meter-thick optode membrane is a common problem in optic-fiber sensor design. Many methods have been published for slowing down the leaching process. Covalent binding of dye molecules on suitable matrices is one of the most efficient immobilization methods.1–7 Recently, we have described a new optic-fiber sensor for tetracycline antibiotics based on covalently immobilized anthracene.8 A distinc...

A novel probe-type FPI-based fiber optic hydrogen sensor with a graphene–Au–Pd sandwich structure film and FBG is proposed experimentally demonstrated in this study.

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...

The design and development of a plastic optical fiber (POF) macrobend temperature sensor is presented. The sensor has a linear response versus temperature at a fixed bend radius, with a sensitivity of . The sensor system used a dummy fiber-optic sensor for reference purposes having a resolution below 0.3 °C. A comprehensive experimental analysis was carried out to provide insight into the effec...

Buried Fiber Optic Intrusion Sensor. (May 2004) Eric William Maier, B.S., Texas A&M University Chair of Advisory Committee: Dr. Henry Taylor A distributed fiber optic intrusion sensor capable of detecting intruders from the pressure of their weight on the earth’s surface was investigated in the laboratory and in field tests. The presence of an intruder above or in proximity to the buried sensor...

Surface plasmon resonance (SPR) sensor is widely used for its high precision and real-time analysis. Fiber-optic SPR sensor is easy for miniaturization, so it is commonly used in the development of portable detection equipment. It can also be used for remote, real-time, and online detection. In this study, a wavelength modulation fiber-optic SPR sensor is designed, and theoretical analysis of o...

A universal pH indicator is used to fabricate a fiber optic ammonia sensor. The advantage of this pH indicator is that it exhibits sensitivity to ammonia over a broad wavelength range. This provides a differential response, with a valley around 500 nm and a peak around 650 nm, which allows us to perform ratiometric measurements. The ratiometric measurements provide not only an enhanced signal, ...

Aircraft operators are faced with increasing requirements to extend the service life of air platforms beyond their designed life cycles, resulting in heavy maintenance and inspection burdens as well as economic pressure. Structural health monitoring (SHM) based on advanced sensor technology is potentially a cost-effective approach to meet operational requirements, and to reduce maintenance cost...