Nowadays, the development of long-distance communication technology has produced more and more powerful radar and signal transceiver systems, which all emit high-intensity electromagnetic wave energy.
In view of such inventions, the electro-weak part of the design in the electronic blasting device is sensitive.
EEDs are an electrically actuated device and are explosive and emit dazzling light. They are required for electrical devices to start.
EEDs are used in civilian applications such as fire extinguishers and automotive airbags, but what we are discussing in today's article is a military application such as aviation and one of the weapons systems. In military systems, EIDs perform a variety of functions, such as rocket boosters, exploding weapons and bullets, and propelling spacecraft. These devices are sensitive to electromagnetism. The source of interference is mainly high-level electromagnetic energy from the communication device, which may accidentally activate an unexpected explosion.
The United States Department of Defense has clarified this information in their MIL-HDBK-240 reference document, convinced that it is necessary to perform HERO tests on EEDs, by the type of equipment used. Experimental process and practice report.
 
Test steps
 
The usual procedure for HERO testing is to slow exposure, and the weapon device monitors each EID containing weapon for an EME-restricted test that may occur inside the reaction. For most EIDs, the response is quantified in terms of electromagnetic interference in the RF circuit causing a heat generating device or even the fuse in the device.
The EID fuse of the instrument system in the Department of Defense HERO process may be inferred from the RF induced current to measure the temperature rise. The important parameter is not the amplitude of the RF induced current, but the range of current action, which makes the temperature of the fuse rise sharply. In any case, it becomes acceptable to do an exercise in HERO testing to quantify the response of the EID to the current in the system over temperature. The equivalent DC current is the statistical emission data of the EID's convenient point, which is usually given by the system current.
 
recommend Test System
 
The EID instrument is specially made for HERO testing. In a munitions system, its presence makes it relatively simple to detect and monitor the RF response of the EID. However, the HERO experiment is actually comprehensive and dynamic, and the instrument is also comprehensive and challenging. A typical HERO instrument system, described in military manuals, consists of the following four basic elements:
z A sensor that can detect the RF induced response.
z A transmission line that can transmit sensor data to a receiver or readout device.
z An equipment can transmit sensor data to a desirable measurement unit.
z A device that can persistently record data.
 
Essentially, the following required instrument characteristics:
　　
1, the sensor can detect very small temperature changes, so, need to combine their temperature for very small heat.
2. The instrument system, that is, the sensor and the recording device, all of them have the ability to detect the response of a short pulse (excitation).
3. The sensor cannot change the electromagnetic characteristics.
4. The instrument system cannot change the electromagnetic characteristics of the arms during testing.
5, the instrument system can not change its electromagnetic characteristics because of EME.
6. The instrument system must be able to work continuously for the test system.
7, the instrument system must be relatively simple to operate, and compact packaging.
 
However, with regard to the important factors of the instrument it must be sensitive enough when the system is exposed to run in EME.
The instrument system must not be negatively affected by EME. An all-fiber-based system from sensors to conditioners such as Veloce 100 is a military
The FIRE HERO test method is one of the first listed options.
 
Test sensor 
  
There are many kinds of sensors measuring bridge type EIDs thermistors to make detectors. However, optical sensor-based instrumentation systems are preferred over conductive sensor-based instrumentation systems because the potentially impactive RF signature of the munitions system is eliminated due to the use of insulated instrumentation wires.
Some sensors are directly contacted by the fuse of the EID. Others are placed next to the fuse (e. g., within 0.003 feet).
The basic and optical sensors can be placed directly or even on the fuse without changing its inherent electrical characteristics and EM characteristics.
In addition, the position of the sensor/fuse is more stable and less likely to change under external influence. The sensor of the conductor cannot be approached normally, and the fuse cannot be contacted.
In the process of sensor installation to ensure that the conductor sensor is installed by mistake will have special care, in order to rest assured that his position will not change due to external influences.
The basic steps of HERO testing of ammunition equipment will be minized by zui, and the interference to EM energy will be established due to the packaging of the equipment and the coupling of RF energy to the data channel. The packaging of the instrument will be smaller and smaller and under the arms regulations under test. Optical telemetry techniques will be used to reduce the coupling of signal channels to RF energy. The extreme care can be exercised to ensure the precise measurement of the supply voltage and current of the instrument without any change to the test results. Instrument method for supplyfiber optic sensorAnd the wire used, almost precise, to achieve precise, poised measurements.
       
