CN108646110B - Method for testing and evaluating safety margin of strong-field electromagnetic radiation of actual electric explosion device - Google Patents
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- 238000004880 explosion Methods 0.000 title claims abstract description 103
- 238000012360 testing method Methods 0.000 title claims abstract description 73
- 230000005670 electromagnetic radiation Effects 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005855 radiation Effects 0.000 claims abstract description 28
- 230000005284 excitation Effects 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000013213 extrapolation Methods 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 claims description 22
- 239000003814 drug Substances 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000005672 electromagnetic field Effects 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 4
- 239000002360 explosive Substances 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- QERYCTSHXKAMIS-UHFFFAOYSA-M thiophene-2-carboxylate Chemical compound [O-]C(=O)C1=CC=CS1 QERYCTSHXKAMIS-UHFFFAOYSA-M 0.000 claims 1
- 238000013459 approach Methods 0.000 abstract description 3
- 230000000977 initiatory effect Effects 0.000 abstract description 2
- 238000009529 body temperature measurement Methods 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 6
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- 238000005259 measurement Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000005474 detonation Methods 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000003721 gunpowder Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
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Abstract
The invention discloses a method for testing and evaluating safety margin of strong-field electromagnetic radiation of a practical electric explosion device, which comprises the following steps: the method comprises the following steps: under laboratory conditions, the ambient temperature is set to
Performing current injection or electromagnetic pulse injection effect test on the glowing bridge wire type electric explosion device, and determining 50% ignition excitation parameters and corresponding bare bridge wire ignition temperature rise value of the electric explosion device
(ii) a Step two: in the mounted state, the ambient temperature is
Developing low field intensity electromagnetic radiation pre-test to test the temperature rise value of exposed bridge wire of electric explosion device
(ii) a Step three: extrapolation to obtain the ignition field intensity of the electric explosion device in the actual working state
(ii) a Step four: calculating and determining the electromagnetic radiation safety margin of the electric explosion device in the real-mounted working state; the invention relates to a packaged electric applianceThe strong-field electromagnetic radiation safety margin testing and evaluating method of the explosion device provides an effective technical approach for testing the radiation safety of the solid-mounted ignition bridge wire type electric ignition and electric initiation weapon equipment in an extremely severe electromagnetic environment.
Description
Technical Field
The invention relates to a method for testing and evaluating safety margin of strong-field electromagnetic radiation of a practical electric explosion device, belonging to the technical field of military equipment.
Background
The electric explosion device is commonly used for igniting gunpowder and detonating explosives, can also be used as a small-sized driving device for quickly opening a valve, relieving safety, separating rockets and the like, and can be widely applied to military projects such as conventional weapons and ammunition, missiles, nuclear weapons, aerospace systems and the like; the energy source is the most sensitive initial energy source for initiation and ignition, the position and the action of the energy source in a weapon system are determined by the functional initiatives and the action sensitivity of the energy source, and the safety and the reliability of the energy source directly influence the safety and the reliability of the weapon system.
The electric explosion device is a component of weapon equipment such as ammunition, missile and the like, the electromagnetic coupling characteristics of the independent electric explosion device and the electric explosion device which is arranged in the projectile body and is in a real-mounted state have great difference, and if the ignition field intensity of the electric explosion device is only obtained, the safety of the whole equipment under the action of a strong electromagnetic radiation field is still difficult to effectively evaluate; however, the overall linearity of the equipment is often large (such as rocket projectiles and the like), it is very difficult to develop an overall electromagnetic radiation test which meets the electromagnetic environment level specified by the GJB1389A-2005, and if safety margin test evaluation of the equipment is carried out, the required electromagnetic environment is more difficult to simulate and even technically impossible to realize; therefore, how to overcome the influence of different factors on the bridge wire temperature measurement result is to provide a method for testing and evaluating the safety margin of the strong-field electromagnetic radiation of the glowing bridge wire type electric explosion device in a real-mounted state on the basis of the ignition performance of the electric explosion device under the action of electromagnetic field radiation and the bridge wire temperature rise measurement result, which is a key technical problem to be solved.
Disclosure of Invention
In order to solve the problems, the invention provides a strong-field electromagnetic radiation safety margin test and evaluation method for a practical electric explosion device, and provides an effective technical approach for testing the radiation safety of practical burning bridge wire type electric ignition and electric explosion weaponry in an extremely severe electromagnetic environment.
