| Currently the petrochemical section uses large to keep the bottle mostly thesign type cylinder form oilcan or the spheroid bottle, its capacity generally in1000-100000 m 3.the pimping diagraph error margin will result in the very greatlyabsolute error margin. So the calculate of the exaltation oil accuracy andautomations manage the level which is a development direction that measures theinstrument. Since 80's, along with the micro-electronics, calculator, fiber optic, awave, spread the fast fierce development of the high technology of etc. someflourishing nations seep into various new technique, new method, new appearanceto keep the oilcan to calculate the realm in succession, making keep the oilcan oilquantity to calculate to come to a the multi-function and high accuracyautomatically, new stage turn on the scene.Turn the examination along with the intelligence technical developcontinuously, make use of a wave to carry on the amount of oil examination to risein gas station and oil depots the more and more important function. Use a wavemedium that is the feeling to know or examine the object, have the non-destructiveness, control from a distance sex, and can wear deeply etc. advantage, inmany respect body now original place that other methods nothing.Although now has an instrument of various liquids to provide the customerchoice, in consideration of price, the convenience for install or not, the measuredaccuracy etc. problem, but for the small scaled gas station that funds abundant not,can be provided as the oil measurement of the choice quantity instrument not somuch. Research to manufacture a kind of install, the usage is simple, measureaccurate again the price cheap oil measurement quantity the instrument is this topicto want the finished mission.The main research work of this text is as follows:1,Analyzed a possibility that measures to be apart from. Because an amount of oilcalculates the instrument request to design to install to cover in the watch well,the measured space is very narrow and small, but a wave again is to can't seethe wave, a signal that spreads the feeling machine to receive machine till,whether face the reflective signal from the liquid exactly, if can't make sure,will give signal the processing brings the certain difficulty, thus result inmeasure up of error margin. Pass to compute the voice to press to reflect thecoefficient, the voice presses to project the coefficient, a strong glint coefficient,the voice is strong to shoot the coefficient deeply, and analyzing the wave tie isperpendicular to go in to shoot two kinds of lie the quality of the circumstanceof the interface. Be equal to the glint Cape principle through an angle ofincidence, analyze the wave tie inclined go in to shoot the liquid to face andwell wall of circumstance. Get finally although a wave has the energy toexhaust in spread process, and the wave tie and can have various pathdissemination, still exist various interference signals at the same time, in regardto receive machine till° of signal strong or weak, only have to face the moststrong conclusion in reflective signal from the liquid.2,Designing a wave shoots the electric circuit. A function that shoots the electriccircuit is to enlarge the pulse signal of the 40 KHz that a machine deliver tothe 20 v , to satisfy a wave to shoot to spread the feeling machine to drive therequest. A wave of T/R40-16 that this oil measurement quantity instrumentuse spreads the feeling machine in the frequency 40 KHz , an electric voltagethat is worth the 20 Vs drive under, various function is the best, so give shootthe electric circuit through the pulse signal that a machine outputs the 40KHz .Because the exportation electric voltage of a machine is a 5 Vs, it drivethe ability to can not reach the request, so used a CMOS of big power tubeIRF640 to drive a wave blast-off machine that spreads the feeling machine. Thetransformer is main to raise the insulation here function.3,Designing a wave receives the electric circuit. A wave receives the electriccircuit to mainly include to enlarging;the electric voltage compares and breaksoff the signal exportation etc. part. It is to use to come to receive of return towave to carry on enlarge and orthopedics, will soon return to a signalconversion to become the interruption signal of a machine.4,The system software design. The way of thinking of design is: Carry on thesystem beginning's start to turn first, then input the relevant parameter, shootingthe pulse string immediately after, account and compute the depth, physicalvolume of the oil etc. data, whether the end judgment have the key to press ornot, according to the key press, a machine will adjust to complete the differentfunction with the different function mold piece for example: Print,communication etc.5,The anti-interference processing. The interference mainly circulates to result inthe bad influence to the software will break the saving data within machine ofRAM on the other hand, on the other hand possible because of some accidentalof reason but enter die circularly, make the whole system lose control. Thehardware anti-interference mainly passes to solve to a technique of and thehardware" watchdog" electric circuits. The software anti-interference passes tobeg average value and the software" watchdog" to the diagraph data to solve.Thus remove the interference source, repress the to match the passage, diedown the electric circuit to the sensitivity of an interference.6,Passing the experiment to get the more satisfied experiment result. Combined tocarry on the analysis to the error margin. Velocity of sound and more time is aninfluence to measure two main reason of result. Put forward a way that lets upthe error margin. Pass the velocity of sound to measure to compensate actuallyto measure the error margin that the repair can let up the velocity of sound toresult in with temperature actually, pass to return to a signal to carry on enlargecan let up the more time result in of error margin.This text is carrying on the analytical foundation of theories to a possibilitythat measures to be apart from up, make use of the calculator technique, electronicstechnique, and a wave at lie the dissemination in the quality characteristic etc.,research to manufacture an oil measurement measures the hardware part of theinstrument, the plait wrote the homologous software procedure, and carried on toadjust to try and try the movement. Discussed various reason of the creation errormargin, put forward the homologous solution, for researched to manufacture an oilmeasurement quantity instrument to beat to descend the foundation. |
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