BN940 Narrow Near-IR Bandpass Filter

Description

BN940 Narrow Near-IR Bandpass Filter

BN940 Narrow Near-IR Bandpass filters feature a narrow band design with improved blocking of unwanted light and greater insensitivity to short shifting, making them particularly essential when 940nm lighting is used together with a short focal length camera lens.

940nm LEDs are commonly used in remote control devices and in security/surveillance lighting. 940nm illumination is often considered “covert,” as little if any faint red glow is produced from these LEDs, even in complete darkness. Unfortunately CMOS and CCD cameras have greatly reduced sensitivity at these wavelengths, and strong ambient light can often make imaging in this range very difficult.

The Benefits of Filters – One Filter, Works Twice as Hard

Single & Dual Bandpass Filters by MidOpt

• MidOpt Dual Bandpass filters transmit two specific wavelength ranges while blocking unwanted light, eliminating the need for a second camera or costly filter switching mechanisms.
• Dual and single band filters for NDVI imaging have been created with specific vegetative reflection bands and camera spectral response in mind. Most popular plant health indices can be accommodated. Even lower cost consumer cameras can be easily converted or modified for monitoring vegetation. In order to reduce weight, standard thickness is 1mm.
• Dual Bandpass filters also allow use of color cameras for both day and night imaging, even in complete darkness. A broad visible pass band is designed to mimic that of the camera’s original IR blocking filter, while an infrared band is also provided to match popular infrared LED illuminator wavelengths. 735nm, 850nm and 940nm dual band filters are available.
• Using a DB940 filter, commensurate IR lighting produces virtually no visible signature while daytime color rendition is uncompromised. Suitable applications include security surveillance, traffic monitoring, license plate recognition, 3D point cloud imaging and game tracking.
• After the color camera’s internal IR blocking filter has been removed, dual or single band filters can be provided in threaded aluminum mounts, black Deirin slip-on filter mounts or in custom sizes and thicknesses for mounting between the lens and the sensor.

About MidOpt

A manufacturer of custom precision optical components and systems since 1988, Midwest Optical Systems (MidOpt) is the worlds leading resource for off-the-shelf and custom machine vision filters, lenses and accessories used in industrial imaging applications. Security, surveillance, scientific, medical and other markets are also served. MidOpt has an extensive history in optical component design, fabrication and inspection, and continues to develop innovative new products for industrial vision and CCTV end users.