基于自干涉技术的超声波氧气传感器设计  

Design of a ultrasonic oxygen sensor based on self-interference technology

作　　者：马志浩[1] 

机构地区：[1]西南科技大学信息工程学院光声检测研究室,四川绵阳621000

出　　处：《传感器世界》2014年第1期24-27,共4页Sensor World

摘　　要：系统依据二元混合气体检测理论采用超声波技术测量混合气体中氧气的浓度,并针对超声波测量过程中渡越时间易受噪声干扰的问题,设计了一种采用自干涉技术的超声波式氧气传感器。本文首先介绍了二元混合气体检测理论,之后详细介绍了超声波自干涉现象产生机理,最后完成了系统中整个自干涉激励,检测电路的设计,其中详细介绍了系统核心EPM1270内的各个模块的功能。实验结果表明,本系统完全能够实现对氮,氧混合气体中氧气浓度的实时测量,相比传统的超声波式氧气传感器,该系统具有更高的测量精度,更强的抗干扰能力。Based on the binary gas mixture detecting theory, a system is designed in this paper to measure the concentration of oxygen in gas mixtures with ultrasonic technology. In order to solve the problem that the ultrasonic transit time is susceptible to noise in measurement, an ultrasonic oxygen sensor is designed based on the self-interference technology. Firstly the binary gas mixture detecting theory is introduced. Then the formation mechanism of the ultrasonic self- interference phenomenon is described in detail. In the end the design of the self-interference excitation and test circuits is completed, which realize the functions of signal incentive and signal detection. The details of each module in EPM1270 are presented. Experimental results show that the system can realize the real-time measurement of oxygen in gas mixtures of nitrogen and oxygen. And more importantly, the sensors has higher measuring precision and stronger anti-interference ability.

关 键 词：超声波 氧气传感器 自干涉 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]