RU154331U1 - DEVICE FOR AUTOMATIC NON-CONTACT DETECTION OF PROTECTIVE METHODS BASED ON DIAMOND MICROCRYSTALS WITH ACTIVE NV CENTERS WITH DIFFERENT PROTECTIVE SIGNS - Google Patents

Abstract

A device for automatic non-contact detection of protective labels based on diamond microcrystals with active NV centers with different protective features, configured to determine the shape of double radio-optical resonance and containing a modulation signal generator connected to a microwave signal generator and a laser radiation source, the outputs of which are connected to the system microwave power supply to the tag and with the focusing system, respectively, located near the product with a protective tag connected to the photodet torus, whose output is connected to one input of the signal analysis unit, the other input of which is connected to the output reference signal storage unit.

Description

FIELD OF TECHNOLOGY

The utility model relates to the field of protection against counterfeiting banknotes, securities, documents and other products. More specifically, to devices for the automatic non-contact detection of security labels based on diamond microcrystals with active NV centers with different security features.

BACKGROUND

The closest analogues are the development of the same team of authors (patents RU 2411133 C1 - “Substance of the authenticity label of banknotes, securities and documents and a method for its preparation”, RU 2357866 C1 - “Method for protecting documents, securities or products using nanodiamonds with active NV centers ”and RU 2422903“ Device for verifying the authenticity of banknotes, securities and documents ”). The main disadvantage of this development is the impossibility of changing the characteristics of the active substance labels. As a protective feature, the quantum effect of Double Radio Optical Resonance (DROR) is used, which of all solids is inherent only in negatively charged nitrogen-vacancy centers (hereinafter NV centers) in diamond. Although this effect has been known in science for a long time, as a protective feature it was first applied only in the above development. However, in this development, only the presence or absence in the protective mark (on the surface of the protected product) of the DRR effect at one specific radio frequency (2.87 GHz) is monitored. Labels created according to the specified design are identical on all protected products, i.e. have the same immutable security feature. This significantly limits the scope of the technology, because it is often necessary to label different types of products with different labels, different batches, for example, produced in different periods, etc. Also, various manufacturers seek to protect their products with tags that differ from those used by other manufacturers. In addition, it is enough for attackers to uncover the specified method once and to make a large number of counterfeit active substances of protective labels so that they can then be applied to any counterfeit products that cannot be distinguished from the original. Thus, the main disadvantage of the known technology is the impossibility of varying the security feature.

The device for detecting security labels known by the mentioned patents does not allow distinguishing labels with NV centers, the security feature of which is modified in one way or another, which limits their scope.

DISCLOSURE OF A USEFUL MODEL

The problem of solving the utility model is to create a new device for automatic non-contact detection of protective labels, which allows the detection of these labels with the ability to distinguish between labels with different security features.

The technical result achieved by using the utility model is to expand the scope.

To solve the problem and achieve the claimed technical result, a new device for automatic non-contact detection of protective labels based on diamond microcrystals with active NV centers with different protective features is proposed. It is made with the possibility of determining the shape of double radio-optical resonance and containing a modulation signal generator connected to a microwave signal generator , and a laser source, the outputs of which are connected to the system for supplying microwave power to the tag and from the systems second focus respectively, placed near the article with a security mark, is connected to a photodetector, whose output is connected to one input of the signal analysis unit, the other input of which is connected to the output reference signal storage unit.

The device used to detect the above marks differs from the known ones in that it not only controls the presence or absence of DROR at one specific frequency, but also its spectrum. Thus, the above labels with different spectra of DROR are differently identified by this device, which can significantly expand the scope of the proposed device.

The specified solution is applied for the first time and eliminates the main disadvantage of the known analogues.

BRIEF DESCRIPTION OF THE DRAWINGS

In FIG. 1 is a schematic structural diagram of a device for detecting tags with different security features.

