This work was partly supported by JSPS KAKENHI (21H01023). The results were published online in the American scientific journal "Science Advances" on 2 November 2022 (EDT). This new sensing technology, which can be read by an optical fiber, is designed for application to IoT sensors that can perform operations difficult to achieve with conventional methods, such as high-resolution particle detection at desired locations in liquids and the characterization of local fluidic properties in non-uniform solutions. In this research, hair-size mechanical resonators made of fine glass wire were utilized to achieve a sensing technology with high spatial resolution that can measure the fluidic properties and the mass of particles in liquids with ultrahigh sensitivity. Until now, electrical measurements using quartz resonator sensors (*3) with a diameter of about one centimeter have typically been used, but the development of new sensing technologies that can dramatically improve detection sensitivity and spatial resolution is underway. Sensing technology using mechanical resonators (*2) is attracting particular attention as a simple way to perform measurements and evaluations by inserting a sensor directly into a liquid.
The development of technologies to detect and evaluate the viscosity of liquids and the substances in liquids with high sensitivity is vital for a wide range of use cases spanning the rheology (*1) and biology fields to medical and materials applications. NTT Corporation (President and CEO: Akira Shimada) has developed an ultra-sensitive detection technology utilizing an optical fiber that can measure particles and viscosity at desired locations in liquids.
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