Method of remote detecting material

FIELD: measurement technology.

SUBSTANCE: method is based upon remote detecting of material by using distant magnetic resonance induced by electromagnet wave in the material. Response frequency is measured subsequently which response is used to judge on the presence of material. Exciting electromagnet signal is irradiated at frequency, which is much higher than frequency of magnetic resonance in material subject to detection. Irradiated exciting electromagnet signal is modulated at frequency of magnet resonance. Response is registered at modulation frequency.

EFFECT: longer distance of detection.

1 dwg

 

The technical solution relates to the physical dimensions, namely to electronic media using magnetic resonance imaging for search and discovery primarily of drugs and explosives in the composition requirements for research quantities of substances.

Known closest to the claimed method of remote detection of substances with a crystalline structure in which a remote excitation of magnetic resonance in matter, electromagnetic wave at a frequency that is inherent in this matter. Then the response (for example, ECHO signal) substances on the same frequency it detects. Remote excitation of magnetic resonance is one of the main problems is the increase of distance substances from the radiation source of the electromagnetic wave and/or reduce the power level of the electromagnetic wave [Grechishkin E, Sinyavsky NA Local resonance in solids. Advances in physical Sciences, 1993, CH, No. 10].

In the specified way remote detection substance is irradiated with an electromagnetic signal at the frequency of the magnetic resonance of this substance, then take the signal response at the frequency of the magnetic resonance substances on the response at this frequency conclude about the presence of this substance.

Potential known SPO is both detection using remote excitation of magnetic resonance in substance electromagnetic wave is limited by the distance from the emitter, where the energy level of the electromagnetic signal is sufficient to excite resonance in the substance and the subsequent reception of the signal response.

This limitation is due to the fact that the frequency of magnetic resonance imaging in crystalline substances is usually in units of megahertz (i.e. the wavelength of the signal ECHO of the order of hundreds of meters). At these wavelengths for the real emitter size of several tens of centimeters is provided a mode near-field radiation, where the radiation efficiency is extremely low. Therefore, in the apparatus described above the method detection substances, the maximum achieved a detection range of a substance is 40-60 see

The objective of the proposed technical solution is the increase of distance of distance of the detection target substance.

This is achieved by the fact that the applied method of remote detection of substances with the use of remote excitation of magnetic resonance electromagnetic wave in the substance with subsequent measurement of the frequency response, which make the conclusion about the presence of this substance, characterized in that the exciting electromagnetic signal radiating at a frequency much higher frequency of the magnetic resonance subject to detection of a substance, and modulate the emitted electromagnetic signal is polarization with a frequency of magnetic resonance, and the response recorded on the modulation frequency.

The essence of the proposed method is illustrated on the example of a device that implements this method. Functional diagram of the device shown in the drawing.

A device that implements the proposed method for remote detection of a substance contains a transmitting antenna 1, the input of which is connected to the output of the transmitter 2. On one of the inputs of the transmitter 2 includes the output of the pulse generator 3, at its other input connected to the output of the synthesizer 4, the other end of which is connected to the input of the pulse generator 3. The device also has a receiving antenna 5, the output of which is included at the input of the receiver 6, the output of which is connected to the input of the drive 7. The inputs of the receiver 6 and the memory 7 from the output of the synthesizer 4 filed with the reference voltage.

The device operates as follows.

Pulses with a frequency of fill ω1and (ω1-ω)generated in the synthesizer 4, proceed to the transmitter 3 and emitted transmitting antenna 1, made for example in the form of a horn antenna, the signal which is supplied with a round waveguide, which in turn from the transmitter 3 serves two orthogonal (polarization) components, one - on frequency ω1and the other at the frequency (ω1-ω), resulting in a radiated wave antenna 1 is modulated on the floor of the polarization of the frequency of the magnetic resonance ω .

The test substance 8, irradiated electromagnetic wave containing component at the frequency of the magnetic resonance ω, excited and at the end of the pulse irradiation emits the signal response at the same frequency. The signal response is received the receiving antenna 5, containing four ferrite rod diameter 8 mm length 138 mm, rods wound coils, containing 20 turns and connected in parallel.

The signal from the receiving antenna 5 is fed to the receiver 6, which receives also the reference voltage, the locking receiver at the time of radiation pulses. From the output of the receiver 6, the signal is sent to the drive 7, which allows to increase the distance from the receiving antenna to substances in 2-3 times. On the drive 7 is also the reference voltage, providing synchronization of stored pulses.

In the case of modulation by the polarization of the radiated signal with frequency ωequal to the frequency of the magnetic resonance substances, when the frequency of the radiated signal ω1>>ω, the intensity vectorthe magnetic field radiated electromagnetic signal contains a component

The test substance 8 will actively interact with the magnetic fieldfrequency ω [Dudkin V.,Pakhomov, LN. Foundations of quantum electronics, SPb, SPb - GTP, 2001].

