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为了快速,准确地实现金属及合金中氮含量的数字直读,研制了模拟积分运算的数据处理系统。本文着重讨论系统各环节的主要作用及如何减小系统积分漂移值;同时考察了该系统的积分重现性和积分漂移等技术指标。此运算系统用于悬浮定氮所达到的技术指标为:运算灵敏度1ppm;运算精度±2ppm或±2％;分析范围1～6000Ppm;重量补偿最大相对偏差<1％。影响运算精度的关键指标积分漂移值巳达到±0.2mV级(1克试样2分钟内条件下,美国LECO公司RH-1E定氢仪士10mV内,上海二分厂MHS—806定氢仪最大圭10mV),这就为难熔金属快速准确地定氮提供了先决条件。此运算系统可推广用于金属中定氢、定氧以及其它需要进行积分运算的场合。
In order to realize the digital direct reading of the nitrogen content in the metal and the alloy quickly and accurately, a data processing system of analog integral calculation was developed. This article focuses on the main role of the various aspects of the system and how to reduce the system integral drift value; at the same time, the system of integral reproducibility and integral drift and other technical indicators. This computing system for suspended nitrogen achieved by the technical indicators: computing sensitivity 1ppm; computing accuracy ± 2ppm or ± 2%; analysis range 1 ~ 6000Ppm; weight compensation maximum relative deviation <1%. The integral drift value of the key index that affects the operation precision has reached ± 0.2mV grade (within 1m of 1-gram sample, the maximum RH of RH-1E within 10mV from Shanghai LECO Co., Ltd. and MHS-806 from Shanghai No. 2 Factory 10mV), which provides a prerequisite for the rapid and accurate determination of nitrogen in refractory metals. This computing system can be extended for metal hydrogen, oxygen and other needs of the integral operation of the occasion.