Low Power Operation of Temperature-Modulated Metal Oxide Semiconductor Gas Sensors.
Low Power Operation of Temperature-Modulated Metal Oxide Semiconductor Gas Sensors.
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DOI：
10.3390/s18020339
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发表时间：
2018-01-25
期刊：
影响因子：
--
通讯作者：
Marco S
中科院分区：
文献类型：
--
作者：
Burgués J;Marco S
基于气体传感的移动的应用为低成本空气质量监测、安全和医疗保健提供了新的机会。金属氧化物半导体（MOX）气体传感器代表了集成到便携式设备（如智能手机和可穿戴设备）中的最突出技术。传统上，MOX传感器一直持续供电，以增加传感层的稳定性。然而，由于功耗限制或预期的间歇性设备操作，在许多电池供电应用中，连续供电是不可行的。这项工作的基准两个低功耗，占空比，和按需模式对连续电源之一。占空比模式周期性地打开和关闭传感器，并代表功耗和稳定性之间的权衡。按需操作通过仅在进行测量时为传感器供电来实现最低功耗。12个热调制SB-500-12（FIS Inc.杰克逊维尔，佛罗里达州，美国）传感器暴露于低浓度的一氧化碳（0-9 ppm），环境条件例如环境湿度（15-75%相对湿度）和温度（21-27 ℃）在指定范围内变化。使用校准数据建立偏最小二乘（PLS）模型，并在校准后两周内评估外部验证样品的预测误差。我们发现，按需操作产生的传感器电导模式的变形，这导致了增加的预测误差几乎5倍，连续操作相比（2.2与0.45 ppm）。应用10分钟周期的10%占空比操作将此预测误差降低到2倍（0.9与0.45 ppm）。建议的占空比供电方案节省高达90%的能源相比，连续运行模式。这种低功率模式对于不需要连续和周期性测量并且可以容忍稍高的预测误差的应用可能是有利的。
Mobile applications based on gas sensing present new opportunities for low-cost air quality monitoring, safety, and healthcare. Metal oxide semiconductor (MOX) gas sensors represent the most prominent technology for integration into portable devices, such as smartphones and wearables. Traditionally, MOX sensors have been continuously powered to increase the stability of the sensing layer. However, continuous power is not feasible in many battery-operated applications due to power consumption limitations or the intended intermittent device operation. This work benchmarks two low-power, duty-cycling, and on-demand modes against the continuous power one. The duty-cycling mode periodically turns the sensors on and off and represents a trade-off between power consumption and stability. On-demand operation achieves the lowest power consumption by powering the sensors only while taking a measurement. Twelve thermally modulated SB-500-12 (FIS Inc. Jacksonville, FL, USA) sensors were exposed to low concentrations of carbon monoxide (0–9 ppm) with environmental conditions, such as ambient humidity (15–75% relative humidity) and temperature (21–27 °C), varying within the indicated ranges. Partial Least Squares (PLS) models were built using calibration data, and the prediction error in external validation samples was evaluated during the two weeks following calibration. We found that on-demand operation produced a deformation of the sensor conductance patterns, which led to an increase in the prediction error by almost a factor of 5 as compared to continuous operation (2.2 versus 0.45 ppm). Applying a 10% duty-cycling operation of 10-min periods reduced this prediction error to a factor of 2 (0.9 versus 0.45 ppm). The proposed duty-cycling powering scheme saved up to 90% energy as compared to the continuous operating mode. This low-power mode may be advantageous for applications that do not require continuous and periodic measurements, and which can tolerate slightly higher prediction errors.
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DOI：
10.1016/0250-6874(82)80027-9
发表时间：
1983-01-01
期刊：
SENSORS AND ACTUATORS
影响因子：
--
作者：
CLIFFORD, PK;TUMA, DT
通讯作者：
TUMA, DT
影响因子：
3.1
作者：
Cavaliere F;Volpe C;Gargaruti R;Poscia A;Di Donato M;Grieco G;Moscato U
通讯作者：
Moscato U
影响因子：
7.2
作者：
Boon-Brett, L.;Bousek, J.;Moretto, P.
通讯作者：
Moretto, P.
影响因子：
8.4
作者：
Kim, Yoon-Sung;Hwang, In-Sung;Lee, Jong-Heun
通讯作者：
Lee, Jong-Heun
影响因子：
7.2
作者：
Huebert, T.;Boon-Brett, L.;Bader, M. A.
通讯作者：
Bader, M. A.