Instrumentation

We use them to measure level. They shoot microwave energy pulses down a probe and a very precise clock is used to determine how long it takes to receive echoes back from the interface we are trying to measure. The echoes are created whenever a pulse encounters an interface with a change in dielectric properties (e.g., air/water interface). The longer it takes to receive the echo after a pulse is sent, the farther the interface is from the instrument.