高气压环境对红外二氧化碳传感器检测的影响  

Effects of hyperbaric environment on the detection of the infrared CO2 sensor

作　　者：闫硕[1] 方以群[1] 鲁刚[1] 

机构地区：[1]海军医学研究所,上海200433

出　　处：《中华航海医学与高气压医学杂志》2014年第4期256-259,共4页Chinese Journal of Nautical Medicine and Hyperbaric Medicine

摘　　要：目的 在失事潜艇及加压舱内等高气压环境下二氧化碳气体浓度的检测要求传感器具备高准确度、灵敏度和高响应速度.高压下常规二氧化碳传感器存在失效或响应失真的问题,只能在减压后间接检测.高压下二氧化碳实时检测,需要探索高气压环境对二氧化碳传感器的影响规律.方法 选取红外二氧化碳传感器作为试验对象,对其元器件进行压力可靠性试验,并利用小型动物加压舱构建一个校准系统,通过理想气体状态方程推算实际气体浓度,对传感器高压下响应曲线进行测定.结果 试验结果表明,在浓度不变的情况下,随着环境静压力的升高,传感器输出电压总体表现出偏小趋势.这种偏差在压力大于20 m后表现得较为明显.结论 在浓度不变的情况下,传感器输出电压随着环境压力的升高而出现的变化可能是由于气体吸收率受压力影响改变而引起的.Objective At hyperbaric environments,such as in the distressed submarine and hyperbaric chamber,the detection of CO2 concentration demands high accuracy,sensitivity and rapid response of the sensor.Since conventional CO2 sensor is confronted with such problems as inefficiency and distortion at high pressure,indirect detection could only be made after decompression.As a first step,real-time detection of CO2 in the hyperbaric environment requires to study the effects of high pressure on the CO2 sensor.Methods The infrared CO2 sensor was chosen as a testing object and pressure integrity test was performed on its elements,and a small animal compression chamber was used to establish a calibration system.Through an ideal gas formula,actual gas concentration was calculated to measure the sensor response curve at high pressure.Results Test results indicated that the output voltage of the sensor at an unchanged concentration generally presented a lower potential with the increase of the static environmental pressure,and the deviation was more marked when the pressure was higher than 20 msw.Conclusions The fluctuation in pressure change might be induced by the fact that gas absorbability was affected by the change in pressure.

关 键 词：高气压 二氧化碳传感器 红外线 

分 类 号：R84[医药卫生—航空、航天与航海医学]