针对传统流量传感器的量程限制,提出了一种基于双螺旋结构加热器的柔性基底微机电系统(MEMS)热式流量传感器。在基底上打出均匀通孔阵列以降低热传导损耗,两对测温电阻对称分布在加热器两侧,以获得较宽量程,在微小流量与大流量下均表现出较高灵敏度。采用基于惠斯通电桥的检测电路实现输出电压的测量,同时保持加热器与环境温度恒定温差200 K
对电阻自热进行补偿。传感器工作温度-100~400℃
量程为0~60 m/s;低流速下灵敏度约为12.75 V/(m·s
-1
)
分辨率可达0.001 mm/s
高流速下灵敏度约为1.4 mV/(m·s
-1
)
功耗低至1.3 mW。
Abstract
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references
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