A ground search metal detector with a pivotally mounted search coil that locates a stem connector at either of a storage position or an operational position. The operational position locates the connector adjacent to the central portion of the search coil to facilitate useful operational characteristics, and the storage position locates the connector adjacent to the perimeter edge to facilitate compact storage of the metal detector by pivoting the stem to overlap the search coil.

A system for generating a buffer zone around a buried asset at an above surface location is provided. The system includes an electromagnetic locator device for generating a plurality of buried asset data points via a plurality of radio frequency antennas. The system also includes a server for generating a plurality of connected line segments that represent a geographical position of the buried asset, wherein the plurality of connected line segments are generated by executing an optimization algorithm based on the plurality of buried asset data points, wherein the optimization algorithm: i) minimizes a total number of line segments, ii) minimizes a distance between a line segment and a corresponding buried asset data point, iii) minimizes instances of line segments that are parallel and iv) minimizes line segments shorter than a predefined threshold, and generates a first data structure that represents a two dimensional area comprising a buffer zone.

Signal generation devices including an auto-tuning electronic circuit module for generating tuned output signals are disclosed. The auto-tuning electronic circuit module may include a tunable resonant electronic circuit element for providing a tuned output signal, including a voltage divider element and a tuning array element and control element.

Signal generation devices including an auto-tuning electronic circuit module for generating tuned output signals are disclosed. The auto-tuning electronic circuit module may include a tunable resonant electronic circuit element for providing a tuned output signal, including a voltage divider element and a tuning array element and control element.

Omnidirectional electromagnetic signal inducer (“omni-inducer”) devices are disclosed for generating utility locating current signals, at one or more frequencies in on or more time intervals.

Apparatus and techniques are disclosed relating to towing marine equipment. In some embodiments, a vessel tows equipment through a body of water using a towing member with an associated fairing that includes a slit, such that an axis of the slit is non-perpendicular to a portion of the towing member from which the fairing extends.

Apparatus and techniques are disclosed relating to towing marine equipment. In some embodiments, a vessel tows equipment through a body of water using a towing member with an associated fairing that includes a slit, such that an axis of the slit is non-perpendicular to a portion of the towing member from which the fairing extends.

The invention discloses a semi-airborne time domain electromagnetic exploration system for an unmanned aerial vehicle, and belongs to the technical field of geophysical electromagnetic exploration. The system comprises a ground high-power electromagnetic field source emission subsystem, a semi-airborne time domain electromagnetic exploration and observation subsystem and a data processing interpretation software subsystem, wherein the ground high-power electromagnetic field source emission subsystem comprises an IGBT full bridge, a PWM control circuit, a rectification filter circuit and a protection circuit; the semi-airborne time domain electromagnetic exploration and observation subsystem comprises an unmanned aerial vehicle, a receiving coil and a receiver; the data processing interpretation software subsystem comprises a system function module and a bottom layer supporting module, and the bottom layer supporting module is used for providing a universal performance function for the system function module. The system adopts a grounding line source, is relatively easy to arrange, supplies large current to the ground, is large in detection depth, makes the receiving coil fly in the form of a serpentine line parallel to a wire source, can maintain an equal offset distance of each measuring line, and makes data processing and inversion interpretation relatively simple.

The invention discloses a semi-airborne time domain electromagnetic exploration system for an unmanned aerial vehicle, and belongs to the technical field of geophysical electromagnetic exploration. The system comprises a ground high-power electromagnetic field source emission subsystem, a semi-airborne time domain electromagnetic exploration and observation subsystem and a data processing interpretation software subsystem, wherein the ground high-power electromagnetic field source emission subsystem comprises an IGBT full bridge, a PWM control circuit, a rectification filter circuit and a protection circuit; the semi-airborne time domain electromagnetic exploration and observation subsystem comprises an unmanned aerial vehicle, a receiving coil and a receiver; the data processing interpretation software subsystem comprises a system function module and a bottom layer supporting module, and the bottom layer supporting module is used for providing a universal performance function for the system function module. The system adopts a grounding line source, is relatively easy to arrange, supplies large current to the ground, is large in detection depth, makes the receiving coil fly in the form of a serpentine line parallel to a wire source, can maintain an equal offset distance of each measuring line, and makes data processing and inversion interpretation relatively simple.

A printed circuit card assembly (PCBA) configured for retrofitting a conventional electromagnetic locator device (ELD) for a simulator system is provided. The PCBA includes a printed circuit board (PCB), data connectors, each data connector configured for communicatively coupling with a separate one of antenna amplifiers on the conventional ELD, a low-power radio frequency (RF) receiver for receiving emulated electromagnetic (EM) field data, a processor for reading the emulated EM field data that includes constituent parts, wherein each constituent part corresponds to EM field data for a specific one of the antenna amplifiers on the conventional ELD, disassembling the emulated EM field data into its constituent parts, and transmitting to the antenna amplifiers, via the data connectors, the constituent part of the emulated EM field data that corresponds to said antenna amplifier, thereby emulating an EM field on the conventional ELD.