Selection criteria of sensors for mechatronics system
SELECTION OF SENSORS
A number of static, dynamic and other factors must be considered in selecting suitable sensor to measure the desired physical parameter.
The following factors are considered while selecting sensors.
1. Accuracy required:
It is the difference between measured value and true value. Accuracy of the sensor should be as high as possible.
It is the ability to reproduce repeatedly with a given accuracy. It should be Very high. Error between sensed and actual values should approach zero.
It is the ratio of change in output to a unit change of the input. It should be chosen to allow sufficient output.
4. Operating range:
It is the difference between maximum and minimum value of the sensed parameter. Sensors should have wide operating range and good accuracy over the range.
It is the smallest change in the sensor which can differentiate. Sensors should have high resolution.
6. Speed response:
Time taken by the sensor to respond should be minimum. Response time should be very less.
Reliability of the sensor should be high. Mean time to failure (MTTF) should be high. It results the increased life.
8. Maintenance should also be easy and frequency of maintenance required should be less over the period.
Sensors need frequent calibration for many reasons. Hence, it should be easy to calibrate. Drift should be as minimum as possible.
Cost of the sensor should be low.
11. The nature of output required from the sensor whether the digital or analog has to be considered while selecting a sensor.
Sensor’s curve should linear. The percentage of deviation from the best-fit linear calibration curve should be less.
13. Environmental conditions:
Sensors should operate over wide environmental conditions such as temperature, corrosion, pressure, shocks etc.
Sensors should be compatible with different instruments for interfacing.
15. Size and weight:
Sensors should have small size and less weight.
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