Research On Scheimpflug Lidar System For Underwater Profile Measurement And Red Tide Fluorescence Measurement

With the rapid development of tourism in coastal areas and improvement of people's production level,marine pollution has gradually become an increasingly prominent topic.Marine resources such as shells and coral reefs have been severely damaged and marine environment has been seriously polluted by red tides,which directly affects people's life.Therefore,monitoring the growth of marine life and early warning of red tide is of great significance to the protection of ocean.Based on Scheimpflug lidar technology,underwater profile measurement system and red tide fluorescence measurement system are independently developed,which respectively realizes the profile detection of marine organism and early warning monitoring of red tideConsidering the refraction of light at the air-water interface,the theory of refraction correction for underwater profile detection system is derived.A preliminary experiment is performed on a Cardiidae,a Tridacna and a coral branch,which proves the high precision of system.After the preliminary test,a synchronization 3D profile reconstruction experiment for two Cardiidae at different distances is also taken to verify the large depth of field of system.Based on the red tide fluorescence measurement system,the common toxic algae——Phaeocystis globosa is tested.In order to simulate the concentration variation of Phaeocystis globosa during red tide period,algae solution of seven different concentrations are prepared in proportion.Combined with the algorithm to analyze fluorescence curves,the prediction model for concentration of Phaeocystis globosa is established with a prediction accuracy of 100%,which proves the reliability of system.