IMPLEMENTATION OF A USEFUL MODEL

A device for detecting tags with different security features (Fig. 1) includes, in addition to the protected product (4), with a security tag (5) the following components: laser (6), focusing system (7), consisting of a dichroic mirror, reflecting laser radiation and the lens focusing it, a microwave generator (8) that generates a frequency-modulated microwave signal (9), a system for supplying microwave power to the mark (10), consisting of a supply cable, a microwave insulator, and a near-field microwave antenna, a system radiation collection (11), consisting of a filter that cuts off the scattered laser radiation and transmits radiation from emitting the active substance of the tag, and a lens focusing the radiation on the photodetector (12), which generates an analog electric signal (13), a signal analysis unit (14), a reference signal generator (15), which generates a reference signal modulation (16), the storage unit of reference signals (17), issuing to the analysis unit (14) reference signals (18), as well as the output channel (output) of the device (19).

The operation of the device for detecting tags, the circuit of which is shown in FIG. 1 includes the following procedures:

1. The protected product (4) is automatically or manually fed into the control zone so that the place where the protective mark (5) should be located is in the zone of constant laser radiation (6) focused by the focusing system (7), where optical excitation occurs active substance labels. The focusing system contains a dichroic mirror reflecting laser radiation and transmitting fluorescence radiation of the active substance of the label. The laser radiation wavelength is chosen so that it falls into the absorption band of the NV centers, i.e. from 450 to 650 nm, and its power is P so that the fluorescence of the active substance of the label has a value sufficient for measurement, i.e. P = 10 mW to 5 watts.

2. At the same time, the active substance of the label is excited by frequency-modulated radiation (9) of the microwave generator (8), connected to the indicated area by the microwave signal supply system (10), consisting of a supply cable, a microwave insulator that prevents the microwave signal from being reflected back to the generator, and emitting a near-field microwave antenna, for example, a solenoid, a two-wire, microstrip, or other open line. The frequency of microwave radiation varies in time (scans, sweeps) from 2.7 to 3 GHz, and its power is from 0.1 W to 10 W.

3. Optical emission of the active substance of the tag passes through a dichroic mirror as part of the focusing system (7), is collected by the radiation collection system (11), which includes a filter that blocks the scattered laser radiation and transmits emission of emission of the active substance of the tag, and a lens focusing the radiation on photodetector (12), an analog electrical signal (13) from which is sent to the signal analysis unit (14).

4. Modulation of the microwave radiation of the generator (8) is performed in accordance with the reference modulation signal (16) generated by the reference signal generator (15). Also, the reference signal (16) is supplied to the analysis unit (14), where, based on the known (for the used microwave generator (8)) dependence of the frequency of the microwave signal on the amplitude of the reference modulation signal (16), the dependence of the amplitude of the photodetector on the frequency of the exciting microwave field is constructed , i.e. spectrum of DROR tags (hereinafter referred to as the measured signal).

5. In the analysis unit (14), the measured signal is compared with the reference signals (18) stored in the storage unit of the reference signals (17). The comparison procedure includes the calculation of the ratio of the measured and reference signals at certain frequencies (usually corresponding to the peaks and dips of the spectrum). If for the reference signal stored in the storage unit (17) under the number N and the measured signal, these relations differ from each other by less than some predetermined small value of δ (i.e., the signals are similar with a given accuracy of δ), the output N (19) of the device displays the number N of the standard with which a match is found. In the event that no matches are found with any reference, a signal corresponding to a false label is output, or no signal is output, depending on the implementation of the device. If a match is detected with more than one reference, an error signal is output. The storage unit for reference signals (17) is a digital device and contains non-volatile memory of the required size. The analysis unit (14) can be either a digital or an analog device, and depending on this, contain DAC and / or ADC devices. The output channel of the device (19) can be implemented in accordance with any digital data exchange protocol, or be analog.

Below, to illustrate certain aspects of the implementation of the utility model, examples of the operation of the proposed device for contactless automatic detection of tags with different security features are given. The following examples are not intended to limit the scope of this utility model in any way.

Example 1. Detection of a protective label containing diamond microcrystals with active NV centers doped with isotopes.

When detecting these labels using the proposed device carry out the following actions:

1. The protected product is placed in the control zone so that the place where the protective mark should be located is in the zone of exposure to laser radiation.

