Dynamic Characteristics Of Transducers

Wednesday, November 29th, 2017 - Transducer/Sensor

Dynamic Characteristics of Transducers

Dynamic characteristics relate the response of the device to variations of the measurand with respect to time. The most important ones are the frequency­ and step-response characteristics.

Frequency Response of Transducer

Frequency response-can be defined as the variations in the output curve given a sinusoidally varying, constant amplitude, input measurand, see Figure 1.9. Please note that the output is normally shown as a ratio of the output amplitude divided by measurand amplitude, expressed in percentage.

Step Response Of Transducers

Step response-can be defined as the variation in the output value given a step change in the input measurand value. The time required for the output to reach a specified percentage of the final value is termed the ‘response time’. These specified percentages are usually 10% and 90% of the final value.

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As shown in Figure 1.10 there are four main types of response time:

  • Delay time-the time taken for the output to rise to 10% of the final value once the input step has been applied.
  • Rise time-the time taken for the output to rise from 10% to 90% of the final value.
  • Storage time-the time taken for the output to fall to 90% of the final value once the input step has been removed.
  • Fall time-the time taken for the output to fall from 90% to 10% of the final value.

Other important elements of the output characteristic are noise and noise margins, which can be defined as:

Noise-the level of any spurious signal(s) appearing at the output of the device due to any cause other than the driving input physical quantity.

Noise margin-the maximum noise level that can be tolerated by the device before it has any significant effect on the output signal.

I hope this information about “Dynamic Characteristics Of Transducers” is easy to be understood.