Dynamic Response of Strain Gages up to 300 KHz

摘要

Dynamic response of foil strain gages is inves- tigated in the ranges of up to approximately 300 KHz in fre- quency, 2000 με in strain and 750 s~(-1) in strain rate. Impulsive input is applied to the gages using elastic wave pulses in a circular bar. The input is determined by measuring the veloc- ity of the bar end with a laser interferometer. It was confirmed that devitions from the static gage factors do not exceed -5 percent within the frequency range up to 45 KHz, 110 KHz and more than 290 KHz for 20-mm, 10-mm and 3-mm gages, respectively, and that the gage length is the dominant fac- tor in the gages' frequency characteristics This paper also mentions self-generated voltages.