JPS63103887A - Laser beam-initiating explosive composition - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention achieves a wavelength of 0.6 The present invention relates to an explosive composition that is detonated by a laser beam of ~10 μm and a pulse width of 0.1 to 10 ms.

(Prior Art) High-power laser oscillation devices include solid lasers such as ruby lasers and YAG (yttrium aluminum garnet) lasers, and gas lasers such as carbon dioxide lasers. Laser oscillation methods include continuous oscillation and pulse oscillation.

Among them, the pulse oscillation method has a pulse width of 0.1 to 10
There is a pulse oscillation method using a Q switch that generates a normal pulse oscillation of about ms and a huge pulse in a short time with a pulse width of about 1 to 10 ns. Figure 1 shows the output characteristics of laser light in normal pulse oscillation and Q-switch oscillation methods. The former has a pulse width on the order of ms and has a large output, whereas the latter has a pulse width on the order of ns and has a large power.

Conventionally, using the above laser beam, pen slit (hereinafter referred to as PETN), tetryl, hexogen (hereinafter referred to as R),
DX) is used, and it has a two-tiered chamber structure, upper and lower. The lower chamber consists of a metal plate placed in contact with the surface opposite to the side that is irradiated, and after the upper explosive receives the laser beam and deflagrates, the gas pressure causes the metal plate to open in the lower chamber. The gun has a specific gravity adjusted to detonate when hit by an explosive, and there is a gap between the upper chamber and the lower chamber to allow the metal plate to fly. In this case, US Pat. No. 3,528,372 discloses that the laser light to be used is not particularly limited as long as it has sufficient power or output to deflagrate the upper stage explosive. Other examples include PETN, tetryl, RD
One of the explosives consisting of US Pat. No. 3,812,783 discloses a method in which a metal plate is irradiated with a metal plate to instantaneously vaporize it, and a shock wave is generated to detonate an explosive in contact with the metal plate. Another example is disclosed in US Pat. No. 4,391,195, in which triginate, which is a detonator, is detonated by irradiating it with ordinary pulsed laser light.

(Problem to be solved by the invention) In this way, PETN and tetryl are produced using laser light.

There are methods to detonate secondary explosives such as RDX, but all of them involve direct irradiation of a laser beam onto the explosive to prevent the irradiated explosive from detonating (using some auxiliary means). The detonator is detonated by the detonator, making it structurally complex.In addition, the detonator, such as toriginate, can be detonated by direct irradiation with normal pulsed laser light of several tens to several hundred mJ. However, the use of explosives requires careful handling as they are highly sensitive to heat and shock.

Therefore, the inventors of the present invention have conducted intensive research over a long period of time while taking into consideration the above-mentioned problems, and as a result, the present inventors have found that additives can be used for secondary explosives such as PETN, which conventionally could not be detonated without using some kind of auxiliary means. It was discovered that by mixing an appropriate amount of carbon black, etc. and adjusting its specific gravity, it could easily absorb the infrared heat energy of the laser and heat the explosive. It has been found that it is possible to detonate using a normal pulsed oscillation type laser beam, without using a Q-switched oscillation type pulsed laser beam, which is good for use, but the adjustment of the output device is delicate, and the present invention has been developed. completed.

(Means for solving the problem) That is, the explosive composition detonated by the laser beam of the present invention has a wavelength of 0.6 to 11 μm and a pulse width of 0.1 to 10 m.
When the explosive is detonated by the laser beam of s, one or more explosives selected from the group consisting of pen slit, tetryl, and hexogen, and one or two types selected from the group consisting of carbon black, graphite, and black dye. An explosive composition to which the above additives are added, the specific gravity of the explosive composition is 1.1 to 1.4, and the addition ratio of the additive is 0.5 to 1.4.
It is characterized by a content of 10% by weight.

To explain the explosive mechanism of explosives using laser light, Q
When an explosive is irradiated with a huge pulse of laser light from a switch, it will start detonating mainly in response to the impact when the laser light is irradiated, whereas when an explosive is irradiated with a normal pulse of laser light, It reacts to the thermal energy of the laser beam and starts detonating.

Therefore, the explosive composition of the present invention must be an explosive that can effectively absorb the thermal energy of the laser beam and can be detonated by the thermal energy. Specifically, a carbon blank or the like is used as a material that absorbs the thermal energy of the laser beam, and PETN or the like is used as the main explosive. The explosive composition must be such that the particles such as PETN are effectively heated and reacted to initiate detonation. For this purpose, it is necessary to create an explosive composition in which PETN or the like has a specific specific gravity and carbon blank or the like is added in a specific proportion.

Here, the specific gravity of the explosive used in this application will be described.

The lower the specific gravity of the explosive, the smaller the amount of the explosive and additive occupy per unit volume, so the amount of laser light irradiated per additive particle is large.

Therefore, the temperature when heated becomes high. Furthermore, since the amount of explosive particles in the vicinity of the additive heated by absorbing laser light is small, the explosive particles are easily heated. In other words, a true bond is formed, and detonation by laser beam irradiation can be easily achieved. However, in practical terms, the lower limit is a specific gravity of 1.1, considering the detonation speed when detonated and the ease of handling. Moreover, the upper limit is 1.4 as a result of an experiment, which is the opposite of the above-mentioned reason.

In addition, the purpose of adding the additive is the wavelength 0.6 to 1 of the claimed wavelength range.
The objective is to efficiently absorb infrared thermal energy of 1 μm laser light. The additives used for this purpose have a wavelength of 0.
Any material may be used as long as it efficiently absorbs light with a wavelength of 6 to 11 μm and is heated (in this application, carbon black and graphite are used).

A black dye was used.

