The concept of a detection system is a product of the development of sensing technology to a certain stage. The detection system is an organic combination of sensors and measuring instruments, conversion devices, and the like.
In the actual project, it is necessary to have a sensor and a plurality of measuring instruments organically combined to form a whole, in order to complete the signal detection, thus forming a detection system. With the continuous development of computer technology and information processing technology, the content involved in the detection system has been continuously enriched. In the modern production process, the detection of process parameters is carried out automatically, that is, the inspection task is automatically completed by the inspection system, so it is necessary to study and master the composition and principle of the detection system.
A sensor in the system is a device or device that senses the measured magnitude and outputs a corresponding available output signal. The data transmission link is used to transmit data. When several functional links of the detection system are separated independently, data must be transmitted from one location to another, and the data transmission link is to complete the transmission function. 
The data processing process is to process and transform the output signal of the sensor. Such as amplification, calculation, filtering, linearization, digital-to-analog (D/A) or analog-to-digital (D/A) conversion of signals, conversion to another parameter signal or some standardized unified signal, etc., to make the output signal It is easy to display, record, or connected to a computer system for information processing of measurement signals or for automatic control of the system. The data display link turns the measured information into a form of human sensibility acceptance for monitoring, control or analysis purposes. The measurement results can be either analog or digital, and can be automatically recorded by the recording device or printed by the printer.
The purpose of the measurement is to obtain the measured true value by measurement. However, in the actual measurement process, for various reasons, for example, the performance of the sensor itself is not ideal, the measurement method is imperfect, the external interference is affected, and the human negligence will cause the measured value of the measured parameter to be inconsistent with the true value. The degree is expressed by the measurement error.
The error is the difference between the measured value and the true value, which reflects the accuracy of the measurement.
With the development of science and technology, people have higher and higher requirements for measurement accuracy. It can be said that the value of measurement work depends on the accuracy of measurement. When the measurement error exceeds a certain limit, the measurement work and the measurement result lose meaning, and even cause harm to the work. Therefore, the analysis and control of measurement error becomes an important aspect to measure the level of measurement technology and even the level of science and technology. However, due to the inevitability and universality of the error, one can only control the error as small as possible, and cannot completely eliminate it.
On the other hand, the reliability of measurement is also crucial. Different systems and different systems have different requirements for the reliability of measurement results. For example, when the measured value is used as a control signal, attention should be paid to the stability and reliability of the measurement. Therefore, the performance indicators such as measurement accuracy and reliability must be related to the specific measurement purposes and requirements. The function and features of the sensor can be better played out!
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