Design of Signal Conditioning Circuits for Impedance Detection of Milk Bacteria
The impedance method detection of milk bacteria requires a high quality signal. In order to meet the requirement, a complete signal conditioning circuit is designed and analysised in this paper. Firstly, Biological signals can be reflected in form of electrical signals by impendance sensor. Secondly, In order to detect weak signals in noises. I have designed Preamplifier circuit. Low-pass filter amplifier circuits Modulate and Demodulate Circuits. At last, Math-ematical models are established after comparison test and the theory analysis. Experimental results show that the signal conditioning circuit can effectively improve SNR, and the sensor output signal can be amplified between 0 and 5V. The system can provide reliable signals for upper computer and display system.
detection Impedance sensors Signal conditioning circuits
Zhen Zhou Jie Wang YongQin
Harbin University of Science and Technology Harbin 150080,Hei longjiang China
国际会议
The 6th International Forum on Strategic Technology(IFOST 2011)(第六届国际战略技术论坛)
哈尔滨
英文
818-821
2011-08-22（万方平台首次上网日期，不代表论文的发表时间）