Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.

Abstract: A system for magnetic detection includes a magneto-optical defect center material including at least one magneto-optical defect center that emits an optical signal when excited by an excitation light; a radio frequency (RF) exciter system configured to provide RF excitation to the magneto-optical defect center material; an optical light source configured to direct the excitation light to the magneto-optical defect center material; and an optical detector configured to receive the optical signal emitted by the magneto-optical defect center material.

Abstract: Systems and apparatuses are disclosed for a hydrophone using a nitrogen vacancy center diamond magnetic sensor.

Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.

Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.

Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.

Abstract: A system for magnetic detection includes a magneto-optical defect center material including at least one magneto-optical defect center that emits an optical signal when excited by an excitation light; a radio frequency (RF) exciter system configured to provide RF excitation to the magneto-optical defect center material; an optical light source configured to direct the excitation light to the magneto-optical defect center material; and an optical detector configured to receive the optical signal emitted by the magneto-optical defect center material.

Abstract: A system includes an acoustic transmitter and a magnetometer. The acoustic transmitter is configured to transmit an acoustic signal through a fluid with dissolved ions. The magnetometer is configured to detect the acoustic signal through the fluid. In some embodiments, such as in a passive sonar application, the system does not include a transmitter.

Abstract: Systems and apparatuses are disclosed for a hydrophone using a nitrogen vacancy center diamond magnetic sensor.

Abstract: A variable rigidity tow cable for attaching a first vehicle with a second vehicle. The tow cable includes a tension control cable having a first end and a second end. Tension on at least one of the ends of the tension control cable can be controlled to increase or decrease the length of the tension control cable. A plurality of beads are slidingly disposed on the tension control cable between the first end and the second end. The beads are free to move relative to one another on the tension control cable when the tension control cable is slack, and the beads are engaged with each other to form a rigid structure around the tension control cable when tension is applied to the tension control cable.

Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.

Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.

Abstract: An optical alignment system is provided that simplifies the alignment of two vehicles, for example during a docking procedure, and provides visual cues indicating range to prevent accidental collision. The optical alignment system includes a horizontal array of Fresnel lenses including a first plurality of Fresnel lenses disposed on one side of a vertical axis and a second plurality of Fresnel lenses disposed on the opposite side of the vertical axis. One Fresnel lens of the first plurality and one Fresnel lens of the second plurality are spaced equidistant from the vertical axis and form a first pair, and the Fresnel lenses of the first pair are arranged so that light paths therefrom converge along the vertical axis at a first distance behind the horizontal array of lights.

Abstract: A variable rigidity tow cable for attaching a first vehicle with a second vehicle. The tow cable includes a tension control cable having a first end and a second end. Tension on at least one of the ends of the tension control cable can be controlled to increase or decrease the length of the tension control cable. A plurality of beads are slidingly disposed on the tension control cable between the first end and the second end. The beads are free to move relative to one another on the tension control cable when the tension control cable is slack, and the beads are engaged with each other to form a rigid structure around the tension control cable when tension is applied to the tension control cable.