Author Topic: Siemens LD271  (Read 9749 times)

Offline cruonit

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on: February 16, 2009, 07:10:42 PM
Is the siemens LD271 a good alternative for TSAL6400 (i can't get it in my Country - only the 6200)

Angle :


LD271


vs  (TSAL6400 )


TSAL6400


both are ~950nm

LD271 datasheet: http://www2.produktinfo.conrad.com/datenblaetter/175000-199999/184365-da-01-en-LD271_LD271L_IR-S-DIODE.pdf

« Last Edit: February 16, 2009, 07:12:21 PM by cruonit »



Offline benpaddlejones

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Reply #1 on: February 16, 2009, 07:25:19 PM
cruonit
I tested these (Osram LD271, same beast) they perform OK but if you look at the 'relative sprecrum emission' over 50% of emissions are over 950nm. It will work but you will get beter results with a TSAL6400 or TSAL5300.

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Offline Wiweeyum

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Reply #2 on: February 16, 2009, 07:48:07 PM
What equipment would be needed to do these tests yourself?


~"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction."~
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Offline benpaddlejones

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Reply #3 on: February 16, 2009, 10:16:15 PM
Wiweeyum
I simply made an IR-Pen with a LED multifit that allowed me to change the LED with ease. I then bought about 100 leds from all over the world, cost me about $250+ with postage etc.

The two tests I did:
1. IR-Quality:
  • Use presenter application, the cross hair changes colour and crosshar cound with quality of IR-source
  • Walk away until the cross hair turns blue, further teh distance the better

2. Accuracy:
  • On a white board, with a normal whiteboard marker, I wrote the word "Hello" in cursive writing
  • Write over the word and assess how close the digital image is to the live image

I rulled out most IR-leds with the second test as very view were even red close up or turned blue after 2-3m. The only IR-Leds that stood all tests were OSRAM & Vishay. The Vishal TSAL6400 spanked all others on the 'Hello' test and the IR-quality test.

This was done after my extensive research into the qualities of IR-Leds in my 101 for IR-Pens, so I knew the outcome for many, just wanted to check. I didn't do the TSAL5300 because it was so close to TSAL6400 and was running out of money. Although as Francisico found, I should have.

benpaddlejones :)



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Offline Wiweeyum

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Reply #4 on: February 17, 2009, 12:17:39 AM
Wow, well it's definitely helped the community out quite a lot. So thank you for the research.

I'd like to do something similar with diffusing the LEDs in different ways. I'd be curious to see that way the band on the datasheet diagram would change if the LED were sanded to be more diffused.


~"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction."~
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Offline benpaddlejones

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Reply #5 on: February 17, 2009, 05:19:46 AM
Wiweeyum
Diffussing the IR-led will only affect the relative redient intensity. This is essentially the sahpe of the light. Creating a rounder shape. The relative spectrum emmision will remian unchanged. All diffusion will do is improve the tracking qualities as the IR will be clearer to the Wiimote.

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Offline cruonit

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Reply #6 on: February 17, 2009, 11:27:01 AM
tnx benpaddlejones !!