基于比色原理的镁合金燃点测温系统研究

针对传统镁合金燃点测试方法具有的响应速度慢,破坏被测温度场,测温精度低等弊端,提出了一种新型的比色测温系统。介绍了系统的测温原理及结构,提出根据镁合金燃烧时光谱强度出现爆发性增长导致系统两路光辐射电压输出曲线出现拐点来确定镁合金燃点的方法。利用光谱仪测量镁合金燃烧前后的光谱强度,为选取系统带宽和确定系统中心波长提供依据。利用高温黑体校准源M390对比色测温系统进行静态校准,获得系统的静态校准系数,最后利用大功率直流电源作为热源点燃镁合金(AZ80),同时分别利用已标定过的比色测温系统和高速工业级光纤红外变送器OS4000测量镁合金燃点温度,结果表明两者之间的相对误差为0.98%。

Research of Magnesium Alloy Ignite Temperature Measurement System Based on Colorimetric Principle

Aimed at the disadvantages of traditional magnesium alloy ignite temperature measurement method, which included slow response speed, ruinous temperature field, low temperature measurement accuracy and so on. A new colorimetric temperature measurement system was proposed. The temperature measurement principle and structure were introduced, the method, which made sure the ignite temperature of magnesium alloy, based on the spectrum of magnesium alloy increased explosively at igniting magnesium alloy and inflection point of two-way optical radiation voltage output curves was proposed. Spectral intensity before and after igniting magnesium alloy was measured by spectrograph, the results provided reference for selecting system bandwidth and confirming system central wavelength. Colorimetric temperature measurement system was calibrated by high temperature black body calibration source M390, the static calibration coefficient K was gained. Final, magnesium alloy(AZ80) was igniting by high-power direct-current main, meanwhile the ignite temperature of magnesium alloy was measured by the calibrated colorimetric temperature measurement system and high speed fiber optic infrared transmitter OS4000 respectively, the result show that the relative error among them is 0.98%.