Good job. Two recommendations are: 1. Add an interlock that shuts off the light when the door opens, which will protect your eyes and skin from stray UV-C rays; 2. Line the box's interior with aluminum foil or another reflective surface to increase the device's efficiency and coverage area. Would it be possible to list the sources of the bulbs, dosage cards, etc?
@@sokhadombun4858 There is a small magnetic interlock switch that's available (ruclips.net/video/g8KGE3oSyXQ/видео.html). However, all that is needed is a small, simple contact switch that can be found at a hardware store, electronics store or hobby shop (www.newark.com/seco-larm/sm-205q-w/product-range-miniature-surface/dp/13T5794?gclid=CjwKCAjw5p_8BRBUEiwAPpJO6wzz7gMpT0T2N94zmKAilyNnS1ctnXUxH7O73md1evwDElTWpfinFRoCCRIQAvD_BwE&mckv=s9S4oChJl_dm|pcrid|434136793581|plid||kword||match||slid||product|13T5794|pgrid|100464452146|ptaid|pla-903899721538|&CMP=KNC-GUSA-GEN-Shopping-NewStructure-Security).
Great Job! Thank you for the best demo, (with the most explanation delivered in a clear manner,) on UVC and elimination of "bugs" that I have been able to find online!
How come you can just open the box without gloves (left hand has no glove) and special glasses when they say you have to stay away from those uv-c lights and operate them remotely?
You could install a cutoff switch so that when the flag on the mailbox is raised, the UV light comes on, and when it is lowered it goes off. Put an interlocking switch on the door, and you are set.
Hello, how are you there? Congratulations! I am building a similar project here in Brazil. In relation to yours, I noticed that you are using glass or some transparent material to serve as a surface... The problem with this is that except Quartz, everything is opaque and absorbs the UV-C wave. Another thing, one of the best materials to reflect this wavelength is aluminum foil. I will share a step by step using recyclable materials for everyone as soon as I finish here.
You are right about the glass. I was thinking the same thing. I am making a box to sterilize my daughters shoes. She is a nurse in the intensive care unit. All insides of the box have aluminum foil and I am using thin steel wire webbing to suspend the shoes (a guitar's 1st E string will work) as a compromise.
I had the exact same question when I was building a similar setup, so I did some research and wrote a paper on it! www.researchgate.net/publication/340964255_Estimating_UV-C_Sterilization_Dosage_for_COVID-19_Pandemic_Mitigation_Efforts What I found was that you can calculate approximate exposure time in minutes with this equation: t = 25000*pi*(r^2/P). r is the distance (in meters) from the bulb to the object, and P is the bulb wattage. This approximation is specifically for COVID-19.
Here's a dumb question. Because it's measuring dosage in watt/cm^2 does that mean even if you had a lower powered UVC light you'd just want to expose whatever your sanitizing for a longer period of time to up the dose? I have what I think is an 8watt fluorescent lamp and I was worried that perhaps it's not strong enough. But if a lower emission just means leave it in there longer then I won't be worried. Hopefully, that makes sense.
You're absolutely right. You can increase dosage for lower powered bulbs by leaving it on for longer periods of time. For COVID-19 applications, I did some research and found that you can calculate approximate exposure time in minutes with this equation: t = 25000*pi*(r^2/P), where r is the distance (in meters) from the bulb to the object, and P is the bulb wattage. This approximation is specifically for COVID-19. So for your 8W UV-C bulb (and let's assume that the bulb is 6 inches or 0.15 meters away from the object), solving the equation would give t = 220 minutes (4 hours). And if you take a closer look at that equation, you'd see that distance makes a bigger difference than the bulb wattage. So sticking the bulb closer to the object should increase the effectiveness of your system over shorter periods of time. Here's a link to a paper I wrote which explains how I got to this approximation: www.researchgate.net/publication/340964255_Estimating_UV-C_Sterilization_Dosage_for_COVID-19_Pandemic_Mitigation_Efforts. I hope you find it helpful.
@@paoloarguelles3693 I'm having some trouble with the math above. (.15*2/8) comes out to (.0375) i think thus t=25000*3.14*.0375 means t=2943 Seconds or 49 minutes ??
