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Active hyperspectral imaging using a quantum cascade laser (QCL) array and digital-pixel focal plane array (DFPA)

Anish Goyal, Travis Myers, Christine A Wang

|July 1, 2014

Summary

This summary is machine-generated.

This study introduces active hyperspectral imaging using a quantum-cascade laser (QCL) array and a digital-pixel focal-plane-array (DFPA) camera. The system successfully imaged liquid contaminants and captured high-speed particle movement.

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Area of Science:

Optics and Photonics
Spectroscopy
Laser Technology

Background:

Hyperspectral imaging offers detailed spectral information but often faces limitations in speed and background noise.
Active imaging systems can enhance signal-to-noise ratio and enable measurements in challenging conditions.
Quantum-cascade lasers (QCLs) provide tunable, narrow-linewidth emission suitable for spectroscopic applications.

Purpose of the Study:

To demonstrate a novel active hyperspectral imaging system utilizing a multi-wavelength quantum-cascade laser (QCL) array.
To evaluate the system's capability for high-resolution spectral acquisition and background subtraction.
To showcase the system's performance in imaging static and dynamic targets at a distance.

Main Methods:

Utilized a multi-wavelength QCL array with 15 individually addressable lasers, spatially overlapped via wavelength beam combining (WBC).
Employed a digital-pixel focal-plane-array (DFPA) camera for integrating reflected laser light and performing on-chip thermal background subtraction.
Acquired hyperspectral data of a liquid contaminant on a gold surface at 5 meters and captured dynamic particle movement up to 10 m/s.

Main Results:

Successfully acquired a 27-frame hyperspectral image of a liquid contaminant, with measured spectral reflectance closely matching calculations.
Demonstrated high-speed imaging by capturing differential reflectance images of moving sand and KClO3 particles at speeds up to 10 m/s.
Validated the system's ability to perform on-chip background subtraction, improving data quality.

Conclusions:

The developed active hyperspectral imaging system, leveraging QCL arrays and DFPA cameras, is effective for spectral analysis and high-speed imaging.
The system shows promise for remote sensing and material characterization applications, even with dynamic targets.
Wavelength beam combining and on-chip background subtraction are key innovations enabling robust performance.