Design and Accuracy Improvement of Organic Gases Monitor for Cultural Relics Protection
An organic gases instrument for monitoring of volatile organic gases in museum is presented. The key technologies of the monitor are the quartz crystal gases sensor and the frequency measurement. The sensor platform employs quartz crystal resonator as the base, using a direct current plating technology to plate polyaniline film on the one of the electrodes. Since the organic gases concentration is converted to the frequency fluctuation of the quartz crystal gases sensor, the detection accuracy is decided by the frequency measurement accuracy. There are three key factors leading to low accuracy. They are time base error, triggering error and quantization error. The temperature compensated crystal resonator is applied as reference frequency signal source in order to reduce the time base error. The 16-bit highspeed MCU and high-speed CMOS chips are employed to reduce the triggering error. Compared with the equal precision frequency measurement method, the accuracy of the monitor can be improved two orders of magnitude with the application of the complete synchronous frequency measurement method. The accuracy of the monitor can be greatly improved through these methods and the perfect solutions are demonstrated as emphases in this paper.
quartz crystal gas sensor time base error triggering error quantization error complete synchronous frequency measrement
WANG Hui-feng HU Zhong-ze Qin Tian
School of Information Science & Engineering East China University of Science and Technology Shanghai, China
国际会议
长沙
英文
914-917
2010-03-13（万方平台首次上网日期，不代表论文的发表时间）