Dr. Nathan A. Hagen
Assistant Professor at Utsunomiya Univ
SPIE Involvement:
Conference Program Committee | Editorial Board Member: Optical Engineering | Author | Instructor
Area of Expertise:
optical design , polarimetry , imaging spectrometry , computational sensing , aberration theory , infrared imaging
Publications (40)

Proceedings Article | 30 December 2019
Proc. SPIE. 11385, Optics and Measurement International Conference 2019
KEYWORDS: Mirrors, Light sources, Light emitting diodes, Polarization, Interferometers, Cameras, Physics, Interferometry, Wave plates, CCD cameras

SPIE Journal Paper | 15 October 2019
OE Vol. 58 Issue 10
KEYWORDS: Polarization, Cameras, Polarimetry, Beam splitters, Calibration, Video, Imaging systems, Glasses, Optical engineering, Wave plates

Proceedings Article | 6 September 2019
Proc. SPIE. 11132, Polarization Science and Remote Sensing IX
KEYWORDS: Modulation, Polarization, Birefringence, Spectroscopy, Multiplexing, Wave plates, Polarimetry, Heterodyning, Tolerancing

Proceedings Article | 6 September 2019
Proc. SPIE. 11132, Polarization Science and Remote Sensing IX
KEYWORDS: Signal to noise ratio, Polarization, Cameras, Sensors, Calibration, Fourier transforms, Polarizers, Polarimetry, Optical engineering

Proceedings Article | 6 September 2019
Proc. SPIE. 11132, Polarization Science and Remote Sensing IX
KEYWORDS: Linear polarizers, Polarization, Calibration, Quartz, Spectroscopy, Wave plates, Polarimetry, Reconstruction algorithms, Phase measurement, Temperature metrology

Showing 5 of 40 publications
Conference Committee Involvement (3)
Optical Technology and Measurement for Industrial Applications Conference
22 April 2020 | Yokohama, Japan
Optical Technology and Measurement for Industrial Applications Conference
23 April 2019 | Yokohama, Japan
Optomechatronic Actuators and Manipulation IV
17 November 2008 | San Diego, California, United States
Course Instructor
SC1212: Quantitative Imaging with Uncooled Infrared Cameras
Within the infrared community, it is widely held that uncooled sensors are incapable of doing accurate quantitative work. This course aims to show that quantitative imaging is actually possible with uncooled systems by demonstrating the steps to achieve radiometric calibration in detail and establishing the limits of what can be achieved. Throughout the course, the emphasis is on material that is practical for camera users, rather than for detector designers. The course material provides a thorough introduction into microbolometer pixel design and clarifies the differences between uncooled infrared sensors and photon-integrating sensors. Many of the examples provided are drawn from outdoor measurements, and the course provides a discussion of how to model atmospheric effects on infrared sensing in order to make sense of the thermal infrared world. Examples of quantitative measurements are drawn from the author’s work in infrared gas imaging, atmospheric sensing, and imaging of thermal dynamics.
SC1220: Imaging Spectrometry
This course covers the design and analysis of imaging spectrometers, from instrumentation to evaluation and data exploitation. After surveying the fundamentals of spectral imaging, the course provides a detailed survey of various implementations of imaging spectrometers and the benefits of each approach, with special attention to snapshot systems. Noise-equivalent spectral radiance (NESR) and other evaluation metrics are introduced and explained, providing a quantitative means of comparing systems. Finally, the course reviews commonly used algorithms for spectral imaging data and spectral classification, drawing examples from target tracking, infrared gas cloud imaging, and biological fluorescence imaging.
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