2. The mark is excited by constant optical laser radiation with a wavelength of 532 nm, a power of 300 mW, focused on the surface of the mark into a spot with a diameter of 300 μm.

3. At the same time, a microwave field is excited from a 3 W source, which is supplied using a short-circuited half-wave segment of a two-wire line placed at a distance of 1 mm from the mark. The frequency of the indicated microwave field changes (scans, sweeps) from 2.7 to 3 GHz in one second in accordance with the signal from the reference generator, which generates a sawtooth voltage with a period of 1 second.

4. The fluorescence of the label is controlled using a PMT equipped with an optical filter that blocks radiation with wavelengths less than 600 nm. Thus, the spectrum of the DROR tags is recorded.

5. The analogue electric signal of the PMT and the reference modulation signal are supplied to the signal analysis unit, which consists of a 2-channel ADC, a processor, a digital input and output. In the analysis unit, the signals are digitized and processed, at which each frequency of the reference signal is associated with a microwave frequency - voltage 0 V 2.7 GHz, maximum voltage - 3 GHz, and all intermediate voltage values - frequency values calculated by known characteristic microwave generator. The resulting dependence of the fluorescence amplitude on the frequency of the microwave field is the spectrum of the DROR tags (measured signal).

6. To reduce the likelihood of an error of action according to claims 2-5 repeat a number of times specified by the user (typically 3-10 times). The resulting signals are accumulated and averaged.

7. The resulting averaged measured signal is compared in turn with each of the reference signals stored digitally in the storage unit of the reference signals, which is a non-volatile memory. The comparison procedure includes the calculation of the ratio of the measured and reference signals at certain frequencies corresponding to the minima of the DROR spectra for different isotopes - 2,806, 2,868, 2,87, 2,872 and 2,933 GHz.

8. In the case where for the reference signal stored in the storage unit under number N and the averaged measured signal, all these relations differ from each other by less than 10% (ie, the spectra are similar with an accuracy of 10%), digital the output of the device displays the number N of the standard with which a match is found. If no matches are found with any standard, the value “zero” corresponding to the false label is displayed. If matches are found with more than one standard, an error code is displayed.

9. According to the data from the output of the analysis unit, they judge the authenticity of the label, the type to which it belongs, or the need for re-detection.

Example 2. Detection of a protective label containing diamond microcrystals with active NV centers having properties modified by radiation exposure.

When detecting these labels carry out the following actions.

1. The protected product is placed in the control zone so that the place where the protective mark should be located is in the zone of exposure to laser radiation.

2. The mark is excited by constant optical laser radiation with a wavelength of 532 nm, a power of 300 mW, focused on the surface of the mark into a spot with a diameter of 300 μm.

3. At the same time, a microwave field is excited from a 3 W source, which is supplied using a short-circuited half-wave segment of a two-wire line placed at a distance of 1 mm from the mark. The frequency of the indicated microwave field changes (scans, sweeps) from 2850 to 2890 MHz in one second in accordance with the signal from the reference generator, which generates a sawtooth voltage with a period of 1 second.

4. The fluorescence of the label is controlled using a PMT equipped with an optical filter that blocks radiation with wavelengths less than 600 nm. Thus, the spectrum of the DROR tags is recorded.

5. The analogue electric signal of the PMT and the reference modulation signal are supplied to the signal analysis unit, which consists of a 2-channel ADC, a processor, a digital input and output. In the analysis block, the signals are digitized and processed, at which each frequency of the reference signal is associated with a microwave frequency - voltage 0 V 2850 MHz, maximum voltage - 2890 MHz, and all intermediate voltage values - frequency values calculated using a known characteristic microwave generator. The resulting dependence of the fluorescence amplitude on the frequency of the microwave field is the spectrum of the DROR tags (measured signal).

6. To reduce the likelihood of an error, the actions in paragraphs 2-5 above are repeated a number of times specified by the user (typically 3-10 times). The resulting signals are accumulated and averaged.

7. The resulting averaged measured signal is compared in turn with each of the reference signals stored digitally in the storage unit of the reference signals, which is a non-volatile memory. The comparison procedure includes the calculation of the correlation coefficients of the measured signal and the reference signals.