The invention discloses a method for testing and evaluating the safety margin of strong-field electromagnetic radiation of a practical electric explosion device, which comprises the following steps:
the method comprises the following steps: under laboratory conditions, the ambient temperature is set to
Performing current injection or electromagnetic pulse injection effect test on the glowing bridge wire type electric explosion device, and determining 50% ignition excitation parameters and corresponding bare bridge wire ignition temperature rise value of the electric explosion device
；
Step two: in the mounted state, the ambient temperature is
Developing low field intensity electromagnetic radiation pre-test to test the temperature rise value of exposed bridge wire of electric explosion device
；
Step three: in-situ assembling tool of electric explosion device obtained by extrapolationField intensity of fire in working condition
；
Step four: will be provided with
And comparing the field intensity with the given expected working environment, and calculating and determining the electromagnetic radiation safety margin of the electric explosion device in the actual working state.
Further, the specific operation steps of the first step are as follows: selecting a plurality of electric explosion devices for the tested devices, wherein each electric explosion device comprises a lead, a bridge wire arranged in the lead and a medicament wrapped around the bridge wire; in a laboratory environment with constant temperature
Carrying out a current injection or electromagnetic pulse injection effect test, and determining 50% ignition excitation parameters of the electric explosion device by a lifting method (see GJB/Z377A-94) and the aid of a statistical theory; removing the medicament around the bridge wire of the electric explosion device, placing the temperature sensor close to the bridge wire, performing injection test on the exposed bridge wire according to 50% ignition excitation parameters of the tested electric explosion device, and measuring the temperature of the bridge wire corresponding to 50% ignition excitation of the electric explosion deviceT 2(ii) a According to the proposed calibration and prediction model for the temperature rise of the bare bridge wire, different pulse or continuous wave signal characteristics and different environmental temperatures are obtained
50% of ignition excitation of lower electric explosion device corresponds to bridge wire temperature
So as to obtain the corresponding exposed bridge wire ignition temperature rise value of the electric explosion device corresponding to the corresponding 50 percent ignition excitation parameters in the electromagnetic environment and the environment temperature
。
Still further, the ignition excitation parameters include the amplitude of the injection current, the pulse width, the repetition frequency and the amplitude of the electromagnetic pulse, and the like.
Further, the specific operation steps of the second step are as follows: placing the tested ammunition or missile in an electromagnetic radiation field in a whole, wherein the environment temperature is
Developing a low-field intensity electromagnetic radiation pre-test; in order to ensure the safety of the experimental process, equipment such as ammunition or guided missile is modified, and explosive in a subsequent explosion transfer sequence and medicaments around a bridge wire of an electric explosion device are removed; the electromagnetic coupling characteristic of the equipment can not be changed in the refitting process, and the circuit structure, the lead length and the space position are not changed; placing a temperature measuring sensor close to the bridgewire, connecting the temperature measuring sensor with an optical fiber temperature measuring test configuration, transmitting bridgewire temperature measuring signals to an optical fiber temperature measuring system host through optical fibers, wherein an optical fiber data acquisition module is installed on the optical fiber temperature measuring system host, and the optical fiber temperature measuring system host is electrically connected to a control test system;
the construction of the electromagnetic radiation environment in the pre-test comprises two modes: one is to simulate the desired electromagnetic environment under laboratory conditions; the other method is that equipment such as a real radar or a high-power microwave weapon and the like is directly used for carrying out electromagnetic radiation on a tested object; reasonably selecting the intensity of the electromagnetic radiation field during the pre-test, and recording the intensity of the radiation field asE LThe accuracy of a bridge wire temperature rise test value is ensured; in a GHz frequency band, considering that the radiation range of a strong electromagnetic field which can be constructed is limited, aiming a transmitting antenna at a key part of a bomb body for irradiation, and finding the most sensitive state of the tested device; carrying out low-field electromagnetic radiation pre-test in the most sensitive state of the tested equipment to test the temperature of the exposed bridge wire of the electric explosion device
At low field strengthE LThe temperature rise value of the exposed bridge wire of the electric explosion device under the electromagnetic radiation is
。
Further, the specific operation steps of the third step are as follows: under the condition of heat insulation or heat balance, the relationship between the input current and the temperature rise of the bridge wire satisfiesI 2Is proportional to
(ii) a The external radiation field intensity and the bridge wire input current are in a linear relation; therefore, the temperature rise of the glowing bridge wire and the square value of the external radiation field intensity are in a direct proportion relationship; according to the property that the temperature rise of the glowing bridge wire is in direct proportion to the square value of the external radiation field intensity, the temperature rise obtained by the preliminary test is
Performing linear extrapolation; known temperature rise
Corresponding radiation field strength value ofE LIf the temperature of the bridge wire corresponding to 50 percent of the ignition field intensity of the tested electric explosion device rises to
And extrapolating to obtain 50% of ignition field intensity
Is composed of
Calculating the ignition field intensity of the electric explosion device in the actual installation working state according to the formula
。
Further, the specific operation steps of the fourth step are as follows: will be provided with
Given expected working environment field intensityE bIn comparison with the above-mentioned results,according to the definition of the safety margin in GJB 72A-2002 electromagnetic interference and electromagnetic compatibility terminology, the electromagnetic radiation safety margin of the electric explosion device in the actual installation working state is determined by the following formula,
safety margin =
The unit: dB.
