High-end Infrared (IR) Filters
for Research, Imaging & Production

Wide Bandpass Filters

Wide Bandpass filters isolate a very wide spectral band, simultaneously providing high transmission of desired energy, and deep rejection of unwanted energy. This type of filter is particularly used for isolating the 3-5um or 8-12um atmospheric windows and finds pop used in thermal imaging/ Industrial temperature measurement/human body sensor applications.

Wide bandpass filters can be customized to customers’ specific requirements.

Wide bandpass filters are being used in various applications including radios, home electronics projects and music production. A bandpass filter should be visualized being rounded ridge don the surface of bunch of frequencies. The frequencies under the ridge will be allowed to pass, those outside of it will not. Since the essential concept is identical, finding a bandpass filter you discover these applications is similar; to make sure dependent on manipulating the shape and positioning for the filter curve.

Modify the pass band. This is the size of the filter curve. If it were infinitely large it would allow in the full range of frequencies; if it were infinitely small it would only allow a single frequency. On most audio and electronic equipment that utilize band pass filters this can be modified with a dial. The frequencies higher and lower wide bandpass filter than the pass band will not be allowed to pass through the filter. Modify the placement of the filter along the frequency scale. The frequency scale depends on what the filter is being used for. If the filter is being used for audio applications, the frequency scale will be 20-20,000 Hz, the range of human hearing.

Modify the slope. The slope is the steepness of the ridge of the filter curve. Many bandpass filters will not cut off the ranges beyond the pass band completely, and not all filters will be able to control this slope. If the slope is wide, it will allow a wider range of frequencies that are outside of the pass wide bandpass filter , but at lower decibels than those frequencies within the pass band. The controller for this will be labeled as the slope -- it will not control the size or placement of the pass band, only its sharpness.

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