Highly sensitive silicon micromachined tunneling sensors with small size and light mass have been widely explored in the last 15 years. Many types of tunneling sensors have been developed. This paper presents a review of silicon micromachined tunneling sensors. Four types of tunneling sensors including accelerometers
gyroscopes
infrared sensors
and magnetic sensors are reviewed. Various designs
fabrication procedures
performance
control systems
and noise constraints of silicon tunneling sensors are described and discussed. Novel polymer-based tunneling accelerometers fabricated by PMMA and hot embossing technique are introduced. The structure
fabrication process and characterization of the polymer-based sensor are presented. We can expect that the polymer tunneling sensor has the potential to become the basis for the next generation of highly sensitive MEMS-based sensors in many areas.
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references
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