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제목 Pressure Compensation of a CO2 Sensor Application Note
작성자 올센싱 (ip:)
  • 작성일 2021-11-04 15:11:32
  • 추천 추천하기
  • 조회수 23
평점 0점
   
   
https://campaign-image.com/zohocampaigns/174213000014464006_zc_v32_1614671409739_survey_march2_2021_logo.png

   

Application Note - Pressure Compensating of a CO2 Sensor 

Non-dispersive infra-red (NDIR) sensors work by measuring the amount of IR light absorbed by the target gas in a fixed volume. Gas concentration is proportional to the amount of light absorbed as it passes through the gas. 


The amount of light absorbed by the target gas, and hence measurement accuracy, is influenced by external environmental factors. The absorption of IR light is dependent on the number of gas molecules present in the fixed volume. Three factors influence the number of molecules in this fixed space, the gas concentration, gas temperature and gas pressure. To accurately measure gas concentration, it is therefore important to understand the effects of temperature and pressure. 


The general behaviour of a gas, due to changes in temperature and pressure is based on well understood laws. However, the effects of temperature and pressure on the absorption of infra-red light by gas molecules and how they influence measurement accuracy are less well understood.


Changes in ambient temperature and pressure will induce CO2 concentration measurement errors unless corrected.  This application note describes the impact of temperature and pressure on measurement accuracy and how these effects can be compensated.

   

What's Inside the Application Note? 


  • The Basic Principles of How Pressure Affects Gas Molecules
  • Environmental Factors that are Involved? 
  • Absorption of CO2 Gas Due to Pressure 
  • What are the Compensation Options? 
  • Applying Pressure Compensation
  • Compensating for Effects of Spectral broadening


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