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
stef "@warren Thanks for your comments. Prior to the IR filter removal, I had no indication that there was a light transmission through the cover proble..." | Read more » over 6 years ago
stef "Done! " | Read more » over 6 years ago
warren "Also -- just reading this through carefully, and was wondering if the line: I used the pick on the back of the lens ...could be clarified -- you..." | Read more » over 6 years ago
warren "Also - do you have links to scans done with and without this light cover, in bright conditions, to show folks the advantage of additional light dam..." | Read more » over 6 years ago
warren "Great build photos - I've added the upgrade:dssk tag to indicate to people that this is an upgrade that can work on the desktop spectrometer, and t..." | Read more » over 6 years ago
stoft "Jeff, yes, the data is being collected, and yes, higher resolution does improve observation of detail like slit differences. I'm evolving some new ..." | Read more » over 6 years ago
warren "Thanks for the update, Dave - do you have comparative datasets to share on this, whether CSVs or links to Spectral Workbench? Just curious. I wonde..." | Read more » over 6 years ago
stef "Thanks for that tidbit. It is re-edited. " | Read more » over 6 years ago
warren "Sorry, next to the "follow" button: " | Read more » over 6 years ago
warren "Oh - you can edit using the little ^ menu next to the "LIKE" button. I agree the camera model is helpful, but i think it could be added under "What..." | Read more » over 6 years ago
stef "It probably would help to identify the camera better e.g. JDEPC-0V05 as shipped with the PLAB 3 spectrometer IR filter removal and Focusing. I thin..." | Read more » over 6 years ago
warren "Wow, this is so great! I wonder if it'd be helpful to people seeking to do this process too, if you were to rename it "Removing the infrared filter..." | Read more » over 6 years ago
stoft "Jeff...Actually, looking at the 'Unreinforced' 'Green' peak wavelength shift, the span is 537-549nm (the same peak in the 'reinforced' version is 5..." | Read more » over 6 years ago
warren "Just wanted to ping in here we did some stress tests last week based on the proposed tests @stoft made, and they're quite dramatic -- a 4-5nm shift..." | Read more » over 6 years ago
stoft "Thanks Jeff; understood. I'm presently working on a higher resolution P-4 spectrometers (including monochrome) so might find a spot for comparison ..." | Read more » over 6 years ago
warren "Also -- perhaps there could be a comparison of spectra with air gap vs. film gap... and to test your build, you might ask people to post a before/a..." | Read more » over 6 years ago
warren "I like this a lot! I'd try it out but I'm inclined (myself) to take things slowly -- I want to boost replications/builds on the other upgrades you'..." | Read more » over 6 years ago
stoft "@warren, I'm not sure I follow the linking details for grids etc., but more abstractly, a tree structure comes to mind. This note describes one com..." | Read more » over 6 years ago
warren "Alternatively -- we could consider a "replication" of each and every sub-upgrade to then constitute a replication of this larger set of changes, an..." | Read more » over 6 years ago
warren "This is such a big post, I'm wondering if we could continue (as our earlier upgrades start to see replications) to adapt multiple additional upgrad..." | Read more » over 6 years ago
warren "Hi, this is excellent, thanks! Would you be willing to post it as a "replication" using the button above: Document your attempt to build this ? Tha..." | Read more » over 6 years ago
stef "@warren This shows a metal 1/4-20 metal adapter for a tripod mount also addition of the rear 1.5X2 bulkhead with an indicator power on lead for t..." | Read more » over 6 years ago
warren "Wow, that's really cool. Would you be able to post some pictures of your stability upgrade as a response by clicking the button on the bottom of th..." | Read more » over 6 years ago
stef "@warren I have used an automotive type flat black rust paint which is available locally and comes as a spray can application or in a 237ml can for ..." | Read more » over 6 years ago