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
kgradow1 "Could you use a laser pointer and still go through the same workflow with @cfastie's reference image? I'm not sure if the peaks would line up, th..." | Read more » about 4 years ago
liz "Hi Damian, Sorry to hear of this trouble! Tomorrow, and every Tuesday at 3pm ET / 7pm GMT, find us on the video link listed at the top of: https://..." | Read more » about 4 years ago
theodoreeugene779 "Dear Madam / Sir. We, OOO "KULIGINSKOE LIMITED LIABILITY COMPANY As a Re-Seller company and a representative to a major refinery in Russian Federat..." | Read more » about 4 years ago
sound "Hi thanks Stevie. I was thinking like commercial spectrometers consist of a sample holder for solids at an angle or one can put the solid sample at..." | Read more » over 4 years ago
stevie "Hi! I don't know of a way to work with solid samples except if you can safely dissolve them in liquids. For example, here's a piece on dissolving u..." | Read more » over 4 years ago
david_uwi " SPEC2018-2-.bmp This is the circuit diagram " | Read more » over 4 years ago
yaina "nice information " | Read more » over 4 years ago
TC1994 "Hi @jenjimah, thank you so much for sharing your work. I have a question, did this final assembly manage to get the functionalities you set out to ..." | Read more » over 4 years ago
yp1080030 "Note Work Computer CLICK HERE " | Read more » over 4 years ago
shubhankar "Congratulation!! really helpful article. We bookmark this article for future reference. We are digital marketing agency. Our website is mysocialmed..." | Read more » over 4 years ago
mybestdslr33 "it was very good deal to encourage the children.we hope they learnt more.your job is fantastic you did very affordable work,your effort is very hig..." | Read more » over 4 years ago
Adviksoft "Children had the occasion to use DIY tools to observe and investigate an issue that matters a lot to them. " | Read more » over 4 years ago
craftpk "Thanks, Srnec i found it " | Read more » over 4 years ago
srnec "Standalone software was also missing for me, so I created one. You can download here: https://lpuws.scot.sk/ screenshot: https://lpuws.scot.sk/lpuw..." | Read more » over 4 years ago
rrajbhar754 "Very nice post. " | Read more » over 4 years ago
jevs "I cannot find anything lower than 2700K, so I am going to order a 5W 2700K...hope it works out. " | Read more » over 4 years ago
jevs "Apparently a capital F and a lowercase f mean something different. I changed my post to a lowercase f=3.85mm. Apparently f is focal length and F is..." | Read more » over 4 years ago
stef "there may be some answers for you in the research notes produced by @Stoft and @Warren on the topic of camera's native resolution and optics as a ..." | Read more » over 4 years ago
familysimon "@win215 Thank you for your input, I just received the grating slides and I'll dismantle a DVD or two and do a comparison when I finish the spectrom..." | Read more » over 4 years ago
wln215 "So I think I can be of some help here, I use these gratings in my spectrometer. They are cheap, and consistent, but a little fragile. I keep a stac..." | Read more » over 4 years ago
liz "Hi @familysimon! Glad you are finding a diffraction grating that you like. Maybe for fun sometime you can cut up an old DVD and see how that goes f..." | Read more » over 4 years ago
ananyo2012 "Warm water with soap just worked fine for me. " | Read more » almost 5 years ago
ananyo2012 "Duct tape or plastic tape works well for removing the aluminium coating. But just be careful that the adhesive from the tape doesn't stick to the p..." | Read more » almost 5 years ago
ishakore32 "Thanks for great info. [ How_to_loose_weight_without_gym_.pdf more](https://www.blogwithisha.blogspot.com/) " | Read more » almost 5 years ago