what is DOPPLER SPEED LOG?

What is DOPPLER SPEED LOG?

DOPPLER SPEED LOG is a device that is utilized in ships for measuring the speed of water under the keel. An acoustic speed log based on the Doppler effect in which the wave lengths of moving objects appear to shift in relation to the observer. This shift can be converted to speed, thereby giving a very accurate result.
DOPPLER SPEED LOGs are used to measure the speed of water flow around the ship's hull. The device uses the doppler effect to measure the change in frequency of sound waves that are sent into the water and reflected back to the device. The frequency of the reflected waves is affected by the speed and direction of the water flow. By measuring the shift in frequency, the DOPPLER SPEED LOG determines the speed of the water relative to the ship, which in turn gives the ship's speed relative to the water.
In addition to speed measurements, DOPPLER SPEED LOGs can also provide information regarding the ship's heading or course over ground. This is achieved by calculating the angle of the water flow in relation to the ship's heading.
The DOPPLER SPEED LOG has several advantages over other methods of speed measurement. For instance, it is not affected by changes in water density or temperature, which can have an impact on other speed measuring devices. The DOPPLER SPEED LOG is also more accurate at low speeds than other devices, such as paddle wheels. Furthermore, the DOPPLER SPEED LOG can operate in deep water and at high speeds, making it a versatile tool for use in various water conditions.
In conclusion, DOPPLER SPEED LOG is a vital tool used on ships for measuring the speed of water flow around the hull. The device uses the doppler effect to measure the change in frequency of sound waves that are reflected off the water, which in turn provides accurate speed and course information to the ship's crew. DOPPLER SPEED LOG is a valuable tool for safe navigation at sea.