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《Transducer Sensor Excitation and Measurement Techniques》.pdf
Transducer/Sensor EXCITATION TECHNIQUES
Active transducers can be excited using a controlled current or
voltage. The choice between voltage and current excitation is
Excitation and generally at the discretion of the designer. In data-acquisition
systems, it is not uncommon to see constant-voltage excitation
Measurement used for strain and pressure sensors, while constant current
excitation is used to excite resistive sensors such as RTDs or
thermistors. In noisy industrial environments, current excitation
Techniques is generally preferable due to its better noise immunity.
AC or dc excitation sources can be used in transducer applications;
By Albert O’Grady
each offers advantages and disadvantages. The advantages
INTRODUCTION associated with dc excitation include simplicity of implementation
Input transducers, or sensors are classified as either active or passive. and low cost. The downside of dc excitation
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