Why Do These Sensors with High Dynamics Measure Better Through Foam?

While there are numerous 80 GHz Radar sensors for level measurement, VEGAPULS is the only one which measures with the high dynamic range of 120 dB. This product offers a head start when measuring applications with foam.

While “dreams are like foam,” bursting quickly like soap bubbles: this is just a saying, foam is surprisingly resistant when one tries to measure through it. This is particularly true of industrial foams, like those found in mining and chemical processes. Those supposedly fragile bubbles in shaving creams and detergents, however, also do a good job, as they are able to weaken measurement signals or completely block them.

Foam’s effect corresponds to the Radar sensors frequency range: a higher frequency means a shorter radar signal wavelength. A shorter wavelength means the radar signal is more attenuated by the foam.

A 26 GHz radar sensor has a 12 mm wavelength while, in contrast, an 80 GHz Radar sensors has a 4 mm wavelength. As a result of the 80 GHz radar sensor’s 3 times smaller wavelength, the radar signal is more strongly attenuated by a factor of 3.

However, in the VEGAPULS 80 GHz Radar sensors, the dynamic range offsets this effect. The sensor can, courtesy of its high 120 dB, detect the weaker level measurement signals attenuated by foam more reliably.

In contrast to conventional sensors, which operate with approximately 90 dB, VEGAPULS 64 operates with 120 dB. Consequently, signals are 1000 times larger, and the sensor copes significantly better with foam damping.

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