Diagnostic Capabilities for Electromagnetic Railguns

Haran, Terence L.; Hoffman, Ryan B.; Lane, Sarah E.

doi:10.1109/tps.2013.2248026

Cited by 24 publications

(10 citation statements)

References 8 publications

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“…Recently, it was demonstrated that high-amplitude pulsed magnetic fields could be measured using novel CMR-B-scalar sensors based on the colossal magnetoresistance effect (CMR) of polycrystalline nanostructured manganite (La-Sr-Mn-O) films [ 18 , 19 , 20 ]. These sensors can measure high-magnitude pulsed magnetic fields of millisecond duration in very small volumes.…”

Section: Introductionmentioning

confidence: 99%

“…These sensors can measure high-magnitude pulsed magnetic fields of millisecond duration in very small volumes. It was concluded in [ 19 ] that differential B-dot sensors which have a directional response can be replaced by CMR sensors which are viable for railgun applications where directionality is not required. These sensors have the advantage of measuring the magnetic field independently of the direction, which allows for their easier installation into the measuring position because it does not require an exact orientation of the sensor concerning the magnetic field direction.…”

Section: Introductionmentioning

confidence: 99%

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Measurement System for Short-Pulsed Magnetic Fields

Stankevič

Kersulis

Dilys

et al. 2023

Sensors

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A measurement system based on the colossal magnetoresistance CMR-B-scalar sensor was developed for the measurement of short-duration high-amplitude magnetic fields. The system consists of a magnetic field sensor made from thin nanostructured manganite film with minimized memory effect, and a magnetic field recording module. The memory effect of the La1−xSrx(Mn1−yCoy)zO3 manganite films doped with different amounts of Co and Mn was investigated by measuring the magnetoresistance (MR) and resistance relaxation in pulsed magnetic fields up to 20 T in the temperature range of 80–365 K. It was found that for low-temperature applications, films doped with Co (LSMCO) are preferable due to the minimized magnetic memory effect at these temperatures, compared with LSMO films without Co. For applications at temperatures higher than room temperature, nanostructured manganite LSMO films with increased Mn content above the stoichiometric level have to be used. These films do not exhibit magnetic memory effects and have higher MR values. To avoid parasitic signal due to electromotive forces appearing in the transmission line of the sensor during measurement of short-pulsed magnetic fields, a bipolar-pulsed voltage supply for the sensor was used. For signal recording, a measurement module consisting of a pulsed voltage generator with a frequency up to 12.5 MHz, a 16-bit ADC with a sampling rate of 25 MHz, and a microprocessor was proposed. The circuit of the measurement module was shielded against low- and high-frequency electromagnetic noise, and the recorded signal was transmitted to a personal computer using a fiber optic link. The system was tested using magnetic field generators, generating magnetic fields with pulse durations ranging from 3 to 20 μs. The developed magnetic field measurement system can be used for the measurement of high-pulsed magnetic fields with pulse durations in the order of microseconds in different fields of science and industry.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement System for Short-Pulsed Magnetic Fields

Stankevič

Kersulis

Dilys

et al. 2023

Sensors

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“…These were used for the measurement of magnetic field distribution, see Liebfried et al [ 14 ], and the diffusion processes in railguns, see Schneider et al [ 15 ]. Moreover, Haran et al [ 16 ] demonstrated that during the diagnostics of a high-velocity railgun projectile launch, these sensors can provide a measure of the total magnetic field present at a particular location in the launcher and are a suitable instrument for measuring this field with high resolution in both space and time. In addition, these CMR-B-scalar sensors were used for the measurement of highly inhomogeneous transient magnetic fields during coilgun experiments [ 17 ] and the distribution of these magnetic fields inside nondestructive pulsed magnets [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Measurements during Magnetic Pulse Welding Using CMR-B-Scalar Sensors

Stankevič

Lueg‐Althoff

Hahn

et al. 2020

Sensors

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The possibility of applying CMR-B-scalar sensors made from thin manganite films exhibiting the colossal magnetoresistance effect as a fast-nondestructive method for the evaluation of the quality of the magnetic pulse welding (MPW) process is investigated in this paper. This method based on magnetic field magnitude measurements in the vicinity of the tools and joining parts was tested during the electromagnetic compression and MPW of an aluminum flyer tube with a steel parent. The testing setup used for the investigation allowed the simultaneous measurement of the flyer displacement, its velocity, and the magnitude of the magnetic field close to the flyer. The experimental results and simulations showed that, during the welding of the aluminum tube with the steel parent, the maximum magnetic field in the gap between the field shaper and the flyer is achieved much earlier than the maximum of the current pulse of the coil and that the first half-wave pulse of the magnetic field has two peaks. It was also found that the time instant of the minimum between these peaks depends on the charging energy of the capacitors and is associated with the collision of the flyer with the parent. Together with the first peak maximum and its time-position, this characteristic could be an indication of the welding quality. These results were confirmed by simultaneous measurements of the flyer displacement and velocity, as well as a numerical simulation of the magnetic field dynamics. The relationship between the peculiarities of the magnetic field pulse and the quality of the welding process is discussed. It was demonstrated that the proposed method of magnetic field measurement during magnetic pulse welding in combination with subsequent peel testing could be used as a nondestructive method for the monitoring of the quality of the welding process.

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“…When optical-fiber-based electric field measurements are used in dynamic environments, the optical fibers are exposed to vibrational and acoustic waves. These waves cause noise that can be greater than the electric-fieldrelated signal being measured [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%