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This is how we measure. Principle 1: Counting particles
A good analogy to explain the functionality of our sensor is the counting of particles. Each particle passing the sensor field creates a "flash". All these flashes are summed up.
Priniciple 2: Influence of velocity
The flash is not really created by the particle itself. The way we treat the reflected signal is analog to "counting the particles". We interpret the signal in a way that each flash has the same "size", as long as the particles have same sizes. This is important for measuring with different velocity.
Principle 3: Influence of particle size
If particles are bigger, the intensity of the flash is higher, because the same amount of bigger particles means a higher flow. Accordingly, twice as much half-sized particles are equally presented in the mass flow signal. This is used to minimize the effect of different particle sizes.
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