Compared with the prior art, the strong-field electromagnetic radiation safety margin test and evaluation method of the actual-installed electric explosion device starts from the ignition mechanism of the glowing bridge-wire type electric explosion device, adopts the optical fiber temperature measurement method to test and evaluate the electromagnetic radiation safety of the electric explosion device, is tightly attached to the ignition mechanism, can accurately reflect the ignition characteristic, has almost no relation between bridge-wire temperature rise measurement and radiation frequency, can overcome the influence of the electromagnetic radiation frequency on the test result, can solve the electromagnetic safety test problem of the electric explosion device with the frequency above GHz, and effectively expands the upper limit of the applicable frequency; based on the high-field electromagnetic radiation effect equivalent test method of the electric explosion device, the electric explosion device which is arranged in the equipment and is in a real-mounted state is used as a tested object, the electromagnetic radiation sensitivity condition of the tested object is determined, a high-field electromagnetic radiation safety margin test evaluation method of the electric explosion device in the real-mounted state is provided, and an effective technical approach is provided for testing the radiation safety of the real-mounted burning bridge wire type electric ignition and electric detonation weapon equipment in an extremely severe electromagnetic environment.
Drawings
Fig. 1 is a schematic structural diagram of an electric explosion device of the invention.
Fig. 2 is a schematic diagram of the structure of the exposed bridge wire temperature rise measurement device of the electric explosion device.
FIG. 3 is a schematic diagram of the configuration of the fiber temperature measurement test of the present invention.
The parts in the drawings are marked as follows: the system comprises a lead 1, a bridge wire 2, a medicament 3, a temperature measuring sensor 4, an optical fiber temperature measuring system host 5, an optical fiber data acquisition module 6 and a control test system 7.
Detailed Description
The invention discloses a method for testing and evaluating the safety margin of strong-field electromagnetic radiation of a practical electric explosion device, which comprises the following steps:
the method comprises the following steps: under laboratory conditions, the ambient temperature is set to
Performing current injection or electromagnetic pulse injection effect test on the glowing bridge wire type electric explosion device, and determining 50% ignition excitation parameters and corresponding bare bridge wire ignition temperature rise value of the electric explosion device
；
Step two: in the mounted state, the ambient temperature is
Developing low field intensity electromagnetic radiation pre-test to test the temperature rise value of exposed bridge wire of electric explosion device
；
Step three: extrapolation to obtain the ignition field intensity of the electric explosion device in the actual working state
；
Step four: will be provided with
And comparing the field intensity with the given expected working environment, and calculating and determining the electromagnetic radiation safety margin of the electric explosion device in the actual working state.
The specific operation steps of the first step are as follows: selecting a plurality of electric explosion devices for tested devices, wherein the electric explosion devices comprise a lead wire 1, a bridge wire 2 arranged in the lead wire 1, and a medicament 3 wrapped around the bridge wire 2, and are arranged in a laboratory at a constant temperature environment
Performing current injection or electromagnetic pulse injection effect test byThe lifting method (see GJB/Z377A-94) determines 50% ignition excitation parameters of the electric explosion device by means of a statistical theory; as shown in figure 2, the medicament 3 around the bridge wire 2 of the electric explosion device is removed, the temperature measuring sensor 4 is arranged close to the bridge wire 2, the injection test is carried out on the exposed bridge wire according to the 50 percent ignition excitation parameter of the tested electric explosion device, and the temperature of the bridge wire corresponding to the 50 percent ignition excitation of the electric explosion device is measuredT 2(ii) a According to the proposed calibration and prediction model for the temperature rise of the bare bridge wire, different pulse or continuous wave signal characteristics and different environmental temperatures are obtained
50% of ignition excitation of lower electric explosion device corresponds to bridge wire temperature
So as to obtain the corresponding exposed bridge wire ignition temperature rise value of the electric explosion device corresponding to the corresponding 50 percent ignition excitation parameters in the electromagnetic environment and the environment temperature
。
The ignition excitation parameters comprise the amplitude of the injected current, the pulse width, the repetition frequency, the amplitude and the like of the electromagnetic pulse.
