Developments in digital microwave technology for moisture measurement


Sensors which use digital microwave technology for the measurement of moisture in aggregates and cement are described. The sensors generate very low power microwave energy, and measure the change of resonant frequency caused by the water in the surrounding material. The response is linear. Digital processing provides enhanced accuracy and enables measurement over a wide range of moisture contents in materials including iron ore. A sensor version is also available in which the electronic systems are remote from the sensor head, which can then be immersed in the concrete in static and rotating pan mixers, thereby improving the sensitivity and response time.

Primary author(s): Laffan R

Source: Concrete

             Vol.37, No.2, February 2003, p.13-14


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