Patent ID: 6025727
Filing Date: 2000-02-15
Classification: G01N

Abstract:
A device for monitoring multiple physical properties, substantially in real time, of a fiber as it is manufactured, comprising:a sensor head having a first electrode pattern and a second electrode pattern, for placement adjacent a fiber of which multiple physical properties are to be determined as the fiber moves relative to the sensor head at industrial production speeds;a signal source for applying a high frequency signal to the sensor head to induce electric fields of opposite phase in the first and second electrode patterns the fields varying in response to changes in the multiple physical properties as the fiber passes the sensor head;a detection unit for sampling the fields at predetermined intervals, and for determining current magnitude, current phase, and voltage values thereof;a processing unit for analyzing the magnitude, phase and voltage values to extract measurements of the multiple physical properties in substantially real time; andoutput means for outputting information representing the measurements.