Topographic mapping of the South China Sea

Exhibit Introduction: This exhibit simulates a sea terrain surveying scene, using a joystick to control a ship model to move on the sea surface and observe the underwater topography; Press the tabletop button to view the explanation of echo detection technology, which not only enhances the fun and participation, but also allows visitors to understand sea echo detection technology. 1. Use a joystick to navigate the ship and view the underwater topography. 2. Press the button to learn about echo sounding technology. How to explore the depth of echoes? The echo sounder is developed based on the principle of echo ranging. The transmitting transducer emits sound pulses from the sea surface downwards. The sound pulses propagate downwards in the water and reflect when encountering seabed media with different densities. The reflected sound pulses propagate upwards in the seawater and are received by the receiving transducer on the sea surface. Based on the round-trip time of the sound pulse in seawater and its speed of sound in seawater, the straight-line distance from the transducer to the seabed, i.e. the water depth, can be calculated.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.