CN102133106B - Method for conducting fast and automatic nondestructive testing (NDT) to heroin hidden in human body - Google Patents

Abstract

The invention relates to a method for detecting heroin hidden in a human body, in particular to a method for conducting fast and automatic nondestructive testing (NDT) to heroin hidden in a human body, which is characterized by comprising the following steps: 1) preparing testing equipment; 2) adopting a human body model with hidden heroin as a sample to detect scattering maps of a detector at different angles, and establishing a standard database of the human body model with hidden heroin; 3) adopting a human body model as a sample to detect scattering maps of the detector at different angles, and establishing the standard database of the human body model; and 4) adopting detected human body as the sample in the step 1), taking the scattering map of a detected target in the step 2) at the same scattering angle as a coherence function map, analyzing signal features of high frequency band to be determined whether the human body contains heroin if the coherence function analysis has a peak value at the high frequency band, otherwise, the heroin is not existed in the human body. The method can fast, accurately detect whether the heroin is hidden in the human body without destruction.

Description

The heroin of hidden in human body is carried out the method for fast automatic Non-Destructive Testing

Technical field

The present invention relates to physics's energy dispersion X ray scattering nucleus Detection Techniques field and computer digit signal processing theory field, particularly relate to a kind of combining with coherent function with the energy dispersion X-ray diffraction and the heroin of hidden in human body is carried out the method for fast automatic Non-Destructive Testing.

Background technology

Drugs are poison that the devil is used for drawing human soul, and it has become large public hazards of mankind nowadays.It not only destroys people's will, personality and intuitive knowledge, and serious harm is healthy, and makes people's crime, is social non-persistent key factor.In recent years, drug smuggling activity all over the world is becoming increasingly rampant, and offender's traffic in drugs means are cunning changeable, and the traffic in drugs maneuver is modernization, intelligent increasingly.Particularly utilizing human body Tibetan poison to smuggle transportation is difficult to be found because it has disguise.Invent a kind of quick, harmless, extremely urgent to the detection method that whether keeps drugs inside and outside the human body accurately.

One, the lossless detection method of more common drugs mainly contains:

1, radioscopy detection method

This is the most traditional detection method, comprises that the back of the body is loose.Adopt X ray to luggage and parcel perspective imaging, the safety inspector judges by the shape profile of observing article in the image.Its advantage is that technology is simple ripe, cheap, is suitable for surveying metal; Its shortcoming is to fail to report, misrepresent deliberately the rate height, can not the resolution of complex background in relative quantity illegal article less, even can't detect drugs.

2, digital X-ray imaging technique

The digitized video technology is introduced in the x-ray imaging system, adopted highly sensitive CCD and X ray conversion screen, realize high-resolution digital picture, the auxiliary dangerous materials identification software that uses can improve speed and the accuracy of identification.But this method still can not the resolution of complex background in the less illegal article of relative quantity, can not differentiate the illegal article that are hidden in behind the high z number material (hereinafter to be referred as high Z material).

3, dual intensity (multipotency) X ray technology

On the basis of basic X ray through-transmission technique, use two transmission modules, the beam that is produced two different energy levels by a radiographic source forms two different images.Material according to different materials, density is different to the attenuation degree of different energy level X ray, and the dampening information in two images is considered, and can judge the constituent of material.This technology can obtain the effective atomic number information of checking matter, improves the material resolution capability of system, but the object that it stacks in still can not the resolution of complex background, and can not measure exactly atomic number owing to can not measure the concentration of material.

4, neutronic analyse detection technique

By the neutron energy spectrum of measurement transmission or reflection, or secondary gamma spectrum, judge according to the characteristics of C in the drugs (carbon) content apparently higher than other usual articles.Yet neutron is a kind of particle that is bound to arouse fear after all, and it is relatively more difficult that neutron is carried out radiation protection, if the personnel's of assurance safety certainly will cause the huge too fat to move of system.In addition because drug ingredient and some organic compositions are very approaching, so rate of false alarm is high.

5, associated particle imaging (API) technology

Be on the basis of neutronic analyse Detection Techniques, the fast neutron that produces take nuclear reaction T (d, n) 4He is as probe, interacts with the atomic nucleus of the elements such as C, N and O (oxygen), carries out inelastic scattering, produces gamma-rays.By measuring these gamma-ray power spectrum and intensity, can obtain C, N in the tested article and the content of O element, and then whether infer Poison.Also there is the problem that is difficult to distinguish with some Organic substances in this technology.

