Foreword
In recent years, as the progress of science and technology, discharge measured a technology to get high-speed develops, to it corresponding discharge calibration technology also is taken seriously with concerned branch by scholar of domestic and international expert more and more.
Method of traditional liquid discharge calibration has two kinds: It is cubage firstly (time) law; It is quality secondly (time) law. Among them, cubage law is divided again for static cubage law and dynamic cubage law, quality standard is divided again for static quality standard and dynamic quality standard. Although these 4 kinds of methods can satisfy the requirement of discharge calibration inside certain limits, but the limitation as a result of state of technology, put in many apparent weakness however, these defect basically are:
(1) unit volume is relatively huge, take up working surface is accumulated big, need job medium is much.
(2) of different level open model, it is working medium volatilizes easily, evaporate and be waited for by pollution, affect calibration accuracy already, make change again the cycle of medium shortens.
(3) because accept the restriction of itself structure, total accuracy rises very hard again.
(4) with the computer control compares difficulty.
At the beginning of 90 time, the United States rolled out device of a kind of new-style liquid discharge calibration, it basically overcame 4 of afore-mentioned traditional methods main drawback. This device is used " dynamic displacement -- time method " measure a principle, its are basic measurement technique is the measurement that is based on cubage and time, but be different from law of cubage of afore-mentioned static state and dynamic cubage law completely again. The time that we used 3 years or so pressed this principle development to succeed device of calibration of a slippery oily discharge, its are main technical index is achieved and exceeded the United States the technical index of this device.
Principle of 1 unit work