The second step comprises the following specific operation steps: placing the tested ammunition or missile in an electromagnetic radiation field in a whole, wherein the environment temperature is
Developing a low-field intensity electromagnetic radiation pre-test; in order to ensure the safety of the experimental process, equipment such as ammunition or guided missile is modified, and explosive in a subsequent explosion transfer sequence and medicaments around a bridge wire of an electric explosion device are removed; the electromagnetic coupling characteristic of the equipment can not be changed in the refitting process, and the circuit structure, the lead length and the space position are not changed; as shown in figure 3, the temperature sensor 4 is arranged close to the bridgewire 2, the temperature sensor 4 is connected with the optical fiber temperature measurement test configuration, the temperature measurement signal of the bridgewire 2 is transmitted to the optical fiber temperature measurement system host 5 through the optical fiber, and the optical fiber temperature measurement system host 5 is provided with the temperature measurement sensor 4The optical fiber data acquisition module 6 is electrically connected with the optical fiber temperature measurement system host 5 to the control test system 7;
the construction of the electromagnetic radiation environment in the pre-test comprises two modes: one is to simulate the desired electromagnetic environment under laboratory conditions; the other method is that equipment such as a real radar or a high-power microwave weapon and the like is directly used for carrying out electromagnetic radiation on a tested object; reasonably selecting the intensity of the electromagnetic radiation field during the pre-test, and recording the intensity of the radiation field asE LThe accuracy of a bridge wire temperature rise test value is ensured; in a GHz frequency band, considering that the radiation range of a strong electromagnetic field which can be constructed is limited, aiming a transmitting antenna at a key part of a bomb body for irradiation, and finding the most sensitive state of the tested device; carrying out low-field electromagnetic radiation pre-test in the most sensitive state of the tested equipment to test the temperature of the exposed bridge wire of the electric explosion device
At low field strengthE LThe temperature rise value of the exposed bridge wire of the electric explosion device under the electromagnetic radiation is
。
The bridge wire material of the common glowing bridge wire type electric explosion device is mainly nickel-chromium alloy 6J20 and 6J10, the resistance temperature coefficient is very small and is about 7 × 10-5℃-1While the ignition temperature of the general medicament is less than 1000 ℃, and the resistance value of the bridge wire is not changed along with the temperature rise within the experimental error range; due to different characteristics of external excitation signals, the temperature of the bridge wire can be increased under two conditions of heat insulation or heat balance;
under adiabatic conditions, the bridge wire generates heat of
Wherein I is the exciting current of the bridge wire, R is the resistance value of the bridge wire, t0The action time is; according to the law of conservation of energy, the part of heat is totally used for temperature rise of the bridgewire, so that the following results:
wherein c, m and
the specific heat, mass and temperature rise of the bridgewire are respectively; according to the formula, the square of the current is in direct proportion to the temperature rise of the bridge wire;
under the condition of thermal equilibrium, the heat generated by the bridgewire is used for temperature rise of the bridgewire, and a part of the heat is conducted to an external medium, and the heat dissipated by the bridgewire according to the Fourier law
Proportional to the temperature gradient dT/dr in the direction perpendicular to the cross section and to the cross-sectional area S, i.e.
Wherein k is the heat transfer coefficient of the medium, and under ideal conditions, the temperature of the bridge wire rises
(i.e. the temperature difference between the bridge wire and the environment) and dT/dr, thus obtaining
And
are also in direct proportion, i.e.
Wherein
As a scale factor, it can be seen from the expressions (1) and (3) that the DC intensity and the radiation are different for different environmental temperaturesThe frequency radiation field intensity, under the thermal equilibrium condition, the relationship between the input current and the temperature rise of the bridge wire both satisfy I2Is proportional to
；
In summary, under two conditions of thermal insulation or thermal balance, the relationship between the input excitation current on the bridge wire and the temperature rise of the bridge wire satisfies I2Is proportional to
(ii) a The conclusion provides a theoretical basis for a linear extrapolation idea adopted in the evaluation of the electromagnetic radiation safety margin of the glow bridge wire type electric explosion device in a real-installation state.
