Topic
Rise time
About: Rise time is a research topic. Over the lifetime, 4748 publications have been published within this topic receiving 47512 citations.
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TL;DR: In this article, a dynamic pressure testing or calibration system is presented for characterizing pressure sensors, such as transducers, by using a pre-specified impulse (pressure pulse) of fluid such as air, nitrogen, or helium.
Abstract: A dynamic pressure testing or calibration system packaged as a portable unit for characterizing pressure sensors, such as transducers. Embodiments are packaged for carry on the body, are battery-operated, compatible with existing transducer mounts, and quickly learned and easily used by a single operator. The system supplies a pre-specified impulse (pressure pulse) of fluid, preferably a benign gas, such as air, or an inert gas such as helium or nitrogen. In select embodiments, the gas pulse has a fast rise time and its amplitude may be varied over a pre-specified dynamic range. For example, the rise time may emulate that of an impulse created during an explosion by a resultant pressure wave, i.e., less than 100 microseconds. Embodiments also incorporate a data acquisition capability that accurately captures and records both the supplied impulse and the response of the sensor under test.
13 citations
Patent•
18 Mar 1997
TL;DR: In this paper, the peak level 9 and the peak time 18 of the pulse quantization signal 4 of a pulse video signal 2 are detected by a peak detector. And the correlation of a video pulse signal 2 is taken by the peak-level 9, pulse width 17 and each inclination 21, 26, and classification is performed.
Abstract: PROBLEM TO BE SOLVED: To separate them as a different pulse signal even if a peak level and level width are same by adding inclination equivalent in a significant pulse rise waveform or fall waveform specific part and analyzing and classifying a pulse train. SOLUTION: The peak level 9 and the peak time 18 of the pulse quantization signal 4 of a pulse video signal 2 is detected by a peak detector. A pulse rise inclination calculator divides a difference ΔPA1 between the peak level 9 and a rise level 19 by a difference Δt1 between the peak time 18 and a rise time 13, and finds rise inclination 21. An intermediate rise inclination calculator divides a difference ΔPA2 between the peak level 49 and an intermediate rise level 23 nearest the intermediate level of the peak level 9 and the rise level 19 in the rise level 19 by a difference Δt2 between an intermediate rise time 24 and the rise time 13, and finds intermediate rise inclination 26. Correlation of a video pulse signal 2 is taken by the peak level 9, pulse width 17 and each inclination 21, 26, and classification is performed.
13 citations
TL;DR: To investigate the high-altitude electromagnetic pulse (HEMP) immunity of electrical equipment in operation, a 10-kV transmission line (TL) experimental platform is built and some 10-KV pin-type porcelain insulators are tested under different conditions, which shows the capacity of the proposed platform to test immunity of 10- kV electrical equipment.
Abstract: To investigate the high-altitude electromagnetic pulse (HEMP) immunity of electrical equipment in operation, a 10-kV transmission line (TL) experimental platform is built in this paper. The conducted transient electromagnetic disturbance (TED) could be injected to the electrical equipment of 10-kV TL with power on or power off. The TED is produced by the pulsed current injection (PCI) generator, whose rise time is less than 20 ns and full width at half maximum is in the range of 500 ∼ 550 ns on short-circuit state with 60 Ω resistor. On the other hand, the 10-kV TL is equivalently designed in cross section to make its characteristic impedance being 330 Ω to conform to the value of practical case. The voltages and currents applied on the tested equipment can be measured at nano-second level simultaneously, which are of great use to learn the effect mechanisms and compare the results under different working conditions. Some 10-kV pin-type porcelain insulators are tested under different conditions, which shows the capacity of the proposed platform to test immunity of 10-kV electrical equipment.
13 citations
TL;DR: In this article, conditions at which two current pulses of ranaway electron beams are generated in elevated-pressure nitrogen during one voltage pulse were investigated and it was shown that the regime with two runaway electron beam current pulses takes place at decreased values of the electric field strength E in the gap (or decreased value of the parameter E/p, where p is the gas pressure).
Abstract: Conditions are investigated at which two current pulses of ranaway electron beams are generated in elevated-pressure nitrogen during one voltage pulse. It is shown that the regime with two runaway electron beam current pulses takes place at decreased values of the electric field strength E in the gap (or decreased values of the parameter E/p, where p is the gas pressure). The regime with two runaway electron beam current pulses is observed both at high (1500–3000 Torr) and low (below 100 Torr) pressures. It is shown that, for the second runaway electron beam current pulse to form, the voltage across the gap should be partially reduced during the first pulse. At low nitrogen pressures (~10 Torr), the regime in which two runaway electron beams are generated can be implemented by increasing the breakdown strength of the gap and/or increasing the value of E/p. In experiments carried out in atmospheric-pressure air with a picosecond time resolution, a rather complicated structure of the beam current pulse is observed at a voltage rise time of ~300 ps.
13 citations
TL;DR: In this paper, the authors presented the first time MeV electron flux rise times near the equator as estimated from 5 1 2 years of data from the NS41 Global Positioning System (GPS) satellite, in an effort to relate measured electron flux increase timescales with those predicted by theory.
13 citations