 
 FISO Reliable EED Test Scheme
 
FOT-HERO sensors and VELOCE-100 signal conditioners are specifically designed for HERO's electromagnetic shielding and EMC.optical fiber temperature sensorIt can be immune to EMI with EED, operates in real time, has an extremely fast response and is extremely sensitive. Only 150mil micro
Small size, as well as his low calorific value, the FOT-HERO sensor calorific value is almost seen to be instantaneous. Since the FOT-HERO sensor is based on fiber optic sensing technology, it is inherently inert to EME.
FOT-HERO sensors provide, on purpose, an extremely fast response time, faster than 275 milliseconds (rise time is defined as the portion of the output between 10% and 90%). Independent of one cycle, the sensor response time is better than 1 millisecond, which is also intentional. Depending on the application, the test conditions must be better than 3mA sensitivity. The VELOCE-100 system is made up of FOT-HERO sensors to provide a unique reference for EED safety testing in conjunction with the use of instruments. The system monitors the EEDs in real time as they are bombarded by electromagnetic interference.
FOT-HERO sensors are exposed and available, ready for field installation, even for installation on a squib. The principle of the Veloce 100 system is based on white light interferometry. The signal conditioner includes a light source and a detector. For each variable module, the detector and light source are internally coupled and the optical fiber is wired to the front panel of the signal conditioner,fiber optic sensorConnected by a highly stable ST type optical coupler. External extension lines are very useful. The system can be up to 200K sampling frequency and can calculate the average result, as the test is necessary.
 Application example
 
A typical application for Veloce 100 and FOT-HERO sensors is to determine the appropriate distance between two tanks and a decoy rocket so as not to interfere with any incidental activity causing any EID. Due to the system, the army will make decisions, such as the distance that zui can approach can be recognized by the current established constraints. The army conducts mobile tactical force assessments and orders military vehicles to conduct military operations approaching decoy rockets and helicopters that are fully or unfully loaded. The decoy launcher is loaded with CCU-41B and CCU-136A ammunition. Earlier laboratory tests showed the magnetization coefficient inside the cartridge, so a limit of 50 meters is appropriate for any VHF radio waves. These constraints quite contain Tac Eval. Therefore, QETE is called unless restrictions are relaxed. With the FISO instrument, the cartridge is utilized and the appropriate metal shred foil and flash bombs are modified to re-establish the actual installation making close to possible.
 
Test steps
 
The test consists of listening to the frequency of the distance and power given by the special. If an explosion occurs, the distance increases up to a safe limit.
Various types of cartridge weapons with) metal shattered foil are inserted into the decoy rocket, and the media on both sides of the launcher are 5,10 or even 20 meters away. The cartridge weapon is 25 meters on each side, and a total of 50 meters of test runs.
A series of test frequency results are as follows: unit M Hz
1) 33.2 3) 35.0 5) 41.1 7) 44.6
2) 34.9 4) 39.8 6) 42.4 8) 45.7
 
measurement method
 
Every test, in every complete 20 secondsCurrentmeasured and recorded. The transmitter is inactive when any fuse current changes until the indicator gives a 5 second flag signal. (even below 8mA)
 
Conclusion
 
When a series of tests at a distance of 5 meters from the transmitter are performed later, without recording any important interference, it is convincing that longer distance tests will be carried out. This is also very firm, in the absence of radio waves and the presence of frequency adventure. As long as the radio receiving device is used TACEVAL operating in a similar frequency range, there is no significant power impact.
The special environment of the Veloce system at VHF frequencies, reducing the operating distance limit to an acceptable 50 meters to 5 meters is acceptable.
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