The third step comprises the following specific operation steps: according to the theory, under the condition of heat insulation or heat balance, the relation between the input current and the temperature rise of the bridge wire satisfiesI 2Is proportional to
(ii) a The external radiation field intensity and the bridge wire input current are in a linear relation; therefore, the temperature rise of the glowing bridge wire and the square value of the external radiation field intensity are in a direct proportion relationship; according to the property that the temperature rise of the glowing bridge wire is in direct proportion to the square value of the external radiation field intensity, the temperature rise obtained by the preliminary test is
Performing linear extrapolation; known temperature rise
Corresponding radiation field strength value ofE LIf the temperature of the bridge wire corresponding to 50 percent of the ignition field intensity of the tested electric explosion device rises to
And extrapolating to obtain 50% of ignition field intensity
Is composed of
Calculating the ignition field intensity of the electric explosion device in the actual installation working state according to the formula
。
The specific operation steps of the fourth step are as follows: will be provided with
Given expected working environment field intensityE bCompared with the prior art, according to the definition of the safety margin in GJB 72A-2002 electromagnetic interference and electromagnetic compatibility terminology, the electromagnetic radiation safety margin of the electric explosion device in the real-installation working state is determined by the following formula,
safety margin =
The unit: dB. (5)
The method for testing and evaluating the safety margin of the strong-field electromagnetic radiation of the actual-mounted electric explosion device is started from the ignition mechanism of the glowing bridge-wire type electric explosion device, adopts the method of optical fiber temperature measurement to test and evaluate the electromagnetic radiation safety of the electric explosion device, is tightly attached to the ignition mechanism of the electric explosion device, can accurately reflect the ignition characteristic of the electric explosion device, has almost no relation between bridge-wire temperature rise measurement and radiation frequency, can overcome the influence of the electromagnetic radiation frequency on a test result, can solve the problem of testing the electromagnetic safety of the electric explosion device with the frequency above GHz, and effectively expands the upper limit of applicable frequency; aiming at the technical problem that the electromagnetic radiation ignition performance of an electric explosion device is difficult to objectively evaluate under the existing experimental conditions (the field intensity index specified in the standard is not reached by the existing laboratory conditions, and the technical bottleneck is met by performing an effect test by simply increasing the radiation power of test equipment), based on the strong field electromagnetic radiation effect equivalent test method of the electric explosion device, the electric explosion device which is arranged in equipment and in a real-mounted state is used as a tested object to determine the electromagnetic radiation sensitivity condition of the tested object, the strong field electromagnetic radiation safety margin test evaluation method of the electric explosion device in the real-mounted state is provided, and an effective technical way is provided for testing the radiation safety of the real-mounted burning bridge wire type electric ignition and electric detonation weapon equipment in an extremely severe electromagnetic environment.
The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, features and principles described in the claims of the present invention are included in the scope of the present invention.
Claims (2)
1. A method for testing and evaluating the safety margin of strong-field electromagnetic radiation of a practical electric explosion device is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: under laboratory conditions, the ambient temperature is set to T0Carrying out a current injection or electromagnetic pulse injection effect test on the glowing bridge wire type electric explosion device, and determining 50% ignition excitation parameters and corresponding naked bridge wire ignition temperature rise value T 'of the electric explosion device'2-T0；
Step two: in the mounted state, the ambient temperature is T0Developing low field intensity electromagnetic radiation pre-test to test temperature rise value T of exposed bridge wire of electric explosion deviceL-T0；
Step three: extrapolation is carried out to obtain the ignition field intensity E 'of the electric explosion device in the actual working state'F；
Step four: e'FComparing with the given expected working environment field intensity, and calculating and determining the electromagnetic radiation safety margin of the electric explosion device in the actual installation working state;