6, nuclear quadrupole resonance (NQR) technology

Be similar to nuclear magnetic resonance technique, but do not need magnetic field.After parcel enters measuring coil, produce radio-frequency pulse through control, so that nitrogen molecular produces the NQR resonant frequency in the sample, carry out obtaining frequency spectrum behind the Fourier transform, can judge exactly according to frequency spectrum whether explosive is arranged.If but contraband metal full-shield can not play a role when electromagnetic wave can't penetrate, and it is limited to carry out the dangerous materials kind of practical detection.

7, gas phase analysis method

Only higher for some explosive such as dynamite accuracy of detection, for camouflage, seal preferably that dangerous materials can't detect.This method also is difficult for realizing online the detection simultaneously.

8, bioassay method

Directly use the olfactory sensation of the animals such as housebroken Canis familiaris L., can detect some type contraband.But sensitivity changes greatly with individuality, and can not long-time continuous use.

Two, coherent function

Coherence Function Analysis is based upon autopower spectral density function s _x(ω), s _y(ω), and cross-spectral density function s _Xy(ω).Coherent function is defined as follows:

${\mathrm{\γ}}_{\mathrm{xy}}^2\left(\mathrm{\ω}\right)=\frac{{\left|s_{\mathrm{xy}}\left(\mathrm{\ω}\right)\right|}^2}{s_x\left(\mathrm{\ω}\right)s_y\left(\mathrm{\ω}\right)}$ $0\≤{\mathrm{\γ}}_{\mathrm{xy}}^2\left(\mathrm{\ω}\right)\≤1---\left(1\right)$

Coherent function claims again coherency function, and it describes the dependency of signal x (t) and y (t) in frequency domain.

Have clear and definite physical significance, it has reflected that the component of signal y (t) medium frequency ω to what extent derives from signal x (t).When

Illustrate that signal y (t) frequency is that the component of ω derives from signal x (t) fully, is called fully relevant; When

Illustrating that signal y (t) and x (t) are that the component of ω is altogether irrelevant about frequency, is to add up independently.S in 1 formula _x(ω), s _y(ω), s _XyBeing calculated as follows (ω):

$s_x\left(\mathrm{\ω}\right)={\∫}_{-\∞}^{\∞}{R}_x\left(\mathrm{\τ}\right)e^{-\mathrm{j\ω\τ}}\mathrm{d\τ}$

$s_y\left(\mathrm{\ω}\right)={\∫}_{-\∞}^{\∞}{R}_y\left(\mathrm{\τ}\right)e^{-\mathrm{j\ω\τ}}\mathrm{d\τ}$

$s_{\mathrm{xy}}\left(\mathrm{\ω}\right)={\∫}_{-\∞}^{\∞}{R}_{\mathrm{xy}}\left(\mathrm{\τ}\right)e^{-\mathrm{j\ω\τ}}\mathrm{d\τ}$

The calculating of power spectrum has direct method and indirect method, and direct method is period map method, and computational methods are as follows: the spectrum that direct method estimates When data length N is larger, the spectral line aggravation that rises and falls, N too hour, the resolution of spectrum is bad again, therefore need to be improved, what this paper adopted is Weich (1) method, the method is the improvement to the Bartlett method, the principle of calculating is sampled data x _N(n) be divided into the L section, every section length all is M, and the Weich method allows every segment data to have part overlapping, and every segment data also can not adopt rectangular window, for example can adopt Hanning window, is designated as d ₂(n).Every section power spectrum

Calculate by the following method:

${\hat{S}}_{\mathrm{PER}}^i\left(\mathrm{\ω}\right)=\frac{1}{\mathrm{MU}}{\left|\underset{n=0}{\overset{M-1}{\mathrm{\Σ}}}{x}_N^i\left(n\right)d_2\left(n\right)e^{-\mathrm{j\ωn}}\right|}^2$

In the formula $U=\frac{1}{M}\underset{n=0}{\overset{M-1}{\mathrm{\Σ}}}{d}_2^2\left(n\right).$

Summary of the invention

The object of the present invention is to provide a kind of method that the heroin of hidden in human body is carried out fast automatic Non-Destructive Testing, the method can be fast, harmlessly to whether hiding heroin in the human body survey.

