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 | ||
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warren | "Regarding a baffle, I wonder if we could just repurpose the paper structure that was holding the DVD, after upgrading with wood blocks: " | Read more » | almost 8 years ago | |||
warren | "I tried using similar ink to paint the inside, and it works pretty darn well; I'm thinking of posting it as an easy upgrade! Update: I posted this..." | Read more » | almost 8 years ago | |||
stoft | "@abdul, ok so we've just differentiated the [1] and [2] kits; the option [1] should ship thin, paper only with no 'solid' materials other than the ..." | Read more » | almost 8 years ago | |||
abdul | "Excellent stuff there @stoft youre definitely picking up what Im throwing down. So, regarding customer feedback unfortunately weve been prohibited..." | Read more » | almost 8 years ago | |||
stoft | "Interesting thought. I'll suggest using blue and red LEDs which then allows monitoring apparent wavelength shifts as well (when slit and camera or ..." | Read more » | almost 8 years ago | |||
stoft | "@abdul, interesting observations .... so here's a starter list. [0] Folding Vers (Cute, zero-cost, spectrum concept), [1] Paper Vers (Functional, l..." | Read more » | almost 8 years ago | |||
warren | "I also wanted to link back to this idea of monitoring the green peaks over a period of time: As to how to measure this, I'd suggest a real-time di..." | Read more » | almost 8 years ago | |||
warren | "I also wanted to link back to this idea of monitoring the green peaks over a period of time: As to how to measure this, I'd suggest a real-time di..." | Read more » | almost 8 years ago | |||
abdul | "I think that the foldable smartphone spectrometer's huge sales provides evidence that there is robust demand for level 0 spectrometers and that the..." | Read more » | almost 8 years ago | |||
m3sca1 | "After having a look at the 2 different products I decided to go with the carbon filter for the soldering fume extraction. It is more black than the..." | Read more » | almost 8 years ago | |||
leanr | "I just got a CCD 1/3" and an optic megapixel f8 mm 1:1,4 and a grabster AV300, I just need to connect it to the metascop, and find the software... " | Read more » | almost 8 years ago | |||
m3sca1 | "I have been considering this too, and am looking seriously at carbon covered sponge that we have at work. We sell it in 2 products. One is for sold..." | Read more » | almost 8 years ago | |||
warren | "There are now some upgrade proposals for more rigid internals: https://publiclab.org/notes/stoft/09-16-2016/stability-upgrade-mockup-for-plab-spect..." | Read more » | almost 8 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 » | almost 8 years ago | |||
stoft | "@mathew, good thoughts. I'm technical but from experience I see the need to include the market, user, next-bench, test, manufacturability, environm..." | Read more » | almost 8 years ago | |||
mathew | "I'm personally reticent to begin prototyping hardware-- or even sketching it-- before defining the goals and test environment. For me, the existen..." | Read more » | almost 8 years ago | |||
stoft | "@stef, Thanks for your observations; glad to see the creative spirit alive and well. Here's a link to a note (which includes two other links) about..." | Read more » | almost 8 years ago | |||
stef | "Having built the DSSK 3 and experiencing utter frustration with it the minimum for me is the wood platform as per the upgrades with additional modi..." | Read more » | almost 8 years ago | |||
m3sca1 | "Hi Warren, Thanks for your concern-the carbon arc you show in that video is quite a bit larger than what I had in mind but yes that sort of spark g..." | Read more » | almost 8 years ago | |||
warren | "Hi, this seems like it could be dangerous, and I don't know much about it. But are you talking about this: https://publiclab.org/notes/bwilliams/10..." | Read more » | almost 8 years ago | |||
stoft | "I added a comment; I think that at this abstract level, the assumption of conceptual mode is fairly implicit. The entire post is focused on proposi..." | Read more » | almost 8 years ago | |||
warren | "Hi, Dave - I like this -- maybe "Materials" could become "Suggested materials" since people may get creative there -- from, say, cast resins, to wh..." | Read more » | almost 8 years ago | |||
abdul | "@Georgi did you ever end up changing the camera? Can you tell us about your experience?? We are always open to improving our hardware and would lov..." | Read more » | almost 8 years ago | |||
abdul | "@warren is there a chance to write a note about using a raspberry pi and post it as a build? I think others have had interest about this. Did we al..." | Read more » | almost 8 years ago |