Optimization of a hyperspectral imaging system for rapid detection of microplastics down to 100 µm

MethodsX

Yugo Kanaya¹  Chunmao Zhu²  Masashi Tsuchiya²  Tomo Kitahashi³  Hidetaka Nomaki⁴  Katsunori Fujikura⁴  Ryota Nakajima⁴ 

[1] Corresponding author.;Earth Surface System Research Center, Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama 2360001, Japan;Institute for Extra-cutting-edge Science and Technology Avant-garde Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka 2370061, Japan;Marine Biodiversity and Environmental Assessment Research Center, Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka 2370061, Japan;

关键词: A rapid microplastic detection system based on hyperspectral imaging;   

DOI  :  

来源: DOAJ

【 摘 要 】

Plastic pollution has become one of the most emergent issues threating aquatic and terrestrial ecosystems. However, it is still challenging to rapidly detect small microplastics. Here, we present a method to rapidly detect microplastics using hyperspectral imaging in which we optimized a commercially available hyperspectral imaging system (Pika NIR-640, Resonon Inc., USA). The optimizations included: (1) changing the four-lamp assembly to a symmetrical set of converged-light near-infrared lamps that are placed sideways instead of above the sample stage; (2) adopting a macro-photography technique by applying an extension tube between the camera and the lens, and moving the lens of the hyperspectral camera to the imaging target (working distance of ~3 cm); (3) adjusting the exposure and aspect ratio by tuning the frame rate and scan speed of the imaging system. After optimization, the detection resolution of each pixel improved from 250 µm to 14.8 µm. With the optimized system, microplastics down to 100 µm in size were rapidly detected. This result is promising for the application of our new method in the accelerated detection of microplastics and will contribute to a better understanding of the microplastic pollution situation. • A commercially available hyperspectral imaging system is optimized for rapid detection of microplastics. • Infrared lamps are used and macro-photography technique adopted along with adjustments of exposure. • Microplastics down to 100 µm in size could be detected with the optimized system.

【 授权许可】

Unknown