Conveyor belt measuring system

A conveyor-belt measuring system comprising:

• a conveyor belt including:
• a plurality of resonant circuits disposed at sensor positions in the conveyor belt, each of the resonant circuits having a resonant frequency and including:
• a sensing element sensing a condition affecting the conveyor belt and changing the resonant frequency as a function of the condition affecting the conveyor belt;
• a coupling element connected to the sensing element;
• at least one stationary measurement circuit external to the conveyor belt and including:
• a frequency detector;
• and
• a stationary coupling element coacting with the coupling elements in the conveyor belt as they pass close to the stationary coupling element to couple the resonant circuits to the frequency detector;
• wherein the frequency detector measures changes in the resonant frequency of the resonant circuits caused by the condition affecting the conveyor belt.

A conveyor-belt measuring system comprising:

• a conveyor belt including:
• a plurality of sensing elements disposed at sensor positions in the conveyor belt, wherein an electrical property of each of the sensing elements is changed by a condition affecting the conveyor belt;
• at least one stationary measurement circuit external to the conveyor belt and including:
• a frequency detector;
• and
• a stationary coupling element coupling the at least one stationary measurement circuit to the plurality of sensing elements in the conveyor belt as they pass close to the stationary coupling element;
• wherein each of the sensing elements forms part of a resonant circuit having a resonant frequency that depends on the electrical property of sensing element;
• wherein the frequency detector measures changes in the resonant frequency of the resonant circuit caused by the condition affecting the conveyor belt.

A conveyor-belt measuring system comprising:

• a conveyor belt including:
• a plurality of deflection sensors disposed at sensor positions in the conveyor belt, wherein each of the deflection sensors senses deflection of the conveyor belt;
• and
• a plurality of couplers, each connected to an associated one of the deflection sensors;
• at least one stationary measurement circuit external to the conveyor belt and including:
• a stationary coupler coupling the at least one stationary measurement circuit to the plurality of deflection sensors in the conveyor belt without contact as the associated couplers in the conveyor belt pass close to the stationary coupler;
• wherein the at least one stationary measurement circuit measures the deflection of the conveyor belt sensed by each of the deflection sensors.