Li-na HAN（韩丽娜）, An-li TAO（陶安利）, Shao-gang LI （李绍刚 ）, Jun-guo LIU（柳军国）, Yun-zhou LI（厉运周）, Xiang-zhong LI（李相众）
School of Information Science and Engineering, Shandong Universit y of Science and Technology, Qingdao 266510, China
Abstract-In order to overcome the deficiencies of traditional pressure sensors, a kind of intelligent pressure sensors with temperature correc tion is designed. According to the intelligent sensor system of composition and range of applications, with fully taking into account the parameters of the conn ection between components of co-ordination, we chose a good usability, high rel iability and low cost components composed of the entire measurement system, with controlling and dealing with in 80C51 microcontroller, the system had the tempe rature and pressure parameters with automatic measurement, amplification, A/D co nversion, the weak signal locked amplification, as well as Phase-Sensitive Dete ction (PSD), common-mode signal rejection, the collected signal de-noising pro cessing, cross-sensitivity of the decoupling and show the results. It also has a self-test, automatic temperature compensation and on-site communications and other functions.
Key words-pressure sensor; Lock-in Amplifier; 80C51F35 0 SCM; hardware circuitry
Manuscript Number: 1674-8042(2011)02-0157-04
dio: 10.3969/j.issn.1674-8042.2011.02.14
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