Temperature Modulation with Specified Detection Point on Metal Oxide Semiconductor Gas Sensors for E-Nose Application
Temperature Modulation with Specified Detection Point on Metal Oxide Semiconductor Gas Sensors for E-Nose Application
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发表时间：
2015
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通讯作者：
A. Sudarmaji;A. Kitagawa
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作者：
A. Sudarmaji;A. Kitagawa
金属氧化物半导体（MOS/MOX）气体传感器的温度调制技术，也称为动态测量模式，在许多领域得到了广泛的应用。本文介绍了它的发展，在MOS传感器的调制敏感元件上引入了一个特定的检测点（SDP），它与MOS传感器的温度调制有关，即温度调制-SDP。利用片上可编程系统芯片CY 8 C28445 - 24 PVXI（Programmable System on Chip）实现了MOS气体传感器（TGS和菲斯）矩形波调制信号的采集和计算机接口。使用统计工具和主成分分析（PCA）进行初始响应和选择性评估，以在各种频率（0.25 Hz，1 Hz，4 Hz）和占空比（25%，50%，75%）下的动态室测量上区分样品气体（甲苯，乙醇和氨）。我们发现，在较低的频率下，传感器的响应波形变得更加倾斜和明显，并且所选择的调制成功地增加了对单个或阵列传感器的选择性，而不是静态温度测量。版权所有© 2015 IFSA Publishing，S. L.
Temperature modulation technique, some called dynamic measurement mode, on Metal-Oxide Semiconductor (MOS/MOX) gas sensor has been widely observed and employed in many fields. We present its development, a Specified Detection Point (SDP) on modulated sensing element of MOS sensor is applied which associated to its temperature modulation, temperature modulation-SDP so-named. We configured the rectangular modulation signal for MOS gas sensors (TGSs and FISs) using PSOC CY8C28445-24PVXI (Programmable System on Chip) which also functioned as acquisition unit and interface to a computer. Initial responses and selectivity evaluations were performed using statistical tool and Principal Component Analysis (PCA) to differ sample gases (Toluene, Ethanol and Ammonia) on dynamic chamber measurement under various frequencies (0.25 Hz, 1 Hz, 4 Hz) and duty-cycles (25 %, 50 %, 75 %). We found that at lower frequency the response waveform of the sensors becomes more sloping and distinct, and selected modulations successfully increased the selectivity either on singular or array sensors rather than static temperature measurement. Copyright © 2015 IFSA Publishing, S. L.