Disclosed is a sensor for identifying the presence of a biological material in a sample, the sensor comprising: an antenna apparatus for transmitting and receiving microwave electromagnetic (EM) signals; a signal transmitter apparatus coupled to the antenna apparatus and arranged to transmit a microwave-frequency output signal to the antenna apparatus for emission therefrom as an output electromagnetic (EM) signal for reflection at a said sample and to receive a microwave-frequency return signal from the antenna apparatus in response to a return electromagnetic (EM) signal received thereat by reflection from a said sample; a signal processor arranged to calculate a complex-valued reflection coefficient, comprising a real component and an imaginary component, according to said return signal and said output signal, and to detect the presence of said biological material in said sample according to both the real component and the imaginary component of said reflection coefficient.

Disclosed is a sensor for identifying the presence of a biological material in a sample, the sensor comprising: an antenna apparatus for transmitting and receiving microwave electromagnetic (EM) signals; a signal transmitter apparatus coupled to the antenna apparatus and arranged to transmit a microwave-frequency output signal to the antenna apparatus for emission therefrom as an output electromagnetic (EM) signal for reflection at a said sample and to receive a microwave-frequency return signal from the antenna apparatus in response to a return electromagnetic (EM) signal received thereat by reflection from a said sample; a signal processor arranged to calculate a complex-valued reflection coefficient, comprising a real component and an imaginary component, according to said return signal and said output signal, and to detect the presence of said biological material in said sample according to both the real component and the imaginary component of said reflection coefficient.

A security check method includes: pre-creating at least four concurrently operating threads, one thread being responsible for movement control and data acquisition, one thread being responsible for imaging processing, one thread being responsible for interface displaying, and one thread being responsible for target detection and recognition; then the four concurrently operating threads divide original echo data of a human body to be checked into data of a plurality of adjacent overlapped azimuthal segments during data processing and perform individual processing on the data of each azimuthal segment. The security check system includes a thread creating unit, a first thread parallel unit, a second thread parallel unit, a third thread parallel unit, a fourth thread parallel unit, and a thread loop control unit. Because subsequent data processing is not required to be performed after the acquisition of all data is completed, the time for a security check process is reduced.

A sensor for detecting looseness of a plurality of bolts and nuts fixing parts includes: a non-conductive film attached to a surface of the part, which is one of the parts, including holes H from which the bolts are inserted; and a conductive film attached to the non-conductive film, configured to receive supply of a high-frequency signal, and having a same planar shape as that of the non-conductive film, wherein the planar shape is a shape in which a resonance frequency of the high-frequency signal confined in the non-conductive film is different according to a position of a loosened bolt, and the planar shape of the conductive film is a shape in which a distance between a bolt and an end portion of the conductive film is different for each of the plurality of bolts.

A loosening detection structure used to detect loosening of a bolt includes a material that is disposed between a fixing subject steel plate and a head portion of a metal bolt for fixing the steel plate and either attached to a seating surface of the head portion of the bolt or attached to a washer disposed between the steel plate and the head portion of the bolt, and that has electrical characteristics that vary in response to variation in a force for fastening the bolt to the steel plate.

The focus of the teachings is on using Compact ferrite antenna to detect the motion of metal objects using a very low frequency (VLF) square wave, propagated between a pair of compact ferrite-particle dielectric-core RWA antennas in free space. The two salient features in the signal are observed; both of which are characteristic of Brillouin-precursor propagation: (1) a temporal Bessel-like waveform; and (2) an algebraic, rather than exponential, attenuation with distance over three meters. The key element teaching shows pair of source and detector antenna enables the detection of metals (weapon gun, knife) on a person or package between the ferrite- particle dielectric-core antennas- source (S) and detector (D) pairs or arrays of S-D tractor. The detection consisted of a change in the amplitude of the Bessel-like waveform of the received signal for security system to detect weapons.

Footwear scanning systems and associated methods are described. According to one aspect, a footwear scanning system includes a base, a shuttle configured to rotate beneath the base, wherein the shuttle comprises an antenna array configured to transmit electromagnetic waves through the base into footwear above the base during the rotation of the shuttle and to receive electromagnetic waves reflected from the footwear during the rotation of the shuttle, a transceiver coupled with the antenna array and configured to apply electrical signals to the antenna array to generate the transmitted electromagnetic waves and to receive electrical signals from the antenna array corresponding to the received electromagnetic waves, and processing circuitry configured to process an output of the transceiver corresponding to the received electromagnetic waves to provide information regarding contents within the footwear.

Footwear scanning systems and associated methods are described. According to one aspect, a footwear scanning system includes a base, a shuttle configured to rotate beneath the base, wherein the shuttle comprises an antenna array configured to transmit electromagnetic waves through the base into footwear above the base during the rotation of the shuttle and to receive electromagnetic waves reflected from the footwear during the rotation of the shuttle, a transceiver coupled with the antenna array and configured to apply electrical signals to the antenna array to generate the transmitted electromagnetic waves and to receive electrical signals from the antenna array corresponding to the received electromagnetic waves, and processing circuitry configured to process an output of the transceiver corresponding to the received electromagnetic waves to provide information regarding contents within the footwear.

A measuring device for determining the dielectric value of a medium has at least the following components: a measuring sensor with at least one first electrically conductive electrode and a high-frequency unit which is designed to couple a high-frequency signal at least into the first electrode and determine the dielectric value of the medium using a corresponding reflection signal. The measuring device is characterized in that the first electrode is wound on a measuring rod which can be brought into contact with the medium. By winding the electrode, the measuring sensor can be advantageously configured to be significantly shorter without limiting the sensitivity of the measuring device. In this manner, the measuring device can also be used in the event of constricted installation conditions.

A measuring device for determining the dielectric value of a medium has at least the following components: a measuring sensor with at least one first electrically conductive electrode and a high-frequency unit which is designed to couple a high-frequency signal at least into the first electrode and determine the dielectric value of the medium using a corresponding reflection signal. The measuring device is characterized in that the first electrode is wound on a measuring rod which can be brought into contact with the medium. By winding the electrode, the measuring sensor can be advantageously configured to be significantly shorter without limiting the sensitivity of the measuring device. In this manner, the measuring device can also be used in the event of constricted installation conditions.