Spectrometry
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
amirberAgain "Can you measure pure water? Probably so! While largely transparent in the visible water absorb in the 700-850nm range, note that to image in that r..." | Read more » over 6 years ago
thangvu "I have no solution for multi-wavelength source like a spectrometer. I will try with another wavelength. " | Read more » over 6 years ago
thangvu "Thanks for your answer, I have the standard solution of 5-10-20..70 pt / cb (I borrowed), according to the standard method, when measured at 430nm,..." | Read more » over 6 years ago
Ag8n "Do you know what APHA values you will be observing? I was typically observing values under 25. And yes, a florescent light was very helpful again..." | Read more » over 6 years ago
Ag8n "If you used the right lamp, you would be ok. You need to use a broadband source, as stoft noted. " | Read more » over 6 years ago
thangvu "My idea is to use a 430nm wavelength to measure the color of the water, so, I use a 430nm (+ - 10nm) led as the source, but the 430nm led seems to ..." | Read more » over 6 years ago
thangvu "sorry for saying it is unclear, with wastewater, the color of the water partly assesses the level of water pollution. " | Read more » over 6 years ago
stoft "Depending on what information is needed from the spectrum (i.e. like the entire available spectrum, using a CLF will not be useful. A broadband sou..." | Read more » over 6 years ago
thangvu "Thanks for your helpful answers " | Read more » over 6 years ago
Ag8n "Try to avoid using blue water solutions, at least without doing some testing. The compact florescent lamps (CFL) loose intensity at the blue and o..." | Read more » over 6 years ago
Ag8n "Yes, it can. You need to go to the spectrometer page for more information. It will show how to set up cuvette s to hold water and what to use as ..." | Read more » over 6 years ago
MoparWade "So, I didn’t receive the black piece of cardboard. No big deal I can work with that. What is a problem is that I cannot see any way to connect the ..." | Read more » over 6 years ago
briandegger "Maybe colour of liquid compared to distilled water/plain iron water. Qn example: Dissolved tannins give water a brown hue. " | Read more » over 6 years ago
stoft "Since H2O is a colorless fluid, 'color' appears not to be the correct intent of the question. The author would need to clarify the objective. " | Read more » over 6 years ago
omarormachea "Dear @TeacherHelen, you can use the following free software created for android platforms, you can get information about it, from the calibration a..." | Read more » over 6 years ago
Bronwen "Hi @TeacherHelen, nice to meet you! The Papercraft Spectrometer wiki is a good place to start. There you will find links to instructions for calibr..." | Read more » over 6 years ago
Ag8n "Call them on the phone and talk to their salesman. Talk to tech services of you have to, but sales is usually better. A word of warning, the sale..." | Read more » over 6 years ago
MarcioPamplona "Yes, i'm aware of the technologies. I want to develop a sensor, using NIR spectometry to measure the moisture level and characterize wood chips. L..." | Read more » over 6 years ago
warren "Hi, all - i believe I've fully recovered this post -- apologies for the database problem over the weekend. Please tell me if things aren't working ..." | Read more » over 6 years ago
Ag8n "That's a lot of money. Nir is using overtones of IR bands. So you might be able to get by with something like atr with an IR. Just can't see that..." | Read more » over 6 years ago
JSummers "Hi @MarcioPamplona, Step one is to figure out where the absorbance shows up. By that I mean the wavelength that you need to detect. Googling "woo..." | Read more » over 6 years ago
MadTinker "There are a number of publications in this area because of the increased use of renewables (e.g. wood) for heating and the increased fire danger th..." | Read more » over 6 years ago
cfastie "Wood moisture content is commonly measured at different points in the process of turning trees into finished wood products. Many wood moisture mete..." | Read more » over 6 years ago
Ag8n "Frequently, in agriculture, near infra-red (NIR) is used, often for grain ananysis. One item is moisture. They will change the amount the farmer ..." | Read more » over 6 years ago