Abstract: Systems, apparatus, articles of manufacture, and methods for corrosion detection are disclosed. An example apparatus includes an adhesive to removably couple the apparatus directly to a region of a substrate; a first sensor to measure a first parameter at the region; a second sensor to measure a second parameter at the region, the first parameter and the second parameter being factors of corrosion at the region; and a power supply to provide power to the first sensor and the second sensor.

Abstract: A very low frequency (VLF) receiver is provided. The VLF receiver comprises a magnetometer that detects a magnetic field, wherein the magnetometer comprises a rubidium gas cell. Processing circuitry receives an electrical signal representative of VLF electromagnetic signals detected by the magnetometer. A multi-axis array encloses the magnetometer. The multi-axis array comprises a number of inductive coils. A closed loop current controller is connected to the inductive coils and runs on the processing circuitry. The closed loop current controller controls the magnetic field strength of the inductive coils to maintain a uniform magnetic field across the rubidium gas cell to allow the processing circuitry to detect the VLF electromagnetic signals.

Abstract: A very low frequency (VLF) receiver is provided. The VLF receiver comprises a magnetometer that detects a magnetic field, wherein the magnetometer comprises a rubidium gas cell. Processing circuitry receives an electrical signal representative of VLF electromagnetic signals detected by the magnetometer. A multi-axis array encloses the magnetometer. The multi-axis array comprises a number of inductive coils. A closed loop current controller is connected to the inductive coils and runs on the processing circuitry. The closed loop current controller controls the magnetic field strength of the inductive coils to maintain a uniform magnetic field across the rubidium gas cell to allow the processing circuitry to detect the VLF electromagnetic signals.

Abstract: A wearable apparatus includes a garment and a distributed electrical circuit. The garment includes a visible outer face directed away from a wearer and an inconspicuous inner face directed toward the wearer. The distributed electrical circuit inconspicuously integrated within the garment. The distributed electrical circuit includes a battery assembly, a microcontroller assembly, a memory assembly, a sensor assembly, a control assembly and a plurality of conductors arranged to interconnect the assemblies to form the circuit. A method of manufacturing the wearable apparatus is also provided.