Device for getting imprints of dust traces

FIELD: measurement technology; criminology.

SUBSTANCE: main and ancillary electrodes are installed before procedure of getting imprints of dust trace. Voltage applied to main and ancillary electrodes is regulated within wide high-voltage range. Device for getting imprints of dust traces has electric charge storage, main and ancillary electrodes and connecting cable of ancillary electrode, mechanical unit driven into action by muscle force of expert. Mechanical unit is connected with mechanical energy/electric energy converter which is connected with electric charge storage. Main electrode is coated with insulating dielectric film and connected with electric charge storage.

EFFECT: improved exploitation characteristics; independence on external electric power sources; reduced chance of electric current shock.

2 cl, 2 dwg

 

The technical solution relates to measuring technique and can be used in forensics to detect dust footsteps on the carpet, cloth and tissues.

This device is Dust Mark Lifting Kit (DLK) E 701000 [brochure forensic unit Dust Mark Lifting Kit (DLK) E 701000] to remove fingerprints, dust marks from carpets and various tissues, which contains a source of electrical energy (battery or accumulator), the inverter low voltage in high-voltage DC power, two electrodes, a dielectric film coated on one side with a layer of aluminum, and connecting cables. The basis of this instrument is based on the principle of transfer dust trail from the carpet due to the constant electrostatic field on special film (usually black). Special film rests on the shooting mark. Over the film fits the electrode. The second electrode podsalivaetsya under the carpet under the seat of the trail. Then the electrodes receive the high DC voltage from the device DLK E 701000. When working with the specified device must ensure that the voltage of the electric power source (battery or accumulator) corresponded to the nominal value. In addition, the complicated procedure of preparing the device for use.

The closest in technical the coy nature of the proposed technical solution is the forensic device "Trace" to remove fingerprints, dust traces [Forensic device "Trace" for removing dust prints. The user guide. Scientific and technical firm IZOVAC 2002], consisting of the power source Converter high voltage, the drive of the electric charge, high voltage switch, the main and auxiliary electrodes connected to the outputs of high voltage switch using a high-voltage cables, and special film for registration of dust prints. The device operates as follows. The device is connected to a source of electrical energy (electric network or batteries), the output of the inverter turns DC voltage of a few kilovolts. This voltage is applied to the drive of the electric charge. To remove prints, you must first auxiliary electrode placed under the carpet in the place where the footprint, cover with a special film trail and to impose on it the main electrode. Both electrodes using the cable to connect to the device. After this, including the high-voltage switch to apply a high voltage to the electrodes and to stand in this position for some time recommended by the instruction manual of the device. Then turn off the high voltage switch and thereby removed from the plates by high voltage. Lifted the main electrode and seized the camping special film with a detached dust behind them. Next check track with film possible either by photography or removal using gelatin film [Criminology, edited Yablokova N.P., Moscow, 1995].

The disadvantages of the known device is the necessity of using an external source of electrical energy, lower operating characteristics of the device associated with great preparatory time of installation of the main and auxiliary electrodes before removal procedure prints a trace, no adjustments of the magnitude of the high voltage DC voltage applied to the main and auxiliary electrodes, with the possibility of defeat expert high voltage voltage applied to the bare surface of the main and auxiliary electrodes.

Solved technical problem - increasing the operational characteristics of the device by reducing the preparation time of installation of the main and auxiliary electrodes before removing the fingerprint dust traces, the possibility of regulation in a wide range of high-voltage DC voltage applied to the main and auxiliary electrodes, there is no danger of defeat high-voltage and eliminating dependence on external sources of electrical energy.

The decision of the technical tasks in the first embodiment of the technical solution is achieved by in the transfer device fingerprint dust traces, consisting of the drive of the electric charge of the main and auxiliary electrodes and the connecting cable auxiliary electrode, introduced mechanical unit, driven by the muscular effort of the expert connected with a Converter of mechanical energy into electrical energy, which is connected with the drive of the electric charge, the main electrode is covered with an insulating dielectric film and is structurally related to the storage of electric charge.

