炮体表面瞬态温度分布的散斑干涉测试研究

为了可以实现对炮体表面瞬态温度分布变化的实时监测，同时克服传统瞬态高温测试仪器单点探测以及热惯性大等局限性，设计了基于散斑干涉与光谱频域分析相结合的瞬态温度分布测试系统。系统采用散斑干涉技术将炮体瞬态温度变化引发的微小形变转换成散斑干涉条纹，再由傅氏变换完成干涉条纹形变到光谱分布的函数转换，从而通过光谱分布函数反演任意采样时刻上的温度分布。实验采用ZX-FB1型光纤测温仪测试单点位置上瞬态温度作为标准值，再由555 nm激光器与面阵CCD采集散斑干涉条纹，分别使用图像识别法与傅氏变换法完成干涉条纹与瞬态温度的算法匹配，从而反演瞬态温度。实验结果显示，两种方法均能实现瞬态温度检测，但基于傅氏变换频谱分析的散斑干涉法精度更高，并且可以有效地克服由表面瑕疵、漆面磨损等问题造成的粗大误差。

Testing Research of Transient Temperature Distribution for the Barrel Surface by Speckle Pattern Interferometry

There are some problems in the traditional transient temperature test equipment .The thermal inertia is great ,and can only be a single point of detection .To be able to achieve real-time monitoring for transient temperature distribution change of the gun body surface ,the test system for transient temperature distribution was designed based on Speckle Pattern Interferometry (SPI) and spectroscopy .In the system ,transient temperature change of the barrel led to slight deformation ,and it was conver-ted into speckle interference fringes by SPI technology .Spectral distribution function was obtained by the interference fringes by the Fourier transform ,so the information of interference fringe deformation was incorporated into the frequency domain .The da-ta of temperature distribution can be inverted on any sampling time by spectral distribution function .In experiments ,the ZX-FB1 fiber optic thermometer was used to test transient temperature on a single point as the standard value .The center wavelength of the laser was 555 nm ,and the speckle pattern interference fringes were collected by area array CCD .Image Recognition-Speckle Pattern Interferometry (IR-SPI) and Fourier Transform-Speckle Pattern Interferometry (FT-SPI) were used in experiments ,the calculation of transient temperature was completed through two methods .Experimental results are that both methods can achieve transient temperature detection .But the FT-SPI is higher in terms of accuracy ,and it can effectively overcome the gross error caused by the surface defects ,paint wear and other similar problems .