For achieving the above object, the technical solution used in the present invention is: to the method that the heroin of hidden in human body carries out fast automatic Non-Destructive Testing, it is characterized in that it comprises the steps:

1) preparation of checkout equipment: checkout equipment comprises x ray generator, divergent slit collimator, anti-scatter slit and receives slit collimator, detector, MCA and computer system; X ray generator, divergent slit collimator are positioned at a side of sample, and the divergent slit collimator is between x ray generator and sample; Detector, anti-scatter slit and reception slit collimator are positioned at the opposite side of sample, and anti-scatter slit and reception slit collimator are between sample and detector; The signal output of detector is linked to each other with the signal input of MCA by holding wire, and the signal output of MCA is linked to each other with the signal input of computer system by holding wire;

2) be concealed with the anthropometric dummy of heroin in described sample adopts; Open x ray generator, the calibration light path, penetrate sample behind the X ray incident beam process divergent slit collimator that x ray generator produces, adjust the also angle of fixed detector, the photon that penetrates the scattered beam behind the sample forms scattered beam and is detected device and receives through (shining) anti-scatter slit with after receiving slit collimator, detector carries out energy resolution with the transfer of data that receives to MCA, MCA transfers data to the scatter pattern (shown in black curve among Fig. 4) that computer system is carried out date processing and obtained the object of surveying (being concealed with the anthropometric dummy of heroin namely), record the scatter pattern under the detector different angles, be concealed with the H-anim data base of heroin in the foundation;

3) sample adopts anthropometric dummy; Open x ray generator, the calibration light path, penetrate sample behind the X ray incident beam process divergent slit collimator that x ray generator produces, adjust the also angle of fixed detector, the photon that penetrates the scattered beam behind the sample forms scattered beam and is detected device and receives through (shining) anti-scatter slit with after receiving slit collimator, detector carries out energy resolution with the transfer of data that receives to MCA, MCA transfers data to the scatter pattern (shown in red curve among Fig. 4) that computer system is carried out date processing and obtained the object of surveying (being anthropometric dummy), record the scatter pattern under the detector different angles, set up the H-anim data base;

4) sample step 1) adopts detected human body, open x ray generator, the calibration light path, penetrate sample behind the X ray incident beam process divergent slit collimator that x ray generator produces, adjust the also angle of fixed detector, the photon that penetrates the scattered beam behind the sample forms scattered beam and is detected device and receives through (shining) anti-scatter slit with after receiving slit collimator, detector carries out energy resolution with the transfer of data that receives to MCA, MCA transfers data to the scatter pattern that computer system is carried out date processing and obtained the object of surveying (i.e. detected human body), get the step 2 under the identical scattering angle) in the scatter pattern of the object of surveying make the coherent function collection of illustrative plates, the signal characteristic of analysis of high frequency section, if Coherence Function Analysis has a peak value (being that coherence factor is high) at high band, so just can conclude that detected human body contains heroin, otherwise just not have.

For accurately, with step 4) in the scatter pattern and step 3 of the object of surveying [namely detected human body]) in the scatter pattern [can from the H-anim data base, mention] of the object of surveying [being anthropometric dummy] under the identical scattering angle do Coherence Function Analysis, the signal characteristic of analysis of high frequency section, if Coherence Function Analysis has a peak value (being that coherence factor is high) at high band, so just can conclude in the detected human body does not have heroin.

Described computer system 10 forms (data acquisition software 103, data processing software 104 and drugs data base 105 consist of drugs pattern recognition data base) by computer hardware 101, computer control software 102, data acquisition software 103, data processing software 104, drugs data base 105; Computer system 10 realizes the strength control to the X-ray light source by the voltage and current size of the high voltage power supply of computer control software 102 control x ray generators; And run to by computer control software 102 control detectors and to detect the angle of scattering position; Gathered from the signal that detector obtains by 103 pairs of MCAs of Computercontrolled data acquisition software, realize surveying the energy detection of sample; By 104 pairs of detection data dissection process of computer control data processing software, obtain energy dispersion X ray scattering data; From energy dispersion X ray scattering data, extract the strong feature in peak position, peak shape, peak (drugs data base 105 sets up according to the PDF card of drugs) of scattering peak; And carry out Digital Signal Processing and algorithm for pattern recognition according to peak position, peak shape, the strong feature in peak and process; Drugs differentiation comparison is carried out in processing according to algorithm for pattern recognition, if there are drugs, the drugs pattern of then having stored according to drugs data base 105 is classified, and reports preliminary recognition result.