The additive may be added in any proportion as long as it can efficiently absorb laser light.

However, since it is used by mixing it with explosives, if the amount of the additive, which is an inert substance, increases, the power of the explosive when it is detonated decreases. Therefore, it is usually added in an amount of 0.5 to 10% by weight.

The particle size of the explosive and the additive is not particularly limited, but the finer the particle size (usually about 50 mesoshpas or less), the larger the contact area between the explosive and the additive, and the better the heat conduction from the additive to the explosive.

These properties result in an explosive composition that can be detonated by ordinary pulsed laser light without the use of any auxiliary means.

(Effects of the Invention) The explosive composition of the present invention that can be detonated by laser light does not require the conventional structure of two chambers and a metal plate, or the structure of disposing a metal plate on the surface irradiated with laser light. friend,
It is an explosive composition that can detonate secondary explosives such as PETN, tetryl, RDX, etc. with a normal pulsed laser beam and with relatively small energy of several joules.

(Example) Next, the present invention will be specifically explained using examples.

Examples 1 to 20 The amount of carbon black added was 0.5, 1.0, 2.0,
The specific gravity of PENT mixed with the carbon blank was changed by 5.0° by 10.0% by weight to 1.10, 1.15, 1.
．． Explosive samples adjusted to 20 and 1.40 were prepared. In addition, the particle size of PETN is 60 to 80 mesobus 1
8% by weight, 80-100 mesospas 47% by weight, 10
0-150 mesh pass 21.1 址χ, 150-200
13% by weight of mesh pass, less than 200 mesh pass 1
About % by weight was used. Further, the particle size of carbon black used was about 30 μm.

A detonation experiment was conducted using the above explosive sample. The method for conducting this test is to use an explosive sample as shown in Figure 2, made of Cu material and with an inner diameter of 6.2 mm.
Tsuru was loaded into a detonator tube body with an outer diameter of 6.7 mm at a dose of 22 cm. In this case, with a specific gravity of 1.15, the drug amount is 0.74g
, when the specific gravity is 1.40, the drug amount is 0.8. As shown in Fig. 3, this sample was fixed with an optical fiber fixing plug made of material AI- so that the optical fiber was in contact with the drug surface.
The detonator tube body containing the explosive sample was fixed using the Reizen mounting plug. In order to guide the laser beam from the laser oscillator to the explosive surface, the core diameter of quartz material is 0.8 mm and the attenuation rate is 6 dB.
= 1 km multimode optical fiber was used. Also,
The laser beam is a YAG laser with a wavelength of 1.06 gm, a pulse width of 0.2 to 9 ms, and an energy of 0.1 to 40 gm.
．． I used one that could be varied within a range of 5J.

The results of the experiment are shown in Table 1. Examples 21 to 23 Examples 1 to 20 except that the explosives shown in Table 1 were used instead of PETH, and the additives shown in Table 1 were used instead of carbon black. The experiment was conducted in a similar manner.

The results are shown in Table 1.

Comparative Examples 1-4 Samples were prepared in the same manner as Examples 1-20 except that carbon black was not added. Experiments similar to those in Examples were conducted using these samples.

The results are shown in Table 1 Comparative Examples 5 to 7 Regarding explosive compositions shown in Table 1 that are outside the scope of the present invention, samples were prepared in the same manner as in the examples, and tests were conducted in the same manner as in the examples. .

The results are shown in Table 1.

Next, the test results of each comparative example and example will be explained in detail.

In Examples 1 to 20, as a general tendency, if the amount of carbon black added is the same, the lower the specific gravity, the lower the minimum detonation energy of the laser, and the specific gravity is 1.10.
and 1.15 were at the same level. Moreover, if the specific gravity was the same, the carbon blank added in an amount of about 1.2 to 2.0z could be detonated with small laser energy. In Examples 21 to 23 as well, the explosive samples were able to be completely detonated.

In the case of PETN alone in Comparative Examples 1 to 4, even if the laser irradiation energy was 40.5 J, which is the maximum value that can be generated by the oscillation device in this experiment, it was not possible to completely explode, and the specific gravity was 1°10,
1.15 was a half ring, and 1.20.1.40 was a small ring. This is because PETN alone is white and cannot absorb laser light and reflects most of it.
This is thought to be because the thermal energy of the laser beam is not effectively transmitted to the explosive. In Comparative Examples 5 and 6, although the specific gravity was in the detonable range, the amount of carbon black added was inappropriate;
It was a half ring with a laser energy of 40.5J. In Comparative Example 7, the amount of carbon black added was good, but the specific gravity was inappropriate, resulting in a small ring of 40.5 J.

As described above, the Examples and Comparative Examples demonstrate that the composition of the present invention can be detonated even by normal pulsed laser light having a pulse width on the order of milliseconds, and is an excellent composition that has never existed before. .

[Brief explanation of the drawing]

Figure 1 is a diagram showing the output characteristics of laser light in the normal pulse oscillation and Q-switch oscillation methods, Figure 2 is a diagram showing the explosive sample loaded in the capacity in the example, and Figure 3 is the diagram used in the example. FIG. 3 is a diagram illustrating a method for fixing a container loaded with an explosive sample and fixing an optical fiber.

Claims (1)

[Claims] 1. Wavelength 0.6-11μm, pulse width 0.1-10ms
When the explosive is detonated by the laser beam, the pen slit,
An explosive composition in which one or more kinds of explosives selected from the group consisting of tetryl and hexogen are added with one or more kinds of additives selected from the group consisting of carbon black, graphite, and black dye. The specific gravity of the explosive composition is 1.1 to 1.4, and the addition ratio of the additive is 0.5 to 1.
An explosive composition detonated by laser light, characterized in that the content is 0% by weight.