@@paoloarguelles3693 So what voltage do you recommend when using a box like this? I'm planning to build one to disinfect my n95 masks. I've seen so many videos on here of people just handling the lamps like if there's no risk whatsoever and in turn giving people this false sense of security. The company I bought a lamp from made a point to tell me that I need to make sure to wear UV blocking eye glasses and cover your skin because of the possibility of burns and damage to the eyes. One guy even mentioned losing his vision for a couple days because of not wearing those glasses.
UV-C light is not supposed to be able to go through plastic or glass. Are you using a plastic shelf? You show in the video exposing your bare hand to the light?
Hello, do you have any diagram on "how to do the UVC-sensor"? I'm working on a company that produce simple UVC boxes and it cood be cool to put this kind f sensor inside our device. Thanks
There are 3 types of UV radiation. UVA, UVB, UVC. UVC causes damage in DNA, thus destroy's the viruses ability to reproduce. However it does the same damage to human DNA, so people should not play with UVC, unless properly equipped.
Good job. Two recommendations are: 1. Add an interlock that shuts off the light when the door opens, which will protect your eyes and skin from stray UV-C rays; 2. Line the box's interior with aluminum foil or another reflective surface to increase the device's efficiency and coverage area.
Would it be possible to list the sources of the bulbs, dosage cards, etc?
uvcdosimeters.com/uvc-100-dosimeter/ That help?
how would you go about adding the interlock to a small project like these? also, could you maybe list one possible link that is low cost?
@@Orchardman53 Thanks.
@@sokhadombun4858 There is a small magnetic interlock switch that's available (ruclips.net/video/g8KGE3oSyXQ/видео.html). However, all that is needed is a small, simple contact switch that can be found at a hardware store, electronics store or hobby shop (www.newark.com/seco-larm/sm-205q-w/product-range-miniature-surface/dp/13T5794?gclid=CjwKCAjw5p_8BRBUEiwAPpJO6wzz7gMpT0T2N94zmKAilyNnS1ctnXUxH7O73md1evwDElTWpfinFRoCCRIQAvD_BwE&mckv=s9S4oChJl_dm|pcrid|434136793581|plid||kword||match||slid||product|13T5794|pgrid|100464452146|ptaid|pla-903899721538|&CMP=KNC-GUSA-GEN-Shopping-NewStructure-Security).
Great Job! Thank you for the best demo, (with the most explanation delivered in a clear manner,) on UVC and elimination of "bugs" that I have been able to find online!
How did you power the light? are you running the light continuously or only when activated?
What wattage uvc bulb are you using for your mailbox?
May be 11w
I want one, I living in Miami, How much it is?
very nice, please let me knkw how we can measure by device, i mean which device you have used ?
How come you can just open the box without gloves (left hand has no glove) and special glasses when they say you have to stay away from those uv-c lights and operate them remotely?
You could install a cutoff switch so that when the flag on the mailbox is raised, the UV light comes on, and when it is lowered it goes off. Put an interlocking switch on the door, and you are set.
We need to disinfect both sides right?
What if we use 2 uvc lights above and under?
Is it tested in the laboratory against Coronavirus before and after UV C Sterilization
which sensor do you use ? from where we can buy it ?
good concept.. What is source of UV rays ?are these doped glass lamps or some UV leds cluster bank with heatsink..
Hello, how are you there?
Congratulations! I am building a similar project here in Brazil.
In relation to yours, I noticed that you are using glass or some transparent material to serve as a surface... The problem with this is that except Quartz, everything is opaque and absorbs the UV-C wave. Another thing, one of the best materials to reflect this wavelength is aluminum foil. I will share a step by step using recyclable materials for everyone as soon as I finish here.
You are right about the glass. I was thinking the same thing. I am making a box to sterilize my daughters shoes. She is a nurse in the intensive care unit. All insides of the box have aluminum foil and I am using thin steel wire webbing to suspend the shoes (a guitar's 1st E string will work) as a compromise.
What is the wattage of the light that you are using?
