Assessment of the peripapillary nerve fiber layer and macular thickness can be determined in ophthalmology using optical coherence tomography (OCT). Decreased nerve fiber layer thickness and macular ganglion cell thickness in optic nerve ischemia have been correlated with visual field loss. OCT allows deep optic nerve head evaluation which helps understand pathophysiology of diseases.  Furtherm...

A D-shaped polarization-maintaining fiber (PMF) as fiber optic sensor for the simultaneous monitoring of strain and the surrounding temperature is presented. A mechanical end and edge polishing system with aluminum oxide polishing film is utilized to perform sequential polishing on one side (lengthwise) of the PMF in order to fabricate a D-shaped cross-section. Experimental results show that th...

Fiber optic sensor technology offers the possibility of sensing different parameters like strain, temperature and pressure in harsh environment and remote locations. These kinds of sensors modulate some features of the light wave such as intensity, phase and wavelength in an optical fiber or use optical fiber as a medium for transmitting the measurement information. The advantages of fiber opti...

Fiber Bragg grating (FBG) sensor systems are being widely used as temperature measurement and strain measurement systems for aerospace structures, civil structures, and high rise buildings. However, the systems are rather complicated because the wavelength change must be measured using several kinds of optical filters such as Fabry-Perot filters, edge filters, and bandwidth filters. In this pap...

Although the numerous advantages of polymer optical fibers have been exploited in the fields of sensors and telecommunications, such fibers still experience a critical problem: the temperature dependency. Therefore, we explored the temperature-independent operation of a polymer fiber-optic evanescent wave sensor immersed in distilled water. We investigated variations in the surface morphology, ...

Several possibilities for new fiber-optic sensors are proposed that are based on two-photon spectroscopic techniques. Examples are chemical sensors, including multiplexed sensors, as well as magnetidelectric sensors. The development of a compact, low-cost fiber-optic method for tbe accurate measurement of timdfrequency is also proposed.

We demonstrate a nonlinear fiber-optic strain sensor, which uses the shifts of four-wave mixing Stokes and anti-Stokes peaks caused by the strain-induced changes in the structure and refractive index of a microstructured optical fiber. The sensor thus uses the inherent nonlinearity of the fiber and does not require any advanced postprocessing of the fiber. Strain sensitivity of -0.23 pm/με is a...