Method for measuring absorbent hygiene products

A method for measuring absorbent hygiene products, the method comprising:

• placing a plurality of absorbent bodies on a continuous web, wherein the absorbent bodies are spaced a distance from each other;
• moving the continuous web through at least one microwave resonator;
• measuring values of a shift in a resonance frequency and a spreading of the resonance frequency using the at least one microwave resonator to continuously determine the shift in the resonance frequency and the spreading of the resonance frequency;
• determining at least one of moisture and density of the plurality of absorbent bodies based on the measured values of the shift in the resonance frequency and a spreading of the resonance frequency;
• determining empty values for each of the measured values of the shift in the resonance frequency and the spreading of the resonance frequency, wherein the empty values are determined by continuously determining a local minimum value and averaging the continuously determined local minimum value with a plurality of past values of local minima;
• and
• subtracting the average local minima as the empty values from the measured values of the shift in the resonance frequency and the spreading of the resonance frequency to evaluate the measured values of the shift in the resonance frequency and the spreading of the resonance frequency to account for the distance between the absorbent bodies.