FLIR Presents Dual Spectrum High Security Focused PTZ

By Sean Patton, Published May 01, 2020, 11:23am EDT (Info+)

FLIR presented its Elara DX-Series bispectral, visible and thermal, PTZ targeted at high-security operations at the April 2020 IPVM New Products show.

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Comments (10)

While the visible imager has a long-range telescopic lens, the thermal imager is fixed.

ok, it's fixed, but it doesn't look like it has a lens at all, unless it's one of those nano-engineered, wave-guided, fresnel bastards.

how did FLIR manage to "flatten the curve"?

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Just like the lens for the color camera is behind a glass window which you can see through, the lens for the thermal camera is behind a germanium window that you can't see through.

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...the lens for the thermal camera is behind a germanium window that you can't see through.

is the thermal lens made of germanium also?

could i see thru the window by using another thermal camera?

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Yes, you could see through the germanium lens with another thermal camera, which would allow you to see the the thermal sensor behind the lens. Though just like you can't see much through the clear lens of an optical sensor due to the way the glass is formed into a lens, you wouldn't see much detail of the thermal sensor.

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thanks.

just to be clear, what you are saying is that there is a

flat, rectangular piece of germanium,

covering a round, curved germanium lens,

in front of a rectangular sensor?

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That is correct.

Just like for the color camera there is a

flat, circular piece of glass,

covering a round, curved glass lens,

in front of a rectangular sensor.

Thermal cameras work on different wavelengths where glass is opaque. However germanium is transparent in the wavelengths thermal cameras use but opaque to the wavelengths color cameras (and our eyes) see. The fundamental physics for the lenses are the same, they just use different materials for color lenses vs thermal lenses.

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Just like for the color camera...

almost "just like", since the flat piece of the germanium glass is rectangular, not round like the optical glass.

to cover a circle with a square, the square has to have 25% more area than the circle, and rectangles are obviously even more wasteful.

and mono-crystalline germanium glass is not cheap.

so why do they do it?

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also perplexing: since germanium crystals are grown much like silicon crystals, you would typically cut roundish wafers from them:

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so cutting a rectangle out of a circle, and using that rectangle to cover another circle would seem to use 2x as much raw germanium (without re-grow) as just cutting a round wafer to cover a round lens.

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What is the range of the dx-612 ?

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the range of the DX-612 can be found on the DX-Series AE Specification page (on page 8)

here is a screen shot:

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