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lesson22 - Lesson 22 Op-Amps#7(Section 4-6(CLO 4-3 This...

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Lesson 22 – Op-Amps #7 (Section 4-6) (CLO 4-3) This last lesson on Op-Amps focuses on designing Instrumentation Systems with passive transducers. Input Transducer Output Transducer K Gain Bias, b + + As mentioned previously, passive transducers require an external source to produce a voltage or current that is proportional to the physical parameter being measured. Photo-resistors, thermistors, strain gages, and rotation sensors are but a few of the passive transducers that use a variance in resistance to sense a physical parameter. There are two ways to apply an external source to a passive transducer. The first is using a simple voltage divider. This technique is useful when the accuracy of the sensor is not too critical and the change in parameter value is significant, such as photo-resistors, thermistors, or rotational devices, such as potentiometers. The second approach is to use a bridge circuit. This technique allows for a very precise measurement of small changes in parameter values, such as those created by strain gages.
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