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IR transparent pigment

Tompa

Feb 26, 2023
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I’m reaching out for help concerning NIR-transparent pigment.

The area of usage is a optical sensor in the range of >650nm
No visual light allowed.

I have in earlier projects used ir acrylic sheets such as Acrylite Black 9M020.

But I now want to create custom models in special sizes and forms.

So I’m going to try to cast acrylic shapes and then polish to my optical standards.


But! I’m looking for a pigment/color/substant to add to the cast in order to color it to the ir standards as the Acrylite Black 9M020 or similar.

Is this possible? And what pigment/color/substant am I looking for?

Thankful for every answer.
 

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kellys_eye

Jun 25, 2010
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What is the actual IR device you're using? Most (that I've got or come across) are already embedded in IR-transparent resin.
 

Delta Prime

Jul 29, 2020
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Sounds like fun.
To meet your specific optical density and light transmission requirements from your initial developmental stage., I would invest in an spectrophotometer. which is a device that measures light transmittance through a material and from that absorbance can be inferred & It also reduces quality risk from improper dye blend formulation, dye loading, inadequate dye dispersion, or excessive thermal stress when when heating polymers or monomers.
What you want to look out for is what's known as near infrared cut-on filters or long wavelength band-pass filters. They are designed to block UV and visible light while transmitting NIR light. Dye powders and thermoplastic compounds with Visible Opaque properties.
Visibly opaque die for thermoplastic
Compound, solvent-based systems,
Ready to to mold compounds.
Optimizing IR light absorbance and visible light transmittance in a myriad of thermoplastic and thermoset polymeric materials such as polycarbonate, acrylic, polyamide, cellulose propionate, polystyrene, PVC, COC and polyurethane.
All of these compounds employ what is known in the industry as Lambda max (λmax): The wavelength at which a substance has its strongest photon absorption.
References:
H.Y. Kim and T.H. Kim. Materials for thermal imager and application trend. Ceramist. 17, 61–71(2014)
M. Vollmer and K. Möllmann. Infrared Thermal Imaging: Fundamentals, Research and Applications.Wiley-VCH, Weinheim (2018).
Eggleton, B. J. et al. Chalcogenide photonics. Nat Photon. 5, 141–148 (2011
 

Tompa

Feb 26, 2023
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Feb 26, 2023
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What is the actual IR device you're using? Most (that I've got or come across) are already embedded in IR-transparent resin.
A low light camera.
So the material are to cut all visual light in order just let the nir-light in. To create a camera without any aparture in its appearance.
 

kellys_eye

Jun 25, 2010
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Have a look at the various light filters used in astro photography. They are quite large (usually made to fit 1.25" lenses) and available in many 'cuts', all of which are optically flat too.
 
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