Smart sensors can store the detected various physical quantities and process these data as instructions to create new data.Information exchanges can be performed between intelligent sensors, and the data that should be transmitted by themselves can be self -decided, abandoning abnormal data, and completing analysis and statistical calculations.So what are the functions of smart sensors? What are the characteristics?
Smart sensor function
(1) Have the function of zero school, self -calibration, and self -correction;
(2) Have automatic compensation function;
(3) The data can be automatically collected and the data is pre -processed;
(4) Can be automatically tested, self -selected, and failed to find themselves;
(5) Have data storage, memory and information processing functions;
(6) Have two -way communication, standardized digital output or symbol output function;
(7) Have the function of judgment and decision -making.
Smart sensor characteristics
1. Improve the accuracy of the sensor
Intelligent sensors have information processing functions. Through software, not only can various certainty system errors (such as non -linear errors, service errors, zero -point errors, positive and negative stroke errors, etc.) can also be appropriately compensated to randomly compensate randomlyErrors and reducing noise have greatly improved the accuracy of sensor.
2. Improve the reliability of the sensor
Integrated sensor system miniaturization, eliminating some unreliable factors of the traditional structure, and improving the anti -interference components of the entire system; at the same time, it also has diagnosis, calibration, and data storage functions (for intelligent structure systems and adaptive functions), which has it has it, which has it. It has it to have it.Good stability.
3. Improve the performance ratio of the sensor
Under the requirements of the same accuracy, the performance price ratio is significantly improved compared to ordinary sensors with single -function, especially after using cheaper single -chip machines.
4. Promote the multifunctionalization of the sensor
Intelligent sensors can achieve multi -sensor and multi -parameter comprehensive measurement, which can expand the measurement and use scope by programming; have a certain adaptive ability, according to the changes in the detection object or conditions, change the form of the counter -output data accordingly; it has digital communication interface functions, Directly send it into a remote computer for processing; have a variety of data output forms (such as RS232 serial input, PIO parallel output, IEE-488 bus output, and simulation output after D/A conversion), adapting to each adaptation eachSpecies application system.
Precautions for smart sensors
1. Generally, the measured physical quantity is very small, and usually with the inherent conversion noise inherent as a sensor physical conversion element.For example, the signal strength of the sensor at a magnifying rate of 1 is 0.1 ~ 1UV. At this time, the background noise signal also has such a large level, and even annihilated it.How to take out the useful signal and lower noise is the primary problem of sensor design.
2. The sensor circuit must be simple and refined.Imagine a magnifying circuit with a level 3 amplifier circuit with a level 2 active filter. It also enlarges the signal while magnifying the noise. If the noise is not obviously deviated from the useful signal spectrum, the filtering is magnified at the same time.The signal -to -noise ratio has not improved.Therefore, the sensor circuit must be refined and simple.It must be removed by saving 1 resistor or capacitor.This is a problem that many engineers who design sensors are easy to ignore.The known situation is that the sensor circuit is troubled with the problem of noise, the more modified the circuit is, and it becomes a strange circle.
3. Power consumption.The sensor is usually at the front end of the subsequent circuit, and it may require a longer lead connection.When the sensor consumes a large power consumption, the connection of the lead will be all unnecessary noise and the introduction of power noise, making it increasingly difficult to design the follow -up circuit.It is also a great test to reduce power consumption in enough situations.
4. Selection and power circuit of components.The selection of components must be enough. As long as the device indicator is within the required range, the rest is the problem of circuit design.Power supply is a problem that the sensor circuit design process must be encountered. Do not pursue the unreasonable power index. Choose an op amp with a good co -mode suppression ratio.Device can meet your requirements.The power of the power supply must be reliable, and follow the requirements of the device manual.

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