The energy dispersive X-ray diffraction can detect the diffraction pattern of sample accurately and rapidly, but the diffraction maximum of None-identified heroin in the scatter diagram of the heroin of hiding in the anthropometric dummy that obtains with the method.The present invention utilizes anthropometric dummy as instrument, with the method that the energy dispersion X-ray diffraction combines with coherent function the heroin of hiding in anthropometric dummy and the anthropometric dummy is surveyed and is analyzed.Purpose be exactly set up a cover can fast detecting, harmless, accurately to whether drug hidden is reported to the police in the human body novel detection analysis method.

X-ray diffraction is that the structure of matter is analyzed most important means, drugs are pulverous mostly, it is small powder crystal, the crystal face of a pile powder crystal is random alignment, under the X-ray irradiation, always there is the orientation of some crystal faces can meet the condition that produces the diffraction decorative pattern, therefore can obtains the diffraction decorative pattern of different powder crystals.Can judge the kind of sample with this diffraction decorative pattern.

The Bragg formula relation between scattered x-ray wavelength X, scatteringangleθ and the scattering parameter q:

$q=\frac{1}{\mathrm{\λ}}\sin \left(\frac{\mathrm{\θ}}{2}\right)=\frac{E}{\mathrm{hc}}\sin \left(\frac{\mathrm{\θ}}{2}\right)$

H, c are Planck's constant and the light velocity in the formula, and E is the energy of scattered photon.When fixing scatteringangleθ, adopt the research method of the X-ray spectrum irradiation sample of continuous wavelength to be energy dispersion X ray scattering method.

Compare with existing method, the present invention has following beneficial effect:

1, the inventive method is surveyed the heroin of hiding in the anthropometric dummy based on energy dispersion X-ray diffraction method, and the data that detection obtains are carried out Treatment Analysis with coherence Functions Method to data.That the method has is easy to operate, survey rapidly, accurately, strong interference immunity, safe and reliable, the miniaturization and the portability that are easy to protect, be convenient to realize instrument.

The present invention adopts x ray generator (X ray white light source) and has the detector formation energy dispersion detection system device of high energy resolution, need not the rotation detection device in the testing process, do not need complicated machinery, help to realize the miniaturization of checkout gear, portability.Reduced detection time, improved detection sensitivity, can within unusual short time, obtain the X ray energy dispersion data of detecting objects, in conjunction with And Methods of Computer Date Processing, can realize to drugs automatically, accurately, quick nondestructive detects.Thereby be applicable to safety detection to human body.

2, each the bar spectral line in the power spectrum all records simultaneously, the diffracted beam that is transmitted into detector by survey object (being heroin) is processed without any optical filtering and monochromatization, thereby kept original intensity, because this two reasons is to record the power spectrum required time with the energy dispersion instrument very short, and not high x-ray source and the measuring system of degree of stability also can be used.

3, the present invention adopts commercially available conventional X-ray tube (x ray generator) as X source, makes the method device therefor convenient, and construction, maintenance cost are cheap.

4, the present invention adopts the energy dispersion method, does not need sampling, can directly detect the detection of a target, has avoided the troublesome operation of sampling and sample preparation, can be used as an easy inspection method of non-destructive, non-contact detection.

5, in the situation that has anthropometric dummy to disturb, heroin is difficult to directly identify, and adopts the method for coherent function effectively to identify heroin.

Description of drawings

Fig. 1 is the X ray light path sketch map that the inventive method is used.

Fig. 2 is the Computer Systems Organization block diagram of the inventive method.

Fig. 3 is the energy dispersion X ray scattering energy spectrum figure of salt (NaCl) under different angle of scatterings.

Fig. 4 is that anthropometric dummy can spectrogram from the energy dispersion X ray scattering contrast of the interior heroin of hiding of anthropometric dummy under different angle of scatterings.

Fig. 5 is the Coherence Function Analysis collection of illustrative plates; (a) is the coherent function collection of illustrative plates of two groups of stochastic signals of heroin in 7 ° of anthropometric dummies under the angle of incidence among Fig. 5, (b) being the coherent function collection of illustrative plates of two groups of stochastic signals of heroin in 8 ° of anthropometric dummies under the angle of incidence, (c) be heroin and with the coherent function collection of illustrative plates of anthropometric dummy under the angle in the anthropometric dummy at random.

