High-speed interactance scattering measurements of sweetpotato internal quality using a microgrid polarization camera

Hoang Nguyen; Ali Altaqui; Cranos M. Williams; Michael W. Kudenov

doi:10.1117/12.2623160

30 May 2022 High-speed interactance scattering measurements of sweetpotato internal quality using a microgrid polarization camera

Hoang Nguyen, Ali Altaqui, Cranos M. Williams, Michael W. Kudenov

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Proceedings Volume 12112, Polarization: Measurement, Analysis, and Remote Sensing XV; 121120K (2022) https://doi.org/10.1117/12.2623160
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

Interactance spectroscopy is a relative scattering technique that is useful for measuring the internal spectral absorption characteristics of agricultural produce. However, deploying it in high-speed scanners is challenging due to the limited radiometric output of broadband white-light sources. Further complexities relate to the need to mask the incident first-surface reflected light from the detector, so more deeply-scattered interacting photons can be measured. In this paper, we describe a multispectral laser-based line-projection configuration that enables interactance measurements without requiring an obscuration. Preliminary low-throughput and high spectral resolution measurements were taken to inform the choice of laser wavelengths. Polarization cameras are used during scanning to aid in identifying regions of maximum scattering to reduce the impact of first-surface reflections. We discuss the system’s optical design and demonstrate preliminary results from the scanner.

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Citation Download Citation

Hoang Nguyen, Ali Altaqui, Cranos M. Williams, and Michael W. Kudenov "High-speed interactance scattering measurements of sweetpotato internal quality using a microgrid polarization camera", Proc. SPIE 12112, Polarization: Measurement, Analysis, and Remote Sensing XV, 121120K (30 May 2022); https://doi.org/10.1117/12.2623160

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KEYWORDS

Scattering

Cameras

Polarization

Scatter measurement

Scanners

Optical design

Photons

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