Patent ID: 9057754
Filing Date: 2015-06-16
Classification: G01B,G01R,G01V

Abstract:
1. A magnetic locator device, comprising: a housing element; a first three-axis magnetic sensor device disposed in the housing element; a second three-axis magnetic sensor device disposed in the housing element, wherein the second three-axis magnetic sensor device is positioned above the first three-axis magnetic sensor device in the housing element when the housing element is in a vertical orientation; and a circuit board module coupled to the first three-axis magnetic sensor device and the second three-axis magnetic sensor device, wherein the circuit board module is configured to compare output signals from the first three-axis magnetic sensor device and the second three-axis magnetic sensor device so as to determine a magnetic field distortion caused by a ferromagnetic object; wherein the device is configured so that the first three-axis magnetic sensor device and the second three-axis magnetic sensor device may be calibrated such that the measured B-field magnitudes from the first three-axis magnetic sensor device and the second three-axis magnetic sensor devices are matched in one or more magnetic field directions.