The specific embodiment

To the method that the heroin of hidden in human body carries out fast automatic Non-Destructive Testing, it comprises the steps:

1) preparation of checkout equipment: as shown in Figure 1, checkout equipment comprises x ray generator, divergent slit collimator, anti-scatter slit and receives slit collimator, detector, MCA and computer system; X ray generator, divergent slit collimator are positioned at a side (such as the left side) of sample, and the divergent slit collimator is between x ray generator and sample; Detector, anti-scatter slit and reception slit collimator are positioned at the opposite side (such as the right side) of sample, and anti-scatter slit and reception slit collimator are between sample and detector; The signal output of detector is linked to each other with the signal input of MCA by holding wire, and the signal output of MCA is linked to each other with the signal input of computer system by holding wire;

2) be concealed with the anthropometric dummy of heroin in described sample adopts; Open x ray generator (the voltage and current size of regulation and control x ray generator, realization is to the control of the intensity of light source), the calibration light path, (X ray incident beam irradiation is penetrating sample on the sample with after the sample interaction to penetrate sample behind the X ray incident beam process divergent slit collimator that x ray generator produces, scattering occurs in the crystal face at sample), adjust the also angle (angle between detector and the horizontal plane of fixed detector, it also is the angle of incidence of detector receiving scattered light bundle, also be referred to as angle of scattering), the photon that penetrates the scattered beam behind the sample forms scattered beam and is detected device and receives through (shining) anti-scatter slit with after receiving slit collimator, detector carries out energy resolution with the transfer of data that receives to MCA, MCA transfers data to the scatter pattern that computer system is carried out date processing and obtained the object of surveying, shown in black curve among Fig. 4, record the scatter pattern under the detector different angles (angular range is 5～20 °), be concealed with the H-anim data base of heroin in the foundation.

3) sample adopts anthropometric dummy; Open x ray generator (the voltage and current size of regulation and control x ray generator, realization is to the control of the intensity of light source), the calibration light path, (X ray incident beam irradiation is penetrating sample on the sample with after the sample interaction to penetrate sample behind the X ray incident beam process divergent slit collimator that x ray generator produces, scattering occurs), adjust the also angle (angle between detector and the horizontal plane of fixed detector, it also is the angle of incidence of detector receiving scattered light bundle, also be referred to as angle of scattering), the photon that penetrates the scattered beam behind the sample forms scattered beam and is detected device and receives through (shining) anti-scatter slit with after receiving slit collimator, detector carries out energy resolution with the transfer of data that receives to MCA, MCA transfers data to the scatter pattern that computer system is carried out date processing and obtained the object of surveying (being anthropometric dummy), shown in red curve among Fig. 4, record the scatter pattern under the detector different angles (angular range is 5～20 °), set up the H-anim data base;

4) sample step 1) adopts detected human body, open x ray generator (the voltage and current size of regulation and control x ray generator, realization is to the control of the intensity of light source), the calibration light path, (X ray incident beam irradiation is penetrating sample on the sample with after the sample interaction to penetrate sample behind the X ray incident beam process divergent slit collimator that x ray generator produces, scattering occurs), adjust the also angle of fixed detector, the photon that penetrates the scattered beam behind the sample forms scattered beam and is detected device and receives through (shining) anti-scatter slit with after receiving slit collimator, detector carries out energy resolution with the transfer of data that receives to MCA, MCA transfers data to the scatter pattern that computer system is carried out date processing and obtained the object of surveying, get the step 2 under the identical scattering angle) in the object of surveying scatter pattern be concealed with namely heroin the H-anim data [from step 2) in be concealed with the H-anim data base of heroin extract] make coherent function collection of illustrative plates (employing has the coherent function method now and makees the coherent function collection of illustrative plates), the signal characteristic of analysis of high frequency section, what high-frequency signal reacted is the crystal characteristic distribution situation of material XRD spectrum, has certain rule in statistics, if Coherence Function Analysis has a peak value (being that coherence factor is high) at high band, so just can conclude that human body contains heroin, otherwise just not have.

5) for accurately, with step 4) in the scatter pattern and step 3 of the object of surveying [namely detected human body]) in the scatter pattern [can from the H-anim data base, mention] of the object of surveying [being anthropometric dummy] under the identical scattering angle do Coherence Function Analysis, the signal characteristic of analysis of high frequency section, what high-frequency signal reacted is the crystal characteristic distribution situation of material XRD spectrum, has certain rule in statistics, if Coherence Function Analysis has a peak value (being that coherence factor is high) at high band, so just can conclude in the detected human body does not have heroin.

