An underground investigation device includes a transmission unit configured to transmit a pulse wave, a reception unit configured to receive a reflected signal, a memory configured to store time waveform data of the reflected signal, a storage device having a larger capacity than a capacity of the memory, a control unit configured to transfer the time waveform data from the memory to the storage device, and a signal processing unit configured to generate underground investigation data based on the time waveform data in the storage device. The reception unit sets a measurement span for sampling the reflected signal by using, as a trigger, transmission of the pulse wave or reception of a reflected signal resulting from reflection by a ground surface, samples the reflected signal in the measurement span, and stores the time waveform data in the memory. The control unit transfers the time waveform data from the memory to the storage device after the measurement span.

An underground investigation device includes a transmission unit configured to transmit a pulse wave, a reception unit configured to receive a reflected signal, a memory configured to store time waveform data of the reflected signal, a storage device having a larger capacity than a capacity of the memory, a control unit configured to transfer the time waveform data from the memory to the storage device, and a signal processing unit configured to generate underground investigation data based on the time waveform data in the storage device. The reception unit sets a measurement span for sampling the reflected signal by using, as a trigger, transmission of the pulse wave or reception of a reflected signal resulting from reflection by a ground surface, samples the reflected signal in the measurement span, and stores the time waveform data in the memory. The control unit transfers the time waveform data from the memory to the storage device after the measurement span.

Provided is a body of a hand-held metal detector which includes an elongated body with a first and second end; and a first connecting structure moulded directly onto the elongated body at the first end through an injection moulding process. The connecting structure includes an engaging portion configured to engage at least one attachment of the hand-held metal detector, such that the at least one attachment is supported by the elongated body through the connecting structure moulded directly onto the elongated body.

Certain exemplary embodiments can provide a device comprising an upper housing, a lower housing, an electronics module, an electronics button, a side button, and a strip magnet. The strip magnet is coupled to the lower housing. The strip magnet is constructed to cause resistance to motion across a metal fastener. The resistance to motion is perceptible to a user of the device. The resistance is indicative of a location of the metal fastener and, thereby, allows the user of the device to locate the metal fastener if the electronics module fails to detect the metal fastener.

Certain exemplary embodiments can provide a device comprising an upper housing, a lower housing, an electronics module, an electronics button, a side button, and a strip magnet. The strip magnet is coupled to the lower housing. The strip magnet is constructed to cause resistance to motion across a metal fastener. The resistance to motion is perceptible to a user of the device. The resistance is indicative of a location of the metal fastener and, thereby, allows the user of the device to locate the metal fastener if the electronics module fails to detect the metal fastener.

A metal detector that uses a verity of sensors as input for a neural network to optimize discrimination and detection of known or unknown objects. The detector will also have employ an user defined frequencies that will help to create custom settings. The detector will be able to use the sweeping motion of the detector head to create many frames of reference for understanding the composition, depth, size, type, approximant length of time it had remained, and to some extent orientation of known/unknown objects. This will be fed back to a user who can help identify the object once it is found. If it is different or new, the user can enter what it was into a database that can be used to train signals for future use, such as through using the data for training and/or updating machine learning models which can be used to accurately identify object.

A ground search metal detector, comprising a shaft, a probe, and a dual pivot axis-defining junction piece. The probe comprises an electromagnetic coil configured to generate a magnetic field. The shaft and the probe are each attached to the junction piece. The detector is configured to be adjusted between at least a first arrangement (in which the shaft is capable of pivoting relative to the junction piece about a first axis, and the probe is capable of pivoting relative to the junction piece about a second pivot axis that is non-parallel with the first pivot axis) and a second arrangement (in which the shaft is prevented from pivoting relative to the junction piece about a first pivot axis, or the probe is prevented from pivoting relative to the junction piece about a second pivot axis). Also, a probe assembly comprising a probe and a junction piece, and methods.

The invention relates to a power adjustment method and apparatus, and a human body security check device. An adjustable power attenuator is provided in a millimeter wave signal transmitting link of the millimeter wave transceiver. The method comprises: obtaining a current humidity value by detecting the ambient humidity around the millimeter wave transceiver using a preset humidity sensor; determining a target power attenuation value of the adjustable power attenuator according to the current humidity value, the sum of the target power attenuation value and a power attenuation value caused to a millimeter wave signal by the ambient humidity being a constant value; and controlling the adjustable power attenuator to adjust its power attenuation value to be consistent with the target power attenuation value. The solution can reduce radiation hazard while ensuring the definition of an image.

A method includes receiving, from a plurality of magnetic field receivers including magnetic sensors, data characterizing samples obtained by the plurality of magnetic field receivers, the samples of a combination of a first magnetic field and a second magnetic field resulting from interaction of the first magnetic field and an object; determining, using the received data, a polarizability index of the object, the polarizability index characterizing a magnetic polarizability property of the object; classifying, using the determined polarizability index, the object as threat or non-threat; and providing the classification. Related apparatus, systems, techniques, and articles are also described.

Discriminating between a cable locating signal and a false cable locating signal is described. A reference signal, which contains a locating signal frequency impressed on it, is transmitted in a way which provides for detection of a phase shift between the locating signal and the false locating signal. Based on the phase shift, a receiver is used to distinguish the locating signal from the false locating signal.