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, Abdul - I marked this as an activity for the DSSK; could you try adding detail about how long it takes to do, and how difficult it is? Thanks! " | Read more » over 6 years ago
dhaffnersr "Hello @abdul, ok, I thoroughly read through your post and your note also, about processing the DVD piece, I want to just start their for a minute, ..." | Read more » over 6 years ago
warren "Well, we're still working the tagging out in this thread: https://groups.google.com/d/msg/plots-infrared/8IYLt3rdw2w/k4EJPRx4DAAJ, but if you add i..." | Read more » over 6 years ago
abdul "Hey Jeff, Yeah, feel free to add any tag, I'm not as familiar with the formatting capabilities or standards typically used on the site. Regarding..." | Read more » over 6 years ago
warren "And just checking, maybe this could be marked as in-progress? Could we try a tag status:in-progress and could you add it to the new grid: https://p..." | Read more » over 6 years ago
warren "Hi, Abdul - this looks great; do you imagine we could offer the spec both with/without the wood piece? I know some people have wanted more rigidity..." | Read more » over 6 years ago
dhaffnersr " stoft, see, that's what I'm talking about, finding the work-around, that's actually a great idea and very cost effective. " | Read more » over 6 years ago
stoft "Yes, both aluminum and silver oxidize very rapidly which is why all mirrors with those surfaces are coated -- the type of coating affects the mirro..." | Read more » over 6 years ago
dhaffnersr " cristoforetti, oh yeah, that's perfectly fine I do the same thing when I build a prototype. I use some pretty unconventional material sometimes! " | Read more » over 6 years ago
cristoforetti "@dhaffnersr thank you for the reference. You are certainly right, my only point is that it will take some time to have an aluminum coated mirror, i..." | Read more » over 6 years ago
dhaffnersr "hey cristoforetti , I just wanted to give you some info on why you should be using the aluminum coated mirrors: Aluminum is also common used in m..." | Read more » over 6 years ago
cristoforetti "@stoft thank you very much for the clarification and suggestions. About 1) I am looking to use cars mirror, that should be front-surface mirrors. ..." | Read more » over 6 years ago
stoft "@cristoforetti, the camera focal distance is based on using a slit to simulate collimated light -- non-collimated light gives multiple diffraction ..." | Read more » over 6 years ago
dhaffnersr "Sounds good, the 3D printed prototype looks cool also! " | Read more » over 6 years ago
cristoforetti "Thanks dhaffnersr, that dimension shouldn't be a problem. Probably I will need to modify a bit the design, shifting the optics 5mm to the left sho..." | Read more » over 6 years ago
dhaffnersr "hey cristoforetti, my web cam's dimension's are 32mm X 32mm, so your project is pretty small I hope it will work, as far as the mirrors, if i were..." | Read more » over 6 years ago
cristoforetti "@dhaffnersr: assuming that the angles are right I think that it will be crucial to have good mirrors reflecting on a wide range of wavelengths with..." | Read more » over 6 years ago
dhaffnersr "This is certainly a very ambitious undertaking. 70X70mm that would be pretty amazing. " | Read more » over 6 years ago
warren "Really, almost there, I guess I must not have accounted for the loss of material by the laser, but it needs to be 1/16 inch taller and wider. Maybe..." | Read more » over 6 years ago
warren "OK, done! I just replaced the original file. " | Read more » almost 7 years ago
warren "Ugh, i must've made some mistakes in unit conversions, and it came out quite wrong. Here's a new version, more carefully measured: spec-housing-2..." | Read more » almost 7 years ago
warren "Ponoko requested that I don't let cut lines overlap, so I adjusted the cut file: spec-housing-2.1-24x12.pdf spec-housing-2.1-24x12.svg " | Read more » almost 7 years ago
warren "I like the screw-in-the-base option, but I also wonder if good coverage of strong double-sided tape is a choice we can offer too. Good thoughts; I'..." | Read more » almost 7 years ago
stoft "Just checking .... what is the mechanical relationship between the dimensions of the paper module and the inside dimensions of the laser-cut cover?..." | Read more » almost 7 years ago