Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




134 posts

Master Geek


# 175863 14-Jul-2015 11:15
Send private message

I am trying to find a way to create a curtain/wall of light without having to have the light sit inside a rigid surface.

Essentially I want a circle 8-10" in diameter and around its circumference I want a solid beam of light that will travel at most 18-24"

Think kind of like a force field of visible light without of obvious force field bit.


I have been hunting around on the internet and started looking at L.E.Ds and Lasers and thought I might try on here in case someone has had experience with light shaping etc.

 

 

 

Ive attached a cheezy UFO image to give you the idea im talking about with the light (best representation I could find)


Create new topic
15001 posts

Uber Geek

Trusted
Subscriber

  # 1342918 14-Jul-2015 11:32
Send private message

Can you give more context about why and what you're trying to achieve? Also why the limitation of no fixed cover / guide?

2120 posts

Uber Geek


  # 1342919 14-Jul-2015 11:35
2 people support this post
Send private message

Basically what you need to do is recess the light source behind a cylinder lined with a reflective surface. 

The light source would be placed inside a dish that it reflects most light straight down in one direction, then the cylinder will help focus the light...

A bit will spill as it bounces down the tube...you could make the tube inner black velvet to prevent it reflecting but you would lose too much light.

You also need to add some smoke to the environment , so that the beam will be pronounced and reflected off the smoke particles 

If you want to ensure the light is even more straight you can insert a honeycomb grid at the exit point so any light heading sideways gets knocked out (pictured below)

Beam

 
 
 
 


3992 posts

Uber Geek


  # 1342926 14-Jul-2015 11:43
One person supports this post
Send private message

basically you want a theatre follow spot....



134 posts

Master Geek


  # 1342948 14-Jul-2015 12:13
Send private message

Actually Yes, A miniaturized theatre followspot that is 8-10" in diameter and only a max of 2-3" deep which has to project the light 18-14"

Edit: and L.E.D since it will be around plastics and I dont want a halogen to melt the plastic

62 posts

Master Geek


  # 1342987 14-Jul-2015 13:27
Send private message

wellygary: basically you want a theatre follow spot....



This will work however seeing the throw distance is only 24" or +-600mm a followspot may be overkill.

More info is required eg how bright does it need to be, what colour temp, fixture size restrictions etc.

Am happy to help out.

62 posts

Master Geek


  # 1342994 14-Jul-2015 13:36
Send private message

NZVengeance: Actually Yes, A miniaturized theatre followspot that is 8-10" in diameter and only a max of 2-3" deep which has to project the light 18-14"

Edit: and L.E.D since it will be around plastics and I don't want a halogen to melt the plastic




That is very shallow. The only way to get a hard edge beam is to put the source behind two lenses and focus them to a point like a followspot. Some depth is required to fit all of this in.

We can scale all of it down to something like a profile fixture eg Selecon pacific with a narrow zoom lense. These run on 1000w lamps.

Even smaller would be a ETC Source 4 mini LED




134 posts

Master Geek


  # 1342995 14-Jul-2015 13:36
Send private message

So the light needs to wholly bit inside a cylinder that is 74mm high and 2500 in diameter

Colour either Blue (9,000-10,000 Kelvin) or Red (1,000-1,1500 Kelvin) Being able to switch between the two would be cool.

Brightness I am undecided (perhaps 250+ lumens so that the brightness is maintained across the beam distance)

Edit: saw your reply I could make it taller. Like 5" but that would be at the outside.

 

Also the light cant produce any real heat as it will be around plastic models.

 
 
 
 




134 posts

Master Geek


  # 1343021 14-Jul-2015 13:54
Send private message

The problem with the ETC Source 4 mini LED is that it is 9" deep at only 2.5" in diameter

62 posts

Master Geek


  # 1343028 14-Jul-2015 14:06
Send private message

NZVengeance: So the light needs to wholly bit inside a cylinder that is 74mm high and 2500 in diameter

Colour either Blue (9,000-10,000 Kelvin) or Red (1,000-1,1500 Kelvin) Being able to switch between the two would be cool.

