Underwater Spectral Imaging System Based on Liquid Crystal Tunable Filter

Journal of Marine Science and Engineering

Hai Gong¹  Hui Huang²  Hong Song²  Syed Raza Mehdi²  Zixin Li²  Chaopeng Wu²  Amjad Ali³ 

[1] Blackett Laboratory, Department of Physics, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;Ocean Engineering and Technology, Ocean College, Zhejiang University, Zheda Road 1, Zhoushan 316021, China;School of Electronics and Computer Engineering, Peking University, Shenzhen 518055, China;

关键词: spectral imaging;    underwater imaging;    liquid crystal tunable filter;    spectral resolution;    spectral calibration;   

DOI  :  10.3390/jmse9111206

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown