A Multi-spectral High-resolution Camera Design For Marine Red Tide Monitoring

In recent years,due to the interaction of increasingly frequent marine activities and environmental factors,the phenomenon of ocean red tide has become more and more serious.In order to maintain the marine ecological environment,the ability to obtain real-time ocean red tide monitoring data has become the key to the governance of the coastal waters.At present,marine environmental monitoring is mainly based on satellite remote sensing,which will be subject to certain time and space and weather restrictions.Therefore,this paper proposes a high-resolution imaging system for multi-spectral monitoring of red tide water bodies on airborne platforms,so as to realize real-time monitoring and treatment of red tide sea areas.First,the spectral channels of multispectral imaging in this paper are analyzed and determined based on the characteristic spectra of the ocean red tide waters.By comparing the existing spectral spectroscopy and remote sensing imaging methods,the scheme suitable for airborne multi-spectral imaging is selected,and it has the characteristics of being suitable for airborne miniaturization and light weight.With reference to the existing airborne platform system,the technical indicators to be realized in this paper are formulated,and the detector components are selected reasonably.The focal length,field of view and F number of the optical system and other system parameters are determined in consideration of the comprehensive effects including various aspects such as image illumination.Secondly,according to the system parameters that have been demonstrated,the design of the optical system is completed in ZEMAX software by selecting the double Gaussian structure as the initial structure of the system.By adding a pair of meniscus lenses to the structure and finding the best aspheric surface,the imaging quality of the system is improved to meet the index requirements.The image quality of the designed optical system was evaluated and the tolerance analysis was carried out to give a reasonable range of tolerance variables within the acceptable range of the system.Finally,the stray radiation and image plane illumination of the optical system were analyzed.By establishing the optomechanical structure model of the system,it performs stray light analysis in TracePro software to suppress the main path of stray light in the system,in order to reduce the influence of external radiation on the imaging under large off-axis angle.A special hood and a light blocking ring are designed to protect the image from stray light.At the same time,according to the existing red tide water body remote sensing data,it is verified that the imaging effect is good in the spectrum segment selected by the system.