title: [An experimental study of the effect of structure sealing of infrared CO2 sensor on its accuracy].
abstract: OBJECTIVE
  To study the effect of structure sealing of infrared CO2 sensor on its accuracy.
  
  
  METHODS
  Two experiments were designed. The IR CO2 sensor based on infrared principle and no comparing lighting path with only one beam of light were calibrated in one experiment, and in the other experiment the sensors were placed in an environment simulating the practical condition. The temperature, pressure and standard gas were kept same in the two experiments while CO2 concentrations in the dead volume were varied.
  
  
  RESULTS
  Readings from the sensors varied with the variation of the CO2 concentration in the dead volume of the sensors.
  
  
  CONCLUSIONS
  The structure sealing of the IR CO2 sensor has great influence on its accuracy. A sealed dead volume in the IR CO2 sensor can decrease or eliminate the effect.
authors.affiliation: Institute of Space Medico-Engineering, Beijing, China. hg1971@vip.sina.com
authors.forename: Gang
authors.initials: G
authors.lastname: Huang
authors.forename: Yi-bing
authors.initials: YB
authors.lastname: Deng
authors.forename: Bo
authors.initials: B
authors.lastname: Xu
authors.forename: Wei-rong
authors.initials: WR
authors.lastname: Wang
authors.forename: Lin-gen
authors.initials: LG
authors.lastname: Xia
authors.forename: Zhao-gang
authors.initials: ZG
authors.lastname: Chao
authors.forename: Xiao-xia
authors.initials: XX
authors.lastname: Wang
mesh_terms: D001274:Atmospheric Pressure; D002138:Calibration; D002245:Carbon Dioxide; D004784:Environmental Monitoring / Q000295:instrumentation*; D005069:Evaluation Studies as Topic; D007259:Infrared Rays; D012680:Sensitivity and Specificity
chemical_list: D002245:Carbon Dioxide