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6.7 Force sensor. A force sensor is made of a strip of steel with cross-sectional area of a = 40 mm by b= 10 mm with a platinum, 350 2 strain gauge (nominal, unstressed resistance) bonded to one surface, as shown in Figure 6.46. The sensor is intended for use as a compression force sensor. a. Given the modulus of elasticity of 200 GPa, calculate the range of resistance of the sensor if it cannot exceed a strain of 3%. What is the range of forces that can be applied? b. Calculate the sensitivity of the sensor assuming it is prestressed to 3%. F ce R. 350 2

6.7 Force sensor. A force sensor is made of a strip of steel with cross-sectional area of a = 40 mm by b= 10 mm with a platinum, 350 2 strain gauge (nominal, unstressed resistance) bonded to one surface, as shown in Figure 6.46. The sensor is intended for use as a compression force sensor. a. Given the modulus of elasticity of 200 GPa, calculate the range of resistance of the sensor if it cannot exceed a strain of 3%. What is the range of forces that can be applied? b. Calculate the sensitivity of the sensor assuming it is prestressed to 3%. F ce R. 350 2

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6.7 Force sensor. A force sensor is made of a strip of steel with cross-sectional area of a = 40 mm by b= 10 mm with a platinum, 350 2 strain gauge (nominal, unstressed resistance) bonded to one surface, as shown in Figure 6.46. The sensor is intended for use as a compression force sensor. a. Given the modulus of elasticity of 200 GPa, calculate the range of resistance of the sensor if it cannot exceed a strain of 3%. What is the range of forces that can be applied? b. Calculate the sensitivity of the sensor assuming it is prestressed to 3%. FIGURE 6.46 A simple compression force F sensor. R=350 2 a
Transcribed Image Text:6.7 Force sensor. A force sensor is made of a strip of steel with cross-sectional area of a = 40 mm by b= 10 mm with a platinum, 350 2 strain gauge (nominal, unstressed resistance) bonded to one surface, as shown in Figure 6.46. The sensor is intended for use as a compression force sensor. a. Given the modulus of elasticity of 200 GPa, calculate the range of resistance of the sensor if it cannot exceed a strain of 3%. What is the range of forces that can be applied? b. Calculate the sensitivity of the sensor assuming it is prestressed to 3%. FIGURE 6.46 A simple compression force F sensor. R=350 2 a
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