Highly Local Measurements of Strong Transient Magnetic Fields During Railgun Experiments Using CMR-Based Sensors

Schneider, M.; Schneider, R.; Stankevič, Voitech; Balevičius, Saulius; Žurauskienė, N.

doi:10.1109/tmag.2006.887706

Cited by 40 publications

(18 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This allowed us B-field measurements very close to the rails. The details of the sensor design are described in [1].…”

Section: Measurement Setupmentioning

confidence: 99%

“…A new kind of sensor, consisting of thin manganite films exhibiting the colossal magnetoresistance effect (CMR), is able to measure B-fields up to 40 T under electromagnetic launch conditions [1]. A new generation of CMR-B-Scalar sensors, used for the experiments presented in this paper, has a very small volume and is therefore suitable to measure the B-field distribution close to the rails.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of the Magnetic Field Distribution in Railguns Using CMR-B-Scalar Sensors

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…This allowed us B-field measurements very close to the rails. The details of the sensor design are described in [1].…”

Section: Measurement Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of the Magnetic Field Distribution in Railguns Using CMR-B-Scalar Sensors

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…This sensor type is very small and can be used to measure the absolute value of pulsed magnetic flux densities up to 40 T. An array of such sensors was successfully used to investigate the current distribution in the rails of a railgun by measuring the magnetic field distribution in the vicinity of the rail [15]- [17]. The measurement showed the presence of the VSE.…”

Section: Introductionmentioning

confidence: 99%

Velocity-induced current profiles inside the rails of an electric launcher

Liebfried

Schneider

Stankevič

et al. 2012

2012 16th International Symposium on Electromagnetic Launch Technology

Self Cite

View full text Add to dashboard Cite

Previous investigations showed that an array of novel CMR-B-scalar sensors based on the Colossal Magnetoresistance effect can be used to measure the magnetic field distribution in the vicinity of the rails of a railgun. However, the data obtained suffered from electromagnetic interference. Therefore, the measurement system was considerably improved with respect to the signal quality. In this publication the results obtained during the dynamic operation of the ISL railgun RAFIRA are presented. The magnetic field distribution in the vicinity of the rails was measured at different armature velocities. Additional information was obtained using high-speed camera snapshots. The experimental results are compared with simulations performed with the finite element code COMSOL Multiphysics. In particular, the influence of the armature current on the measurements is discussed. It is concluded that the magnetic field distribution in the vicinity of the rails clearly indicates an increased current concentration in the rear part of the armature-rail contact interface. Moreover, the current concentration depends on the speed of the armature. Velocitydependent skin depths at the surface of aluminum (Dural) rails for projectile velocities ranging between 750 m/s and 1500 m/s are given.

show abstract

“…The French-German Research Institute in Saint-Louis, France (ISL), in conjunction with the Semiconductor Physics Institute (SPI), has developed Colossal Magneto-Resistance (CMR) sensors for measuring B-field dynamics during a railgun launch [1], [2]. These sensors exhibit a very large change in electrical resistance as a function of incident magnetic field and can therefore be used to accurately measure those fields with very fast response times.…”

Section: A Colossal Magneto-resistance Sensorsmentioning

confidence: 99%

Diagnostic capabilities for electromagnetic railguns

Hoffman

Haran

Lane

2012

2012 16th International Symposium on Electromagnetic Launch Technology

View full text Add to dashboard Cite

In the past 30 years, there have been significant advances in the development of modeling and simulation algorithms for electromagnetic railguns. The development of instrumentation capable of measuring the physical parameters that occur during a high velocity launch, however, has not kept pace with the advances in modeling capabilities. In addition, there has been an increase in the size and complexity of existing railguns and therefore it has become necessary to find instrumentation that has the flexibility to conform to the variations present from one railgun to the next, to aid in the cross-utilization of instrumentation across the community. This paper will describe results from Georgia Tech and Navy efforts to evaluate diagnostic techniques that measure different phenomenon at higher resolution in both time and space in order to provide the data needed to validate railgun models. The diagnostics described here address all aspects of railgun testing, including the launcher, projectile, and pulsed power supplies and all phases of the evaluation process from validation of modeling and simulation tools to structural health monitoring. Specific quantities for which diagnostics will be described include temperature, electric and magnetic field sensors, and strain measurements. Examples of electromagnetic sensors that will be presented include colossal magneto-resistance (CMR) sensors, which respond to changes in a magnetic field with a change in resistance, and a slab coupled optical sensor (SCOS) for detecting electric fields. Test results from railguns at both Georgia Tech and ISL will be described.

show abstract

Highly Local Measurements of Strong Transient Magnetic Fields During Railgun Experiments Using CMR-Based Sensors

Cited by 40 publications

References 11 publications

Measurement of the Magnetic Field Distribution in Railguns Using CMR-B-Scalar Sensors

Measurement of the Magnetic Field Distribution in Railguns Using CMR-B-Scalar Sensors

Velocity-induced current profiles inside the rails of an electric launcher

Diagnostic capabilities for electromagnetic railguns

Contact Info

Product

Resources

About