Abstract
In the past decade, underwater spectral imaging (USI) has shown great potential in underwater exploration for its high spectral and spatial resolution. This proposal presents a stare-type USI system combined with the liquid crystal tunable filter (LCTF) spectral splitting device. Considering the working features of LCTF and the theoretical model of USI, the core structure containing “imaging lens-LCTF-imaging sensor” is designed and developed. The system is compact, and the optical geometry is constructed minimally. The spectral calibration test analysis proved that the spectral response range of the system covers a full band of 400 nm to 700 nm with the highest spectral resolution between 6.7 nm and 18.5 nm. The experiments show that the system can quickly collect high-quality spectral image data by switching between different spectral bands arbitrarily. The designed prototype provides a feasible and reliable spectral imaging solution for in situ underwater targets observation with high spectrum collecting efficiency.
Highlights
The fundamental of spectral imaging is to fuse multi-dimensional spatial geometric information of the image with spectral information radiating from the target surface to obtain spectral image cube data [1]
In the 21st century, marine observation became an important debate and research topic [4,5], which presently relies on different techniques, such as satellite remote sensing based on spectral imaging, and underwater target detection based on acoustics and optical imaging
To maximize the performance and minimize the mechanical complexity of spectral imaging for underwater application, this paper presents the design and development of a stare-type underwater spectral imaging (USI) system based on liquid crystal tunable filter (LCTF)
Summary
The fundamental of spectral imaging is to fuse multi-dimensional spatial geometric information of the image with spectral information radiating from the target surface to obtain spectral image cube data [1]. In the 21st century, marine observation became an important debate and research topic [4,5], which presently relies on different techniques, such as satellite remote sensing based on spectral imaging, and underwater target detection based on acoustics and optical imaging. Since 2009, the Norwegian University of Science and Technology (NTNU), in cooperation with the Ecotone company, has started to study the applications of push-broom underwater hyperspectral imaging (UHI) based on prism splitting methods for underwater target detection [8]. Several spectral imaging techniques are being adopted to perform a wide range of underwater detection, including starring type, snapshot, and push-broom imaging methods [23]. To maximize the performance and minimize the mechanical complexity of spectral imaging for underwater application, this paper presents the design and development of a stare-type USI system based on LCTF.
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