The function of the smart sensor is proposed by simulating the coordinated actions of the human senses and the brain, combined with the research and practical experience of long-term testing techniques. It is a relatively independent intelligent unit, its appearance has reduced the requirements of the original hardware performance, and software help can greatly improve the performance of the sensor.
1. Information storage and transmission - With the rapid development of the SmartDistributed System, the intelligent unit is required to have a communication function, and the communication network is used for digital communication in two-way communication, which is one of the key symbols of the smart sensor. Smart sensors implement functions by testing data transmission or receiving instructions. Such as gain setting, compensation parameter setting, internal detection parameter setting, test data output, etc.
2, self-compensation and calculation function - engineering and technical personnel engaged in sensor development for many years has been doing a lot of compensation for the temperature drift and output nonlinearity of the sensor, but they have not fundamentally solved the problem. The self-compensation and calculation functions of smart sensors open up a new path for temperature drift and nonlinear compensation of sensors. In this way, the precision of the processing precision of the sensor is relaxed, as long as the repeatability of the sensor is ensured, the signal of the test is calculated by the microprocessor through software, and the drift and nonlinearity are compensated by multiple fitting and difference calculation methods, thereby enabling Get a more accurate measurement of the pressure sensor.
3, self-test, self-calibration, self-diagnosis function - ordinary sensors need regular inspection and calibration to ensure that it is accurate enough in normal use, these tasks generally require the sensor to be removed from the use site to the laboratory or inspection department get on. If the online measurement sensor is abnormal, it cannot be diagnosed in time. The use of smart sensors has changed a lot. First, the self-diagnosis function performs a self-test when the power is turned on, and a diagnostic test determines whether the component is faulty. Secondly, according to the use time, the calibration can be performed online, and the microprocessor uses the measurement characteristic data in the EPROM for comparison and proofreading.
4, composite sensitive function - observe the natural phenomenon around, common signals are sound, light, electricity, heat, force, chemistry and so on. Sensitive component measurements are generally made in two ways: direct and indirect. The smart sensor has a composite function, which can measure a variety of physical quantities and chemical quantities at the same time, and gives information that can comprehensively reflect the motion law of the substance.
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