Abstract
A gauge has been designed for measuring currents in the lower boundary layer of the ocean. Simple construction, low cost and small power consumption are its main attractions. The meter operates on a temperature differential between a pair of diffused silicon transistor sensors, where advantage is taken of the near linear dependence of the base emitter voltage on temperature. One of the transistors is cooled by the flow, which is controlled by a standard round nose Pitot tube housing, while the other acts as a thermal reference. The functions of the flow sensing and thermal reference transistors can be reversed depending on the sign of the current's direction. The voltage response is shown to be inversely proportional to the free stream velocity, depending on the inlet Reynolds number of the gauge head. By means of an array of heads the direction and magnitude of the free stream velocity field can be established.
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