| 摘要 |
<p num="1"><br/><br/><br/><br/> ABSTRACT OF THE DISCLOSURE<br/>A single composite analyzer tester instrument capable of<br/>nondestructively analyzing and testing several different<br/>properties of graphite-resin materials, such as the thickness,<br/>sonic velocity, relative sonic amplitude and relative electrical<br/>conductivity thereof. The instrument incorporates therein a<br/>magnetic induction circuit for measuring the thickness of the<br/>test material, which includes a magnetic induction probe with a<br/>magnetic induction coil which is placed adjacent to the outer<br/>surface of the material. The instrument also includes an<br/>ultrasonic pulse-echo circuit for performing two separate but<br/>related tests, a measurement of the ultrasonic velocity of the<br/>test material, and also a measurement of the relative change in<br/>amplitude of an ultrasonic pulse as it traverses the test<br/>material from an outer surface thereof to an inner surface, where<br/>it is echoed back to the outer surface for detection. This<br/>circuit includes an acoustic probe which is placed adjacent to<br/>the outer surface of the test material, at the same location<br/>where the first probe was placed. Finally, the instrument<br/>incorporates therein an eddy current circuit for measuring the<br/>relative electrical conductivity of the test material. This<br/>circuit includes an eddy current probe with an eddy current coil<br/>which is placed adjacent to the outer surface of the test<br/>material at the same location as the two previous probes. The<br/>magnetic induction circuit, the ultrasonic pulse-echo circuit,<br/>and the eddy current circuit are all implemented in a single<br/>microprocessor-based unit utilizing extensive digital signal<br/>processing. Moreover, the magnetic induction probe, the acoustic<br/>probe, and the eddy current probe are each attached to, and<br/>detachable from, the console of the unit by electrical plug<br/>connections.<br/> |
