I have been using white star LEDs in a sensing application, and realized it would be helpful if we could also look at signals around 350nm and 900nm. We expect some interesting phenomena to be observable in those ranges, and would love to monitor all of these regions simultaneously.
Unfortunately, we don't have the equipment to merge 3 beams, so I was wondering if there's a way to get an LED that has all of these? It would I suppose be three LED's on the same backplate, so they are all focused on the same beam path. Does something like this exist?
Alternatively, does anyone know of a cheap and stable blackbody source that would also radiate in these wavelengths? I've seen only expensive sources
Hi,
High intensity discharge lamps, also known as xenon lamps for vehicles can fit to your measurements. You can buy a set for 100-150 bucks. The plasm in them is relatively small in size therefore they are not so difficult to collimate or to focus. You can buy such bulbs in various radiation temperature.
It's possible that you have to remove the protecting glass shield in order not to block the UV or IR region.
David
Thanks I'll check it out. Could they run on a traditional power source?
No they need their own ignitor. But those are also included in the price that I mentioned above. A set that you can buy will look like:
http://www.taotaoocean.com/photo/pl907144-12v_35w_h4_6000k_diamond_white_xenon_hid_conversion_kit_high_low_beam_1_set12v_35w_h4_600.jpg
They operate on 12-14 VDC and ~ 3-4A but at the startup, for a subsecond period they need current up to 10-15 Amps. The easiest is to run them on a battery, or an old, unused PC power supply.
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