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. &gt; **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&amp;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) &gt; 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 "It's going to be$16.20, which is expensive for a cut but cheap for a prototype :-) Transparent acrylic (although I could use matte black at 22.70..." | Read more » almost 7 years ago
warren "I'm going to try getting it lasercut at http://www.ponoko.com/ -- in part to test if Ponoko is a service others could use for prototyping lasercut ..." | Read more » almost 7 years ago
warren "I like the idea of side holes for different types of spectrometry! The flap is to hold something like a leaf against the window so it's flat, and ..." | Read more » almost 7 years ago
stoft "I'm not following the flap bit. Why does the spectrometer need to be blocked? Also, from some simple experiements, I found that I needed much much ..." | Read more » almost 7 years ago
warren "I'm also interested in how this rigid frame allowed for additional scanning or sampling apparatus, for example for reflectance measurements off of ..." | Read more » almost 7 years ago
warren "Good idea -- here's an updated version with small screw or bolt holes: spectrometer-housing-2.svg spectrometer-housing-2.pdf " | Read more » almost 7 years ago
stoft "Clever; only 2 part types. Since the internal components are still merely "trapped" by the paper housing, you might consider adding a couple holes ..." | Read more » almost 7 years ago
stoft "Interesting thought, but the camera is (ideally) focused on the slit so adding a second one next to the lens would be out of focus; though maybe if..." | Read more » almost 7 years ago
viechdokter "Sounds great so far. One question: if you put a second slit right in front of the grating/webcam subset - wouldn't the light be even more parallel? " | Read more » almost 7 years ago
warren "More assembly innovations and simplifications; new note and design coming soon: " | Read more » almost 7 years ago
warren "Made the last couple changes -- flipped the tab holes on the bottom flaps, rounded the side bottom flaps: cuvette-frame-9.pdf " | Read more » almost 7 years ago
warren "Another update with the tuck-in flaps, slits, and the USB hole and the indexing hole for the potentiometer (although that may be premature). The de..." | Read more » almost 7 years ago
dhaffnersr "That is just too cool Jeff! " | Read more » about 7 years ago
warren "Just notes to self; i want to: make the top hole with a swinging flap, for light control redesign the stack to incorporate the LED, Trinket, and ..." | Read more » about 7 years ago
warren "I tried cutting the new version and it worked pretty well: I worked to insert the LED (which could be a laser diode) dial, and Trinket (arduino ..." | Read more » about 7 years ago
dhaffnersr "That's ok, I'm going to try it out anyway. I think this will work for what I am thinking, I am going to mount it in a plastic utility enclosure and..." | Read more » about 7 years ago
warren "I think it will be! But its designed to fit on the 3.0 spectrometry kit, and I think you have the 2.5, no? " | Read more » about 7 years ago
dhaffnersr "Hey Warren, I downloaded the pdf cuvette frame design and I was wondering if I print it out will it be to scale so I can use it as a template? " | Read more » about 7 years ago
stoft "Gretchen, thanks for the insight. I'd read that the generally broad fluorescence spectrum is, as would be expected, a combination of many spectral..." | Read more » about 7 years ago
gretchengehrke "This is a really great post, Dave! As for the concentration effects, in addition to quenching, there is also shielding, and there can be another p..." | Read more » about 7 years ago
stoft "I just ran some new calculations looking at the curves from my existing data and found a possible correlation between oil density and the centroid ..." | Read more » about 7 years ago
stoft "Jeff, thanks. 1 - Yes, you are right, there is a "glow" from EVO. However, that peak is small and out at 650nm past where it has little effect. I ..." | Read more » about 7 years ago
warren " "visually differentiate between the five (5) test samples" - here, you mean based on qualitative visual inspection of the graphs, right? Do you be..." | Read more » about 7 years ago
warren "This is super, and very impressive, Dave. I have a number of comments/questions, but I'll start with just a few: I'm very surprised to hear that ..." | Read more » about 7 years ago