Distributed fiber optic chemical sensor with a temperature compensation mechanism

2020 ◽  
Author(s):  
Fei Lu ◽  
Ping Lu ◽  
Mudabbir Badar ◽  
Ruishu F. Wright ◽  
Michael P. Buric
Keyword(s):  
Temperature Compensation ◽  
Chemical Sensor ◽  
Fiber Optic ◽  
Compensation Mechanism

Tunable Athermal Multi-FBG Package Using a Bending Bimetal Structure

2000 ◽  
Vol 124 (1) ◽  
pp. 54-59 ◽  
Author(s):  
Samuel I-En Lin
Keyword(s):  
Temperature Compensation ◽  
Fiber Optic ◽  
Compensation Mechanism ◽  
Central Wavelength ◽  
Experimental Procedure ◽  
The Core ◽  
System A ◽  
Stable Temperature ◽  
Fiber Optic Communication ◽  
Optic Communication

The Fiber Bragg Gratings (FBGs) written by ultraviolet light into the core of an optical fiber have developed into a critical component for many applications in the fiber-optic communication system. A stable temperature compensation mechanism is essential to the successful usage of FBG-based devices. In this paper, the bimetal-based temperature-compensating package with tunable mechanism was developed. Such a tunable mechanism serves as prestress and post-tuning mechanisms of fixture in order to obtain a predetermined central wavelength. With the aid of developed experimental procedure, this compact and easily manufactured package can achieve temperature coefficient of 8.3×10−4 nm/°C in the temperature range from −40°C to 80°C. The same package can also be used for multi-FBG applications.

scholarly journals Fiber-Optic Time-Resolved Fluorescence Sensor for in Vitro Serotonin Determination

1993 ◽  
Vol 47 (5) ◽  
pp. 590-597 ◽  
Author(s):  
Stephane Mottin ◽  
Canh Tran-Minh ◽  
Pierre Laporte ◽  
Raymond Cespuglio ◽  
Michel Jouvet
Keyword(s):  
Chemical Sensor ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Excitation Wavelength ◽  
Nitrogen Laser ◽  
Time Resolved ◽  
Temporal Effects ◽  
Starting Point

At pH 7 and with the excitation at wavelengths above 315 nm, previously unreported fluorescence of 5-HT (5-hydroxytryptamine) is observed. Two fluorescence bands were observed for 5-HT; the first emits at around 390 nm with an associated lifetime near 1 ns, and the other (well known) emits at 340 nm with an associated lifetime of 2.7 ns. With both static and time-resolved fluorescences, the spectral and temporal effects of the excitation wavelength were studied between 285 and 340 nm. With these basic spectroscopic properties as a starting point, a fiber-optic chemical sensor (FOCS) was developed in order to measure 5-HT with a single-fiber configuration, nitrogen laser excitation, and fast digitizing techniques. Temporal effects including fluorescence of the optical fiber were studied and compared with measurements both directly in cuvette and through the fiber-optic sensor. Less than thirty seconds are required for each measurement. A detection limit of 5-HT is reached in the range of 5 μM. Our system, with an improved sensitivity, could therefore be a possible and convenient “tool” for in vivo determination of 5-HT.

scholarly journals FIBER-OPTIC CHEMICAL SENSOR USING VISIBLE SEMICONDUCTOR LASER AND PLASTICIZED POLY (VINYL CHLORIDE) MEMBRANE

1991 ◽  
Vol 7 (Supple) ◽  
pp. 1465-1468 ◽  
Author(s):  
YUJI KAWABATA ◽  
KEN-ICHI YASUNAGA ◽  
TOTARO IMASAKA ◽  
NOBUHIKO ISHIBASHI
Keyword(s):  
Semiconductor Laser ◽  
Vinyl Chloride ◽  
Chemical Sensor ◽  
Fiber Optic ◽  
Poly Vinyl Chloride

Interferometric Fiber-Optic Electric Current Sensor for Industrial Application

2010 ◽  
Vol 437 ◽  
pp. 314-318 ◽  
Author(s):  
Nikolay I. Starostin ◽  
Maksim V. Ryabko ◽  
Yurii K. Chamorovskii ◽  
Vladimir P. Gubin ◽  
Aleksandr I. Sazonov ◽  
...  
Keyword(s):  
Electric Current ◽  
Industrial Application ◽  
Temperature Compensation ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Current Sensor ◽  
Sensor Output ◽  
Optic Sensor ◽  
Spun Fiber ◽  
Fiber Coil

The interferometric electric current fiber-optic sensor for application in industry is presented. The modified spun fiber is used for sensitive fiber coil of sensor. The sensor has accuracy of 0.5% at temperature range from -40°C to 60°C without necessity of additional temperature compensation. The range of measured current is 15 – 250 kA. A frequency band is 0 – 5000 Hz and a nonlinearity of a sensor output is ±0.15%.

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