Characterization of an optical multilayer hydrophone with constant frequency response in the range from 1 to 75 MHz

2003 ◽  
Vol 113 (3) ◽  
pp. 1431-1438 ◽  
Author(s):  
Volker Wilkens
Keyword(s):  
Frequency Response ◽  
Constant Frequency

Characterization of optoacoustic transducers through the analysis of angular-dependent frequency response

2009 ◽  
Author(s):  
André Conjusteau ◽  
Sergey A. Ermilov ◽  
Richard Su ◽  
Hans-Peter Brecht ◽  
Matthew P. Fronheiser ◽  
...  
Keyword(s):  
Frequency Response ◽  
Dependent Frequency

Dynamics of sensory afferent synaptic transmission in aortic baroreceptor regions on nucleus tractus solitarius

1995 ◽  
Vol 74 (4) ◽  
pp. 1518-1528 ◽  
Author(s):  
M. C. Andresen ◽  
M. Yang
Keyword(s):  
Action Potential ◽  
Synaptic Transmission ◽  
Frequency Response ◽  
Action Potentials ◽  
Nucleus Tractus Solitarius ◽  
Reversal Potential ◽  
Constant Frequency ◽  
Epsp Amplitude ◽  
Postsynaptic Potentials ◽  
Medial Nucleus

1. Synaptic responses of medial nucleus tractus solitarius (mNTS) neurons to solitary tract (ST) activation were studied in a horizontal brain slice preparation of the rat medulla. Slices included sections of ST sufficiently long that the ST could be electrically activated several millimeters from the recording site of cell bodies in mNTS. 2. Three types of synaptic events were evoked in response to ST stimulation: simple excitatory postsynaptic potentials (EPSPs), simple inhibitory postsynaptic potentials (IPSPs), and complex EPSP-IPSP sequences. Simple EPSPs had substantially shorter latencies than IPSPs (3.39 +/- 0.65 ms, mean +/- SE, n = 42, vs. 5.86 +/- 0.71 ms, n = 6, respectively). 3. EPSP amplitude increased linearly with increasing hyperpolarization, with an extrapolated reversal potential near 0 mV. 4. EPSPs were maximal at < 0.5 Hz of sustained, constant-frequency ST stimulation (n = 14). EPSP amplitude declined to an average of 57.5% of control at 10 Hz after 2 s of sustained stimulation. With 1 min of sustained, 100-Hz stimulation, EPSP amplitude declined to near zero. 5. With stimuli intermittently delivered as 100-ms bursts every 300 ms, generally comparable average EPSPs were evoked during constant and burst patterns of ST stimulation. The amplitude of the initial EPSP in each burst was very well maintained even at intraburst stimulation rates of 100 Hz. 6. At resting membrane potentials, low constant frequencies of ST stimulation (< 5 Hz) reliably elicited action potentials and suppressed spontaneous spiking, but higher frequencies led to spike failures (> 85% at 100 Hz). Between 5 and 10 Hz, this periodic stimulation-suppression cycle clearly entrained action potential activity to the ST stimuli. Similar patterns of current pulses (5 ms) reliably evoked action potentials with each pulse to higher frequencies (50 Hz) without failures, and entrainment was similar to ST stimulation. 7. In a subset of nucleus tractus solitarius (NTS) neurons (3 of 9 studied), bursts of ST stimuli were as much as 50% more effective at transmitting high frequencies (> 10 Hz) of ST stimulation than the equivalent constant frequencies (P < 0.0001). 8. The long-latency simple IPSPs with no preceding EPSPs reversed to become depolarizing at potentials more negative than -62.9 +/- 7.0 mV (n = 5) and were blocked by the non-N-methyl-D-aspartate antagonist 6-cyano-7-nitroquinoxaline-2,3-dione (n = 3). The ST stimulation frequency-response relation of these IPSPs was similar to that for the short-latency EPSP response excited by ST synapses. Thus these IPSPs appear to be activated polysynaptically via a glutamatergic-GABAergic sequence in response to ST activation. 9. The results suggest that sensory afferent synapses in mNTS have limited transmission of high-frequency inputs. Both synaptic transmission and the characteristics of the postsynaptic neuron importantly contribute to the action potential transmission from afferent to NTS neuron and beyond. This overall frequency response limitation may contribute to the accommodation of reflex responses from sensory afferent inputs such as arterial baroreceptors within their physiological discharge frequency range.

scholarly journals Characterization of an analog-to-digital converter frequency response by a Josephson arbitrary waveform synthesizer

2019 ◽  
Vol 30 (3) ◽  
pp. 035006 ◽  
Author(s):  
Javier Díaz de Aguilar ◽  
J R Salinas ◽  
Oliver Kieler ◽  
Raúl Caballero ◽  
Ralf Behr ◽  
...  
Keyword(s):  
Frequency Response ◽  
Analog To Digital Converter ◽  
Digital Converter ◽  
Analog To Digital ◽  
Arbitrary Waveform

Dynamic characterization of a mechanical coupling for a rotating shaft

2010 ◽  
Vol 225 (3) ◽  
pp. 604-616 ◽  
Author(s):  
A T Tadeo ◽  
K L Cavalca ◽  
M J Brennan
Keyword(s):  
Frequency Response ◽  
Response Functions ◽  
Dynamic Characterization ◽  
Rotating Shaft ◽  
Frequency Response Functions ◽  
Mechanical Coupling ◽  
Lumped Parameter ◽  
Parameter Coupling ◽  
Stiffness And Damping

This article concerns the dynamic characterization of a flexible coupling that connects two co-axial shafts. Four different lumped parameter coupling models from the literature are investigated to see which model could best predict the dynamic behaviour of the coupling. The finite-element method was used to model the rotor dynamic system incorporating the coupling. Frequency response functions from this model were compared with measured frequency response functions from the rotor test rig with the shaft and coupling rotating at a specific speed. Parameters from the model were adjusted to minimize an objective function involving the measured and predicted frequency response functions. It was found that the simplest model of the coupling that could reasonably represent the coupling involves rotational (bending) stiffness and damping.

scholarly journals Modeling and characterization of an electromagnetic system for the estimation of Frequency Response Function of spindle

2018 ◽  
Vol 104 ◽  
pp. 294-304 ◽  
Author(s):  
David Tlalolini ◽  
Mathieu Ritou ◽  
Clément Rabréau ◽  
Sébastien Le Loch ◽  
Benoit Furet
Keyword(s):  
Frequency Response ◽  
Response Function ◽  
Frequency Response Function ◽  
Electromagnetic System

Model-based frequency response characterization of a digital-image analysis system for epifluorescence microscopy

1992 ◽  
Vol 31 (8) ◽  
pp. 1083
Author(s):  
Rajeeb Hazra ◽  
Charles L. Viles ◽  
Stephen K. Park ◽  
Stephen E. Reichenbach ◽  
Michael E. Sieracki
Keyword(s):  
Image Analysis ◽  
Frequency Response ◽  
Digital Image ◽  
Digital Image Analysis ◽  
Epifluorescence Microscopy ◽  
Image Analysis System ◽  
Model Based ◽  
Analysis System ◽  
Digital Image Analysis System
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