Abstract: A system including a transmitter mounted inside a pressure bulkhead of a drill tool transmitting a light at a first wavelength is provided. The system includes a receiver mounted inside the pressure bulkhead to detect a second light at a second wavelength. The system also includes a wavelength multiplex unit positioned within the first pressure bulkhead for coupling the light at the first wavelength and the light at the second wavelength with an optical coupler. The optical coupler provides the light at the first wavelength to an external medium via a pressure resistant window and receives the light at the second wavelength from the external medium via the pressure resistant window. A method of using the above system to transmit and receive messages in a downhole optical link is also provided.

Abstract: A system including a transmitter mounted inside a pressure bulkhead of a drill tool transmitting a light at a first wavelength is provided. The system includes a receiver mounted inside the pressure bulkhead to detect a second light at a second wavelength. The system also includes a wavelength multiplex unit positioned within the first pressure bulkhead for coupling the light at the first wavelength and the light at the second wavelength with an optical coupler. The optical coupler provides the light at the first wavelength to an external medium via a pressure resistant window and receives the light at the second wavelength from the external medium via the pressure resistant window. A method of using the above system to transmit and receive messages in a downhole optical link is also provided.

Abstract: A magnetostrictive transducer system included as part of a drill string for use downhole in a well to convey signals across regions of the drill string that preclude the use of wired communication elements. The magnetostrictive transducer conveys a carrier signal as an acoustic wave through a drill collar region to an acoustic telemetry receiver, which passes an output both to an uphole processing system and back into the magnetostrictive transducer system. The output signal and carrier signal are compared to determine sub-harmonics or higher order harmonics of the output or carrier signal indicative of offset in the magnetostrictive core of the magnetostrictive transducer system, and provides a corrective component signal to automatically adjust the magnetostrictive core though preloading forces.

Abstract: A system including a transmitter mounted inside a pressure bulkhead of a drill tool transmitting a light at a first wavelength is provided. The system includes a receiver mounted inside the pressure bulkhead to detect a second light at a second wavelength. The system also includes a wavelength multiplex unit positioned within the first pressure bulkhead for coupling the light at the first wavelength and the light at the second wavelength with an optical coupler. The optical coupler provides the light at the first wavelength to an external medium via a pressure resistant window and receives the light at the second wavelength from the external medium via the pressure resistant window. A method of using the above system to transmit and receive messages in a downhole optical link is also provided.

Abstract: A magnetostrictive transducer system included as part of a drill string for use downhole in a well to convey signals across regions of the drill string that preclude the use of wired communication elements. The magnetostrictive transducer conveys a carrier signal as an acoustic wave through a drill collar region to an acoustic telemetry receiver, which passes an output both to an uphole processing system and back into the magnetostrictive transducer system. The output signal and carrier signal are compared to determine sub-harmonics or higher order harmonics of the output or carrier signal indicative of offset in the magnetostrictive core of the magnetostrictive transducer system, and provides a corrective component signal to automatically adjust the magnetostrictive core though preloading forces.

Abstract: A system including a transmitter mounted inside a pressure bulkhead of a drill tool transmitting a light at a first wavelength is provided. The system includes a receiver mounted inside the pressure bulkhead to detect a second light at a second wavelength. The system also includes a wavelength multiplex unit positioned within the first pressure bulkhead for coupling the light at the first wavelength and the light at the second wavelength with an optical coupler. The optical coupler provides the light at the first wavelength to an external medium via a pressure resistant window and receives the light at the second wavelength from the external medium via the pressure resistant window. A method of using the above system to transmit and receive messages in a downhole optical link is also provided.