Strain gauges are used amongst others to measure pressure. Figure 1 shows two strain gauges that are attached to a thin

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Strain Gauges Are Used Amongst Others To Measure Pressure Figure 1 Shows Two Strain Gauges That Are Attached To A Thin 1 (60.25 KiB) Viewed 34 times

Strain gauges are used amongst others to measure pressure. Figure 1 shows two strain gauges that are attached to a thin metal strip (E = 200-10° N/m²). The strain gauges are combined with two resistors with a fixed value into a complete bridge. When unloaded, each strain gauge has a resistance of 150 2. The fixed resistors also have a resistance of 150 2. The strain gauges have a gage factor of 2.50. To prevent damage to the strain gauges, the maximal current through them should be limited to 20 mA. active strain gauge (tension) Figure 1: Metal strip with two active strain gauges. The two strain gauges and the two fixed resistors are connected in a bridge circuit with a voltage supply Vr. The electrical equivalent circuit of this sensor is shown in Figure 2. R₁=Ro(1+x) R4 -OV₂0 R₂ R3=Ro(1+x) Figure 2: Bridge circuit with two strain gauges. I -V₂ 2+x (a) Show that the output voltage v, of the sensor circuit is equal to: (b) Does the sensor circuit shown in Figure 2 show a non-linear response when pressure is applied to the sensor? (Explain your answer) (c) What value should the voltage supply V, have to maximize the sensitivity of the sensor circuit shown in Figure 2 for a change in r? (d) Show that the output voltage v, of the sensor circuit shown in Figure 2 is equal to -4.7 mV when a pressure of 100. 106 N/m² is applied to the metal strip and V, = 7.5 V.
Digital inputs 0V or 5 V Vco V₂ O Vao- MSB ww 1k0 LSB ww 2k0 ww 4k0 8kQ 1k0 ww -ovo Figure 3: DA converter using summing op-amp. (e) A summing DA converter is shown in Figure 3. Which binary input has been applied to the DA converter if it has an output voltage u, of -3.1V? (f) Electromagnetic radiation with a wavelength between 400nm and 700nm with sufficient strength can be seen by our eyes as light. Light with a specific wavelength creates a specific color impression, but the reverse is not true, a specific color impression does not tell us which wavelength this light has. Explain why this is the case.