8. The number N of the reference signal, the value of the correlation coefficient with which is more than 0.5 and at the same time exceeds all others by 10% or more (that is, the spectra are similar to within 10%), the number N of the standard is output to the digital output of the device . If all correlation coefficients turned out to be less than 0.5 (that is, no matches were found with any standard), the value “zero” corresponding to the false label is displayed. If matches are found with more than one standard, an error code is displayed.

According to the data from the output of the analysis unit, the authenticity of the label, the type to which it belongs, or the need for repeated detection are judged.

Example 3. Detection of a protective label containing diamond microcrystals with active NV centers possessing properties modified by mechanical action.

When detecting these labels carry out the following actions.

1. The protected product is placed in the control zone so that the place where the protective mark should be located is in the zone of exposure to laser radiation.

2. The mark is excited by constant optical laser radiation with a wavelength of 532 nm, a power of 300 mW, focused on the surface of the mark into a spot with a diameter of 300 μm.

3. At the same time, a microwave field is excited from a 3 W source, which is supplied using a short-circuited half-wave segment of a two-wire line placed at a distance of 1 mm from the mark. The frequency of the indicated microwave field changes (scans, sweeps) from 2820 to 2920 MHz in one second in accordance with the signal from the reference generator, which generates a sawtooth voltage with a period of 1 second.

4. The fluorescence of the label is controlled using a PMT equipped with an optical filter that blocks radiation with wavelengths less than 600 nm. Thus, the spectrum of the DROR tags is recorded.

5. The analogue electric signal of the PMT and the reference modulation signal are supplied to the signal analysis unit, which consists of a 2-channel ADC, a processor, a digital input and output. In the analysis unit, the signals are digitized and processed, at which each frequency of the reference signal is associated with a frequency of the microwave field - voltage 0 V 2820 MHz, maximum voltage - 2920 MHz, and all intermediate voltage values - frequency values calculated using a known characteristic microwave generator. The resulting dependence of the fluorescence amplitude on the frequency of the microwave field is the spectrum of the DROR tags (measured signal).

6. To reduce the likelihood of an error of action according to claims 2-5 repeat a number of times specified by the user (typically 3-10 times). The resulting signals are accumulated and averaged.

7. The resulting averaged measured signal is compared in turn with each of the reference signals stored digitally in the storage unit of the reference signals, which is a non-volatile memory. The comparison procedure includes the calculation of the correlation coefficients of the measured signal and the reference signals.

8. The number N of the reference signal, the value of the correlation coefficient with which is more than 0.5 and at the same time exceeds all others by 10% or more (that is, the spectra are similar to within 10%), the number N of the standard is output to the digital output of the device . In case all correlation coefficients turned out to be less than 0.5 (that is, no matches were found with any reference), the value “zero” corresponding to the false label is displayed. If matches are found with more than one standard, an error code is displayed.

9. According to the data from the output of the analysis unit, they judge the authenticity of the label, the type to which it belongs, or the need for re-detection.

From the above examples it is seen that the created device allows the detection of the above tags with the ability to distinguish between tags having different security features, which can significantly expand the scope of the proposed device.

Although the present utility model has been described in detail with examples of options that appear to be preferred, it must be remembered 5 that these examples of the implementation of the utility model are provided only for illustrative purposes. This description should not be construed as limiting the scope of the utility model, since the steps of the described methods and devices by specialists in the fields of physics, optics, electronics, signal processing, etc. can be amended to adapt them to specific devices or situations, and not beyond the scope of the attached utility model formula. The person skilled in the art understands that within the scope of the utility model, which is determined by the claims of the utility model, various options and modifications are possible, including equivalent solutions.

Claims (1)

A device for automatic non-contact detection of protective labels based on diamond microcrystals with active NV centers with different protective features, configured to determine the shape of double radio-optical resonance and containing a modulation signal generator connected to a microwave signal generator and a laser radiation source, the outputs of which are connected to the system microwave power supply to the tag and with the focusing system, respectively, located near the product with a protective tag connected to the photodet torus, whose output is connected to one input of the signal analysis unit, the other input of which is connected to the output reference signal storage unit.

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