Circular Variable Neutral Density Filters
Adjustable Attenuation:
- The circular variable ND filter allows for fine-tuned control of light attenuation by simply rotating the filter.
- The optical density (OD) increases linearly with the rotation angle, providing smooth and predictable adjustments.
Linear Density Relationship:
- The linear relationship between optical density and rotation angle allows for precise control, which is particularly useful for applications requiring accurate light modulation.
- Enables motorized rotation for precise logarithmic sweeps in transmitted beam power.
Specifications:
- Outer Diameter: Available in sizes ranging from 10mm to 200mm.
- Coating Region: Covers 0-270°.
- Optical Density Range Options: Max. OD1, Max. OD2, Max. OD3, and Max. OD4.
Ease of Use:
- Users can easily set the filter to achieve the desired transmitted beam power by referencing the angular markings.
- This convenience facilitates quick and accurate adjustments during experiments or industrial processes.
Applications: Industrial Imaging, Machine Vision, Spectroscopy, Laser Experiments, etc.
Circular Variable Neutral Density Filters (ND Filters) are specialized optical filters that allow for adjustable light attenuation. Unlike homogeneous ND filters that offer even attenuation across the surface, circular variable ND filters enable users to modify the light attenuation by rotating the filter about its center. The optical densities of these filters have a linear relationship with the rotation angle, allowing precise adjustment of the transmitted beam’s power.
Specifications:
| Substrate Materials | BK7, Fused Silica |
| Outer Diameter | 20mm to 200mm |
| Inner Diameter | 7.5mm, 8.0mm and 8.3mm |
| Outer Diameter Tolerance | +0.0/-0.15mm |
| Inner Diameter Tolerance | +0.15/-0.0mm |
| Thickness Tolerance | +/-0.1mm |
| Parallelism | 3’ |
| Linearity | +/-5% |
| Error of Maximum OD | +/-5% |
| Surface Quality | 80/50 S/D |
| Coating Area | 0 ~ 270° |
| Design Wavelength Range | 380nm to 2000nm (BK7)
250nm to 2500nm (Fused Silica) |
Key Features and Benefits:
1.Adjustable Attenuation:
- The circular variable ND filter allows for fine-tuned control of light attenuation by simply rotating the filter.
- The optical density (OD) increases linearly with the rotation angle, providing smooth and predictable adjustments.
2.Linear Density Relationship:
- The linear relationship between optical density and rotation angle allows for precise control, which is particularly useful for applications requiring accurate light modulation.
- Enables motorized rotation for precise logarithmic sweeps in transmitted beam power.
3.Specifications:
- Outer Diameter: Available in sizes ranging from 10mm to 200mm.
- Coating Region: Covers 0-270°.
- Optical Density Range Options: Max. OD1, Max. OD2, Max. OD3, and Max. OD4.
4.Ease of Use:
- Users can easily set the filter to achieve the desired transmitted beam power by referencing the angular markings.
- This convenience facilitates quick and accurate adjustments during experiments or industrial processes.
Applications:
- Industrial Imaging: Provides controlled illumination to prevent sensor overexposure, ensuring high-quality imaging results.
- Machine Vision: Enhances the accuracy of vision systems by controlling the amount of light reaching the sensors, which is crucial for inspection and quality control.
- Spectroscopy: Allows precise control of light intensity to avoid detector saturation and to enhance the dynamic range of spectroscopic measurements.
- Laser Experiments: Enables researchers to fine-tune the laser power for various experiments, ensuring optimal performance and safety.
Kingwin Optics supplies high-quality Circular Variable ND Filters designed for various applications. These filters offer a convenient method of adjusting beam attenuation through simple rotation. The filters are available in different sizes and optical density ranges to meet diverse requirements. The linear density relationship and motorized rotation capability make them ideal for precise and repeatable light attenuation adjustments.
