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A lateral force sensor with preamplifier


Conditions, with a fixed output voltage range of the differential input preamplifier,[link widoczny dla zalogowanych], and its performance is analyzed. Keywords sensitivity of force sensor pre-amplifier 1 Introduction magnification force pre-amplifier is an important component of electronic circuits, and its main role is to force the sensor output signal for denoising and amplification. Pre-amplifier and nonlinear drift error directly affects the quality indicators such as force measurement instrument measurement accuracy. In general, the main technical requirements of the preamplifier are: zero-drift and nonlinearity error is small, high sensitivity, high overload capability, small output resistance, input resistance of large load capacity and strong. Force for the common sensor circuit, the following is proposed and the supporting force sensors, the sensitivity was lmV / V, 2mV / V, 3mV / V conditions, with a fixed output voltage range of the pre-amplifier, and its a simple analysis. 2 circuit design and analysis of circuit shown in Figure l, the circuit for the differential input amplification circuit, were connected to the force sensor output is the output of the amplifier, the reference voltage signal. Magnification to ensure the stability of the circuit, the amplifier circuit with a fixed resistor network to change the amplifier's sensitivity and magnification. The circuit in Figure l, l feet and 2 feet will be connected, the amplifier's sensitivity 1mV / V: will be 1 foot and 3 feet connect, - '48. 'Figure l total preamplifier sensitivity of the amplifier circuit R63k3l4 2mWV; to l foot and 4 feet (empty legs) connected, the amplifier's sensitivity 3mV / V. In relation to the circuit analysis of three different connection methods are as follows. 2.1 sensitivity 1mv / V amplifier connected in the circuit in Figure l l feet and 2 feet connected to the equivalent circuit connection shown in Figure 2. The circuit in Figure 2, set the magnification of l. Is on the R2, R3, R5 resistor feedback network consisting of equivalent transformation, the equivalent results as shown in Figure 3, Figure 4 shows, at which RA = R = Rc = (750 × 750) + (3 × 750) = 250Q. According to the characteristics of an integrated operational amplifier with h = o, Si = 0, so come = Si, Si = Si,[link widoczny dla zalogowanych], and thus have to -. --++- L00250Q250Q100kQ simultaneous from the last two equations obtained: = A 401 (S + one by one) +, the voltage amplification factor Kvl = 40l, output and inverting input. Figure 2 Sensitivity lmV / V VS Figure 3 when the circuit sensitivity ImV / V on the equivalent circuit network 2, 2003 the total of Acoustic and Electronic Engineering,[link widoczny dla zalogowanych], No. 70 Figure 4 Sensitivity IVm / V 2.2 when the sensitivity of the equivalent circuit to 2mV / V amplifier connected in the circuit shown in Figure l l feet and 3 feet connected to the equivalent circuit connection shown in Figure 5. In Figure 5, set the magnification of the above analysis, first 2,3, and the wind resistance of the feedback network consisting of the equivalent, the equivalent circuit shown in Figure 6. Therefore, can be obtained Vo =-- 20l (eleven) + K-, Kv2 ----- 201. Output, input reverse. Figure 5 Sensitivity 2mV / V sensitivity when the circuit diagram in Figure 6 2mV / V equivalent circuit of Figure 7, when the sensitivity 3mV / V when the circuit sensitivity of 2.3 3mV / V amplifier connected in the circuit shown in Figure l l foot and 4-pin connected, the connection of the equivalent circuit shown in Figure 7. Magnification the amplifier set to 3, 7 can be obtained by the equivalent circuit, Vo = a l34.3 (eleven) +, Kv3 = l34.3 output, inverting input. 3 Conclusions from the above analysis,[link widoczny dla zalogowanych], when the sensitivity were lmV / V, 2mV / V and 3mV / V, the proposed force sensor resistance strain magnification with a pre-amplifier were 401,20 l and l34.3, corresponding output ranges were 40lmV / V, 402mV / V and 403.9mV / V. The circuit can also adjust the resistor feedback network so that the sensor amplifier sensitivity of the different, the output range is more consistent. 【Reference】 I Ruilao l. Sensors. Second Edition. Beijing: Aviation Industry Press, l995 【2】 Arthur Hou edited. Testing and sensing technology. Harbin: Harbin Institute of Technology Press. 【3】 fee 1998 Thai industry. Error Theory and Data Processing. Fourth Edition. Beijing: Mechanical Industry Press, 2001 【4】 Yuan Xiguang. Sensor Technology Handbook. Beijing: National Defence Industry Press, l989-・ 49 -

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