Embedded Pressure Source Automatic Portable Pressure Calibrator

The pressure of metrical gauge is the metrical equipments of the indispensability in the industrial production line, in great quantities applied in various productions. For the sake of the accuracy and reliability of the pressure calibration, the pressure gauge must be checked periodically. The traditional manual pressure calibration methods are subjected to low efficiency, high labor intensity and low calibration accuracy due to human factors. The development history and present conditions of the pressure calibration are summarized in this dissertation, aim at the special demand of the oil-field pressure gauge field calibration, put forward an idea of developing portable pressure calibration instrument which can check the pressure full-automatic and with the pressure source inside, and do the research on a few main technique key problems of pressure calibration instrument which would be resolved. Main work and the result are described as follows.The first, do the research on pressure automatically generating device and control method, put forward a kind of standard pressure method of certain steps, and could occurrence pressure accurate, fast, stabilize and have no super adjust of creation which is pressure calibration instrument need; The second, aim at present conditions that a great deal of transducer and pointer gauges are all of applied, the automatically read system is researched, the automatical read system of pointer gauge become true by the method of image processing; The third, do the research on the temperature drift of standard pressure sensor, and carrying on the temperature compensation by linear of vicariate interpolation for improving measure accuracy.