Meriläinen P T
Datex Instrumentarium Corp., Helsinki, Finland.
Int J Clin Monit Comput. 1988;5(3):187-95. doi: 10.1007/BF02933716.
A differential oxygen sensor using the paramagnetic principle in a pneumatic bridge configuration has been constructed and tested. The signal being picked up with a differential pressure transducer is generated in a measuring cell with a strong magnetic field being switched on and off with a frequency of 110 Hz. The output signal is a DC-voltage proportional to the O2 concentration difference between the two gases to be measured. A response time of 130 ms has been obtained. A special emphasis on the mechanical design was put to minimize the internal magneto-mechanical noise and to attenuate the external pressure and vibration interference. To eliminate the relatively strong temperature dependence of the paramagnetic effect a compensation circuit was designed as an integral part of the sensor. In performance investigations linearity, stability, noise, humidity and pressure effects as well as sensitivity for other gases were studied.
一种采用顺磁原理、基于气动桥路结构的差分氧传感器已制造完成并经过测试。由差压传感器采集的信号在一个测量池中产生，在该测量池中，强磁场以110Hz的频率开启和关闭。输出信号是一个直流电压，与两种待测气体之间的氧气浓度差成正比。已获得130ms的响应时间。在机械设计上特别强调尽量减少内部磁机械噪声，并减弱外部压力和振动干扰。为消除顺磁效应相对较强的温度依赖性，设计了一个补偿电路作为传感器的一个组成部分。在性能研究中，对线性度、稳定性、噪声、湿度和压力影响以及对其他气体的灵敏度进行了研究。
