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Proceedings Paper

Hyperspectral imaging microscopy with a tunable laser illumination source (Conference Presentation)
Author(s): Ronald G. Resmini; David W. Allen; E. T. Slonecker

Paper Abstract

We report on a shortwave infrared (SWIR; 900 nanometers [nm] to 2500 nm) hyperspectral imaging microscope (HSIM) based on a tunable laser illumination source―a capability we assembled in 2013, applied in 2014, and discuss in a 2018 paper in SPIE’s Journal of Applied Remote Sensing (JARS). The HSIM is a custom built system based on monochromatic laser illumination and an imager. It is a framing system; sample translation or mirror scanning is not required. The laser used is a Q-switched Nd:YAG, 10 Hz, 850 mJ at 1064 nm and a optical parametric oscillator tunable from 410 nm to 2550 nm with a linewidth <6.0 cm-1. The laser is projected free space to a diffuser and then to the sample. The imager is an HgCdTe-based camera with 14-bit radiometric resolution and a spectral response from 900 nm to 2500 nm. Its detector array is 320 by 256 with a pixel pitch of 30 µm. The lens used was a 25 mm focal length, f/1.4, optimized for use in the near-infrared/SWIR. The sensor may be raised or lowered to vary the spatial resolution. A custom written program was used for operation and data acquisition. The program controls the laser stepping sequentially through the wavelengths, triggers the camera, and collects a set of images at each wavelength. We discuss lessons learned in the HSIM’s construction and operation as well as in data processing. Data of a polished granite slab are shown and are compared to HSI data acquired with other laboratory sensors.

Paper Details

Date Published: 14 May 2019
Proc. SPIE 10986, Algorithms, Technologies, and Applications for Multispectral and Hyperspectral Imagery XXV, 109861E (14 May 2019); doi: 10.1117/12.2519082
Show Author Affiliations
Ronald G. Resmini, The MITRE Corp. (United States)
David W. Allen, National Institute of Standards and Technology (United States)
E. T. Slonecker, U.S. Geological Survey (United States)

Published in SPIE Proceedings Vol. 10986:
Algorithms, Technologies, and Applications for Multispectral and Hyperspectral Imagery XXV
Miguel Velez-Reyes; David W. Messinger, Editor(s)

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