Research On The Technology Of Electro-thermal Chemical Gun (ETCG) Chamber Pressure

The accurate, reliable and dynamic chamber pressure parameter (hereinafter referred to asthe chamber pressure) of ETCG played an important role in the ignition and enhancement ofplasma generator, the rationality of charge structure, the muzzle velocity forecast of exteriorballistics as well as the strength and stiffness design of ETCG .When the ETCG launched,there were problems of serious electromagnetic interferences which were generated by thehigh-voltage pulse and discharge of pulse current, coupled into the pressure measurementcircuit in the form of electric field, magnetic field and electromagnetic field by conductedcoupling and radiated coupling and had severe impacts on the accuracy of transientparameters. At the same time, the voltage fluctuation even endangered the safety of the testequipment and laboratory personnel. Under the action of serious electromagnetic environmentfactors, it was particularly important to improve the security, reliability and accuracy of thetest system.On the basis of analyzing serious electromagnetic interference sources and theircharacteristics, measurement technology that combined storage measurement with opticalfiber communication technology was proposed for ETCG chamber pressure and the sitestorage and remote online integrated test system was designed. EMC of test system wasdesigned in the view of PCB EMC, shielding technique based on multi-layer combinations ofdifferent materials, grounding and filtering techniques and optical isolation technique. What ismore, the electromagnetic shielding effectiveness of test system was analyzed and calculatedin detail. Encoding and decoding of optical fiber communication based on CMI was designed,which solved the DC baseline drift and avoided false triggering of the receiver. Real-time datatransmission and duplex communication was realized with integrated transceiver opticalmodules and digital optical fiber. The hardware and software design process and calibration method of site storage subsystem and remote online subsystem was described in detail and theuncertainty of test results was also analyzed in quantity. The test result in shooting rangeshowed the site storage and remote online integrated test system is featured for goodelectromagnetic compatibility, high reliability, high precision, real-time transmission, duplexcommunication and other characteristics and provided testing method for the study of ETCGballistic characteristics. The technology can expand the application to the test of transientparameters in the electromagnetic environment and have broad application prospects andpromotional value in modern electronic shooting range, military testing and so on.