A Low Cost Inkjet-Printed Mass Sensor Using a Frequency Readout Strategy.

Area of Science:

• Materials Science
• Sensor Technology
• Mechanical Engineering

Background:

• Low-cost mass sensors are crucial across diverse scientific fields.
• Existing sensor technologies often face limitations in cost, robustness, or precision.
• Inkjet printing offers a promising low-cost fabrication method for micro-devices.

Purpose of the Study:

• To propose and characterize a fully inkjet-printed mass sensor.
• To investigate the sensor's performance using a PolyEthylene Terephthalate (PET) cantilever beam.
• To evaluate the effectiveness of an inkjet-printed strain sensor and planar coil for actuation and sensing.

Main Methods:

• Fabrication of a PET cantilever beam with integrated inkjet-printed strain sensor and planar coil.
• Utilizing the first natural frequency of the cantilever beam for mass sensing.
• Employing a magnetic actuation strategy linked to the planar coil.
• Characterization of sensor performance, including working span and resolution.
• Modeling to predict and understand the sensor's behavior.

Main Results:

• Successful realization of a fully inkjet-printed mass sensor.
• Demonstrated robustness of the frequency readout strategy against various interfering factors.
• Achieved a working span of 0-0.36 g.
• Obtained a high resolution of approximately 0.001 g.
• Identified frictionless actuation as a design limitation.

Conclusions:

• The inkjet-printed mass sensor provides a low-cost, robust, and accurate solution for mass measurement.
• The frequency readout mechanism enhances reliability and reduces sensitivity to environmental factors.
• The device is suitable for applications demanding high precision within a specific mass range.