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Strain-Based Measurement Introduction:FIGURE 1-6. Spatial Independence:Static PressureThe requirement for spatialindependence is satisfiedPressure SensorThe requirement for spatialindependence is NOT satisfiedConstant Pressure linePressure SensorTurbulent Flow FieldSensor active diameterConstant Pressure lineThe requirement for spatialindependence is satisfied Pressure Sensor Turbulent Flow FieldSensor active diameterThe concept of spatial independence implies that the transfer function of anygiven sensor is only valid within a specific frequency band related to the phys-CHAPTER 1-20 The Art of Practical and Precise Strain Based Measurement 2nd Edition © 1999
Applications Note 1-6:ical size of the sensorÕs active member. For the measurement of higher frequencies,spatial independence will require that smaller and smaller sensors beemployed in any given medium.The Nature of the Measurand:Measurands may be scalar quantities such as voltage, current, or temperature,meaning that they can be completely specified by magnitude alone. Other measurandsmay be vector quantities such as velocity, acceleration, and force, requiring adirection and magnitude to define the measurand.The effectiveness of the flush-diaphragm pressure sensor in sensing a pressureshock wave is a good example in that the wave has magnitude as well as directionand the sensor will not respond with equal outputs depending upon the angle of thewave relative to the sensor surface. In cases such as this, the sensor would alsorequire a Òfield responsivityÓ calibration in order to define the sensitivity of thedevice as a function of angle relative to a measurand input.Microphones are typically calibrated to show the field responsivity of this sensortype to measurand inputs at various angles to the sensor active member.The System Transfer Function:Bearing in mind the requirements of spatial independence, and the fact that thedefinition of the field responsivity of a sensor may also be necessary in order todefine the total response of the sensor, the transfer function of the measurementsystem is as shown in Figure 1-7.The Art of Practical and Precise Strain Based Measurement 2nd Edition © 1999 CHAPTER 1-21
Page 1 and 2: The Art of Practical andPrecise Str
Page 3 and 4: 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
Page 13 and 14: CHAPTER 1Strain-BasedMeasurementInt
Page 15 and 16: Applications Note 1-1: Introduction
Page 17 and 18: Applications Note 1-1: Introduction
Page 19 and 20: Applications Note 1-2:The Art of Ap
Page 21 and 22: Applications Note 1-31. The presenc
Page 23 and 24: Applications Note 1-3result in a pe
Page 25 and 26: Applications Note 1-4:The measureme
Page 27 and 28: Applications Note 1-4:uncertainty i
Page 29 and 30: Applications Note 1-5:All strain-ba
Page 31: Applications Note 1-6:Applications
Page 35 and 36: Applications Note 1-6:and where:j i
Page 37 and 38: Applications Note 1-6:5. millivolts
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