Described computer system 10 forms (data acquisition software 103, data processing software 104 and drugs data base 105 consist of drugs pattern recognition data base) by computer hardware 101, computer control software 102, data acquisition software 103, data processing software 104, drugs data base 105; Computer system 10 is by the voltage and current size of the high voltage power supply of computer control software 102 control x ray generators, realization is to the strength control of X-ray light source, by the light path control device to divergent slit collimator, anti-scatter slit collimator and receive the size of slit collimator and mutual spacing from control regulate spot size; And run to by computer control software 102 control detectors and to detect the angle of scattering position; Gathered from the signal that detector obtains by 103 pairs of MCAs of Computercontrolled data acquisition software, realize surveying the energy detection of sample; By 104 pairs of detection data dissection process of computer control data processing software, obtain energy dispersion X ray scattering data; From energy dispersion X ray scattering data, extract the features (drugs data base 105 sets up according to the PDF card of drugs) such as peak position, peak shape, the peak of scattering peak is strong; And carry out Digital Signal Processing and algorithm for pattern recognition is processed according to features such as peak position, peak shape, peak are strong; Drugs differentiation comparison is carried out in processing according to algorithm for pattern recognition, if there are drugs, the drugs pattern of then having stored according to drugs data base 105 is classified, and reports preliminary recognition result.

X ray generator adopts X-ray machine, and the intensity of light source can be regulated, and goes for the detection to human body.Computer system is with the correlation function analysis program.The energy resolution solid probe that detector adopts is high purity germanium detector or silicon drift (SDD) detector.

Fig. 3 is the energy dispersion X ray scattering energy spectrum figure of salt (NaCl) under different angle of scatterings.NaCl (analytical pure) makes standard specimen, the reliability of detection system and accuracy.Pure compound X ray diffracting data storehouse-PDF (PowderDiffraction File) card according to joint committee (International Centre for Diffraction Data) editor, distribution, determine that angle of scattering is 5 °, 6 °, 7 °, 8.5 ° and tests, may detect most diffraction maximums of NaCl, as shown in Figure 3.Therefore, be feasible with this energy dispersion X ray scatterometer detection material.

According to shown in Figure 1, sample is respectively the heroin of hiding in anthropometric dummy, the anthropometric dummy.Regulate the X ray light path, under 5 °, 6 °, 7 ° and 8 ° of angle of scatterings, the heroin of hiding in testing human model, the anthropometric dummy respectively obtains energy dispersion X ray scattering data separately, as shown in Figure 4.Red curve is the energy dispersion X ray scatter pattern of anthropometric dummy, and black curve is the energy dispersion X ray scatter pattern of hiding heroin in the anthropometric dummy.Although from figure, can find the diffraction maximum of several heroin, be difficult to and well being distinguished of anthropometric dummy, therefore must adopt specific signal Recognition Algorithm or model.The representative of abscissa among the figure be that the x photon of different wave length is equally spaced from low to high, different wave length has different energy.Therefore, can become the abscissa equivalence time of time domain waveform to distribute, and vertical coordinate obviously can equivalence become amplitude, so just can more conveniently come the recognition feature signal with time frequency analyzing tool.

A among Fig. 5, b are respectively the coherent function collection of illustrative plates of hiding two groups of stochastic signals of heroin in the anthropometric dummy under 7 °, 8 ° angle of incidence, and Fig. 5 c hides heroin and with the coherent function collection of illustrative plates of anthropometric dummy under the angle at random the anthropometric dummy.The common ground of Fig. 5 a, b, c is higher at the coherence factor of low-frequency range (angular coordinate 0-0.3), the signal of low-frequency range is mainly the profile of XRD spectrum, the profile that different materials is corresponding different by the analysis of low-frequency range coherence factor, can be determined the substance classes that comprises in the signal qualitatively.But when XRD composed from two or more material, the low-frequency range coherence factor just can accurately not distinguished specific material.Therefore the signal characteristic of analysis of high frequency section again, a, b scheme c among relative Fig. 5 among Fig. 5, and it is in 2.943 these frequency ranges higher coherence factor to be arranged that a, b collection of illustrative plates also have a common characteristic, is respectively 0.8874 and 0.761.What high-frequency signal reacted is the crystal characteristic distribution situation of material XRD spectrum, has certain rule in statistics, therefore the XRD spectrum of hiding heroin in any two groups of anthropometric dummies under the identical angle of diffraction has a peak value (being that coherence factor is high) in angular coordinate 2.943 these frequency ranges, and c figure does not have this characteristic peak.Fig. 5 illustrate method of the present invention can be fast, accurately, harmlessly to whether hiding heroin in the human body survey.

