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This paper describes the early development of autonomous vehicle for undersea exploration at depths of as much 1000 m. It is to combine several methods of propulsion, including wheels and legs.
Hong Kong has a unique marine environment. The intermixing of low salinity water, from the nearby Pearl River estuary outflows, with sea water from three different marine currents producing a variety of varying marine environmental conditions at different times of the year. Hoi Ha Wan is a shallow, small, enclosed bay in the north-east corner of Hong Kong. It has been designated a Marine Park primarily...
The monitoring of environmental parameters of Hong Kong waters has usually been achieved by accumulating collected data from single point sources just below the sea surface, once or twice a month by the Hong Kong Environmental Protection Department. There has also been some experimentation involving data loggers placed on the seabed. However all of the above data collecting methods produce only historical...
This paper discusses design considerations for a water cooled high acceleration 3-phase air-cored brushless DC PM linear actuator used in a vacuum radiation environment. Radiation can cause damage to magnets, and the requirement for a vacuum chamber around the moving parts imposes additional constraints that further complicate the electromagnetic and mechanical design of the actuator. This paper discusses...
DataBuoyTM I, a three dimensional, real-time marine environment monitoring system with connection to the internet, has been developed by the Department of Electronic Engineering, City University of Hong Kong (CityU). This equipment can multiplex up to five sensors placed at different depths in the water column for monitoring of temperature, salinity and light intensity. It was installed on a site...
An underwater surveillance camera has been designed for monitoring fish species activity on an inshore coral reef in a Marine Park in Hong Kong. The system consisted of a high-resolution camera. It was connected to the shore base station via a fibre-optic cable with power conductors. The camera could record video on a DVD recorder with hard disk in real time. The system was designed to be used for...
Differential optical flow methods are widely used within the computer vision community. They are classified as being either local, as in the Lucas-Kanade method, or global, such as in the Horn-Schunck technique. Local differential techniques are known to have robustness under noise, whilst global techniques are able to produce dense optical flow fields. We will show that the Horn-Schunck Technique,...
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