52c1c8596f6422b736ebda..." | Read more » almost 6 years ago
warren "Also see this one: https://publiclab.org/notes/briandegger/12-11-2015/silhouette-cut-public-lab-mobile-spectrometer-v2 -- though it's not too flesh..." | Read more » almost 6 years ago
warren "Wow, excellent! You can share a design on Shapeways by clicking "Edit product with this model" in the upper right: Then you can check "Offer for..." | Read more » almost 6 years ago
stef "@warren, @rthalman I will share the build details once I get some fotos. The public library operates on a cost recovery system so the cost of the p..." | Read more » almost 6 years ago
rthalman "@warren I have the .stl files in the description, you can upload those to Shapeways. In PLA on shapeways the absorption cell body costs $26; the Sp..." | Read more » almost 6 years ago
warren "Also, is it possible to order this print on Shapeways, do you think? I'd love to get one but don't have a 3d printer. Anyone want to try uploading ..." | Read more » almost 6 years ago
warren "This is so exciting to see. @stef, would you be willing to post a response using the "Document your attempt to build this" button above the builds ..." | Read more » almost 6 years ago
stef "@rthalman: Hey, I'm not complaining, your design got me going on the 3D printing thing. Insofar as to the Cam temperature, by turning off the autof..." | Read more » almost 6 years ago
rthalman "@stef Thanks for trying out my plans. I also found that the slit width that was printed was sub-optimal. I made a narrower slit with aluminum duct ..." | Read more » almost 6 years ago
stef "@rthalman, @warren I have replicated the design using the printer in my local library as well as the modification to the Life cam where I removed t..." | Read more » almost 6 years ago
warren "Yes, that sounds right. I think the remaining issue was that unfortunately it wasn't clear if the RPi camera can be accessed via the browser webcam..." | Read more » about 6 years ago
rthalman "Warren, looking at your post (and specifically the size of the camera you are referring to, you could easily interface that by just attaching it to..." | Read more » about 6 years ago
warren "Related question here: https://publiclab.org/notes/warren/09-28-2016/upgrade-a-diy-spectrometer-with-a-raspberry-pi-camera " | Read more » about 6 years ago
warren "Very interested to see this, kudos! We've had some difficulties finding standard ways to disable exposure compensation on webcams, and there's been..." | Read more » about 6 years ago
warren "Oh great! Do check out this node.js lib designed originally for work in a raspberry pi! https://github.com/publiclab/spectral-workbench.js " | Read more » about 6 years ago
xose "By the way, the research on the foldable spectrometer got a little bit delayed because of this. But just delayed ;D " | Read more » about 6 years ago
xose "Hey @warren It was a pleasure to assist to the inner workings of the lab and really great info to go on with the testings Definitely I'll post this..." | Read more » about 6 years ago
warren "Hello @xose! Very glad to meet you over audio today. I came across this: https://quitter.se/notice/8940101 And was very excited to see it -- woul..." | Read more » about 6 years ago
madeinussr "@madeinussr awards a barnstar to xose for their awesome contribution! " | Read more » about 6 years ago
xose "Impressive work warren!! Thanks!! " | Read more » about 6 years ago
warren "very cool! Also see the newer prototype I did a while back -- high hopes for it to be a bit more robust: https://publiclab.org/wiki/foldable-spec#U..." | Read more » about 6 years ago
warren "That's so cool! Thanks, please do -- " | Read more » about 6 years ago
xose "Hi there I've adapted the ink+hole upgrade to the foldable specrtrometer and think works pretty well. Ill post an upgrade with some test pictures o..." | Read more » about 6 years ago