Spectrometry
upgrade:spectrometry

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 "For the L-shaped part in figure 5, I'm curious to hear @stoft's input - I'd like to see some kind of more rigid connection between the piece that h..." | Read more » over 7 years ago
warren "Hi, Yagiz! Awesome. Can you share some dimensions of the DVD holding part so we could come up with a vector design to add to the repository? https:..." | Read more » over 7 years ago
liz "This is an amazing contribution. Thank you! " | Read more » almost 8 years ago
stoft "You might then also consider a u-ch shape for the camera block. That would nicely control the exact spacing between camera and DVD which is importa..." | Read more » almost 8 years ago
mathew "I was thinking along the lines of a U-channel. Drilling takes a lot of setup and if we could use a Dado blade or a router it would go fast. We get..." | Read more » almost 8 years ago
stoft "1/4-in thick pieces make it easy to assemble things square and the glue results are strong. Hardwood is rigid and handles machining better. I start..." | Read more » almost 8 years ago
mathew "I'm going to look at pricing these wooden blocks and see if we can integrate these changes into the kit in the next 12 weeks or so. Getting circu..." | Read more » almost 8 years ago
Guillaume123 "An excellent technical note. I have just read it once, but I shall have to read it again to get a fuller appreciation of the contents. Guilelmis123 " | Read more » almost 8 years ago
warren "Sunwukong - I would love to see a pic of your setup; is it connected to a telescope? " | Read more » about 9 years ago
cfastie "Sunwukong, You can download the data from any spectrum at SpectralWorkbench.org. So at this page for one of the nicer CFL spectra from Ebert, you c..." | Read more » about 9 years ago
sunwukong "Do you have a data source for the intensity, pixl, wave length for the CFL in this image. Pictures are beautiful. I have a similar setup using so..." | Read more » about 9 years ago
cfastie "Hi Spectralod, Your long tube CFL spectrum is calibrated correctly. I am not sure why you are not getting more distinct peaks with regions between ..." | Read more » almost 10 years ago
spectralod "I should have also said that I don't understand this website. It's all over the place. Is there one of those standardized forums you could use inst..." | Read more » almost 10 years ago
spectralod "How do you calibrate anything? I haven't figured this out yet. I don't have 3 blue wavelengths to choose from...I don't know which other green wave..." | Read more » almost 10 years ago
Tom_H "Chris, I also noticed the 405nm line was all but absent in your spectrum, and that is one reason I brought up my previous experience. I came acros..." | Read more » almost 10 years ago
cfastie "Tom, How did the CFL lines drop off in your earlier spectra? I have noticed that my spectral images taken with P&S and DSLR cameras do not reco..." | Read more » almost 10 years ago
Tom_H "Chris, How did you overlay the spectral image on the Excel graph? There is another way to extract data from the camera image: Use a software that..." | Read more » almost 10 years ago
Tom_H "Good job. I am inspired to work on a similar project. I love the way you recycle what most see as junk! A man after my own heart. I made a spect..." | Read more » almost 10 years ago
warren "Wow, i did not regret that. " | Read more » almost 10 years ago
cfastie "You tell me. " | Read more » almost 10 years ago
warren "If i watch the video, will I know why the post is named "Ebert"? " | Read more » almost 10 years ago
straylight "rather nice. I need to lift my game ! :) " | Read more » almost 10 years ago
gonzoearth "It looks awesome. I look forward to trying lots of these tweaks! " | Read more » almost 10 years ago