Functions of Intelligent Sensors
Functions of Intelligent Sensors
The function of intelligent sensor is proposed by comparing the coordinated action of human senses and brain. With the development of microelectronics and material science, sensors are more and more integrated with microprocessors in the process of development and application. They not only have vision, touch, hearing and taste, but also have artificial intelligence such as storage, thinking and logical judgment. Generally speaking, the main functions are as follows.
(1) Self-compensation and calculation
The self-compensation and calculation functions of intelligent sensors open up a new way for temperature drift and non-linear compensation of sensors. Even if the processing of the sensor is not too precise, as long as its repeatability can be guaranteed, more accurate measurement results can be obtained through the calculation function of the sensor. In addition, statistical processing can also be carried out to re-calibrate a sensitive element so that it can be re-validated.
(2) Self-diagnostic function
Intelligent sensors with microcontrollers also have advanced self-diagnostic functions, including two aspects: unreliable work caused by external environment conditions; performance degradation caused by internal faults of sensors. Its intuitive way of indication can continuously display the diagnosis results and working status. Regardless of internal and external factors, diagnostic information can make the system alarm before the failure occurs, thereby reducing system downtime and improving production efficiency.
(3) Compound Sensitive Function
Intelligent sensor can measure many kinds of physical and chemical quantities at the same time. It has complex sensitive function. It can give information reflecting the law of material change comprehensively, such as light intensity, wavelength, phase and polarization. It can reflect the movement characteristics of light. Pressure, vacuum, temperature gradient, heat and entropy, concentration and pH value reflect the mechanical, thermal and chemical properties of substances respectively.
(4) Powerful communication interface function
Because microprocessor is used to standardize its interface (such as SI4463 wireless transceiver module), it can standardize the interface with the upper microprocessor. The data extracted by the intelligent sensor is controlled by bus, which provides convenience for direct communication with other digital control instruments. The intelligent sensor can be controlled by the central computer as a component unit of the distributed control system.
(5) On-site learning function
Combining embedded intelligence with advanced programming characteristics, engineers have designed a new generation of sensors with learning function, which can quickly and conveniently set the best sensitivity for various occasions. The program design of learning mode enables photoelectric sensor to sample the detected process, calculate the threshold value of optical signal, automatically program the best settings, and automatically adjust its settings in the working process to compensate for changes in environmental conditions. This capability can compensate for the parameter drift caused by the aging of components, thus prolonging the service life of devices or devices and expanding their application scope.
(6) Providing analog and digital output
Many sensors with microprocessors can provide analog output, digital output or both through programming, and each has its own detection window. The latest smart sensors can provide two independent output channels with independent configuration device points.
(7) Function of numerical processing
Data are automatically processed according to internal programs, such as statistical processing, outlier value rejection, etc.
(8) Power-off protection function
Because the internal data of RAM of microprocessor will disappear automatically when power is off, it brings great inconvenience to use together. For this reason, the backup power supply is installed in the intelligent instrument. When the system is powered down, the backup power supply can be connected to RAM automatically to ensure that the data is not lost.