Basic knowledge of sensor and the common terms
1. The sensor can feel the provisions is measured and converted into usable output signal according to certain rules of device or devices. There are usually sensitive components and conversion components.
(1) sensitive element refers to a sensor that can be directly (or response) is measured.
(2) conversion element refers to the sensor can feel (or response) on the north side of the sensitive element quantity is converted to and transmission and electrical part of (or) measurement.
(3) when the output is prescribed standard signal, it is called a transducer.
2. The measuring range: within the allowed error limits the range of measured values.
3. Range: measuring the difference upper limit and lower limit the scope of algebra.
4. Accuracy: by measuring the degree of agreement between the measured results and the true value.
5. Repetitive: in all the following conditions, many times to the same measured the amount of continuous measurement results conform to the degree between:
The same measurement:
The same observer:
The same measuring instrument:
The same place:
The same conditions of use:
In a short period of repetition.
6. Resolution: the sensor in the specified measuring range circle could detect the smallest change of the measured quantity.
7. Threshold: can make the sensor output produces measurable changes in the smallest change of the measured quantity.
8. Zero: the absolute value of the output is the smallest state, such as balance.
9. Motivation: in order to make the normal work of the sensor and applying external energy (voltage or current).
10. The biggest motivation: under the condition of the city, can be applied to a maximum of the excitation voltage or current on the sensor.
11. Input impedance: when the output short circuit, sensor input end of the measured impedance.
12. Output: produce and plus be measured into a power function relationship.
13. Output impedance: when the input circuit, sensor output measured impedance.
