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 | "Also noting that @ygzstc cited some work supporting the use of the area under the curve in a spectrum data reading instead of intensity at one wave..." | Read more » | about 7 years ago | |||
warren | "Just to clarify here, I believe to sum up we can say that: IF a reagent reacts linearly (for example, if doubling the concentration of the thing t..." | Read more » | about 7 years ago | |||
warren | "Copying in answer from @stoft, here: It is my understanding that Beer's law is not the relationship between reagent's effect on color, but is the ..." | Read more » | about 7 years ago | |||
warren | "Hi, all - i've been collecting up some info on reagents on this page; i'll repost my question and @stoft's answer there too: https://publiclab.org..." | Read more » | about 7 years ago | |||
cfastie | "That's a good question about the DVD plastic fluorescing. I don't know of anyone who has raised that question about the Public Lab spectrometers. I..." | Read more » | about 7 years ago | |||
warren | "Hi! Here's a good place to post questions about fluorescence: https://publiclab.org/wiki/oil-testing-kit#Questions Or, just at https://publiclab.o..." | Read more » | about 7 years ago | |||
warren | "Hi, there's been a lot of work on fluorescence and there's still a lot to do -- you can read up at #fluorescence - and on this page: https://publi..." | Read more » | about 7 years ago | |||
ICSK | "Does the diffraction slit that is offered also fluoresce? Any other thing I might not be thinking of for measuring fluorescent responses? Only par..." | Read more » | about 7 years ago | |||
warren | "There's some guidance and troubleshooting help here! https://publiclab.org/wiki/spectral-workbench-usage#Webcam+selection " | Read more » | about 7 years ago | |||
RPiach | "How do i get my computer to recognize my public lab spectrometer? I tried firefox, chrome and expolorer. I am using Windows 10 " | Read more » | about 7 years ago | |||
oglezsa | "Will do. Thank You. " | Read more » | about 7 years ago | |||
warren | "Yes, you should be able to -- the angles may change though! Tell us what happens when you do! " | Read more » | about 7 years ago | |||
amirberAgain | "Not sure I got exactly what you meant. Slit, Have you looked at the Acetate slits from the Public lab store? Alternatively, you can buy one from ..." | Read more » | about 7 years ago | |||
warren | "Hi, possibly also see this related question: https://publiclab.org/questions/jjoll/06-03-2017/can-a-spectrometer-be-used-to-detect-material-type " | Read more » | about 7 years ago | |||
warren | "Also see this related question: https://publiclab.org/questions/shaikhgous/11-18-2016/identify-plastic-material-using-infrared-imaging " | Read more » | about 7 years ago | |||
warren | "Hi, please contact kits@publiclab.org if you have a defective part! We're back up and running now and would love to get you a working camera, thanks. " | Read more » | about 7 years ago | |||
warren | "Yes, I think that's be great. I'm adding this as a "challenge" on the Spectrometry page, hope someone picks it up. Also see related: https://public..." | Read more » | about 7 years ago | |||
warren | "Also see this question on getting data off a Raspberry Pi via keyboard emulation: https://publiclab.org/questions/warren/04-29-2017/getting-a-raspb..." | Read more » | about 7 years ago | |||
KushalKC | "If there are apps for it, could you please name one of them. " | Read more » | about 7 years ago | |||
warren | "Hi, at least a couple years ago, I looked into this and it seemed there are ways with a custom app, but only on some Android phones. I'm not sure i..." | Read more » | about 7 years ago | |||
bsugar | "Just stumbled upon this in checking out the questions feature. Not sure if you've seen but there has been some prior work done in this area: http..." | Read more » | over 7 years ago | |||
gretchengehrke | "Hi @rajanzaveri, What sorts of concentrations and what media are you interested in measuring? Do you have more specific constraints for measurement..." | Read more » | over 7 years ago | |||
islenos | "Hi Rajan! I'd love to know if you were able to figure out how to measure these compounds using the spectrometer. We are looking to measure cadmium,..." | Read more » | over 7 years ago | |||
hppyromz | "We do not disclose your personal information to anyone, except in accordance with the Privacy Act. Authorized disclosures include limited circumsta..." | Read more » | over 7 years ago |