Sensor and Detector Filters are engineered for high-performance visible and infrared detection systems, enabling precise wavelength selection and accurate signal discrimination. These filters are widely used in gas sensing, environmental monitoring, Raman spectroscopy, and spectral analysis applications.
By accurately defining transmission and reflection bands, the filters enhance photodetector response while suppressing unwanted background radiation. Advanced multi-layer dielectric coatings are employed to compensate for wavelength-dependent sensitivity variations—particularly in silicon photodiodes—resulting in improved detector uniformity, stability, and measurement accuracy.
With extensive customization capabilities, SOT sensor and detector filters can be optimized for specific gas absorption lines, including CO₂, CH₄, CO, and N₂O, making them ideal for mission-critical analytical and monitoring systems.
Key Features
- High Detection Efficiency – Precise spectral selectivity for accurate gas sensing and optical analysis
- High Transmission Performance – Optimized passbands for stable and repeatable measurements
- Broad Application Coverage – Suitable for online and real-time VIS–IR detection systems
- Customizable Wavelengths – Tailored designs for specific gases and detector characteristics
- Durable Dielectric Coatings – Long service life with stable performance in harsh environments
Spectrum Transmission
Standard transmission curves are available for common detection wavelengths.
When standard designs do not meet system requirements, custom spectral solutions can be developed to precisely match required center wavelengths, bandwidths, and blocking levels.
Coating Quality & Reliability
All Sensor and Detector Filters undergo stringent environmental and durability testing:
- Adhesion Test (MIL-C-675C) – No blistering or peeling after tape removal
- Thermal Cycling – −62 °C to +71 °C with no coating detachment
- Abrasion Resistance (MIL-C-675C / CCC-C-440) – No surface damage under 1.0 lb load
- Humidity Test – 95–100% RH for 24 hours without defects
- Solvent Resistance – Stable after acetone and alcohol cleaning
- Salt Spray Test – 100 hours at 35 °C, 5% salt concentration with no degradation
Typical Applications
- Toxic Gas Detection – CO₂, CH₄, CO, N₂O, and industrial gases
- Water Quality Analysis – Chemical and biological contaminant detection
- Environmental & Atmospheric Monitoring – Air quality and pollution control
- Ranging & Laser Detection Systems – Enhanced signal discrimination
- Spectral & Raman Analysis – Improved detector sensitivity and accuracy
Standard Specifications
| Parameter | Specification |
|---|---|
| Materials | Fused silica, BK7, silicon (custom substrates available) |
| Dimensions | Ø2 mm to Ø55 mm (custom sizes on request) |
| Flatness | λ/4 |
| Surface Quality | 60-40 |
| Operating Temperature | −40 °C to +60 °C |
| Custom Wavelengths | VIS–IR, including gas absorption bands |
Standard Products
| Material | Wavelength | Reflectivity | Spot Diameter | Product Code |
|---|---|---|---|---|
| Silicon | 10.6 µm | >99.4% | Ø7 / Ø10 / Ø15 / Ø20 / Ø25 / Ø30 | SS-1064-01 |
| Fused Silica | 1064 nm | >99.7% | Ø5 / Ø8 / Ø10 / Ø15 / Ø20 / Ø30 | FS-1064-01 |
| BK7 | 532 nm | >99.7% | Ø5 / Ø8 / Ø10 / Ø15 / Ø20 / Ø30 | BK-532-01 |
| Fused Silica | 532 nm | >99.7% | Ø5 / Ø8 / Ø10 / Ø15 / Ø20 / Ø30 | FS-532-01 |
Additional wavelengths, materials, and dimensions are available upon request.