Automatic threshold control means and the use thereof
AssigneeAcoustic Emission Technology Corporation
InventorCarroll F. Morais
Life of this patent
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Abstract
A threshold actuated information detection system comprising a noise level converter, and a non-inverting voltage totalizer, and a voltage comparator interconnected such that the comparator will not trigger any logic circuit if an amplified signal is lower than the threshold level, and the use thereof in acoustic emission and other informational discriminating systems.
Claims15
An acoustic emission apparatus for the detection and/or location of structural flaws comprising sensor means, and means for receiving signals emitted from said sensor means and for determining the location of flaws in the workpiece being monitored, the improvement comprising an automatically variable threshold voltage level control means connected to said means for receiving signals from said sensor means.
An acoustic emission apparatus comprising a plurality of sensor means for detecting stress waves in the object being monitored, and means for continuously varying the threshold voltage level in proportion to the noise level as the noise level rises, falls or remains constant interconnected therewith.
An automatically variable threshold voltage level control means, comprising means for varying the threshold voltage level in proportion to the noise level as the noise level rises, falls or remains constant connected to a threshold reference voltage controller.
An improved threshold actuated information detection system comprising in combination:
- a peak detector noise level converter adapted to receive an amplified signal, a non-inverting voltage summer interconnected to said converter, and to a threshold reference voltage control, and a voltage comparator interconnected to said summer and adapted to receive the same amplified signal as the converter.
The method of automatically controlling the threshold voltage in a threshold actuated information detection system comprising:
- a. Generating a voltage equal to or greater than the background noise;
- b. Summing a predetermined threshold voltage level with the voltage of step (a);
- c. Comparing the summed voltage with a signal input voltage,
- d. Controlling the actuation of a system responsive apparatus below the threshold voltage.
In a microseismic detection system, comprising detection means, amplification means and a threshold level voltage generator, the improvement which comprises at least one automatically controlled threshold level actuating means for each channel of detection, and at least one channel of detection for each automatically controlled threshold level actuating means.
Dependencies are inferred from the claim text.