Pressure sensor heats up the compensation technology of zero shift
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source:MOMEYER CNC Machining
Compensate a problem about the zero shift of pressure sensor, domestic and international scholar had done a large number of research, published a series of compensation technologies and algorithm. Will divide from whole, can divide for hardware compensation and software compensate two general orientation. Part to make simple introduction with respect to the representative method of these two direction below. 1, hardware compensated a method to be opposite at 0 o'clock pressure sensor, compensation method has hardware to be strung together on bridge arm, paralell connection is appropriate and constant resistance standard, bridge arm thermal resistor compensation method, string together outside the bridge, compensation method of shunt-wound thermal resistor, double bridge compensates technology, dynatron to compensate a technology to wait. 2, method of software compensation zero shift collects a process in signal in, in spark signal did not happen to spark collect and these time after collecting an end Duan Li, the signal of the input is 0, the signal of output is 0, this kind of output data that collects exists with the form of random noise, the computation to data and processing are no point, we define what the signal cost that collects in this paragraph of time says to be zero shift. 3, multinomial plans to because be being measured actually,combine standardization magic art in. The physical quantity such as the temperature that pressure sensor place measures, pressure won't is worth with output is severe linear impact, accordingly its function concerns often polynomial form. Of signal of linear of polynomial usable Yu Fei plan to close, the key depends on seeking solution its each coefficient. 4, law of RBF nerve network fundamental: Formulary law is normally more complex in algorithm of temperature compensation software at 0 o'clock, cut plan to add up to precision regular meeting to be restricted. Law of artificial nerve network has use sample book number is little, algorithmic and simple, have aleatoric function to approach capacity, applied prospect is good. In addition software law still includes the law that check a watch, interpolation to wait, still a few manufacturer set out from the characteristic of sensor itself, use special technology, if change impure chroma to wait, perhaps use the issue that will solve zero shift from calibration technology, but these methodological compensation precision are not tall, the effect is far good without 3 kinds of afore-mentioned methods, because be not listed one by one here. Conclusion as a whole, afore-mentioned hardware compensation, software compensates a method, all can realize the sensor zero shift that temperature causes, it is the way of effective. But relatively in light of foreign development state of affairs, what we do is far insufficient still, the way of ahead is very long still. Draw lessons from domestic and international sensor to produce manufacturer to was compensated at 0 o'clock, temperature compensated craft at 0 o'clock, accumulate experience, develop development independently. Hardware compensation is admittedly important have its advantage place, but after all IT is developing, instrument equipment miniature is changed, intelligence is changed is self-evident big trend, so we must intensify our compensating methodological research, compensate a respect in software especially, use nerve network method to compensate more appear particularly important. CNC Milling