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SB series semi-conductor strain gage based on piezoresistive effect is made from p-type doped silion wafer,It is ideal component for linear compensation of transducers with column or similar structure. with characters of high sensitivity coefficient, low mechanical hysteresis, broad resistance range and small transverse effect, etc.
II. Linear compensation principle
Due to the unbalance of transverse(Poisson Strain) and axial strain of the column for similar structure transducers element, caused the non-linearity error of the bridge output. and because of the non-linearity between load and strain, material non-linearity, transverse load non-linearity error, severely affect the accuracy of column and similar structure transducers, there we must correct it to meet the requirement of producing high precision transducers.
Non-linear compensation could practice compensation through changing the actual supply voltage of the bridge to compensate transducer linear accuracy.
Generally,in the strain area of the column spring element, on the side of strain gage we just bond two pieces of semi-conductor gages symmetrically along with the axle. as for linear compensation resistance PL.picture 5 shows the bonding area of compensation resistance;connect two pieces of resistance with value of RL/2 symmetrically to the supply bridge.Picture 6 shows the linear compensation bridge and complete bridge circuit.
As we all know, non-linear error of column and similar structure is a degressive parabola. Namely, as the increase of load, output will present degressive trend.After linear compensation, degressive output and increased supply voltage will compensate to each other. therefore the real output will be a straight line.
Grid Dim.(mm) Resistance(Ω) Gage Factor TCR(/℃) TC of Gage
Max Operating Temp.(℃) Operating Current
SB5-15-P-2 6x4 5x0.32x0.05 15 80±5% ＜0.06% <0.10% <80 20 6000 SB5-25-P-2 6x4 5x0.32x0.05 15 80±5% ＜0.06% <0.10% <80 20 6000 SB5-30-P-2 6x4 5x0.32x0.05 30 80±5% ＜0.06% <0.10% <80 20 6000 SB5-60-P-2 6x4 5x0.32x0.05 60 100±5% ＜0.08% <0.12% <80 15 6000 SB5-120-P-2 6x4 5x0.32x0.05 120 110±5% ＜0.15% <0.15% <80 15 6000 SB3.8-15-P-2 5x3 3.8x0.24x0.05 15 80±5% ＜0.06% <0.10% <80 20 6000 SB3.8-30-P-2 5x3 3.8x0.24x0.05 30 80±5% ＜0.06% <0.10% <80 20 6000 SB3.8-60-P-2 5x3 3.8x0.24x0.05 60 100±5% ＜0.08% <0.12% <80 15 6000 SB3.8-120-P-2 5x3 3.8x0.24x0.05 120 110±5% ＜0.15% <0.15% <80 15 6000