Description
HWB4 infrared filter belongs to infrared transmission visible absorption glass. It is a selective absorption optical glass filter that can selectively transmit infrared light while almost completely blocking visible light.
Appearance: Usually black. This color design is to effectively cut off visible light and reduce the interference of visible light to infrared imaging or other infrared applications.
Performance characteristics
Optical performance: According to the data of Nantong Yinxing Optical Co., Ltd., the transmittance of HWB4 filter at 400nm wavelength is ≤0.1%, at 700nm wavelength is ≤5.0%, at 800nm wavelength is ≤38.0%, and at 860nm, 900nm and 1100nm wavelengths, the transmittance is ≥75.0%.
Physical properties: The thickness is generally 1mm, with good chemical stability, and the bubble, streak and stress level are C-B 4 3
Working Principle
Material Absorption: The base material of the HWB4 filter itself has absorption characteristics for different wavelengths of light. It has a strong absorption effect on light in the visible light band, making it difficult for visible light to pass through, while it has a weak absorption effect on light in the infrared light band, allowing infrared light to pass through.
Thin Film Interference: During the manufacturing process of the filter, multiple layers of thin films are formed on the glass surface through processes such as vacuum coating. The thickness and refractive index of these films are carefully designed so that infrared light of a specific wavelength interferes and strengthens between the thin film layers, making it easier to pass through the filter, while light of other wavelengths is blocked due to destructive interference.
Application areas
Security monitoring: In security monitoring cameras, HWB4 infrared filters allow infrared light to pass through. Together with infrared lamps, the camera can capture clear images at night or in low-light environments, improving the effectiveness and reliability of monitoring.
Infrared temperature measurement: Used in infrared temperature measuring instruments, it can filter out visible light interference and only allow infrared radiation emitted by the human body or objects to pass through, thereby accurately measuring temperature.
Night vision products: For equipment such as night vision devices, HWB4 filters can ensure that only infrared light enters the imaging system, allowing users to clearly observe objects at night or in dark environments. It is widely used in military, outdoor adventure and other fields.
Infrared communication: In infrared communication equipment, HWB4 filters can filter out light interference from other wavelengths to ensure accurate transmission and reception of infrared signals.
Industrial detection: In some industrial detection applications, such as detection of surface temperature distribution of objects, non-destructive detection of internal defects of materials, etc., HWB4 infrared filters can help extract infrared image information and assist in analyzing and judging product quality and equipment operation status.
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