1. Features
- High-Precision Bandpass Filtering: Provides precise wavelength selection for machine vision systems, ensuring high imaging accuracy.
- Wide Range of Wavelengths: Available in a variety of center wavelengths ranging from 405 nm to 940 nm, suitable for diverse applications.
- Excellent Transmission Efficiency: All filters offer more than 90% peak transmittance for optimal light throughput.
- Robust Performance: Features low optical density, ensuring minimal attenuation and optimal clarity.
- Customization Available: Filters can be customized in terms of size, optical density, and other parameters based on specific customer requirements.
2. General Description
Machine vision filters from Shape Optics Technologies Pte Ltd (SOT) are engineered to enhance the performance of optical systems, particularly in industrial and scientific imaging applications. These filters provide high-quality transmission across a broad spectrum of wavelengths, ensuring exceptional accuracy and clarity for imaging tasks. Machine vision filters are typically employed in environments where precise color separation or light control is essential, including automation, quality inspection, and machine learning in visual systems.
SOT’s machine vision filters are designed using advanced coating technology, resulting in high transmission rates and optimal optical density. The filters are available in various wavelength ranges to cater to different types of light sources commonly used in machine vision systems. Customization options are also offered for specific needs in terms of optical density, size, and coatings.
3. Spectrum Transmission Curves
SOT’s machine vision filters are designed for use in a variety of applications, including precise light filtering and color separation. The filters are available in wavelengths including 405 nm, 450 nm, 490 nm, 532 nm, 590 nm, 650 nm, 710 nm, and beyond. Each filter is engineered for optimal performance with peak transmittance exceeding 90%.
Customization: If the standard wavelength or specifications are not available, SOT offers customized filters based on the customer’s specific needs, including unique wavelength ranges and optical densities.
4. Coating Quality
SOT’s filters undergo stringent quality tests to meet industry standards and provide high durability for professional use:
- Adhesion Test: Filters are subjected to a tape adhesion test that meets MIL-C-675C military standards, ensuring no blistering or peeling after the tape is removed.
- Temperature Test: Filters are exposed to extreme temperatures from -62 ± 1℃ to 71 ± 1℃, showing no detachment of coatings after the tests.
- Abrasion Resistance Test: Filters undergo abrasion tests under MIL-C-675C and CCC-C-440 standards, ensuring their surfaces are durable even after 25 abrasion cycles.
- Humidity Test: Filters are placed in a chamber at 49 ± 2℃ and 95-100% humidity for 24 hours. No peeling or scratches are observed.
- Solvent and Cleaning Test: Filters are exposed to acetone and alcohol for 10 minutes each. After cleaning with a cotton cloth, the filters show no damage.
- Salt Spray Test: The filters are tested in a 5% saltwater solution for 100 hours at 35°C with no signs of damage.
5. Standard Specifications
The filters are available in the following standard specifications:
| Model | CWL (nm) | Peak Transmittance | FWHM (nm) | Optical Density | Note |
| NH-BP405/20 | 405±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Custom sizes and specifications available |
| NH-BP450/20 | 450±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Custom sizes and specifications available |
| NH-BP460/20 | 460±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Custom sizes and specifications available |
| NH-BP490/20 | 490±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Custom sizes and specifications available |
| NH-BP520/20 | 520±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Custom sizes and specifications available |
| NH-BP532/20 | 532±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Custom sizes and specifications available |
| NH-BP550/20 | 550±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Custom sizes and specifications available |
| NH-BP650/20 | 650±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Custom sizes and specifications available |
| NH-BP750/20 | 750±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Custom sizes and specifications available |
6. General Applications and Examples
Machine vision filters are crucial components in industrial and scientific applications where light filtering is necessary to separate wavelengths for accurate image capture. Some key applications include:
- Quality Inspection: In automated manufacturing, filters ensure that cameras detect specific color or wavelength signatures.
- Machine Learning: Filters improve the training of machine vision systems by focusing on specific wavelength bands for precise recognition tasks.
- Biometric Identification: Used in optical recognition systems for face or fingerprint detection based on certain wavelengths.
- Medical Imaging: These filters allow for precise analysis of images captured in different spectrums for enhanced diagnostics.
7. SOT Strengths and Capabilities
Shape Optics Technologies Pte Ltd (SOT) stands as a leader in high-precision optical solutions, specializing in custom filter designs for diverse scientific, industrial, and commercial applications. With over two decades of experience, SOT ensures that all products meet the highest standards of quality and performance. Leveraging advanced coating technologies, SOT produces filters with superior transmission efficiency and excellent durability under various environmental conditions. The company’s strong emphasis on R&D ensures continuous innovation and optimization in the field of optical filtering.
8. Standard Products
The following standard products are available in SOT’s Machine Vision Filter line:
| Model | CWL (nm) | Transmittance | FWHM (nm) | Optical Density | Custom Options |
| NH-BP405/20 | 405±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Available |
| NH-BP450/20 | 450±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Available |
| NH-BP490/20 | 490±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Available |
| NH-BP532/20 | 532±3 | T ≥ 90% | 20±5 | OD ≥ 3 @ 350-1100 | Available |
Additional customization options are available upon request, including variations in size, optical density, and specific wavelength requirements.
