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Science Forum Index » Optics Forum » About Narcissus in thermal imaging systems...
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 Posted: Wed Jun 04, 2008 3:03 am |
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Guest
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In most literatures, the Narcissus effect is described in the
following:
When the detector images itself for the reflection off an optical
surface in the lens train, a black(cold) spot will appear in the
image.
Why it is a cold spot, but not a warmer one?
I think the detector's self-image is added to the environmental
background, thus more energy is received and brighter spot appears.
Thanks in advance.
Wangj |
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| Helpful person |
| Posted: Wed Jun 04, 2008 3:15 am |
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Joined: 22 Jun 2004
Posts: 692
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On Jun 4, 9:03 am, mrwa... at (no spam) hotmail.com wrote:
Quote: In most literatures, the Narcissus effect is described in the
following:
When the detector images itself for the reflection off an optical
surface in the lens train, a black(cold) spot will appear in the
image.
Why it is a cold spot, but not a warmer one?
I think the detector's self-image is added to the environmental
background, thus more energy is received and brighter spot appears.
Thanks in advance.
Wangj
It is a cold spot because the reflection is from either the cold
shield or the (cold) detector itself. Different parts of the field
will see different proportions of ambient and cold reflected back. |
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