Sensitive Plastic Components Characteristic Parameters Automatically Measuring Instrument Developed

Peak chamber pressure is one of the important parameters which must be measured in the firing weapons design, manufacture and acceptance. The method of plastic deformation pressure for measuring pressure with reliable work, easy to use, low cost, no needed destruction of tested weapons has been the main Chamber pressure test method. The traditional method of plastic sensor measurement and reading only can measure singal point and need the human eyes to determine whether the sensor was been pressured element side, after the measurement of the sensor's height also need to manually look-up table to obtain the pressure value. The whole process is work tedious, error-prone, low level of intelligence.Accordingly, the automatic tester of plastic pressure measuring elements is designed. the automatic tester succeed in the measurement of the heights of different points on the plastic sensor continuously and automatically, judgment of the plastic sensor whether is pressed to element side automatically, the height of measured is transformed voltage automatically.The whole automatic measuring instrument is made up of test plat, height measurement system, pressure deviation measurement system and pressure intelligent system of judgment and reading. the plat is made up of single-chip microcomputer, horizontal stepping motors, Vertical stepping motors, stepping motor which makes the plat rotating,besides,it is also consisted of the three stepping motors' drives, gear transmission mechanism, high precision rotation plat, guide slippery sets, bars institutions and the stent of installing sensor.because of the steeping motors' rotation which controlled by single-chip microcomputer, the plastic sensor is rotated,the grating displacement sensor is shifted in a horizontal direction and the test point of the grating displacement sensor is shifted in a vertical direction according to the request.Height measurement system is made up of grating displacement sensor, the module of collecting height and PC. the zero of grating displacement sensor is controlled by PC, the output signal from the grating displacement sensor is reformed by pressure deviation measurement system, it is subdivided,directed and counted by the system, besides, the conversion of to voltage and the communication between the grating displacement sensor and PC is also realized by this system.Pressure deviation measurement system is made up of CCD camera, USB data transmission interface and PC, the image processing was studied detail. The tested Component's profile is extracted by median filter, Canny edge Detection and morphology, besides, the concentricity of the plastic sensor which was pressed is calculated. it is also determined whether the plastic sensor pressured to element side by the system.The processing of plastic sensor's image in CCD camera is realized by pressure deviation measurement system, it is also determined whether the plastic sensor pressured to element side is by the system.The pressure intelligent interpretation system succeed in data receiving, data transmission, the interpretation of the peak pressure, and also succeed in database management and the function of automatic look-up form to the compared form dynamic pressure,the revised form of pulse width and temperature.The whole system succeeded in anticipative precision by demarcating the system and being compared with micrometer testing outcome with handy operation and reliable work.It works simply and reliably.It removed the easily appeared mistake in the process manual testing, avoided a mass of manual work,improve the testing precision and succeed in the intelligent pressure interpretation of the plastic-measuring elements.