Sensor Intelligence

The function of smart sensors is proposed by simulating the coordinated actions of human senses and brain, combined with long-term research and practical experience in testing technology. It is a relatively independent intelligent unit. Its appearance has alleviated the original demanding requirements for hardware performance, and the performance of sensors can be greatly improved with the help of software.
1. Information storage and transmission-With the rapid development of the fully intelligent distributed control system (SmartDistributedSystem), the intelligent unit is required to have communication functions, and use the communication network to carry out two-way communication in digital form, which is also one of the key signs of smart sensors. Smart sensors realize various functions by transmitting test data or receiving instructions. Such as gain setting, compensation parameter setting, internal inspection parameter setting, test data output, etc.
2. Self-compensation and calculation function-For many years, engineers and technicians engaged in sensor development have been doing a lot of compensation work for temperature drift and output nonlinearity of sensors, but they have not fundamentally solved the problem. The self-compensation and calculation functions of smart sensors have opened up a new path for temperature drift and nonlinear compensation of sensors. In this way, the requirements for sensor processing precision are relaxed. As long as the repeatability of the sensor is good, the microprocessor is used to calculate the test signal through software, and multiple fitting and difference calculation methods are used to compensate for drift and nonlinearity, so as to obtain more accurate measurement results. Pressure sensor.
3. Self-test, self-calibration, and self-diagnosis functions-ordinary sensors need to be regularly inspected and calibrated to ensure that they are accurate enough in normal use. These tasks generally require the sensor to be disassembled from the site of use and sent to the laboratory or inspection department for execution. For online measurement sensors, abnormalities cannot be diagnosed in time. The use of intelligent sensors has greatly improved the situation. First, the self-diagnosis function performs self-test when the power is turned on, and the diagnostic test determines whether the component is faulty. Secondly, it can be corrected online according to the use time, and the microprocessor uses the metrological characteristic data stored in the EPROM for comparison and calibration.
4. Composite sensitive function-observe the natural phenomena around, and common signals include sound, light, electricity, heat, force, chemistry, etc. Sensitive element measurements are generally measured in two ways: direct and indirect measurement. Intelligent sensors have composite functions and can measure multiple physical and chemical quantities at the same time, giving information that can more comprehensively reflect the laws of material movement.
Photosensitivity
Photosensors are one of the most common sensors. There are many types of them, including: phototubes, photomultiplier tubes, photoresistors, phototransistors, solar cells, infrared sensors, ultraviolet sensors, fiber-optic photoelectric sensors, color sensors, CCD and CMOS image sensors, etc. Its sensitive wavelength is near the wavelength of visible light, including infrared wavelengths and ultraviolet wavelengths. Photosensors are not limited to the detection of light. They can also be used as detection elements to form other sensors and detect many non-electrical quantities, as long as these non-electrical quantities are converted into changes in light signals. Photosensors are one of the most produced and widely used sensors. They play a very important role in automatic control and non-electrical quantity measurement technology. The simplest photosensor is a photoresistor, which generates current when photons hit the junction.