Abstract
In dynamic-strain measurements of wave-propagation phenomena using an oscilloscope, a trigger signal is necessary to initiate the single-sweep operation. This technical note describes the use of an analog differentiator to produce reliable trigger signals by differentiating the output of a trigger strain gage. It is shown that the differentiator produces a strong trigger signal with a delay of less than 5-μs duration.
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Abbreviations
- E i :
-
input voltage to the differentiator
- E o :
-
output of the differentiator
- e i (s) :
-
Laplace transform of the input voltageE i
- e o (s) :
-
Laplace transform of the output voltageE o
- s :
-
transform parameter
- t :
-
time
- A(s) :
-
open-loop gain of the operational amplifier
- R i ,R f :
-
resistances
- C i ,C f :
-
capacitances
- Z(s) :
-
impedances of the capacitance and resistance
- i(s) :
-
transform of the current
References
Hoft, D., “Applying the Analog Differentiator,”Analog Dialogue, Analog Devices, Inc., Cambridge, MA (June1970).
Korn, G. A. andKorn, T. M., “Electronic Analog Computer,”McGraw-Hill Book Company, Inc., New York (1956).
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Ranganath, S. An improved method of triggering oscilloscopes for dynamic-strain measurements. Experimental Mechanics 13, 397–400 (1973). https://doi.org/10.1007/BF02324044
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DOI: https://doi.org/10.1007/BF02324044