UV Filters Description
1 Features
- Narrow spectral band: The UV filters are designed to have a narrow spectral band from 200nm to 1200nm, effectively rejecting out-of-band wavelengths.
- High peak transmission: The filters provide high peak transmission in the pass band for efficient UV detection.
- Solar-blind technology: Ideal for detecting weak UV signals against a strong background of solar radiation.
- Sharp transition: Our UV shortpass filters exhibit a sharp transition between the reflected and pass bands, ensuring high transmission.
- Wide range of applications: Used in industries such as power line monitoring, forest fire detection, atmospheric studies, and UV photography.
- General Description
Shape Optics Technologies Pte Ltd (SOT) has developed high-performance solar-blind UV filters that operate in the UV range from 200nm to 1200nm. These filters are designed for applications that require detection of weak UV signals against a strong background of solar radiation. The solar-blind UV filters have been developed with an exceptionally high peak transmission in the pass band, while maintaining a sufficient rejection ratio in the visible and near-infrared wavelength ranges. This combination allows for excellent detection sensitivity and high performance.
Our UV shortpass filters provide a sharp transition between the reflection and pass bands while maintaining very high transmission within the UV pass band. The spectral transmission properties are uniform across the entire aperture of the filters. These filters can be paired with UV longpass filters to create various transmission bands, offering flexibility in applications.
- Spectrum Transmission Curves
If standard components are not available, we offer customized services to create the filters according to your application needs. Customizations can be made based on the requested wavelengths and the desired pass band range.
- Coating Quality
Adhesion Test:
Compliant with MIL-C-675C military standards, the adhesion test involved applying a tape that meets LT-90 specifications onto the lens film layer. The tape was affixed fully and then removed vertically. This procedure was repeated three times, resulting in no blistering or peeling.
Temperature Test:
In line with MIL-C-675C specifications, test pieces were subjected to temperatures of -62±1℃ and 71±1℃. After maintaining them at room temperature (16℃~32℃) for two hours, the adhesion test was repeated, confirming no film detachment.
Abrasion Resistance Test:
Conforming to MIL-C-675C and CCC-C-440 standards, the abrasion resistance test involved a gauze tester applying a minimum force of 1.0 lbs (0.45 kg) to the film. This was repeated 25 times with gauze widths of 1/4 inch (6.4mm) and 3/8 inch (9.5mm), ensuring no damage occurred to the film surface.
Humidity Test:
Under MIL-C-675C criteria, the test piece was placed in a controlled temperature and humidity chamber set to 49 ±2℃ and 95%~100% humidity for 24 hours. The film remained intact, with no peeling, scratches, or other defects.
Solvent and Cleaning Testing:
Following MIL-C-675C specifications, test pieces were exposed to room temperature conditions (16℃~32℃) and tested with acetone and alcohol for at least 10 minutes each. After air drying and subsequent cleaning with a cotton cloth soaked in alcohol, the film surface showed no signs of peeling or scratches.
Salt Spray Test:
After 100 hours in a 35°C environment with a 5% saltwater concentration, the film showed no signs of damage.
- Standard Specifications
- Material: Fused silica
- Diameter: +0/-0.2mm
- Thickness: ±0.1mm
- Clear aperture: ≥80% of diameter
- Surface quality: 60-40 scratch and dig
- Coating type: Multi-layer dielectric coating
- Transmittance: ≥85%
- Slope: 90% – 10% < 10nm
- Blocking: Optical density, OD > 4
- General Applications and Examples
- Corona Detection on Power Lines: Detects corona discharge in power lines using the specific UV wavelength emitted.
- High Voltage Equipment Monitoring: Measures and detects UV signals emitted from arcing or sparking on electrical equipment.
- Forest Fire Monitoring: Used in detecting UV emissions from forest fires.
- Atmospheric Studies: Helps in detecting and analyzing UV radiation in atmospheric conditions.
- UV Photography: Utilized in capturing UV radiation with high efficiency for various photographic applications.
- SOT Strengths and Capabilities
Shape Optics Technologies Pte Ltd (SOT) is a leading innovator in the development of precision optical filters. Our expertise in manufacturing high-performance optical products, including solar-blind UV filters, ensures high reliability and consistency. SOT’s products are engineered to meet demanding industrial applications, with rigorous testing processes ensuring that all products meet military standards for durability and performance. SOT is committed to providing customizable solutions to meet your specific requirements, backed by professional support and technical expertise.
- Standard Products
| Center Wavelength Range: | 214-380nm |
| peak transmittance (%): | 214nm 220nm :>10% 230nm:>12% 254nm 260nm:>15% 280nm 297nm:>20% 340nm 352nm 365nm 380nm:>30% |
| FWHM: | 8nm-25nm |
| Blocking depth range(nm): | OD2-OD5@200~1100nm |
| Blocking range: | 200nm~1100 nm |
| Size: | 2mm-50mm |
| Operating temperature: | -40°C~+60°C |
| Clear aperture: | f2mm~f50mm |
Our Stock UV short pass filter Products
| Description | Cut-off (nm) | Thickness (mm) | Item# | |
|---|---|---|---|---|
| 25mm dia. | 50x50mm | |||
| Shortpass Filter / UV 265nm | 265 | 1 | XUS0265 | ZUS0265 |
| Shortpass Filter / UV 300nm | 300 | 1 | XUS0300 | ZUS0300 |
| Shortpass Filter / UV 325nm | 325 | 1 | XUS0325 | ZUS0325 |
| Shortpass Filter / UV 350nm | 350 | 1 | XUS0350 | ZUS0350 |
| Shortpass Filter / UV 350nm | 350 | 1 | XHS0350 | ZHS0350 |
| Shortpass Filter / UV 385nm | 385 | 1 | XUS0385 | ZUS0385 |
| Shortpass Filter / UV 385nm | 385 | 1 | XHS0385 | ZHS0385 |
| Shortpass Filter / UV 400nm | 400 | 1 | XHS0400 | ZHS0400 |
