1. Features
- High-performance filters specifically designed for color measurement applications.
- Widely used across industries such as printing, textiles, and food for accurate chroma data analysis.
- Excellent for applications requiring precise color matching with low mismatch degrees (≤3%).
- Customizable for higher accuracy or specific operational requirements.
- Available in three models (X, Y, Z filters) to measure various color metrics based on different wavelengths.
2. General Description
The tri-stimulus chrominance filters from Shape Optics Technologies Pte Ltd (SOT) are specifically engineered to meet the precise needs of color measurement systems. These filters are essential in industries such as printing, clothing, and food production where accurate color matching is crucial. Based on the XYZ color space model, the X, Y, and Z filters are optimized for different color channels—red, green, and blue, respectively. These filters are designed to precisely match the spectral sensitivity functions for chromatic data analysis.
Each model is designed to ensure minimal mismatch (≤3%) with specific wavelength ranges, providing reliability and consistency across a wide range of industrial and commercial applications. The filters are produced using advanced optical coatings to ensure high transmissivity and excellent durability. Custom options are available to meet unique project needs, including stricter mismatch limits for high-accuracy environments.
3. Spectrum Transmission Curves
- Spectrum transmission curves are available for the X, Y, and Z filters, with high transmission rates of ≥90% across the specified wavelength ranges.
- SOT offers customization options if specific transmission characteristics are required.
4. Coating Quality
- Adhesion Test: Compliant with MIL-C-675C military standards, an adhesion test is conducted by applying a tape that meets LT-90 specifications to the lens film layer. The tape was fully affixed and removed vertically. After three repetitions, no blistering or peeling was observed.
- Temperature Test: Following MIL-C-675C standards, the filters are subjected to temperatures of -62±1°C and 71±1°C. The adhesion test is repeated after the temperature cycling at room temperature (16°C~32°C), confirming no film detachment.
- Abrasion Resistance: Conforming to MIL-C-675C and CCC-C-440 standards, the abrasion resistance is tested using a gauze tester applying a minimum force of 1.0 lbs (0.45 kg) for 25 cycles. This ensures no damage occurs.
- Humidity Test: Conducted under MIL-C-675C criteria, the filters undergo a humidity test in a controlled chamber at 49±2°C and 95%-100% humidity for 24 hours with no damage observed.
- Solvent and Cleaning Test: The filters are exposed to acetone and alcohol for at least 10 minutes each and then air dried and wiped clean. The surface remains undamaged.
- Salt Spray Test: After 100 hours in a 35°C salt spray environment with a 5% concentration, the filters show no signs of damage.
5. Standard Specifications
| Model | CWL(nm) | Peak Transmittance | FWHM(nm) | Optical Density | Note |
| NH-X-Filter | 405±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Customizable for higher requirements |
| NH-Y-Filter | 520±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Customizable for higher requirements |
| NH-Z-Filter | 620±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Customizable for higher requirements |
6. General Applications and Examples
The tri-stimulus chrominance filters are widely used in colorimeters for industries requiring accurate color measurement. Applications include:
- Printing: Ensuring precise color reproduction in various types of print media.
- Textiles: Used for color matching in fabric production.
- Food Industry: For color grading and ensuring consistency in food production.
- Decoration: Used for consistent color matching in construction and home décor materials.
- Automotive: For inspecting automotive parts to meet color standards.
- Filters are available to match the color space used in specific applications and customized for clients with stricter requirements for accuracy.
7. SOT Strengths and Capabilities
SOT excels in manufacturing high-precision optical filters, with capabilities in providing custom specifications to meet the diverse needs of various industries. Our focus on quality, durability, and customization ensures that we provide filters that meet stringent quality controls. With a deep understanding of optical engineering and coatings, SOT can deliver tailored solutions for color measurement, ensuring excellent reliability and long-term performance in any application.
8. Standard Products
SOT offers the following tri-stimulus chrominance filters for use in various applications:
- NH-X-Filter: Optimized for the X-axis, focusing on the red channel.
- NH-Y-Filter: Optimized for the Y-axis, focusing on the green channel.
- NH-Z-Filter: Optimized for the Z-axis, focusing on the blue channel.
- Each filter is available in standard models with customization options available for stricter performance requirements.
