We present a miniature snapshot multispectral imager based on using a monolithic filter array that operates in the short wavelength infrared spectral region and has a number of defense and commercial applications. The system is low-weight, portable with a miniature platform, and requires low power. The imager uses a 4×4 Fabry-Pérot filter array operating from 1487 to 1769 nm with a spectral bandpass ∼10 nm. The design of the filters is based on using a shadow mask technique to fabricate an array of Fabry-Pérot etalons with two multilayer dielectric mirrors. The filter array is installed in a commercial handheld InGaAs camera, replacing the imaging lens with a custom designed 4×4 microlens assembly with telecentric imaging performance in each of the 16 subimaging channels. We imaged several indoor and outdoor scenes. The microlens assembly and filter design is quite flexible and can be tailored for any wavelength region from the ultraviolet to the longwave infrared, and the spectral bandpass can also be customized to meet sensing requirements. In this paper we discuss the design and characterization of the filter array, the microlens optical assembly, and imager and present imaging results.
We present a miniature snapshot multispectral imager that operates in the short wavelength infrared region (SWIR) and
has a number of applications. The system is low-weight, portable with a miniature platform and requires low power. The
imager uses a 4×4 Fabry-Perot filter array operating from 1487 to 1769 nm with a spectral bandpass ~ 10 nm. The
design of the filters is based on using a MEMS shadow mask technique to fabricate a Fabry-Perot etalon with multilayer
dielectric mirrors. The filter array subsystem is installed in a commercial handheld InGaAs camera and the imaging lens
of the camera is replaced by a custom designed 4×4 microlens array with telecentric imaging performance in each of the
16 sub-imaging channels. The imager was used to image a number of different indoor and outdoor scenes. The microlens
optics and filter design is quite flexible and can be tailored for any wavelength region from UV to LWIR and the spectral
bandpass can also be customized to meet the requirements. In this paper we will discuss the design and characterization
of the filter array, the microlens optical package, and the imager and present imaging results obtained.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.