doppler principle การใช้

• Doppler echocardiography utilizes the Doppler principle to estimate intracardiac velocities.
• For the Doppler principle to work there must be a high enough density of sonically reflective materials such as solid particles or air bubbles suspended in the fluid.
• However, a change in frequency will occur as a result of the Doppler principle, when a person or object is moving towards or away from the detector.
• As JORN uses the Doppler principle to detect objects, it cannot detect objects moving at a tangent to the system, or objects moving at a similar speed to their surroundings.
• The system uses FLIT ( frequency line integration tracking ) which homes in on precise narrowband frequencies of sound and, using the Doppler principle, can accurately provide firing solutions against very quiet submarines.