Thus, the emitted electromagnetic signal modulated by the polarization of the frequency of the magnetic resonance excites magnetic resonance in matter. Because the frequency ω1can be selected high enough ω1>>ωin this case, the implementation of the transmitting antenna 1 may be implemented, for example, using the technique of antennas ultra-high frequency (SHF), which is modulated by the polarization of the signal comes from a circular waveguide, which in turn receives two linearly polarized orthogonal wavesandwhose frequencies are equal respectively ω1and (ω1-ω).

The transition to the frequency of the excitation radiation in the microwave frequency range allows you to provide the “far zone” for radiated electromagnetic signal in the range of several tens of centimeters. As a result, at distances of the order of several meters from the emitter provides a level of electromagnetic radiation, sufficient to excite resonance in the substance that provides the ultimate goal of increasing the detection range of substances. The signal response of the substance is carried out at a frequency of modulation of polarization in the us.

Method of remote detection of substances with the use of remote excitation of electromagnetic wave magnetic resonance in substance and subsequent measurement of the frequency response, which make the conclusion about the presence of this substance, characterized in that the exciting electromagnetic signal radiating at a frequency much higher frequency of the magnetic resonance subject to detection of a substance, and modulate emitted by exciting the electromagnetic signal polarization at the frequency of magnetic resonance and response register on the modulation frequency.



 

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FIELD: measurement technology.

SUBSTANCE: method is based upon remote detecting of material by using distant magnetic resonance induced by electromagnet wave in the material. Response frequency is measured subsequently which response is used to judge on the presence of material. Exciting electromagnet signal is irradiated at frequency, which is much higher than frequency of magnetic resonance in material subject to detection. Irradiated exciting electromagnet signal is modulated at frequency of magnet resonance. Response is registered at modulation frequency.

EFFECT: longer distance of detection.

1 dwg

FIELD: research nuclear magnetic resonance units.

SUBSTANCE: proposed probe has nonmagnetic case with internal chamber suited to maintain vacuum and pipeline running though this chamber. Pipeline has first section joined to second sections and disposed between the latter; second sections and first one are made of nonmagnetic materials having approximately equal coefficients of temperature expansion. High-frequency coil is mounted along at least essential portion of pipeline first section. Improved design alternate of proposed probe has its chamber accommodating field or frequency regulating unit and gas absorber for absorbing gases within chamber to maintained desired high vacuum therein.

EFFECT: enhanced precision of research and capability of using probe in continuous processes.

15 cl, 6 dwg

FIELD: radiospectroscopy.

SUBSTANCE: according to the method of detecting explosives and drugs the spot being suspected in storing matters kept in non-metal container is influenced by high-frequency magnetic field radio-frequency variable duration pulses. Frequency of carrier is close to frequency of quadrupole nuclear resonance of detected matter. Induced electromotive force is measured during periods of absence of pulses from phase-sensitive detection circuit. Response input signals are summed subsequently which signals are detected at special moments of time. Matters to be found have preset known parameters of nuclear quadrupole resonance. Duration of pulses of illuminating pulses is changed to compensate drop in sensitivity induced by non-uniformity of radio-frequency filed of illuminating coil.

EFFECT: improved capability of detection of matters in tested area.

4 dwg

FIELD: physical measurements; radio means using magnetic resonance for searching, detecting, and identifying materials.

SUBSTANCE: proposed method used for exciting magnetic resonance in material and recording it in the form of echo or induction signals is characterized in that exciting pulse signal modulated by internal pulse and/or phase obeying arbitrarily specified law is applied to material; echo or induction signal received is stored; reference signal of same shape as echo or induction signal is generated; reference signal is delayed with respect to exciting signal by time interval whose length is chosen between zero and viewing interval; stored echo or induction signal is multiplied by delayed reference signal whose shape is same as that of echo or induction signal, respectively; signal obtained as result of multiplication is integrated in time at viewing interval; magnetic resonance is recorded by peak of signal obtained after integration.

EFFECT: enlarged range of material detection.

1 cl, 1 dwg

FIELD: measuring technique.

SUBSTANCE: method comprises irradiating the substance by the first electromagnetic signal at a frequency much higher than that of the substance magnetic resonance and irradiating the substance by the second electromagnetic signal at a frequency that differs from the value of the frequency of the first electromagnetic signal by a value of the frequency of the magnetic resonance of the substance.

EFFECT: increased distance of remote exciting.

1 dwg

FIELD: medicine.

