In-line metallic debris particle detection probe and resonant evaluation system utilizing the same

Abstract From the Canadian patent

A probe for use in detecting individual metallic particles carried by a fluid continuously flowing in an elongated passage and including an inductive coil surrounding the passage. The inductive coil is electrically configured as a single-turn electric conductor which has a length as considered in the longitudinal direction of the passage that at least equals the diameter of the conductor and has a gap extending over the entire length of the conductor and physically separating two longitudinally extending portions of the conductor from one another. A capacitor is situated directly at the gap is electrically, connected between the portions of the conductor and is isolated from the passage.