Internal scanning hyperspectral imaging system for deep sea target detection

Abstract

There is an increasing demand for advanced imaging systems in marine exploration capable of performing high-resolution spectral analysis of targets in deep-sea environments. Traditional push-broom underwater hyperspectral imaging systems obtain hyperspectral images by relying on platform movement, which limits their applicability in complex underwater conditions. To mitigate this issue, we present a novel internal scanning underwater hyperspectral imaging system. In this system, a two-stage rotating mirror mechanism is designed, achieving a maximum 36° internal scanning field of view while maintaining characteristics of direct-view, compact and simple. We analyze and correct the geometric distortions of the hyperspectral image caused by the internal scan. Calibrations and experiments show that the system operates within a spectral range of 400–1000 nm, achieving a spectral resolution better than 3 nm, and a maximum working depth of 6000 m.