Great video!, have you tried it on money, does the UV-C burn the bills?
Where can I find the equations to calculate need irradiation time for a setup?
I had the exact same question when I was building a similar setup, so I did some research and wrote a paper on it!
www.researchgate.net/publication/340964255_Estimating_UV-C_Sterilization_Dosage_for_COVID-19_Pandemic_Mitigation_Efforts
What I found was that you can calculate approximate exposure time in minutes with this equation: t = 25000*pi*(r^2/P). r is the distance (in meters) from the bulb to the object, and P is the bulb wattage. This approximation is specifically for COVID-19.
How would I know the germs or virus is neutralized?
Cool make UVC light in latter mailbox look like tanning bed
Here's a dumb question. Because it's measuring dosage in watt/cm^2 does that mean even if you had a lower powered UVC light you'd just want to expose whatever your sanitizing for a longer period of time to up the dose? I have what I think is an 8watt fluorescent lamp and I was worried that perhaps it's not strong enough. But if a lower emission just means leave it in there longer then I won't be worried. Hopefully, that makes sense.
You're absolutely right. You can increase dosage for lower powered bulbs by leaving it on for longer periods of time.
For COVID-19 applications, I did some research and found that you can calculate approximate exposure time in minutes with this equation: t = 25000*pi*(r^2/P), where r is the distance (in meters) from the bulb to the object, and P is the bulb wattage. This approximation is specifically for COVID-19. So for your 8W UV-C bulb (and let's assume that the bulb is 6 inches or 0.15 meters away from the object), solving the equation would give t = 220 minutes (4 hours).
And if you take a closer look at that equation, you'd see that distance makes a bigger difference than the bulb wattage. So sticking the bulb closer to the object should increase the effectiveness of your system over shorter periods of time.
Here's a link to a paper I wrote which explains how I got to this approximation: www.researchgate.net/publication/340964255_Estimating_UV-C_Sterilization_Dosage_for_COVID-19_Pandemic_Mitigation_Efforts. I hope you find it helpful.
@@paoloarguelles3693 I'm having some trouble with the math above. (.15*2/8) comes out to (.0375) i think thus t=25000*3.14*.0375 means t=2943 Seconds or 49 minutes ??
@@paoloarguelles3693 So what voltage do you recommend when using a box like this? I'm planning to build one to disinfect my n95 masks. I've seen so many videos on here of people just handling the lamps like if there's no risk whatsoever and in turn giving people this false sense of security. The company I bought a lamp from made a point to tell me that I need to make sure to wear UV blocking eye glasses and cover your skin because of the possibility of burns and damage to the eyes. One guy even mentioned losing his vision for a couple days because of not wearing those glasses.
UV-C light is not supposed to be able to go through plastic or glass. Are you using a plastic shelf? You show in the video exposing your bare hand to the light?
No parts list or build instructions (a disclaimer is obvious)?
I wonder if long term use of the UV light would actually cause damage to the phone itself, such as camera?
AiGalaxyS I try to sanitized our n95 mask from work, all rubber parts shriek and breaks easily...
Is the plate made of quartz glass? UVC can not go through plastic.
Right
Hello, do you have any diagram on "how to do the UVC-sensor"? I'm working on a company that produce simple UVC boxes and it cood be cool to put this kind f sensor inside our device. Thanks
Nicolas BRCSA hi nicolas for more info www.livethesmartlife.com i want to share with u my experiance👍🏻
IS UV light and UVC light same?
There are 3 types of UV radiation. UVA, UVB, UVC. UVC causes damage in DNA, thus destroy's the viruses ability to reproduce. However it does the same damage to human DNA, so people should not play with UVC, unless properly equipped.
Looking into that thing with the light still on not very bright the build quality letting UVC light out is pretty dumb too
maybe put a switch that would shut off light when door opens ( like a refrigerator door)
So you don't BBQ your eyes and hand
Sir I have same small low cost@300 disinfection box plz support
the girl is so pretty, :3 look smart and pretty C:
Here's a little more scientific testing:
www.nature.com/articles/s41598-018-21058-w
All that reading id rather die