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Strain-Based Measurement Introduction:make the difference between success and failure in measurement. Piezoresistivesensors, by a large margin, are manufactured in greater quantities for dedicatedvehicular use than all other strain-based sensors combined. For thisreason, the piezoresistive-based sensor is a primary focus of discussion.This book is organized as a reference manual containing a selection of ÒApplicationsNotesÓ that pertain to specific sensor parameters, considerations, mediaconcerns, lead-wire considerations, and a host of others. You are encouraged toreview the Introductory section to lay a firm foundation for the applicationnotes that follow.Sensors are epidemically misapplied to various measurements. In some situationsit is the fact that the engineer has achieved a Òcomfort levelÓ in the use ofa particular sensor technology and is unwilling to risk the use of a potentiallymore-appropriate technology. Knowledge of other technologies is the key thatunlocks the door to move beyond the comfort zone. In other instances, it issimply ignorance of the intricacies of the sensor that lead to the Òround peg inthe square holeÓ situations that occur frequently in measurement.Why are there hundreds of different sensor types commercially available? Simply,each sensor type is appropriate for use in specific environments and is lesswell-suited for use in others. Each measurement environment is unique andoften ÒgreyÓ areas are encountered where the performance of the sensor is notwell-defined by the manufacturerÕs specifications. This book breaks with traditionin attempting to define attributes of the sensor that the reader can utilize toqualify a sensor geometry and performance for the measurement environmentthat he or she faces.I firmly believe that any reader, who has been Òdown in the trenchesÓ makingreal-world measurements, will find some gems contained herein that have beenÒGotchasÓ in prior measurement efforts. As oneÕs experience level grows in thefield of measurement, it becomes clear that no ÒminusculeÓ errors exist. Thecomplete treatment of sensor error components may seem to dwell upon smallerror contributors yet, all too often, engineers find themselves in a court-of-lawarguing over ÒminuteÓ errors that, due to the nature of the measurement, havebecome major error drivers. In short, the Òminute errorÓ can, all too easily,CHAPTER 1-4 The Art of Practical and Precise Strain Based Measurement 2nd Edition © 1999
Applications Note 1-1: Introductionbecome the bone of contention when a major program has been delayed or expensiveretesting must be conducted due to poor-quality data.In closing, I would leave you with the thought that, the instrumentation engineer isperhaps one of the worldÕs great unsung heroes when one considers that all that weknow of materials, our bodies, our universe, subatomic as well as chemical andmacroscopic phenomena, we have learned through the science of observation andmeasurement. The human biological sensor system, including our senses of sight,smell, touch, temperature sensitivity, sound, and the like, functions as a group oftransducers providing information to us about our world. In instrument engineering,separate sensors, specifically fabricated to be sensitive to one or another phenomenon,are used to provide information to us concerning the inner workings ofour creations, whether they be machines or processes. In summary, the knowledgethat we possess about our world is provided to us by observation and measurementwhere the validity of this knowledge is dependent upon the quality of the observationor measurement.I sincerely hope that the you will enjoy this work as much as I have enjoyed creatingit.James PiersonPierson Associates IncorporatedFirst Edition: 19922nd Edition: September 1999The Art of Practical and Precise Strain Based Measurement 2nd Edition © 1999 CHAPTER 1-5
Page 1 and 2: The Art of Practical andPrecise Str
Page 3 and 4: Special Credits:Mrs. Helen Pierson,
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