In conventional ultrasound detection in structures, a fiber Bragg grating (FBG) is glued on or embedded in the structure. However, application of strain to the structure can influence the sensitivity of the FBG toward ultrasound and can prevent its effective detection. An FBG can work as a strain-insensitive ultrasound sensor when it is not directly glued to the monitored structure, but is inst...

Many proteins have been shown to undergo conformational changes in response to externally applied force in vitro, but whether the force-induced protein conformational changes occur in vivo remains unclear. To reveal the force-induced conformational changes, or strains, within proteins in living cells, we have developed a genetically encoded fluorescent "strain sensor," by combining the proximit...

Skin-strain-field is used as a fingerprint of the human movement to guide design an integrated strain sensor for digital motion recognition.

A novel technique is proposed for measuring the distributed strain and temperature in a fiber with a very high resolution. This technique makes use of the jagged appearance of Rayleigh backscatter traces from a single-mode fiber measured by using a coherent OTDR with a precisely frequency-controlled light source. Our preliminary experiment indicated the possibility of measuring temperature with...

The development of wireless sensor network integrated into aircraft structural health monitoring (SHM) can help to achieve the goal of deploying more sensors for the significant benefits in flexibility, interoperability, mass reduction, system redundancy and enhanced robustness. The objective of this paper is research and development concerning wireless strain gauge sensor node mounted on aircr...

Flexible skin-attachable strain-gauge sensors are an essential component in the development of artificial systems that can mimic the complex characteristics of the human skin. In general, such sensors contain a number of circuits or complex layered matrix arrays. Here, we present a simple architecture for a flexible and highly sensitive strain sensor that enables the detection of pressure, shea...

Wirelessly interrogated surface acoustic wave (SAW) sensors can operate passively and in harsh conditions reliably. The interrogation process of the signal measurement chain provides the power to excite the sensor and hence establish the sensors response in a passive manner. Development of wireless passive SAW sensors allows investigation of their potential to quantify physical measurands such ...

A soft condensed matter sensor (SCMS) designed to measure strains on the human body is presented. The hybrid material based on carbon black (CB) and a thermoplastic elastomer (TPE) was bonded to a textile elastic band and used as a sensor on the human wrist to measure hand motion by detecting the movement of tendons in the wrist. Additionally it was able to track the blood pulse wave of a perso...

We present a fiber-optic Fizeau interferometric strain sensor consisting of an in-fiber spherical microcavity of 39um in diameter. The spherical microcavity was formed by splicing a normal single-mode fiber with a hollow-core photonic crystal fiber. We demonstrate that strain sensing can be realized by using the interference between the light signals reflected by the front and rear surfaces of ...