&lt;title&gt;Fiber optic pressure and temperature sensors for oil down hole application&lt;/title&gt;

Qi, Bing; Pickrell, Gary; Zhang, Po; Duan, Yuhong; Peng, Wei; Xu, Juntao; Huang, Zhengyu; Deng, Jiangdong; Xiao, Hai; Wang, Zhiyong; Huo, Wei; May, Russell G.; Wang, Anbo

doi:10.1117/12.456071

Cited by 38 publications

(22 citation statements)

References 4 publications

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“…A low-finesse FP cavity can be formed directly by the cleaved end faces of the lead-in fiber and a reflection fiber [136]. As shown in Figure 2.1, the lead-in fiber and the reflection fiber can be bonded together by silica capillary tubing.…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, an EFPI sensor uses an air cavity between two cleaved fiber ends inserted into an alignment ferrule and bonded by laser welding or epoxy adhesive [136,137]. The FP cavity can also be fabricated by splicing silica capillary tubing (or hollow core fiber)…”

Section: Introductionmentioning

confidence: 99%

“…As shown in Figure 2.1, the lead-in fiber and the reflection fiber can be bonded together by silica capillary tubing. By selecting silica tubing with different diameters, two types of FFPI sensors can be fabricated by laser bonding [136] [ In this chapter, the fabrication of a tubing-based multicavity FP sensor is described. By cleaving the reflection fiber of the hybrid sensor, a second fiber cavity can be formed in addition to the single air-cavity of conventional FP sensors, which is similar to the diaphragm cavity in a pressure FP sensor [135].…”

Section: Introductionmentioning

confidence: 99%

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Miniature fiber-optic multicavity Fabry–Perot interferometric biosensor

et al. 2005

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(ABSTRACT)Fiber-optic Fabry-Perot interferometric (FFPI) sensors have been widely used due to their high sensitivity, ease of fabrication, miniature size, and capability for multiplexing. However, direct measurement of self-assembled thin films, receptor immobilization process or biological reaction is limited in the FFPI technique due to the difficulty of forming Fabry-Perot cavities by the thin film itself. Novel methods are needed to provide an accurate and reliable measurement for monitoring the thin-film growth in the nanometer range and under various conditions. In this work, two types of fiber-optic multicavity Fabry-Perot interferometric (MFPI) sensors with built-in temperature compensation were designed and fabricated for thin-film measurement, with applications in chemical and biological sensing. Both the tubing-based MFPI sensor and microgap MFPI sensor provide simple, yet high performance solutions for thin-film sensing. The temperature dependence of the sensing cavity is compensated by extracting the temperature information from a second multiplexed cavity. This provides the opportunity to examine the thin-film characteristics under different environment temperatures.To demonstrate the potential of this structure for practical applications, immunosensors were fabricated and tested using these structures. Self-assembled polyelectrolytes served as a precursor film for immobilization of antibodies to ensure they retain their biological activity. This not only provides a convenient method for protein immobilization but also presents the possibility of increasing the binding capacity

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Miniature fiber-optic multicavity Fabry–Perot interferometric biosensor

et al. 2005

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“…sensors have been widely used in temperature, pressure and chemical measurements [36][37][38][39][40][41][42][43][44]. This kind of sensors possess a series of characteristics such as compactness, lightweight, and generally immunity to electromagnetic interference ( EMI) [1].…”

Section: Application Of Fabry-perot Sensorsmentioning

confidence: 99%

Microgap Structured Optical Sensor for Fast Label-Free DNA Detection

Wang

Cooper

Wang

2008

J. Lightwave Technol.

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DNA detection technology has developed rapidly due to its extensive application in clinical diagnostics, bioengineering, environmental monitoring, and food science areas.Currently developed methods such as surface Plasmon resonance (SPR) methods, fluorescent dye labeled methods and electrochemical methods, usually have the problems of bulky size, high equipment cost and time-consuming algorithms, so limiting their application for in vivo detection. In this work, an intrinsic Fabry-Perot interferometric (IFPI) based DNA sensor is presented with the intrinsic advantages of small size, low cost and corrosion-tolerance. This sensor has experimentally demonstrated its high sensitivity and selectivity.In theory, DNA detection is realized by interrogating the sensor's optical cavity length variation resulting from hybridization event. First, a microgap structure based IFPI sensor is fabricated with simple etching and splicing technology. Subsequently, considering the sugar phosphate backbone of DNA, layer-by-layer electrostatic self-assembly technique is adopted to attach the single strand capture DNA to the sensor endface. When the target DNA strand binds to the single-stranded DNA successfully, the optical cavity length of sensor will be increased. Finally, by demodulating the sensor spectrum, DNA hybridization event can be judged qualitatively.This sensor can realize DNA detection without attached label, which save the experiment expense and time. Also the hybridization detection is finished within a few minutes.This quick response feature makes it more attractive in diagnose application. Since the iii sensitivity and specificity are the most widely used statistics to describe a diagnostic test, so these characteristics are used to evaluate this biosensor. Experimental results demonstrate that this sensor has a sensitivity of 6nmol/ml and can identify a 2 bp mismatch. Since this sensor is optical fiber based, it has robust structure and small size ( 125μm ). If extra etching process is applied to the sensor, the size can be further reduced. This promises the sensor potential application of in-cell detection. Further investigation can be focused on the nanofabrication of this DNA sensor, and this is very meaningful topic not only for diagnostic test but also in many other applications such as food industry, environment monitoring.iv Acknowledgement

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“…A multimode fiber optic white light interferometric system [11] is used for the optoelectronics signal detection and processing. Based on the strain principle of cantilever beams [12], flow rate measurement can be achieved by detecting the air-gap changes from two fiber sensors caused by the bending of the cantilever beam.…”

Section: Principlementioning

confidence: 99%

Novel single-phase fiber optic flow sensor system

Peng

Pickrell

et al. 2004

SPIE Proceedings

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In this paper, we present a novel design of a fiber optic flow sensor system for single-phase fluid flow detection. This new system is based on the principle of broadband interferometry and cantilever beam bending. The fiber optic sensor system utilizes two fiber ferrule sensors that are bonded on both sides of a cantilever beam. The flow rate can be determined by monitoring the air gap changes caused by bending of the cantilever beam. Cross-sensitivity of the temperature and pressure dependence of the sensor can be compensated for automatically. The prototype sensor system was fabricated and tested on the lab-scale with preliminary evaluations completed. Field-testing was performed in the indoor and outdoor flow loops of Tulsa University in Tulsa, Okalahoma. Both the lab-scale and field-testing results verified that the designed flow sensor system could measure the single-phase fluid flow rate with high resolution and repeatability by compensating the thermal and pressure effects of the environment. The outdoor field-testing demonstrated the feasibility of the designed fiber optic flow sensor for single-phase fluid flow rate measurements in the oil fields.

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<title>Fiber optic pressure and temperature sensors for oil down hole application</title>

Cited by 38 publications

References 4 publications

Miniature fiber-optic multicavity Fabry–Perot interferometric biosensor

Miniature fiber-optic multicavity Fabry–Perot interferometric biosensor

Microgap Structured Optical Sensor for Fast Label-Free DNA Detection

Novel single-phase fiber optic flow sensor system

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