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INFRARED NEUTRAL DENSITY FILTERS | IR ND FILTER KITS
Metallic-coated infrared neutral density filters (IR ND filters) obtain their optical density from a metal alloy coating on a substrate determined by the wavelength region of interest. Unlike the all-dielectric or absorption type, the metallic type ND filter employs a combination of absorption and reflection to reduce the intensity of light.
Andover's infrared neutral density filters exhibit outstanding spectral neutrality, outperforming all others on the market.
We also have a new variant available for select densities which includes a broadband anti-reflective coating on one side. This is useful in imaging systems where multiple reflections from the coated surfaces could be a concern. Look for BBAR in the part number.
Note: Custom sizes and spectral characteristics are available on request. Contact our technical sales department for a quotation.
Neutral density Filter Benefits
- Provides attenuation with greater linearity over a wide spectral range
- Delivers superior durability
- Custom substrates available
Neutral density Filter Common Applications
- Thermal Imaging
- Medical Imaging
- IR Test Bench
- IR Photography
General Specifications:
| Dimensional Tolerances: | ±0.2mm |
| Thickness: | 1.0mm |
| Min. Clear Aperture: | 90% of outside dimension |
| Surface Quality: | 80/50 per MIL-O-13830B |
| Coating Quality: | 80/50 per MIL-O-13830B |
| Coating Adherence: | Per MIL-M-13508C |
| Humidity: | Per MIL-STD-810F |
| Substrate Material: | Germanium |
| Flatness: | 3–5 waves per 25mm |
| Parallelism: | 10 arc minutes or better |
| Mechanical: | Unmounted |
