Technology From: Avian Technologies

High Reflectance Diffuse Coatings

Avian-B

This is a well characterised coating that has been used for diffuse reflectance applications for more than 20 years. It is relatively easy and inexpensive to apply.

Avian-D

Avian-D coating is a two-part water based urethane coating uses a different pigment system than Avian-B and can be applied to a wide variety of substrates.

Avian-D coating is ideal for field applications where the coating will experience variations in temperature and humidity, such as calibration plates and remote sensing targets. It is ideal for large integrating spheres used in lamp measurement photometry where large amounts of UV

are not present.

Key Features

• Water proof
• Durable
• A two part coating with a water phase with pigment and an activator
• A pot life of approximately 48-72 hours after mixing
• A shelf life of the unmixed coating of 1-2 years
• The reflectance of Avian-D coating matches that of barium sulphate based coating in the visible region of the spectrum
• Useable down into the near-UV
  Ultraviolet
  and in the very near-IR
  Infrared
• Stable over the range -40°C to about 85°C

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Technology From: Avian Technologies

IR Gold Coatings & Materials

Warsash Scientific offers two gold materials that combine the high reflectance of Epner LaserGold^® and the surface preparation technology of Avian Technologies to give optimum diffuse reflectance in the near-NIR and mid-NIR. The NIR

coating utilises practically any metallic substrate and is most effective in the 1.0-6.0 micron range. The mid-IR material is a new technology in IR diffuse reflectance that combines Epner's plating expertise and sintered metal technology. This coating is best suited to applications in the 2 micron to 25 micron (or greater) wavelength range.

Reflectance of the NIR

Coating is >94% throughout its specified range. The mid-IR Coating exhibits total hemispherical reflectance of >90% from 2 microns to >25 microns.

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Technology From: Avian Technologies

Diffuse Black Coatings & Materials

Avian Black-S

This is a spray on, two part water based urethane coating that exhibits low reflectance over a wide wavelength range. The water-borne coating exhibits very low gloss and is quite durable compared to most low reflectance coatings. It is easily mixed and may be applied with standard spraying equipment. Clean up is easily done with water and detergent.

The coating passes and exceeds Mil spec for live agents and durability. It is a low VOC

coating (<0.18kg/L) and is non-flammable as applied.

The reflectance is <3.5% over most of the UV-Vis-NIR

and approximately 3% over most of the range.

Avian-DS Black

Avian-DS black is an etch-anodize process similar to what was known as Martin Black. Avian-DS, however, is even more absorbent of light. It is the blackest material that Avian Technologies have seen in almost twenty years in this field. Coating is limited to parts fabricated from aluminium. This is a batch process, so small lots tend to be very expensive but the coating is economical for large lots or OEM quantities. This coating can only be applied to aluminium substrates.

Avian-EP Black

Avian-EP Black is an electrochemical process that can be applied to almost any substrate including plastic or glass. The coating is highly diffuse but somewhat fragile, so its use in applications that require handling of the optical surface are not recommended.

Optically, Avian-EP Black is very highly absorbent in the UV-Vis-NIR

and has better range than Avian-DS Black (above). The coating remains 'black' out to 7-8 microns.

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