the specific operation steps of the first step are as follows: selecting a plurality of electric explosion devices for the tested devices, wherein each electric explosion device comprises a lead, a bridge wire arranged in the lead and a medicament wrapped around the bridge wire; in a laboratory-conditioned isothermal environment T0Carrying out a current injection or electromagnetic pulse injection effect test, and determining 50% ignition excitation parameters of the electric explosion device by using a lifting method and by means of a statistical theory; removing the medicament around the bridge wire of the electric explosion device and measuring the temperatureThe device is placed close to the bridge wire, the injection test is carried out on the exposed bridge wire according to the 50% ignition excitation parameters of the tested electric explosion device, and the temperature T of the bridge wire corresponding to the 50% ignition excitation of the electric explosion device is measured2(ii) a According to the proposed bare bridge wire temperature rise calibration and prediction model, different pulse or continuous wave signal characteristics and different environmental temperatures T are obtained0Bridge wire temperature T 'corresponding to 50% ignition excitation of lower electric explosion device'2So as to obtain the corresponding electromagnetic environment and the exposed bridge wire ignition temperature rise value T 'of the electric explosion device corresponding to the 50% ignition excitation parameter under the environment temperature'2-T0；
The second step comprises the following specific operation steps: putting the tested ammunition or missile in an electromagnetic radiation field integrally, wherein the environment temperature is T in a solid state0Developing a low-field intensity electromagnetic radiation pre-test; in order to ensure the safety of the experimental process, equipment such as ammunition or guided missile is modified, and explosive in a subsequent explosion transfer sequence and medicaments around a bridge wire of an electric explosion device are removed; the electromagnetic coupling characteristic of the equipment can not be changed in the refitting process, and the circuit structure, the lead length and the space position are not changed; placing a temperature measuring sensor close to the bridgewire, connecting the temperature measuring sensor with an optical fiber temperature measuring test configuration, transmitting bridgewire temperature measuring signals to an optical fiber temperature measuring system host through optical fibers, wherein an optical fiber data acquisition module is installed on the optical fiber temperature measuring system host, and the optical fiber temperature measuring system host is electrically connected to a control test system;
the construction of the electromagnetic radiation environment in the pre-test comprises two modes: one is to simulate the desired electromagnetic environment under laboratory conditions; the other method is that equipment such as a real radar or a high-power microwave weapon and the like is directly used for carrying out electromagnetic radiation on a tested object; reasonably selecting the intensity of the electromagnetic radiation field during the preliminary test, and recording the intensity of the radiation field as ELThe accuracy of a bridge wire temperature rise test value is ensured; in a GHz frequency band, considering that the radiation range of a strong electromagnetic field which can be constructed is limited, aiming a transmitting antenna at a key part of a bomb body for irradiation, and finding the most sensitive state of the tested device; carrying out low-field electromagnetic radiation pre-test in the most sensitive state of the tested equipment to test the temperature T of the exposed bridge wire of the electric explosion deviceLThen, thenAt low field strength ELThe temperature rise value of the exposed bridge wire of the electric explosion device under the electromagnetic radiation is TL-T0；
The third step comprises the following specific operation steps: under the condition of thermal insulation or thermal equilibrium, the relationship between the input current and the temperature rise of the bridge wire satisfies I2Is proportional to Δ T; the external radiation field intensity and the bridge wire input current are in a linear relation; therefore, the temperature rise of the glowing bridge wire and the square value of the external radiation field intensity are in a direct proportion relationship; according to the property that the temperature rise of the glowing bridge wire is in direct proportion to the square value of the external radiation field intensity, the temperature rise T obtained by the preliminary testL-T0Performing linear extrapolation; known temperature rise TL-T0Corresponding radiation field strength value ELIf the temperature rise of the bridge wire corresponding to 50% of ignition field intensity of the tested electric explosion device is T'2-T0And extrapolating to obtain 50% of ignition field intensity E'FIs composed of
Calculating to obtain the ignition field intensity E 'of the electric explosion device in the actual installation working state according to the formula'F；
The fourth step comprises the following specific operation steps: e'FGiven expected working environment field intensity EbCompared with the prior art, according to the definition of the safety margin in GJB 72A-2002 electromagnetic interference and electromagnetic compatibility terminology, the electromagnetic radiation safety margin of the electric explosion device in the real-installation working state is determined by the following formula,
2. The method for testing and evaluating the safety margin of the strong-field electromagnetic radiation of the actual electric blasting device according to claim 1, wherein the ignition excitation parameters comprise the amplitude of an injection current, the pulse width, the repetition frequency and the amplitude of an electromagnetic pulse.
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| CN113267098B (en) * | 2021-04-29 | 2022-07-15 | 北京理工大学 | High-field-intensity equivalent test system and method for electromagnetic radiation effect of electric initiating explosive device |
| CN117634187B (en) * | 2023-11-28 | 2024-06-07 | 北京航空航天大学 | Safety threshold evaluation method for harm of electromagnetic field coupling discharge to fuel oil |
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