M Pang

Check out some of the fun things we've been up to at @OpenAeros in our latest update :) youtube.com/watch?v=R_P0gM…

@PeteUK7 @drclairetaylor @_MYLUMENS @EwanEadie @TheOSLUVProject 4) There are even unit to unit variances in the 1m center irradiance 15% between two identical units of the same product from the same manufacturer (note different dates and catalog numbers)

@PeteUK7 @drclairetaylor @_MYLUMENS @EwanEadie @TheOSLUVProject 3) For the UK you want to use IEC 62471-6 / ICNIRP limits. You can set this is @TheOSLUVProject 's illuminate . It's very beta and a little slow (but works well) so pardon the dust :)

Product review: Mysoter® UV Plus222 I was asked by @_MYLUMENS to have a look at their Far UVC spotlight. Proven to reduce ALL known viruses & bacteria in the air & on surfaces Here are my views of the device, starting with a video. There are also special discount codes. 1/🧵

Example : bit.ly/3VQEJMt . Feedback welcome 🙂

So @vivian_belenky and OSLUV developed a free and open tool to calculate how safe and effective 222nm GUV systems are. Check out the (beta) tool at illuminate.osluv.org . Define a room -> add, place, and aim the lamps -> calculate safety and efficacy to your hearts content🙂

@chrisgj198 @OpenAeros @masknerd @chrisgj198 The repos are still being worked on but the electrical CAD files are technically online if you look ;)

@mpangch @OpenAeros @masknerd Still really looking forward to this!

Almost 2 years ago (Dec 27, 2021) - I sent @masknerd an email suggesting that we develop an open source condensation particle counter (CPC) to enable low cost and accessible air quality monitoring and quantitative fit testing for all. He said yes and we founded @OpenAeros.

@dmitrygr IFD shot not clear enough to see ground speed and altitude to calculate time dilation . pls rectify

This is my Time Machine. I needed to be in Dallas today. Driving is 3h+, commercial flight time is dwarfed by the clown-show that is the TSA. 57 minutes door to door.

@NukitToBeSure @2b_technologies @jljcolorado Another thing is sampling point - per UL 867/UL 2998 - sampling is done 2 inches from the front of the device -O3 will be very high (10-20ppb) in this location (where its most conc due to light and 1/r2 decay) . For this reason 222nm UV can't pass UL 2998. (3/N)

@NukitToBeSure @2b_technologies @jljcolorado USHIO B1 - 120mW UV in a 12x12x10 unmodified office raised O3 from < 1 ppb to ~2ppb. 3 X B1 raised it to 5.3 ppb. 4 x Nukits have combind ~100mW (full battery) decreasing linearly to ~60 mW of UV as battery discharges . Should see similar (or smaller) ~1 ppb increase (2/N)

Fancy (and very, very expensive) American-made super-accurate ozone meter I got from @2b_technologies on the recommendation of @jljcolorado. Going to get to work on the Far-UVC ozone issue and see what kind of ventilation we need to specify🤓 2btech.io/items/ambient-…

@NukitToBeSure @ghhughes @antiviral_mktng @masknerd @OpenAeros I wouldn't say it's easy to build for a home DIY maker, I will say I'm fairly sure @NukitToBeSure could build it with some finagling and considering SZ is your home ground :) Initial version is a R&D device, more versions to follow :)

@NukitToBeSure @ghhughes @antiviral_mktng @masknerd @OpenAeros <3 Thank you for the love and explanation - even though sometimes we disagree about things, it means the world when others recognize the work for what it is. Hoping to drop HW + SW on git by the end of the month probably a CERN OSHW license. We are in DFM as you rightly said.

Aaron Collins and his @OpenAeros are working to reduce the cost of mask fit testing and aerosol science. They are close to a finalized design for a sub-micron particle counter that will be free to copy, and much cheaper to manufacture than current designs.

It’s been a long road but we are so excited to share our progress on the world’s first open source, low-cost, condensation particle counter! What is it and why should you care? @masknerd explains why this CPC is a BFD. youtu.be/OxQSAvvOpw4

@chrisgj198 @OpenAeros @masknerd We are actively working on staging files for first open source release which will happen soon :)

@mpangch @OpenAeros @masknerd Since it is open source, it would be great if you could please release design files soon (in its present state) - the downsides I see: 1. You getting lots of questions, and 2. People expecting software support to include early revisions instead of just the final released version.

@WildPersistence @masknerd @OpenAeros We are working on some ideas along this line for the NIOSH fit test challenge :)

@SusanDavidsonM2 @Gee24218071 @OpenAeros @masknerd Inlet airflow is passed into warm chamber w/ a isopropanol wick - saturating it with IPA fluid then it goes into a chamber at 15C which causes fluid to condense on particles making them bigger :) Response time is v. fast - seconds.

@mpangch @Gee24218071 @OpenAeros @masknerd What is the sensor response time? Took a gander at the website, curious about the "growth" mechanism.

@ericbkennedy @OpenAeros @masknerd openaeros.com/opencpc there is a sign up on the bottom right of our website :)

@jeffgilchrist @masknerd @OpenAeros Yep - that's the plan! Current version is hand made & intended for scientific/industry research community to independently study / verify / develop OpenCPC. We are already 10x - 20x cheaper than our competitive benchmark. The next 5x-10x will need scale - we are hard at work :)

@mpangch @masknerd @OpenAeros Thank you for the update. Hopefully with scale and manufacturing design, the cost can get a lot lower since $2500 is not "low cost" in my mind, although I appreciate it is lower than what current new CPCs cost. I was hoping they could be acquired for neighbourhood support.