Smart sensors have composite sensing functions, allowing them to simultaneously measure multiple physical and chemical quantities. They can perform self-compensation and computing to address issues like temperature drift and nonlinearity. Smart sensors also have self-checking, self-correcting, self-compensation, and self-diagnosis functions. They can store and transmit test data and receive instructions to perform various functions via communication networks.

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The Function of Smart Sensor
At present, the international sensor field has been formed basic consensus to the definition of smart sensor. Smart sensor is a
device has one or more sensitive functions that can perform signal detection and transform processing, logical judgment,
functional calculation, two-way communication, and its internal can realize the function of self-checking, self-correcting,
self-compensation, and self-diagnosis.
The function of intelligent sensor is brought out through simulating human senses and brain coordination action, combining the
long-term research and the actual test technology experience. It is a relatively independent intelligence unit and its appearance
lightened the strict requirements to the original hardware performance, and improved sensor performance greatly.
Composite sensitive functions
We observe the surrounding natural phenomenon; common signals are sound, light, electricity, heat, power, chemical, etc.
Sensitive elements measurement generally by two ways: direct and indirect measurement. However, smart sensor possesses
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composite function which can simultaneously measure multi-physical quantity and chemical quantity; giving information can
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comprehensively reflect material movement rules.
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Self compensation and computing functions
Engineering and technical personnel who engaged in sensor many years has been doing a lot of compensation for temperature
drift and output nonlinearity of sensor, but it can not fundamentally solve problems. And self compensation and computing
functions of the smart sensor opened a new road for sensor temperature drift and nonlinear compensation.
Self-checking, self-correcting, self-compensation, and self-diagnosis function
Common sensor need to inspect periodically to ensure its accuracy in normal use. These work general required finishing in a lab
or inspection department. Online measurement sensor abnormal cannot timely have diagnosis. Using intelligent sensor can
change this situation. Its self diagnosis function can have self checking when the power is connected, diagnostic tests to
determine self-inspection component is trouble-free. Secondly according to use time, it can have on-line calibration;
microprocessor using the metrological performance data exists within an EPROM to compare and proofreading.
Information storage and transmission
With the rapid development of Smart Distributed System, the intelligence unit is required to have communication function, using
communications network in digital form to realize the two-way communication. This is one of the key standards of smart sensor.
Smart sensor through test data transmitted or received instructions to realize all kinds of functions, such as gain setting,
compensation parameters settings, inner inspection parameters settings, test data output, etc.
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