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Chapter 9:
Interference Filter Applications
Optical interference filters are used across a wide range of industries and academic disciplines for the purpose of selecting or excluding particular wavelengths ranges. Bandpass filters are commonly used in imaging applications to select particular color bands, such as the red, green, and blue color bands, which are combined to make true color images. This approach is commonly used in astronomy to make the breathtaking images of nebulae and other objects. In addition, by selecting filters that pass alternative color bands including nonvisible light, false color images can be created and used to explore different aspects of these objects. In the chemistry lab, materials are burned and the resulting light is analyzed through filters to identify the constituent components. Novel imaging techniques such as multispectral or hyperspectral imaging have been developed that use many closely spaced, narrow filters that are combined to create images that can be used on agricultural crops to look for the presence of problems such as disease or rot. In medicine, the rapid speed of typing and matching blood depends on the use of filters. Of course, most optics for cameras, viewing scopes, telescopes, and microscopes rely on optical filters for their operation.
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