G - Physics – 01 – N
Patent
G - Physics
01
N
73/71, 324/29.8
G01N 22/04 (2006.01)
Patent
CA 1228399
ABSTRACT OF THE DISCLOSURE Apparatus and a method for measuring moisture in plastic pellets employing microwaves transmitted through volatiles, including water vapor driven from such a polymer sample by heating same in a closed test cell. A pump is used to move a predried gas and those volatiles at an established pressure level and known flow rate to a microwave transducer. The transducer has a pair of antennae horns aimed at one another and each re- spectively supporting a microwave transmitter oscillator and receiver detector. The volatiles are the test sample which are brought transversely across the open end of the oscillator antenna horn by means of a conduit which is transparent to microwave energy. The particular orientation of the conduit is important to the accuracy of the measure- ment. A moisture absorbent material is inserted axially into the conduit to restrain the flow of volatiles through the conduit changing the vapor to liquid form. Consequently, there is resident time for the water sample in the path of the microwave energy between the transmitter and detector. The loss of microwave energy due to the vapors in the volatiles is measured at the output through the detector. The transducer through which the microwave energy passes is surrounded by a microwave energy absorbent material whereby all of the energy transmitted is either received by the detector or absorbed by the absorber or water vapor in the test sample. Calibration of the system is obtained by adjusting a zero control and setting a sensitivity control both of which influence the electronic circuitry that con- verts output to a readable form. The method requires the steps of producing volatiles from a polymer sample; transmitting them with a dry gas at a known flow rate and pressure to be acted upon by microwave energy passing between a transmitter and detector; surrounding the environs of the oscillator and detector with a microwave absorber to control the transmission of microwave energy between the oscillator and the detector; measuring the loss of microwave energy at the detector which is a consequence of the water moisture from the volatiles; absorber in the flow path of the volatile to control the resident time of the water within the transmitted microwave energy.
464091
Scully John P.
Ward Richard
Moffat & Co.
Scully John P.
Ward Richard
LandOfFree
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