The Temperature Measuring On The Barrel Of The Anti-aircraft Gun During Firing Based On Infrared Technology

During the anti-aircraft gun firing, the barrel temperature rises sharply. The highest temperature of anti-aircraft gun barrel can bear is decided by the material and the length of the barrel and the thickness of barrel wall. While the anti-aircraft gun firing, the gunpowder explosion produces a large number of heat and gas, instantaneous formation of high temperature and high pressure environment. Especially under the condition of continuous emission, barrel temperature rises more obvious. High barrel temperature can cause the dropping pressure inside the barrel, reduced initial speed of the shell and the decreased accuracy of shooting. When these severe cases get to a certain degree, the barrel is discarded. So, the temperature of the barrel during firing is the most important basis to measure the quality of anti-aircraft gun.According to the characteristics of the measurement on the gun barrel, a system which is based on the principle of colorimetry temperature measurement of infrared temperature measurement technology is designed. The system overcomes the disadvantages such as complicated operation and the easily damaged devices. The system combines the hardware, such as infrared temperature measurement device, with the virtual instrument LabVIEW to realize the temperature measuring on the barrel of the anti-aircraft gun during firing. At the same time, the system also has the function of wireless data transmission which is helping for data storage and management.The temperature measuring system designed by this thesis is mainly composed of temperature data collection, data processing and temperature data transmission. Based on the principle of heated object emitting the infrared energy, a appropriate infrared detector is chosen to collect the different wavelengths of infrared energy emitted by the object. A data acquisition card sends the collected energy data to the LabVIEW in a computer. According to the principle, the colorimetric temperature measurement will be realized in the LabVIEW software. For the errors in the colorimetry temperature measurement, this thesis which abandons the traditional method of object emissivity correction, respectively, uses the least square method and cubic spline interpolation method to analysis the errors to get two kinds of fitting curve equations. The experiment proofs that the errors in the cubic spline interpolation is minimum. So, it is more practical engineering significance. The final temperature data can be transmitted by wireless transmission module to the distal frontal staff for observing and data processing.The temperature measuring system designed by this thesis has been carried out to verify under the condition of laboratory experiments. The experimental results show that the system has the characteristics of good real-time, high accuracy and good stability. So the system can meet the requirements of the temperature measuring on the anti-aircraft gun barrel during firing.