1.Product Descriptions:
| Characteristics: | 940nm Bandpass Filter |
| Type: | Bandpass Filter |
| Central Wavelength (CWL): | 940+-5nm or specified* |
| Full Width at Half Maximum(FWHM): | 20/25/35/45/50/55/65/75/110nm |
| Peak Transmittance(%) : | BP940-20nm:>88% BP940-25nm:>90% BP940-35nm:>92% BP940-40nm:>85% BP940-45nm:>92% BP940-45nm Black Glass Substrate:>85% P940-50nm:>90% BP940-55nm:>90% BP940-65nm:>92% BP940-75nm:>92% BP940-110nm:>90% |
| Surface Quality: | 60/40 scratch-dig |
| Optical Density (OD): | OD2-OD3 |
| Color: | Black |
| Shape： | Square, Round, Irregular Shape |
| Dimension(mm): | specified** |
| Thickness(mm): | specified** |
| Substrate: | Ultra-clear glass,K9,BK7,B270,D2637T, Quartz Glass(Fused Silica) or other specified |
| Remark： Spectral range:350-1100nm *Customized capability: 380-2500nm, stock for 10nm intervals. **Common for 86x86mm, 80x80mm, other can customized, max. 300x300mm *** Thickness available: 0.21、0.3、0.55、0.7、1.0、1.1、1.5、1.8、2.0、3.0mm…etc. | |
2.Measured Spectral Graph – 940nm Bandpass filter:
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| Picture 1: BP940-20nm Spectral Graph measurement |
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| Picture 2: BP940-25nm Spectral Graph measurement |
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| Picture 3: BP940-35nm Spectral Graph measurement |
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| Picture 4: BP940-40nm Spectral Graph measurement |
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| Picture 5: Black Glass Substrate 940-40nm Bandpass Filter Spectral Graph measurement |
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| Picture 6: BP940-45nm Spectral Graph measurement |
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| Picture 7: BP940-45nm Black Glass Substrate Spectral Graph measurement |
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| Picture 8: BP940-50nm Spectral Graph measurement |
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| Picture 9: BP940-55nm Spectral Graph measurement |
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| Picture 10: BP940-65nm Spectral Graph measurement |
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| Picture 11: BP940-75nm Spectral Graph measurement |
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| Picture 12: BP940-110nm Spectral Graph measurement |
3.What is typical application for 940nm bandpass filters?
A 940nm bandpass filter is a high-precision optical element that only transmits light within a narrow spectral band centered at 940nm in the near-infrared region, while blocking all ultraviolet, visible light and other off-band near-infrared wavelengths. Typical applications for 940nm bandpass filters are very broad, include infrared sensing, infrared night vision cameras, facial recognition and access control systems. It also serves for laser ranging, industrial photoelectric detection, smart home sensors and medical optical devices. It filters out unwanted ambient light and interference, ensuring stable signal output and high detection accuracy.
4.What is key parameter when choose for right bandpass filter?
When selecting a bandpass filters, the center wavelength (CWL) will be one of key parameter to be designated, it refer to the wavelength at which the filter achieves maximum transmission. Secondly, Peak and Average Transmittance, typically ≥80–95%, higher transmittance might need Anti-reflective(AR) coating. Third, full width at half maximum (FWHM). Forth, Blocking Range & Depth. Fifth, substrate material, e.g., BK7, B270, fused silica, colored glass. Sixth, surface quality, e.g., 60/40, 40/20. Seventh, Size & Shape, etc.
Shenzhen Hengda Liyuan Optoelectronics introduced advanced optical technology that apply depositing nanomaterials through ion-assisted evaporation onto a multilayer hard film in a high vacuum environment which coating layer is firm and has good tightness, and small bandwidth drift. Liyuan optoelectronics have been focus on optical coating for more than 17 years and offer one-stop optical filters solution including Narrow Bandpass Filters, IR cut-off Filters, Longpass & Short Filters, Notch Filters, ND filters, Star filters and Optical sapphire block.
Other typical Bandpass filters in stock from Liyuan Optoelectronics include BP810 BP820 BP830 BP840 BP850 BP860 BP870 BP880 BP890 BP…etc.
