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Sensors basic knowledge and terms

Author: Date:2011-9-23 23:17:01
Key words: sensor knowledge, sensor principle, transducer knowledge, transducer principle, linear transmitter 

Sensor(transducer, transmitter): can feel the requirements are measured and converted in accordance with the laws of certain output signals available devices or device. Usually sensitive components and conversion components.
 
① sensitive sensor element is directly (or response) is measured in part.
② conversion element refers to the sensor elements can be more sensitive feelings (or response) into the north side is the amount of transmission and (or) part of the measurement signal.
③ When the output signal for the required standards, then known as the transmitter.
  
2. Measuring range: within the permissible error limit of the measured values.
 
3. Range: measuring range upper limit and lower limit of the algebraic difference.

4. Accuracy: the measurement results to be measured and the degree of agreement between the true value.

5. Repeatability: In all the following conditions, the same test several times the amount of continuous measurement of the degree of conformity between the results obtained:

The same methods of measurement:

The same observer:

The same measuring instruments:

The same locations:

The same conditions of use:

Repeated in a short time.

6. Resolution: The sensor provides measurement range in a round may be detected by measuring the smallest variation.

7. Threshold value: the sensor output can produce measurable changes in the minimum amount of variation is measured.

8. Zero: the absolute value of the output is the smallest state, such as balance.

9. Incentives: To enable the sensor to work properly applied external energy (voltage or current).

10. Maximum Incentive: conditions in the city can be applied to the sensor excitation voltage or current of maximum value.

11. Input Impedance: The output short-circuit, the sensor input of the end of the measured impedance.

12. Output: a sensor to be produced and measured as a function of applied power.

13. Output impedance: the input circuit, the sensor output measured impedance.

14. Zero output: conditions in the city, the increase was measured when the sensor output to zero.

15. Hysteresis: in the specified range, when the measured value increases and decreases, the maximum difference appears in the output.

16. Lateness: the output signal change relative to the input signal changes in time delay.

17. Drift: in a certain time interval, independent of the sensor output was finally measured the amount of unwanted changes.

18. Zero drift: in the time interval and zero output under laboratory conditions change.

19. Sensitivity: The sensor output increment and the corresponding ratio of input to Increment.

20. Sensitivity drift: changes in the sensitivity caused by changes in the slope of the calibration curve.

21. Thermal sensitivity shift: changes in sensitivity caused by the sensitivity of drift.

22. Drift: As the ambient temperature changes caused by zero drift.

23. Linearity: The calibration curve consistent with a specified level only.

24. Philippine linearity: linear calibration curve with a specified degree of deviation.

25. Long-term stability: The sensor can keep within the time prescribed does not exceed the capacity of tolerance.

26. Inherent virtue rate: in the absence of resistance, the sensor of the free (without force) by rate of oscillation.

27. Response: Change the output characteristics are measured.

28. Compensation temperature range: the sensor range and regulations to maintain a zero balance within the limits of the compensation temperature range.

29. Creep: When the machine is measured more than a constant environmental conditions, the output within the specified time changes.

30. Insulation resistance: If no other requirements, refer to the imposition of requirements at room temperature, DC voltage, from the sensor provides insulation resistance between the measured values.