Science > Physics > two rays of different wavelength will generate the same electric current ?
| Topic: |
Science > Physics |
| User: |
"laura" |
| Date: |
22 Sep 2006 05:06:56 AM |
| Object: |
two rays of different wavelength will generate the same electric current ? |
Hi,
I have 2 different light rays which have different wavelengths (for
instance one is red and the other is green).
I'm sending these rays to 2 photodiodes.
Is the electric current generated by those photodiodes the same? Are
there any differences (power, intensity) ?
thanks,
laura
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| User: "Sampan Touk" |
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| Title: Re: two rays of different wavelength will generate the same electric current ? |
22 Sep 2006 08:34:01 AM |
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"laura" <laura.brandusan@gmail.com> wrote in message
news:1158919616.414204.250090@k70g2000cwa.googlegroups.com...
Hi,
I have 2 different light rays which have different wavelengths (for
instance one is red and the other is green).
I'm sending these rays to 2 photodiodes.
Is the electric current generated by those photodiodes the same? Are
there any differences (power, intensity) ?
no, the two wavelengths will have slightly different response, and two
different die (photodiodes) will also have slightly different responses, you
will have to calibrate.
Also your sources for red, and green will have different output powers.
google for it
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| User: "Sorcerer" |
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| Title: Re: two rays of different wavelength will generate the same electric current ? |
22 Sep 2006 06:02:43 AM |
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"laura" <laura.brandusan@gmail.com> wrote in message
news:1158919616.414204.250090@k70g2000cwa.googlegroups.com...
| Hi,
|
| I have 2 different light rays which have different wavelengths (for
| instance one is red and the other is green).
|
| I'm sending these rays to 2 photodiodes.
|
| Is the electric current generated by those photodiodes the same? Are
| there any differences (power, intensity) ?
|
|
| thanks,
| laura
http://www.lon-capa.org/~mmp/kap28/PhotoEffect/photo.htm
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| User: "will1" |
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| Title: Re: two rays of different wavelength will generate the same electric current ? |
22 Sep 2006 01:02:10 PM |
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Try this. Find a glass prism and create a spectrum (sunlight works great).
Find a photographer's light meter and measure the different colors projected
by the prism. Will E.
"laura" <laura.brandusan@gmail.com> wrote in message
news:1158919616.414204.250090@k70g2000cwa.googlegroups.com...
Hi,
I have 2 different light rays which have different wavelengths (for
instance one is red and the other is green).
I'm sending these rays to 2 photodiodes.
Is the electric current generated by those photodiodes the same? Are
there any differences (power, intensity) ?
thanks,
laura
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| User: "Sam Wormley" |
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| Title: Re: two rays of different wavelength will generate the same electriccurrent ? |
22 Sep 2006 11:49:33 AM |
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laura wrote:
I have 2 different light rays which have different wavelengths (for
instance one is red and the other is green).
I'm sending these rays to 2 photodiodes.
Is the electric current generated by those photodiodes the same? Are
there any differences (power, intensity) ?
Depends on that wavelengths and sensitivities to those wavelengths
the photo diodes have.
A measurement us worth a thousand expert opinions.
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| User: "Sue..." |
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| Title: Re: two rays of different wavelength will generate the same electric current ? |
22 Sep 2006 05:53:13 AM |
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laura wrote:
Hi,
I have 2 different light rays which have different wavelengths (for
instance one is red and the other is green).
I'm sending these rays to 2 photodiodes.
Is the electric current generated by those photodiodes the same? Are
there any differences (power, intensity) ?
thanks,
laura
Red or even IR will likely give the lowest overall
attenuation if the primary cosideration is the conversion
efficiency of the semiconductors. Ya ever see a
TV remote with green a green LED ? ;-)
Sue...
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