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Strain-Based Measurement Introduction:Hydraulic Impulse:The hydraulic impulse systems in common use involve the dropping ofa calibrated weight from a controlled height onto a moveable precisionpiston which compresses a column of hydraulic fluid. Two forms ofthis calibrator are in use; one utilizes a reference pressure sensor usuallyof the tourmaline piezoelectric type; the other computes the generatedpressure based upon the mass of the weight, local gravity, velocity,and piston area. Peak pressure magnitudes of between 100 and 20,000psi are achievable with rise times on the order of 3 milliseconds andshowing pulse durations on the order of 6 milliseconds.FIGURE 1-18. The Hydraulic Impulse Test System:Drop Tube9-lb massImpact Pad:Modifies Pulse durationPistonTypical Range:0 to 20,000 psiRise Time:3 millisecondsPulse Duration:6-8 millisecondsTest sensor Reference Sensor(Piezoelectric tourmaline)Hydraulic ReservoirOther Methods:Other methods, not so commonly used for the determination of thedynamic response of sensors, are many and varied. Modified air com-CHAPTER 1-38 The Art of Practical and Precise Strain Based Measurement 2nd Edition © 1999
Applications Note 1-6:pressors (Figure 1-19) can be used to generate repeatable sinusoidal pressurewaves where the test pressure sensor output is compared with outputof a reference sensor. The modified air compressor method is typicallyused at a fixed frequency depending upon the design of the compressormotor.The vibrating fluidic-column method (Figure 1-20) is also based upon thecomparison of outputs between a reference sensor and the sensor undertest. This method involves the use of a fluidic column that supports amoveable piston/mass that is then mounted to an electrodynamic shakersystem and is driven to vibrate at a selection of frequencies.FIGURE 1-19. The Sinusoidal Pressure Source:Pressure sensorunder testPressure Relief ValvePressure Transfer StandardCompressorFIGURE 1-20. The Hydraulic-Column Pressure Source:Free MassSensor underTestHydraulic columnPressure TransferStandardShakerThe Art of Practical and Precise Strain Based Measurement 2nd Edition © 1999 CHAPTER 1-39
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 and 32: Applications Note 1-6:Applications
Page 33 and 34: Applications Note 1-6:ical size of
Page 35 and 36: Applications Note 1-6:and where:j i
Page 37 and 38: Applications Note 1-6:5. millivolts
Page 39: Applications Note 1-6:.Electrodynam
Page 44 and 45: Strain-Based Measurement Introducti
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Strain-Based Measurement Introducti
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