Tri-stimulus chrominance filters are precision optical filters engineered for color measurement and color matching systems. Based on the XYZ color space model, these filters replicate the spectral response of human vision, enabling accurate calculation of chromaticity and luminance values.
The X, Y, and Z filters correspond to different spectral sensitivity functions, supporting precise measurement of red, green, and blue components in colorimeters and spectrophotometers. With advanced dielectric coatings, SOT’s tristimulus filters deliver high transmission, strong out-of-band blocking, and long-term environmental stability. Custom designs are available for applications requiring stricter mismatch limits or application-specific spectral profiles.
Key Features
- Purpose-Built for Color Measurement – Optimized for accurate chroma and luminance analysis
- XYZ Color Space Compliance – X, Y, Z filters aligned to tristimulus color measurement standards
- Low Mismatch Error – ≤ 3% mismatch for reliable and repeatable color data
- High Transmission Efficiency – Peak transmittance ≥ 90% in defined spectral regions
- Customizable Accuracy – Enhanced precision and tighter tolerances available on request
Spectrum Transmission
Each X, Y, and Z filter exhibits a carefully shaped transmission curve with ≥ 90% peak transmittance in its target wavelength range. Custom transmission profiles can be developed to meet specific color standards or instrument requirements.
Coating Quality & Environmental Reliability
All tristimulus filters undergo rigorous qualification:
- Adhesion (MIL-C-675C) – No blistering or peeling after repeated tape removal
- Thermal Cycling – −62 °C to +71 °C with no coating detachment
- Abrasion Resistance (MIL-C-675C / CCC-C-440) – No surface damage after 25 cycles at 1.0 lb load
- Humidity Resistance – 95–100% RH at 49 °C for 24 h without defects
- Solvent Resistance – Stable after acetone and alcohol exposure
- Salt Spray – 100 h at 35 °C, 5% salt concentration with no degradation
Standard Specifications
| Model | CWL (nm) | Peak Transmittance | FWHM (nm) | Optical Density | Notes |
|---|---|---|---|---|---|
| NH-X-Filter | 405 ± 3 | ≥ 90% | 20 ± 5 | OD ≥ 3 @ 350–1100 | Customizable for higher accuracy |
| NH-Y-Filter | 520 ± 3 | ≥ 90% | 20 ± 5 | OD ≥ 3 @ 350–1100 | Customizable for higher accuracy |
| NH-Z-Filter | 620 ± 3 | ≥ 90% | 20 ± 5 | OD ≥ 3 @ 350–1100 | Customizable for higher accuracy |
Typical Applications
- Printing Industry – Accurate color reproduction and quality control
- Textiles & Fabrics – Precise color matching across batches
- Food Industry – Color grading and consistency verification
- Decorative Materials – Reliable color comparison for construction and interiors
- Automotive Manufacturing – Inspection and validation against color standards
Need tighter mismatch or a custom XYZ response?
Contact us with your target color standard, mismatch tolerance, substrate, and instrument details for a tailored solution.