一种CO_2探空测量方法的电路设计改进

An Improved Circuit Design for Atmospheric CO_2 Balloonsonde Measurement

介绍了一种CO_2探空测量方法。其原理是利用朗伯-比尔定律,使用非分光红外法,通过选择合适的红外光源和红外探测器,设计了合理的电路,在定标的基础上将测量的光强转换成CO_2浓度,制作出可用于探空测量的实验装置。通过与EC9820型CO_2分析仪的地面对比试验,结果表明,连续12天测量的趋势一致,平均误差为9.835 ppm,验证了设计的可行性,基本满足了大气CO_2探空的精度需求,为进一步研制CO_2探空仪提供了参考。

A method is presented for atmospheric CO_2 balloonsonde measurement. Based on Beer-Lambert law and non-dispersed infrared（NDIR） technique, an experimental device is designed and developed. An infrared LED is used to produce suitable light source, and infrared LED detectors and a proper designed electronic circuit are used to transform light intensity into electrical signals in the experimental device. Calibration method for CO_2 measurement is also presented. A comparison experiment is carried out for continuous 12 days on ground with EC9820 analyzer. Result shows that the trend of the measurement data of 12 days is consistent, and standard deviation is 9.835 ppm, which basically satisfies the precision demand for atmospheric CO_2 measurement. The feasibility of CO_2 measurement has been validated.