Journal of Guangdong University of Technology ›› 2015, Vol. 32 ›› Issue (3): 85-90.doi: 10.3969/j.issn.1007-7162.2015.03.016

• Comprehensive Studies • Previous Articles     Next Articles

Design of Realtime Oxygen Detection System in AC and DC Circuits

Liang Jun， Du Yu-xiao   

  1. School of Automation, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2014-03-14 Online:2015-09-22 Published:2015-09-22
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Abstract: For the requirements for accuracy, antiinterference and power saving of oxygen system parameters by oximeter, this paper proposes a signal amplification design by using a differential op amp amplifier circuit to enhance the signal to noise ratio and increase signal common mode rejection ratio. And because of the measurement of ambient light interference, a set of ACDC flow separation circuit is also designed which can effectively separate hardware red and infrared light, eliminate the interference of ambient light and improve the working capacity of the system. Meanwhile using differential threshold amount to process oxygen parameters can improve the signal system greatly. Hence the circuit simulation and test results demonstrate the feasibility and reliability of the whole design.

Key words: signal acquisition, differential threshold, oxygen content, ACDC separation circuit

CLC Number: 

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