Physical Sensors & Devices

Synchronization is a well-known phenomenon in nonlinear dynamics that is used to lock the frequencies of two oscillators for frequency stabilization applications. The simplest evidence of such frequency entrainment occurs between a self-sustained oscillator and an external tone2, when the latter is swept around the resonance frequency of the oscillator. Synchronization between two oscillators with frequencies related by an integer ratio can occur but requires coupling between the two modes. We present an experimental study of synchronization between two resonance modes of a single...

An estimated 15 million fracture injuries occur each year in the United States. Of these, 10% of fractures result in delayed or non-union, with this number rising to 46% when they occur in conjunction with vascular injury. Current methods of monitoring include taking X-rays and making clinical observations. However, radiographic techniques lag and physician examination of injury is fraught with subjectivity. No standardized methods exist to assess the extent of healing that has taken place in a fracture, revealing the need for a diagnostic device that can reliably detect non-union in...

Some of the 2d and 2d-like carbide exhibit tunable band structure with relatively high conductivity, which provides sensing function for dopants such as gas molecules. 2d-like carbide also has limited phase change induced nanostructure aggregation. With up to 1000K thermal stability, such carbides will be a better fit than other oxide and nitride materials in higher temperature sensing. For certain gases that require combustion sensing, nanostructure 2d-like carbides will be much stable and reliable. 2d-like Molybdenum carbide is three times more sensitive than graphene in response...

As recent developments in noninvasive biosensors spearhead the thrust towards personalized health and fitness monitoring, there is a need for high throughput, cost-effective fabrication of flexible sensing components. Towards this goal, we are working on roll-to-roll (R2R) gravure printed electrode arrays that are robust under a diverse range of electrochemical sensing applications, including detection of ions, metabolites, and heavy metals in human perspiration. R2R printed arrays that are suitable for continuous, in situ use are a key step towards enabling large-scale production of...