Abstract
We demonstrate active hyperspectral imaging using a quantum-cascade laser (QCL) array as the illumination source and a digital-pixel focal-plane-array (DFPA) camera as the receiver. The multi-wavelength QCL array used in this work comprises 15 individually addressable QCLs in which the beams from all lasers are spatially overlapped using wavelength beam combining (WBC). The DFPA camera was configured to integrate the laser light reflected from the sample and to perform on-chip subtraction of the passive thermal background. A 27-frame hyperspectral image was acquired of a liquid contaminant on a diffuse gold surface at a range of 5 meters. The measured spectral reflectance closely matches the calculated reflectance. Furthermore, the high-speed capabilities of the system were demonstrated by capturing differential reflectance images of sand and KClO3 particles that were moving at speeds of up to 10 m/s.
Highlights
Active hyperspectral imaging (A-HSI) is a method for the classification and mapping of materials based on their optical properties [1]
We demonstrate active hyperspectral imaging using a quantumcascade laser (QCL) array as the illumination source and a digital-pixel focal-plane-array (DFPA) camera as the receiver
The multi-wavelength QCL array used in this work comprises 15 individually addressable QCLs in which the beams from all lasers are spatially overlapped using wavelength beam combining (WBC)
Summary
Active hyperspectral imaging (A-HSI) is a method for the classification and mapping of materials based on their optical properties [1]. The scene is illuminated with a wavelength-tunable laser and an image of the scattered radiation is captured by a camera. The camera incorporates a digital-pixel focal plane array (DFPA) imager in which an analog-to-digital converter (ADC) is associated with each pixel of the HgCdTe detector array [20, 21]. This circuit architecture allows for very fast frame readout to enable high-speed HSI. To the best of our knowledge, this is the highest speed acquisition of a differential reflectance image and is enabled by combining the unique properties of the QCL array and DFPA camera
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