RU2381480C1 - Explosive source - Google Patents

Abstract

FIELD: measuring technology.

SUBSTANCE: invention refers to gas analysis and covers testing of explosive vapour detectors. An explosive source contains a container with its internal coated with explosive traces, with a metal wire net in the bottom and a removable cover. The container comprises a quadric cylinder with internal diametre and length of a generating internal surface 0.4…0.7 and 0.3…0.4 respectively of the diametre of the sampler reflector of the explosive vapour detector. The net is made of wire of the diametre 0.007…0.015 and the back mesh size 0.02…0.03 of the internal diametre of the container.

EFFECT: substantially improved effectiveness of the explosive source of with simultaneous minimisation of weight and dimensions.

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Description

The invention relates to the field of gas analysis and is intended for testing (performance testing) detectors of explosive vapor (BB).

Known explosive vapor detectors containing an enlarged air sampling unit, an analysis unit for a sampled air sample, and an analysis results display unit [1]. For sampling, some of them use various kinds of systems for remote sampling of air samples (sampling devices) from the surface and from unsealed objects based on intensive air blowing of the object under examination, for example [2]. A set of explosive vapor detectors usually includes a source of explosive vapor, for example, in the form of a container, on the inner surface of which is coated with a micro quantity of explosives, with a metal wire mesh and a removable lid placed mainly in its bottom part [3].

The disadvantages of this source of explosive vapor are either significant weight and size parameters that limit its use in conjunction with the explosive vapor detector for on-line inspection of the terrain and individual objects, or low efficiency due to the mismatch between the parameters of the sampling device of the explosive vapor detector and the explosive vapor source.

The objective of the present invention is to significantly increase the efficiency of the source of explosive vapor while minimizing its weight and size parameters.

The problem is solved in that in the source of vapor of the explosive containing a container on the inner surface of which is coated with a micro quantity of explosives with a wire mesh of metal in the bottom and a removable lid, the container is made in the form of a cylinder of revolution with an inner diameter and a length forming an inner surface respectively 0.4 ... 0.7 and 0.3 ... 0.4 of the diameter of the reflector of the sampling device of the explosive vapor detector, and the grid is made of wire with a diameter of 0.007 ... 0.015 and a mesh size of 0.02 ... 0.03 of the inner diameter of nteynera.

The analysis of the claimed device showed that a significant increase in the efficiency of the source of explosive vapor while minimizing its weight and size parameters is ensured by the container in the form of a cylinder of revolution with an inner diameter and a length of the generatrix of the inner surface, respectively 0.4 ... 0.7 and 0.3 ... 0.4 of the diameter of the reflector of the sampling device of the vapor detector EXPLOSIVES and performing a mesh of wire with a diameter of 0.007 ... 0.015 and a mesh size at a clearance of 0.02 ... 0.03 of the inner diameter of the container. Such internal dimensions of the container and the location of the mesh provide an efficient swirl flow created by the sampling device of the explosive vapor detector, the entire inner surface of the container with the corresponding provision for sampling with explosive vapor. The diameter of the reflector determines the diameter of the vortex flow. Hard-to-reach mesh surfaces with the given parameters and the bottom (bottom) inner surface of the container provide a long service life of the source of explosive vapor without reducing the efficiency of sampling using the vortex flow created by the sampling device. With a decrease in the internal dimensions of the container, part of the vortex flow begins to blow around the external surface of the container, on which there is no explosive, until the possibility of taking samples from the explosive from the internal volume is completely eliminated. Reducing the length of the generatrix of the inner surface of the container reduces the area of the working surface on which the explosive is applied. The increase in the internal dimensions of the container above the above does not lead to a noticeable increase in the efficiency of sampling with explosive vapor using a sampling device, while limiting the very possibility of its use in conjunction with an explosive vapor detector during an operational survey of the terrain and individual objects. The above parameters of the source of explosive vapor are optimal, which is confirmed by numerous experimental studies and experience in operating explosive vapor detectors in real conditions.

Figure 1 shows a diagram of the inventive source of explosive vapor, where D _r is the diameter of the reflector of the sampling device of the explosive vapor detector, figure 2 is a grid in plan.

The source of explosive vapor contains a container 1 with a removable lid 2 and a net 3. In absolute values, the diameter of the reflector of the sampling device is 50 ... 60 mm, the inner diameter of the container is 28 ... 32 mm; the length of the generatrix of the inner surface of 15 ... 20 mm; the diameter of the wire in the grid is 0.25 ... 0.35 mm; cell size at a clearance of 0.7 ... 0.8 mm.

Thus, the proposed technical solution provides a significant increase in the efficiency of the source of explosive vapor while minimizing its weight and size parameters.

Information sources

1. Portable explosive vapor detector MO-2M. User's manual. - CJSC Sibel, 1999.

2. RF patent No. 2279051, IPC G01N 1/22, 2004.

3. RF application for utility model No. 2008117306, IPC G01N 1/02, 2008.

Claims (1)

A source of explosive vapors containing a container, the inner surface of which is coated with a micro quantity of explosive, with a wire mesh of metal in the bottom and a removable lid, characterized in that the container is made in the form of a cylinder of revolution with an inner diameter and a length forming an inner surface, respectively 0.4 ... 0.7 and 0.3 ... 0.4 of the diameter of the reflector of the sampling device of the explosive vapor detector, and the grid is made of wire with a diameter of 0.007 ... 0.015 and a mesh size of Vet 0.02 ... 0.03 of the inner diameter of the container.

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