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: It is shown that a Z-transform-based time-response analysis of the electro-optical response of a crystal to a step voltage with a short rise time allows one to obtain the dispersion of the Electro-optic coefficients over a wide frequency range.
Abstract: We show that a Z-transform-based time-response analysis of the electro-optical response of a crystal to a step voltage with a short rise time allows one to obtain the dispersion of the electro-optical coefficients over a wide frequency range. We describe the method employed and present the results obtained for the main electroptic coefficients (r22, r61, and rc) of a standard LiNbO3 crystal. We also show that this method is able to provide even small values of the electro-optic coefficient as well as the dispersion within a wide frequency range, which is limited only by the rise time of the step voltage.
25 citations
TL;DR: In this article, the use of rise times to estimate the attenuation of seismic body waves is examined numerically and the method is extended to include the fall time of a pulse.
Abstract: Summary.
Gladwin & Stacey and others have shown that if Q (the specific quality factor) is independent of frequency, or nearly so, then the rise time of a seismic pulse is proportional to the anelastic attenuation it has experienced during propagation. In this paper the use of rise times to estimate the attenuation of seismic body wavesis examined numerically and the method is extended to include the fall time of a pulse. Although the proportionality of both rise and fall time with attenuation is shown here to be valid only for an impulse source function it is possible to estimate the maximum attenuation experienced by a seismic pulse from the source to the receiver with no a priori assumptions about the shape of the radiated pulse.
The method, developed for a constant Q model, can still be applied if Q has an acceptable power-law dependency on frequency. Application to teleseismic body waves from earthquakes and an underground nuclear explosion indicates that transmission paths exist over which the attenuation is much lower than is often assumed in seismogram modelling.
25 citations
TL;DR: In this article, a simple method of generating high peak power pulses with nanosecond rise times is described based on the use of a drift step recovery diode (DSRD) in an inductive-capacitive storage circuit.
Abstract: A simple method of generating high peak power pulses with nanosecond rise times is described. This method is based on the use of a drift step recovery diode (DSRD) in an inductive‐capacitive storage circuit. A method for sharpening the rise time of the pulses generated using the DSRD to the subnanosecond range is also described. Experimental results show that pulses can be generated with amplitudes of 1.7 kV (into 50 Ω), rise times in the hundreds of picoseconds, and repetition rates of 10 kHz.
25 citations
TL;DR: The effect of turbulence intensity and propagation distance is to flatten the rise time and peak pressure distributions, which means thatounded waveforms are always more common than peaked waveforms.
Abstract: A model experiment was reported to be successful in simulating the propagation of sonic booms through a turbulent atmosphere [B. Lipkens and D. T. Blackstock, J. Acoust. Soc. Am. 103, 148–158 (1998)]. In this study the effect on N wave characteristics of turbulence intensity and propagation distance through turbulence are investigated. The main parameters of interest are the rise time and the peak pressure. The effect of turbulence intensity and propagation distance is to flatten the rise time and peak pressure distributions. Rise time and peak pressure distributions always have positive skewness after propagation through turbulence. Average rise time grows with turbulence intensity and propagation distance. The scattering of rise time data is one-sided, i.e., rise times are almost always increased by turbulence. Average peak pressure decreases slowly with turbulence intensity and propagation distance. For the reported data a threefold increase in average rise time is observed and a maximum decrease of about 20% in average peak pressure. Rise times more than ten times that of the no-turbulence value are observed. At most, the maximum peak pressure doubles after propagation through turbulence, and the minimum peak pressure values are about one-half the no-turbulence values. Rounded waveforms are always more common than peaked waveforms.
25 citations
TL;DR: In this paper, a photodetector based on multiple WO3 nanowires for ultra-violet detection is presented, which exhibits a photo-to-dark current ratio of the order of 4 with a high relative change in conductance around 8100 upon 340 nm illumination at 0.87 mW/cm2.
Abstract: This work presents the fabrication of a photodetector based on multiple WO3 nanowires for ultra-violet detection. This photodetector exhibits a photo-to-dark current ratio of the order of 4 with a high relative change in conductance around 8100 upon 340 nm illumination at 0.87 mW/cm2. The photodetector exhibits a high responsivity of 47.3 A/W and a high 340 nm–450 nm rejection ratio of ∼8800 with excellent stability. A low noise equivalent power of 0.37 fW/√Hz and a high detectivity of ∼1012 Jones are observed. We obtained a fast response with a rise time (tr) of 112 μs and a fall time (tf) of 84 μs. These promising results demonstrate the applicability of the photodetector for high speed ultra-violet detection.
25 citations