Laser Doppler Principle is used by Laser Surface Velocimeters (LSVs) to assess the laser light that is scattered back from a moving object. The LSVs from Polytec feature advanced detection circuits ...

Police radar works on the Doppler principle; a change in the frequency of a signal in direct proportion to the speed of an object. The Doppler principle was discovered in 1842 by an Austrian physicist ...

THE object of associating these principles has been to make possible the measurement of the velocity of any phenomenon which will reflect, refract or diffract a laser beam. Our particular interests ...

As radar technology continues to advance, it offers an increasingly broad range of capabilities, making it a viable alternative to traditional passive infrared (PIR) sensors. With radar’s enhanced ...

These are the type of flow meters that measure the velocity of liquid or gas by using the principle of ultrasound or sounds waves. Fast digital signal processors and sophisticated signal analysis ...

As a student I should be much obliged to any reader for an explanation of the following difficulty. In considering Doppler's principle as applied in acoustics, we find four cases: (1) approach of ...