Design andimplementation ofaSmartStrain GageConditioner

Thispaper presents anewdesign andimplementation ofasystem onaprogrammable chip (SOPC) forsmart strain gageconditioner. Thesystem isdesigned tomeetflexibility andcomplex computations required inthermal compensation algorithms ofstrain gage.To satisfy thereal-time processing constraints inonehand, and parameterization inanother hand, parts ofthealgorithms areimplemented inhardware andothers areimplemented in software. Theses architectures areimplemented onaField Programmable GateArray(FPGA)including acore processor. Fivemethodologies aredeveloped forthethermal compensation. Thefirst istheclassical technique usually used. Thesecond isbased onLagrange interpolation. Thethird isbased ontheNewton iteration algorithm. Thefourth isbased onNeville-Aitken recurrence algorithm. Thelast isbased ontheSpline interpolation algorithm. Implantations Techniques andexperimental results aregiven. IIntroduction Forstrain gage, thermal compensation isnecessary [1]. Itshould benoted that thermal output depends notonly onthe nature ofstrain gage, butalso onthematerial towhich thegageisbonded. Theneedforcalibration ofstrain gage based sensors arises frequently. Recurring calibration isrequired toassure theaccuracy andlinearity ofthesystem itself. Moreoften, calibration andthermal compensation isnecessary toscale thesystem sensitivity inorder that the output correspond conveniently andaccurately tosomepredetermined input.