Chemical Imaging with a Solid-State near Infrared Spectrometer Based on a Digital Micro-Mirror Array Device Coupled with Hadamard Transform Spectroscopy

Abstract

Chemical imaging is demonstrated by using an innovative near infrared spectrometer that uses a digital micro-mirror array device (DMD) to provide both spatial and spectral resolution. Hadamard transform spectroscopy is used to enhance the signal-to-noise ratio of the measurement compared to single point raster scanning. The concept is demonstrated by collecting a spectral image of a polymer sample composed of separate regions of polystyrene and polypropylene. The resulting image is composed of 63 spectral resolution elements across the first overtone region of the near infrared spectrum (1538–1818 nm), as well as 65 spatial resolution elements across the longitudinal direction of the DMD (11.3 mm).

Acknowledgments

The authors thank Michael J. Miller and Jonathon T. Olesberg for their contributions toward building the instrumentation spectrometer setup, Wenjiao Lin for assistance with data acquisition, and Jianchuan Zhang for engineering support related to the computerized interface. This research was supported from a grant provided by the National Institutes of Diabetes and Kidney and Digestive Diseases (DK067445)

Additional information

Notes on contributors

Dong Xiang

Dong Xiang is currently associated with Pharmaceutical and Analytical Development, Novartis Pharmaceuticals Corporation, East Hanover, New Jersey, USA.