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The FMCW radar emits a high frequency signal whose frequency increases linearly during the measurement phase (called the frequency sweep). The signal is emitted, reflected from the measuring surface and received with a time delay, t. Delay time, t = 2d/c, where d is the distance to the product surface and c is the speed of light in the gas above the product, For further signal processing the difference is calculated from the actual transmit frequency and the receive frequency. The difference is directly proportional to the distance.