Claims (2)

1. the heroin of hidden in human body is carried out the method for fast automatic Non-Destructive Testing, it is characterized in that it comprises the steps:

1) preparation of checkout equipment: checkout equipment comprises x ray generator, divergent slit collimator, anti-scatter slit and receives slit collimator, detector, MCA and computer system; X ray generator, divergent slit collimator are positioned at a side of sample, and the divergent slit collimator is between x ray generator and sample; Detector, anti-scatter slit and reception slit collimator are positioned at the opposite side of sample, and anti-scatter slit and reception slit collimator are between sample and detector; The signal output of detector is linked to each other with the signal input of MCA by holding wire, and the signal output of MCA is linked to each other with the signal input of computer system by holding wire;

Described computer system is comprised of computer hardware, computer control software, data acquisition software, data processing software, drugs data base; Computer system realizes the strength control to the X-ray light source by the voltage and current size of the high voltage power supply of computer control software control x ray generator; And run to by computer control software control detector and to detect the angle of scattering position; By Computercontrolled data acquisition software MCA is gathered from the signal that detector obtains, realize surveying the energy detection of sample; To the detection data dissection process, obtain energy dispersion X ray scattering data by the computer control data processing software; From energy dispersion X ray scattering data, extract the strong feature in peak position, peak shape, peak of scattering peak; And carry out Digital Signal Processing and algorithm for pattern recognition according to peak position, peak shape, the strong feature in peak and process; Drugs differentiation comparison is carried out in processing according to algorithm for pattern recognition, if there are drugs, the drugs pattern of then having stored according to the drugs data base is classified, and reports preliminary recognition result;

2) be concealed with the anthropometric dummy of heroin in described sample adopts; Open x ray generator, the calibration light path, penetrate sample behind the X ray incident beam process divergent slit collimator that x ray generator produces, adjust the also angle of fixed detector, the photon that penetrates the scattered beam behind the sample forms scattered beam and is detected device and receives through the anti-scatter slit with after receiving slit collimator, detector carries out energy resolution with the transfer of data that receives to MCA, MCA transfers data to the scatter pattern that computer system is carried out date processing and obtained the object of surveying, record the scatter pattern under the detector different angles, be concealed with the H-anim data base of heroin in the foundation;

3) sample adopts anthropometric dummy; Open x ray generator, the calibration light path, penetrate sample behind the X ray incident beam process divergent slit collimator that x ray generator produces, adjust the also angle of fixed detector, the photon that penetrates the scattered beam behind the sample forms scattered beam and is detected device and receives through the anti-scatter slit with after receiving slit collimator, detector carries out energy resolution with the transfer of data that receives to MCA, MCA transfers data to the scatter pattern that computer system is carried out date processing and obtained the object of surveying, record the scatter pattern under the detector different angles, set up the H-anim data base;

4) sample in the step 1) adopts detected human body, open x ray generator, the calibration light path, penetrate sample behind the X ray incident beam process divergent slit collimator that x ray generator produces, adjust the also angle of fixed detector, the photon that penetrates the scattered beam behind the sample forms scattered beam and is detected device and receives through the anti-scatter slit with after receiving slit collimator, detector carries out energy resolution with the transfer of data that receives to MCA, MCA transfers data to the scatter pattern that computer system is carried out date processing and obtained the object of surveying, get the step 2 under the identical scattering angle) in the scatter pattern of the object of surveying make the coherent function collection of illustrative plates, the signal characteristic of analysis of high frequency section, if Coherence Function Analysis has a peak value at high band, so just can conclude that detected human body contains heroin, otherwise just not have.

2. method of the heroin of hidden in human body being carried out fast automatic Non-Destructive Testing according to claim 1, it is characterized in that: for accurately, the scatter pattern of the object of surveying under the identical scattering angle in the object of surveying in the step 4) is done Coherence Function Analysis, the signal characteristic of analysis of high frequency section, if Coherence Function Analysis has a peak value at high band, so just can conclude in the detected human body does not have heroin.

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