The solution of the technical problem in the second embodiment, the technical solution is achieved in that in a device for removing fingerprints, dust traces, consisting of the drive of the electric charge of the main and auxiliary electrodes and the connecting cable auxiliary electrode, introduced mechanical unit, driven by the muscular effort of the expert connected with a Converter of mechanical energy into electrical energy, which is connected with the drive of the electric charge, the main electrode is covered with an insulating dielectric film and is structurally related to the storage of electric charge. When this mechanical device, a Converter of mechanical energy into electrical energy and the drive of the electric charge structurally integrated into one unit as with the me arm, made with the possibility of connection to the main electrode by using a join node.

Figure 1 presents a diagram of the device removing fingerprints, dust traces in the first embodiment of the technical solution. Device for removing fingerprints, dust traces contains mechanical unit 1, connected to a Converter of mechanical energy into electrical energy 2, which is connected with the drive of the electric charge 3. One of the outputs of the drive electric charge 3 directly connected to the main electrode 4 and the second - through cable 5 auxiliary electrode 6. The main electrode 4 is covered with an insulating dielectric film 7 and is structurally related to the storage of electric charge 3.

Figure 2 presents a diagram of the device removing fingerprints, dust tracks on the second version of the technical solution. Device for removing fingerprints, dust traces contains mechanical unit 1, connected to a Converter of mechanical energy into electrical energy 2, which is connected with the drive of the electric charge 3. One of the outputs of the drive electric charge 3 connected to the main electrode 4 and the second - through cable 5 auxiliary electrode 6. The main electrode 4 is covered with an insulating dielectric film 7. Mechanical site 1, the Converter of mechanical energy into electrical energy 2 the drive of the electric charge 3 structurally integrated into one unit in the form of a removable crank handle - made in one body in the form of a removable handle made with the possibility of joining due to the join node 8 with the main electrode 4. The Converter of mechanical energy into electrical energy in both versions of the technical solution may be performed by any known scheme, for example on the basis of the piezoelectric transducer with mechanical site that provides pressure to the piezoelectric crystal or oscillator voltage with mechanical site providing rotation of the armature of the generator.

Consider the work of the proposed device according to the first and second options. The auxiliary electrode 6 down under the carpet the product in place of the detection of fingerprint dust trail. The auxiliary electrode 6 via the cable 5 is connected to the drive of the electric charge 3. Constructive node, which consists of mechanical site 1, the Converter of mechanical energy into electrical energy 2 and the drive of the electric charge 3 (on the second version of the technical solution), attached to the main electrode 4, which is an example of a specific implementation for the first variant of the technical solution. The main electrode 4 is put on the top of the fingerprint dust trail. After this, the examiner operates the mechanical node 1, which affects Preobrazovatel the mechanical energy into electrical energy 2, and generating electrical energy, which is supplied to the drive of the electric charge 3 and then to 4 main and auxiliary electrodes 6. The magnitude of the electric charge on the electrodes depends on the force and duration of the actuation of the mechanical node 1. Thus, being adjusted in a wide range of high-voltage DC voltage applied to the primary 4 and 6 auxiliary electrodes. Next, the main electrode 4 is removed from the carpet and its dielectric surface remains fingerprint dust trail. Check fingerprint dust trail is provided either through photography or imprint dust trail using gelatin film [Criminology, edited Yablokova N.P., Moscow, 1995].

1. Device for removing fingerprints, dust traces, consisting of the drive of the electric charge of the main and auxiliary electrodes and the connecting cable auxiliary electrode, characterized in that the introduced mechanical unit, driven by the muscular effort of the expert connected with a Converter of mechanical energy into electrical energy, which is connected with the drive of the electric charge, the main electrode is covered with an insulating dielectric film and is structurally related to the storage of electric charge.



 

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