评估低成本的CO2传感器使用参考仪器和标准气体用于室内使用
Qixiang Cai1,2, Pengfei Han3,4, Guang Pan5
1State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China.
Sensors (Basel, Switzerland)
|May 11, 2024
概括
在城市中,精确的二氧化碳 (CO2) 监测至关重要. 一种新的校准方法显著提高了低成本传感器的准确性,使得二氧化碳观测对排放评估更加可靠.
科学领域:
- 环境科学 环境科学
- 大气化学 大气化学
- 传感器技术 传感器技术
背景情况:
- 二氧化碳 (CO2) 监测对于评估城市碳排放至关重要.
- 低成本和中等精度传感器 (LCSs) 为复杂的城市环境中的二氧化碳观测提供了一个有前途的途径.
- SenseAir K30 CO2 传感器是一种用于监控仪器的LCS类型.
研究的目的:
- 为了提高SenseAir K30 CO2传感器用于城市排放监测的准确性.
- 在稳定的室内环境中评估校准的二氧化碳监测仪器 (SENSE-IAP) 的性能.
- 为了建立最佳的校准频率,以保持传感器的准确性.
主要方法:
- 为了提高SenseAir K30 CO2传感器的精度,开发了一种校准方法.
- 自2017年以来,使用校准传感器的SENSE-IAP仪器已在多个中国城市部署.
- 使用SENSE-IAP,Picarro参考仪器和标准气体,每月至每年进行同步观测.
主要成果:
- 校准方法使传感器的精度从±30 ppm提高到0.7-4.0 ppm.
- 在稳定的室内环境中,SENSE-IAP显示出良好的精度和准确性:每日偏差从-0.9到0.2 ppm,每日RMSE从0.7到1.6 ppm.
- 长期表现显示每月偏差从-1.6到0.5ppm,RMSE从1.3到3.2ppm.
- 与皮卡罗的同步观测结果为2.0-3.0 ppm的RMSE.
结论:
- 标准仪器或可靠的标准气体是提高SENSE-IAP准确性的有效参考.
- 每天使用标准气体进行校准,可以保持SENSE-IAP偏差在1.0ppm以内.
- 建议校准频率至少为三个月,以保持精度在3ppm内,当频繁的校准是不可行的.
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