Abstract: A mechanical seal monitoring system and method that measure the wear of seal faces of a mechanical seal where the mechanical seal seals a rotating machine portion from another portion of the machine. The system preferably uses a wear probe movable relative to a rotating seal component so that the wear probe can contact the rotating component. The wear of the seal is preferably determined by the relative movement that is required for the wear probe to contact the rotating component. Preferably, stress waves induced by the rubbing between the probe and the rotating component are detected by a stress-wave sensor, processed by a signal processor, and either displayed to the user numerically or reported to a monitoring computer. A signal intensity comparison method is preferably used to make the detection process insensitive to background noise generated by sources other than the contact of the wear probe and the rotating component.

Abstract: A mechanical seal monitoring system and method that measure the wear of seal faces of a mechanical seal where the mechanical seal seals a rotating machine portion from another portion of the machine. The system preferably uses a wear probe movable relative to a rotating seal component so that the wear probe can contact the rotating component. The wear of the seal is preferably determined by the relative movement that is required for the wear probe to contact the rotating component. Preferably, stress waves induced by the rubbing between the probe and the rotating component are detected by a stress-wave sensor, processed by a signal processor, and either displayed to the user numerically or reported to a monitoring computer. A signal intensity comparison method is preferably used to make the detection process insensitive to background noise generated by sources other than the contact of the wear probe and the rotating component.

Abstract: A fuel injector testing system and method that make accurate determination of the condition of an injector installed in an engine possible even if the injector is hidden under or behind engine components. A waveguide attached to the injector guides stress waves generated when the injector pintle is opened or closed to a location on the engine that is accessible by a technician. A stress-wave sensor attached to the accessible end of the waveguide measures the stress-wave intensity and plots on a display its magnitude vs. time. A technician testing a fuel injector can read from the display the numerically accurate impact intensities and the precise timing of the injector pintle opening and closing movements. The display can also compute automatically the values of the impact intensities and the length of time that the injector valve was open. This allows the technician to quickly detect a faulty injector.

Abstract: A fuel injector testing system and method that make accurate determination of the condition of an injector installed in an engine possible even if the injector is hidden under or behind engine components. A waveguide attached to the injector guides stress waves generated when the injector pintle is opened or closed to a location on the engine that is accessible by a technician. A stress-wave sensor attached to the accessible end of the waveguide measures the stress-wave intensity and plots on a display its magnitude vs. time. A technician testing a fuel injector can read from the display the numerically accurate impact intensities and the precise timing of the injector pintle opening and closing movements. The display can also compute automatically the values of the impact intensities and the length of time that the injector valve was open. This allows the technician to quickly detect a faulty injector.