Method and system for wavelength-dependent imaging and detection using a hybrid filter

Abstract

An object (206) to be imaged or detected is illuminated by a single broadband light source or multiple light sources emitting light at different wavelengths. The light is detected by a detector (200), which includes a light-detecting sensor (400) covered by a hybrid filter. The hybrid filter includes a multi-band narrowband filter (516) mounted over a patterned filter layer (508). The light strikes the narrowband filter (516), which passes light at or near the multiple wavelengths of interest while blocking light at all other wavelengths. The patterned filter layer (508) alternately passes the light at one particular wavelength while blocking light at the other wavelengths of interest. This allows the sensor (400) to determine either simultaneously or alternately the intensity of the ligth at the wavelengths of interest. Filters (902) may also be mounted over the light at the light sources to narrow the spectra of the light sources.

Description

technical field [0001] Embodiments in accordance with the present invention relate generally to the field of imaging. More specifically, embodiments in accordance with the present invention relate to wavelength dependent imaging and detection methods and systems utilizing hybrid filters. Background technique [0002] A large number of applications focus on detecting or imaging objects. Object detection determines the presence or absence of an object, while imaging results in an image of the object. Depending on the application, objects can be imaged or detected in daylight and / or in the dark. [0003] Wavelength-dependent imaging is a technique for imaging or detecting objects, and generally involves detecting one or more specific wavelengths reflected by or transmitted by an object. In some applications, only sunlight or ambient lighting is required, while in others, auxiliary lighting is required. Light travels through the atmosphere at many different wavelengths, incl...

AI Technical Summary

Problems solved by technology

If measurements at different wavelengths are taken at different times, movement of the object during successive measurements can distort the measurement and render it useless

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