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Strain-Based Measurement Introduction:FIGURE 1-23. The Net Accelerometer Output:mV+10 mV-10 mVAccelerometer Output Component at 100HzPeak Magnitude = 1mV/g X 10 g = ± 10 mVTimemV+100 mVAccelerometer Output Component at 1,000HzPeak Magnitude = 1mV/g X 1g X 100 = ± 100mV0 mVTime-100 mV+110 mVNet Accelerometer Output+100 mV+90 mV0 mVTime- 90 mV-100 mV-110 mVThe Fast Fourier Transform algorithm (FFT) is a method by which the numberof computations required to compute the Fourier series is dramatically reducedfrom N 2 calculations to Nlog 2 N calculations, allowing high-speed computersto rapidly compute the Fourier Spectrum and plot it as the power spectral density.The power spectral density is the plot of the relative magnitudes of each ofthe Fourier components as a function of frequency.CHAPTER 1-44 The Art of Practical and Precise Strain Based Measurement 2nd Edition © 1999
Applications Note 1-8:Applications Note 1-8:Zeroth-, First-, and Second-Order System DeÞnitionsThe definition of the order of a sensor is basically the generalized classification ofthe transfer function of the sensor.The Zero-Order Sensor:The zero-order sensor is sometimes referred to as the ÒZerothÓ order system,where the output of the sensor is a linear function of the input where,in theory at least, this relationship remains valid at all frequencies. Thezero-order sensor structure is not realizable in practice; however, some sensorswill behave very much like zero-order sensors over limited bandwidthsin frequency. The zero-order system is shown in Figure 1-22 andcharacterized as follows:F out (t) = K F in (t) (EQ 1-8)Where: F out (t) = The output function with respect to time.F in (t) = The input function with respect to time.K = The proportionality constant.FIGURE 1-24. The Zero-Order Response:.Input/OutputMagnitudeInputOutput(LVDTResponse)TimeThe Art of Practical and Precise Strain Based Measurement 2nd Edition © 1999 CHAPTER 1-45
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The Art of Practical andPrecise Str
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Special Credits:Mrs. Helen Pierson,
Page 5 and 6: Table of ContentsBy James G. Pierso
Page 8 and 9: ContentsApplications Note 4-10:Lead
Page 10: ContentsCHAPTER 8Electrical Conside
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Page 35 and 36: Applications Note 1-6:and where:j i
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