SUBSTANCE: the present innovation deals with the ways for diagnostics due to registering bioelectrical signals of the body and its parts and, also, to ways for studying the material due to detecting and studying magnetic leakage fields and could be applied in orthopedic stomatology for detecting the pliability of prosthesis bed mucosa. As a controlled parameter one should apply the index of bioelectromagnetic reactivity which should be measured in controlled points of prosthesis bed mucosa both before and during mechanical loading, after that it is necessary to obtain the difference in the values of corresponding measurements, moreover, if the difference of measured values is equal of above 1 one should characterize mucosa in the controlled point to be loose, and if the difference of the measured values is below 1 one should characterize mucosa to be dense, then one should calculate the value of mechanical coefficient of pliability (Cm) according to the following formula: Cm=((X2-X1)/M)×100(mm), where X1, X2 - the values of the indices of bioelectromagnetic reactivity in the controlled point of prosthesis bed mucosa both before and after the loading, correspondingly; M - the coefficient that takes into account the character of mucosal density which should be taken to be equal to 6.6 for the loose mucosa and 6.4 for the dense one. Application of the present innovation enables to increase the significance in detecting the pliability and simplify the method to increase the significance of the obtained information at measuring electromagnetic field in the point under studying.

EFFECT: higher accuracy of detection.

1 dwg, 1 ex, 1 tbl

FIELD: radio-technical tools which use magnetic resonance for finding and detecting primarily drugs and explosives, and also use polarization selection and phase analysis for finding and detecting drugs, packed in non-metallic cover.

SUBSTANCE: method for remote detection of a substance includes remote excitation of magnetic resonance in a substance by an electromagnetic wave and following measurement of response frequency, while exciting electromagnetic signal is emitted at frequency much greater compared to frequency of magnetic resonance of substance, and emitted excitation electromagnetic signal is modulated by polarization at frequency of magnetic resonance, and response is recorded at modulation frequency. Electromagnetic probing is performed by flat-polarized signal and signals are received with right and left circular polarization which are reflected from drug substance, while reflected signal with right circular polarization is gated on basis of time, proportional to depth of position of drug substance, and reflected signal with left circular polarization is transformed by frequency with usage of heterodyne voltage, voltage of intermediate frequency is selected, multiplied with reflected signal with right circular polarization, harmonic voltage is selected at stable frequency of heterodyne, phase shift is measured between reflected signals from right and left circular polarization at stable frequency of heterodyne, measured value of phase shift is compared to standard value and on basis of comparison result, decision is taken about presence of drug substance in hiding environment.

EFFECT: increased trustworthiness of detection and increased depth resolution when determining location of drugs.

1 dwg

FIELD: resonance radio-spectroscopy, possible use for managing and maintaining given temperature in volume of sample being examined, in particular in experiment of measurement of magnetic relaxation using nuclear magnetic resonance method.

SUBSTANCE: device for thermostatting a sample in magnetic resonance sensor contains receiving-transmitting coil, which forms the thermostatted volume, temperature sensor, connected to input of temperature control block, to output of which heating element is connected, where receiving-transmitting coil is wound on heat-isolating frame, inside which heating element is positioned, and temperature sensor is positioned directly on heating element. As heating element, hollow metallic cylinder is used with through longitudinal cut, or heat-emitting cover of thermo-resist, applied onto internal surface of heat-isolating frame and having longitudinal track 2 mm wide without cover for removing vortex current, or a coil of bifilar wire. Hollow metallic cylinder has cuts for creation of heating current channels, starting alternately at upper and lower ends of cylinder and not reaching the opposite end for distance, which approximately equals the distance between opposite cuts. Metallic cylinder may protrude beyond the limits of polar tips of magnets.

EFFECT: reduced gradient of temperatures in volumetric sample, reduced time of reaching the thermostatting mode and decreased level of electromagnetic interferences.

11 cl, 3 dwg

FIELD: physics.

SUBSTANCE: method of substance remote sensing and identification using remote magnetic resonance initiated by two series radio pulses followed by substance excited radiation (response) frequency measurement value of which indicates this substance, implies that substance is additionally irradiated by the third radio pulse with electromagnetic oscillation chirp filling at frequency which is much greater than substance magnetic resonance frequency. The third radio pulse start concurs with the second radio pulse end, and the third radio pulse end concurs with response end. Response is registered at frequency which differs from the third radio pulse filling frequency by value equal to sensed and identified substance magnetic resonance frequency.

EFFECT: extended range of remote sensing and identification of required substance.

1 dwg

FIELD: physics; measurements.

SUBSTANCE: present invention pertains to physical measurements, which use magnetic resonance for searching for and detecting mainly narcotic drugs and explosive substances. A generated ultrabroadband signal is used to irradiate the presumed place where the narcotic drugs are hidden. The reflected signal is received, and gradually stored. The antenna assembly is moved parallel the investigated surface at a fixed distance. At each observation point, at least two successive measurements of the reflected pulses are taken. The pulse, corresponding to the previous measurement, is held until it is compared with the next pulse. Their difference is determined, and the differential signal is integrated. The differential signal is divided by the integrated differential signal. The normal signal is compared to the threshold value of the signal. A narcotic substance is present if the threshold value is exceeded.

EFFECT: wider functional capabilities of the method by way of searching for and detecting narcotic drugs, packed in non-metallic covers and inside concealment environments.

1 dwg

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