Instructables
Picture of Halloween Fog Screen Photo Frame
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I have been fascinated by the hologram scenes in Star Wars since I was a little boy. This Halloween, I decided to create the similar effect using a home made fog screen.

Fog screen is an "immaterial" projection screen that consists of air and a little humidity, and enables high-quality projected images in thin air. The image floating in thin air encourages kids to play with it. 

However, most fog screen designs are either expensive or complicate to operate. We often need to control the temperature and the air flow at the same time. Some widely used ingredients such as dry ice and hot oil are also dangerous to kids. So I build a simple desktop fog screen for my daughter using a low cost ultrasonic humidifier. My humidifier costs $39.99. And it is the most expensive part. This process is also very straight forward. It took me about 2 hours. The operation of humidifier naturally creates the fog screen as a by-product. We do not need to think about adding dry ice or any fog solution. And my daughter loved it.

Another happy Halloween just past. Here is how I made it.

 
 
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Step 2: Test and clean humidifier

Make sure the ultrasonic humidifier works. A typical ultrasonic humidifier uses a metal diaphragm vibrating at an ultrasonic frequency to create water droplets that silently exit the humidifier in the form of a cool fog. This forms an extremely fine mist of droplets about one micron in diameter, that is quickly evaporated into the air flow. If your humidifier has a plastic cover that is used to guide the air flow and decorate the humidifier, please remove it. We need to make our own air channel to guide the fine mist and create a thin screen in the air.  

If necessary, you can clean your old humidifier with white vinegar.
avni9995 months ago
This is genius!
oldmicah10 months ago
That is awesome. Love the idea do using the humidifier!
andrea biffi10 months ago
Oh my, this is impressive!!
Dominic Bender10 months ago
Interresting concept, thanks for sharing! I cannot help but wonder whether this would be possibly to do with a whole doorframe...
Wei_TO (author)  Dominic Bender10 months ago
Yes. We can build a very big fog screen using an industrial ultrasonic humidifier (see the link attached).

http://youtu.be/SCjSgF3SG-Q

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audreyobscura10 months ago
Wow! This is so cool!! What a sweet mechanism you built to project on.
Wei_TO (author)  audreyobscura10 months ago
Thanks. :-)