Magnetic detector apparatus with excitation conductors connected in series via sensor housing

• US 4,590,425 A
• Filed: 03/21/1985
• Issued: 05/20/1986
• Est. Priority Date: 06/23/1982
• Status: Expired due to Fees

• Current Assignee: Schonstedt Instrument Company
• Original Assignee: Schonstedt Instrument Company
• Inventors: Schonstedt, Erick O.
• Primary Examiner(s): Strecker, Gerard R.
• Assistant Examiner(s): EDMONDS, WARREN
• Application Number:
  US06/714,439
• Time in Patent Office: 425 Days
• Field of Search: 324/244-261, 324/323, 324/338, 324/339, 324/345, 324/346, 324/331, 324/330
• US Class Current: 324/244
• CPC Class Codes: G01R 33/022 Measuring gradient
• CPC Class Codes: G01R 33/04 using the flux-gate principle

Abstract

Magnetic detector apparatus comprises a pair of electrically matched magnetic sensor assemblies supported at opposite ends of a titanium sensor tube of significant length. The sensor tube is supported in a liquid bath so as to resist gravitational forces tending to distort the sensor tube and thereby misalign the magnetic axes of the sensors. The excitation conductors of the sensors are connected in series with an electrically conducting path formed through the sensor tube by spider members in electrical contact with the tube interior and connected to the respective excitation conductors.

Claims

1. Magnetic detector apparatus including a pair of magnetic sensor assemblies and a non-magnetic electrically conducting sensor housing supporting the assemblies in spaced apart relation, each sensor assembly including a signal winding, a magnetic core, and an excitation conductor extending along the core for exciting the same, wherein the excitation conductors are connected in series by conducting path means including the sensor housing, and wherein the excitation conductors are electrically connected to the housing at points that are separated by a large distance compared to the length of each excitation conductor.

2. Apparatus as defined in claim 1, wherein the sensor housing comprises a titanium tube.

3. Apparatus as defined in claim 1, wherein the conductive path means includes a pair of spider members within the housing, each in electrical contact with the housing and being connected respectively to the excitation conductors of the respective sensor assemblies.

4. Apparatus as defined in claim 3, wherein each spider member comprises a cup-shaped member of resilient fingers engaging the housing to provide the electrical contact and wherein each excitation conductor comprises a rod member connected to the cup-shaped member.