Sensor, generally composed of sensitive components and conversion components, is a can feel have rules can be measured and according to certain rules can be converted into a signal of the device or devices that can be used. Such as temperature and humidity sensor, it can be felt by measuring the temperature and humidity information, and the test information, converted to electrical signals according to certain rules or other forms of signal and output to, to meet the information processing, transmission, record or control requirement, so it is used to detect the signal device and can realize automatic control and automatic detection of important link.

The characteristics of the sensor has a lot of:

Linearity aspect

In fact most of the time, the static characteristic of sensor output is not a straight line but a curve. But in practice, in order to make the output of the instrument is evener, generally with the fitting line close to represent, in fact, the characteristic curve of, a performance index of the linearity. To select fitting line method also has a lot of kinds, such as the characteristic curve of each point on the poor as the minimum square sum of the theory of linear fitting line, this is the least squares fitting a straight line, and the zero input with full range of the output point together, so the theory of linear also can do the fitting line.

Static features

Static characteristic of sensor is the behaviors of the input signal, between its input and output has a certain relationship. At this time of the input and output has nothing to do with the time, so the relationship between them, that is to say the static characteristic of sensor can be used not contain the algebraic equation of the variables of time. Such as temperature and humidity of input as the abscissa, with its corresponding output as the ordinate of temperature and humidity to describe a characteristic curve. And characterization parameters of static characteristic of sensor sensitivity, repeatability, linearity, hysteresis and drift, and so on.

Dynamic properties of

Sensor's dynamic characteristic is refers to the input of the sensor changes, it corresponds to the characteristics of the output information. In general practice, the dynamic characteristic of the sensor is generally to some standard signal input, the response said. Because this time, the sensor response to these standard input signals can be simple and easy to use the method of experiment to obtain, and its response to the standard input signal with its response to any input signal is certain corresponding relationship between, and generally know the signal in front of the general presumption can be at the back of the signal. Sine signal and step signal is more frequently used standard input signal, so the frequency response and step response often used as a sensor of characterization of the dynamic characteristics.

resolution

Sensor is refers to the resolution of the sensor can be felt by measuring of the capability of the smallest change of the object. Like temperature and humidity sensor, if the temperature and humidity of the object under test from a numerical changes slowly, is not zero when the input changes in values and no more than a certain value, the output of the sensor is not going to happen any changes, that is to say, at this time of the temperature and humidity sensor to the change of the input fundamental resolution not to come out. If the input amount of change exceeds a certain value, the output will change. The stability of the sensor and resolution has a negative correlation.

sensitivity

The sensitivity of the sensor is refers to under the condition of the steady work, the change of the sensor's output quantity and the ratio of input amount of variation. So it is output to input the characteristic curve of the slope. To improve the sensitivity of the sensor, can get high accuracy of measurement. But if the sensitivity is high, the more narrow the scope of its measurement, causes the stability will become worse.