Brightness I am undecided (perhaps 250+ lumens so that the brightness is maintained across the beam distance)

Edit: saw your reply I could make it taller. Like 5" but that would be at the outside. Also the light cant produce any real heat as it will be around plastic models.


How about a LED MR16 lamp in warm white with a narrow beam angle. Try to get single a source lamp as multi source will cast multi shadows. Fashion a snoot from some black wrap and put colour gell on the front.
You could step it up to an RGB MR16 but that would require allot more drive gear/controllers.

Additionally to this you'll need some haze in order to see the beam in the air.


Edit:
Am I thinking in the right direction here or are you looking for a parallel beam rather than a cone shape?



134 posts

Master Geek


  # 1343031 14-Jul-2015 14:13
Send private message

That could work, Ive also just been reading this and wondering how hard it would be to focus the light using a couple of lenses like the ones from here.

2918 posts

Uber Geek

Lifetime subscriber

  # 1343050 14-Jul-2015 14:38
Send private message

I think the shape of the reflector around the light source is most important. A good reflector would mean you wouldn't need a tube. From my 5th Form Physics, if the reflector is parabolic, with the (infinitely small) light source at the focus, then all light rays come out parallel. Presumably some other shape near to a parabola would give a conic beam of light as per your image rather than just parallel. Probably any torch reflector would more or less approximate this.

To get around the height limitation, could you put the reflector + LED + tube thing in macuser's diagram horizontally, and then use a 45 degree flat mirror to shine the beam downwards? With a bit of knowledge and maths, you could probably design a non-flat mirror to shape the beam, but that's beyond me. 

Do you really want a round spotlight? How about some crosshairs? That would be much easier with two line-beam lasers (http://www.aliexpress.com/item/650nm-5mW-Red-Laser-Line-Module-Focus-Adjustable-Laser-Head-5V-good/1989170400.html) mounted vertically at right angles to each other. Or if you had one line-beam laser and spun it fast, it would appear to the eye to be a circle.

Can you make the cone out of perspex or similar? Or does it need to be in the open air? As others have said, if it's open air then you need a fog machine or similar to make the beam visible. Shining LEDs into the edge of a perspex sheet makes the perspex glow.




134 posts

Master Geek


  # 1343064 14-Jul-2015 14:42
Send private message

It needs to be open air which makes it harder and I don't know how practical it will be to try and get smoke in around it.

That line laser is cool and will work for another task but not this one



134 posts

Master Geek


  # 1343075 14-Jul-2015 14:55
Send private message

Perhaps not the perfect example but here is something from a movie where two people are being lifted up in a beam of light like some kind of tractorbeam / gravity elevator.

This is the effect I'm trying to create.


  

Create new topic



Twitter and LinkedIn »



Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Intel expands 10th Gen Intel Core Mobile processor family
Posted 23-Aug-2019 10:22


Digital innovation drives new investment provider
Posted 23-Aug-2019 08:29


Catalyst Cloud becomes a Kubernetes Certified Service Provider (KCSP)
Posted 23-Aug-2019 08:21


New AI legaltech product launched in New Zealand
Posted 21-Aug-2019 17:01


Yubico launches first Lightning-compatible security key, the YubiKey 5Ci
Posted 21-Aug-2019 16:46


Disney+ streaming service confirmed launch in New Zealand
Posted 20-Aug-2019 09:29


Industry plan could create a billion dollar interactive games sector
Posted 19-Aug-2019 20:41


Personal cyber insurance a New Zealand first
Posted 19-Aug-2019 20:26


University of Waikato launches space for esports
Posted 19-Aug-2019 20:20


D-Link ANZ expands mydlink ecosystem with new mydlink Mini Wi-Fi Smart Plug
Posted 19-Aug-2019 20:14


Kiwi workers still falling victim to old cyber tricks
Posted 12-Aug-2019 20:47


Lightning Lab GovTech launches 2019 programme
Posted 12-Aug-2019 20:41


Epson launches portable laser projector
Posted 12-Aug-2019 20:27


Huawei launches new distributed HarmonyOS
Posted 12-Aug-2019 20:20


Lenovo introduces single-socket servers for edge and data-intensive workloads
Posted 9-Aug-2019 21:26



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.