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Old 04-06-2011, 02:56 PM #1
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Default 1500nm how to detect?

I'm playing with a range finder with a 1500nm laser diode. ANy material that will "glow" with this wavelengh? I'm trying to align the optics but this wavelengh is way IR and invisible. Detector cards, goggles, special paper that will help?

thx...


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Old 04-06-2011, 03:06 PM #2
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Default Re: 1500nm how to detect?

A thermometer will detect it, I guess....
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Old 04-06-2011, 05:01 PM #3
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Default Re: 1500nm how to detect?

Uhm, it depend from the thermometer ..... professional labby ones have a reading range that go between 750/800nm to 20.000nm, but they requires special sensors and special materials for the sensor window ..... usual "commercial" IR (AKA non-contact) thermometers have "cheap" sensors that only work in a range from 7.500/8.000 nm to 18.000/20.000 nm, depending from the material used for the window.

Anyway, also pro ones are not image devices (except for FLIR cams), they are only thermal sensors ..... i mean, they can detect it, but not give you an image (if the purpose is focusing)
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Old 04-06-2011, 06:36 PM #4
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Default Re: 1500nm how to detect?

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Originally Posted by blrock View Post
Detector cards, goggles, special paper
If a power is high enough, try these Temperature Sensitive Liquid Crystal Sheets
from Temperature Sensitive Liquid Crystal Sheets - Edmund Optics
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Old 04-06-2011, 06:47 PM #5
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Default Re: 1500nm how to detect?

And if temperature is low enough, use thermal paper, like the kind from fax machines,
cash registers and so on. It turns black from heat.
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Old 04-06-2011, 06:49 PM #6
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Default Re: 1500nm how to detect?

^ edit: the problem there is that it is initially white, and will reflect the light. Even the black parts of the paper still reflect my 808nm pen.

A glow-in-the-dark sheet lit by a blacklight will serve as a simple real-time detector. How it works: the IR light causes the stored energy in the sheet (given to it by the black light) to be emitted.

FLIR doesn't go that high.

edit: I found an example. Skip to 55 seconds

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Old 04-07-2011, 02:04 AM #7
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Default Re: 1500nm how to detect?

I have some Indium salt based photodiode IR detector modules, PM me in about a week when I'm off the road, and I can sell you a 1-5 micron detector cheap. Odds are 1.6 u will not show up on quenched ZnS. Usually a different upconversion phosphor is used.

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Old 08-27-2012, 09:20 AM #8
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Default Re: 1500nm how to detect?

This post is wayyyy past the date the thread was started, but I thought it a good place to ask. I am also interested in range finding at 1500nm. Does anyone know where I can find a 1500nm pulse diode that can put out high power for a few microseconds? Looking for something used, or surplus, unless there are reasonably priced units available new.
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Old 09-06-2012, 05:56 AM #9
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Default Re: 1500nm how to detect?

Anyone willing to help me locate one for $? I'm looking for a high power pulse diode operating at or near 1500nm which can output many J of pulse power at 1 ns or more pulse duration. Finder reward of 50 dollars once I have the item in hand. Looking for high power, multiple kw peak power.
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Old 09-06-2012, 12:41 PM #10
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Default Re: 1500nm how to detect?

Quote:
Originally Posted by Wadsworth View Post
Anyone willing to help me locate one for $? I'm looking for a high power pulse diode operating at or near 1500nm which can output many J of pulse power at 1 ns or more pulse duration. Finder reward of 50 dollars once I have the item in hand. Looking for high power, multiple kw peak power.
What exactly are you building in Afghanistan with a High Powered
IR Laser for Range Finding...


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Old 09-06-2012, 01:03 PM #11
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Default Re: 1500nm how to detect?

Gathering parts for another location, not for use here. I don't want to disclose the use, it's not a government project, not meant to be aimed at people, airplanes or anything unsafe like that.

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