We demonstrate a fiber-tip photoacoustic spectrometric sensor for trace gas detection. The sensor head is a miniature fiber-tip hollow-cavity with a deflectable polymer diaphragm. Periodic light absorption of gas molecules within the cavity generates an acoustic pressure wave, which causes deflection of the diaphragm. The hollow cavity also is a Fabry-Perot interferometer with which the diaphra...

Two different fiber optic sensors were developed for the determination of hydrogen sulfide at ppb concentration levels; a probe-type fiber optic sensor coated with polyethylene oxide containing 0.5 M CdCl(2) and a fiber optic sensor utilizing 0.5 M CdCl(2)-pretreated filter paper as solid substrate. In the first type, CdCl(2)-polyethyleneoxide (PEO) mixture was coated onto the tip of a fiber op...

The relationship of the vasculature to the neuronal layers was studied in whole-mounts and in sections of macaque retinas. Like other central nervous structures, primate retinas have local variations in vascularity that reflect local variations in metabolism, rather than simply tissue thickness or volume. A special feature of the retina is a dense vascular plexus in the nerve fiber layer, which...

Acoustic emission technology has been applied to many fields for many years. However, the conventional piezoelectric acoustic emission sensors cannot be used in extreme environments, such as those with heavy electromagnetic interference, high pressure, or strong corrosion. In this paper, a novel fiber-optic ring acoustic emission sensor is proposed. The sensor exhibits high sensitivity, anti-el...

In-line fiber optic interferometers have attracted intensive attention for their potential sensing applications in refractive index, temperature, pressure and strain measurement, etc. Typical in-line fiber-optic interferometers are of two types: Fabry-Perot interferometers and core-cladding-mode interferometers. It's known that the in-line fiber optic interferometers based on single-mode fibers...

conclusions in this case, after failure of awake fiberoptic intubation, awake direct laryngoscopy and blind nasal intubation, finally awake nasal intubation in sitting position, using fiberoptic led to success. case presentation the present case discusses a patient with severe deformity of mandible that was admitted for correction with free-flap. the following intubation techniques were used fo...

Spaceborne Fiber Optic Data Bus (SFODB) is an IEEE 1393 compliant, gigabit per second, fiber optic network specifically designed to support the real-time, on-board data handling requirements of remote sensing spacecraft. The network is fault tolerant, highly reliable, and capable of withstanding the rigors of launch and the harsh space environment. SFODB achieves this operational and environmen...

In this paper, we propose a high-bandwidth ring network built up with fiber-ribbon point-to-point links. The network has support for both packet switched and circuit switched traflc. Very high throughputs can be achieved in the network due to pipelining, i.e., several packets can be traveling through the network simultaneously but in different segments of the ring. The network can be built toda...

This paper presents a high-precision transfer system of time and RF frequency via the fiber optic link based on secure encryption. On basis two-way optical fiber, security strategy composed an SM2 encryption algorithm is introduced, which can resist risk information being tampered with. The experimental results show that developed picosecond-precision fiber-optic equipment ensure high stability...

Fiber-optic sensors are highly promising within soft robot sensing applications, but methods based on geometry-based reconstruction limit the capability and range. In this study, a fiber-optic sensor with different deployment strategy for indirect to monitor outside posture of manipulator is presented. The internal support structure’s curvature was measured using FBG sensor, its mapping externa...