scholarly journals Ultraviolet-induced fluorescence of lubricate oils

2015 ◽  
Vol 163 (4) ◽  
pp. 21-25
Author(s):  
Emilia BASZANOWSKA ◽  
Zbigniew OTREMBA
Keyword(s):  
Optical Fiber ◽  
Oil Quality ◽  
Optical Fiber Sensor ◽  
Emission Spectra ◽  
The Other ◽  
Fiber Sensor ◽  
Fluorescence Measurement ◽  
Fiber System ◽  
Preliminary Measurement ◽  
Measurement Results

The paper describes the study on relationship between the engine lubricate oil quality and fluorescence phenomenon. In order to determine the Excitation-Emission spectra (EEMs) of oil samples, a spectrofluorometer combined with an optical fiber system were applied. Two methods of fluorescence measurement: when oil diluted in non-fluorescent solvent (n-hexane) is placed in the quartz-cuvette inside the spectrofluorometer, and when oil sample is placed outside the spectrofluorometer (then EEMs is measured through the optical fiber sensor) were utilized to analyze the shape of EEMs of lubricate oil. Moreover in the second case of measurement, the optical fiber sensor was placed at an angle of 45 degrees to the oil surface, similarly above the oil surface and beneath the oil surface directly submerged in oil. Preliminary measurement results presented in this paper – on one hand – indicate diversity in the shape of EEMs depending on the method of fluorescence measurement, on the other hand – indicate possibility to measure fluorescence of oil directly in engine lubricate oil circuit.

scholarly journals Detection of Mercury Ions in Water using a Plastic Optical Fiber Sensor

2021 ◽  
Vol 4 (2) ◽  
pp. 95
Author(s):  
Willy Hardiantho ◽  
Bidayatul Arminah ◽  
Arifin Arifin
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Output Voltage ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Mercury Ions ◽  
Large Power ◽  
Spiral Spring ◽  
Measurement Results ◽  
Plastic Optical Fibers

Research has been carried out on the detection of mercury ions in water using plastic optical fibers. Detection of mercury ions is done by immersing the optical fiber sensor in the HgCl2 solution, where both ends of the sensor are connected to an LED and a phototransistor. LED as a light source will emit light along with the optical fiber which will be received by the phototransistor. The optical light received by the phototransistor is converted into an electric voltage and given a gain in the differential amplifier. The output voltage in the form of an analog signal is converted into a digital signal on the Arduino UNO so that it can be read on a computer. The optical fiber as a sensor is made in two configurations, namely U configuration and spiral spring configuration. The jacket and the fiber optic cladding are peeled off and then covered with chitosan. Each configuration will be given a variation of the curve to analyze the characteristics of the sensor. The curvature can cause a large power loss resulting in attenuation of the light intensity of the LED received by the phototransistor. Apart from the effect of indentation on optical fibers, the output voltage measurement results are also influenced by the level of HgCl2 concentration. The best measurement results for mercury ion sensors in water using plastic optical fibers are obtained in a spiral spring configuration with a chitosan cladding with a variation of 6 coils which has a sensitivity of 104.065 mV/ppm.

scholarly journals FABRIKASI SENSOR SERAT OPTIK PLASTIK UNTUK DETEKSI ION LOGAM MERKURI DALAM AIR

2019 ◽  
Vol 16 (2) ◽  
pp. 123
Author(s):  
Ida Vaeruza ◽  
Kukuh Eka Kurniansyah ◽  
Faqih Darma ◽  
Ian Yulianti
Keyword(s):  
Heavy Metal ◽  
Optical Fiber ◽  
Water Consumption ◽  
Optical Fiber Sensor ◽  
Dip Coating ◽  
The Other ◽  
Fiber Sensor ◽  
Plastic Optical Fiber ◽  
Mercury Ions ◽  
Dip Coating Technique

The presence of mercury ions is a serious threat to human health and environment. Water consumption containing mercury is very dangerous for human healt. The purpose of this work is to design a heavy metal sensor  ion using plastic optical fiber to detect mercury ions in water. The sensor was fabricated by coating the optical fiber by chitosan through dip-coating technique. There are three diameter of optical fiber sensor that was fabricated, which are 1087.64 μm (sensor A), 1691.64 μm (sensor B) and  1736.33 μm (sensor C). Sensor characterization was done by connected the tip of plastic optical fiber to an LED and the other tip was connected to a photodioda. The results show that sensitivity of sample A is 0.32 mA/ppm, sample B is 0.56 mA/ppm and sample C is 0.64 mA/ppm. In terms of respone time, it is shown that  thr respon time for sensor A, B and C are 22 s, 42.5 s and 86 s respectively.

A Novel Method for onLine Monitoring Engine Oil Quality Based on Tapered Optical Fiber Sensor

2016 ◽  
Vol 16 (10) ◽  
pp. 3551-3555 ◽  
Author(s):  
Reza Taheri Ghahrizjani ◽  
Hossein Sadeghi ◽  
Azardokht Mazaheri
Keyword(s):  
Optical Fiber ◽  
Online Monitoring ◽  
Oil Quality ◽  
Optical Fiber Sensor ◽  
Engine Oil ◽  
Fiber Sensor ◽  
Tapered Optical Fiber ◽  
Novel Method

Detection of Various Damages Based on Piezoceramic Optical Fiber Sensor

2009 ◽  
Vol 413-414 ◽  
pp. 367-372
Author(s):  
Yong Hong ◽  
Gao Ping Wang ◽  
Seung Ho Hwang ◽  
Hyun Sik Kim ◽  
Dong Pyo Hong
Keyword(s):  
Optical Fiber ◽  
Piezoelectric Actuator ◽  
Detection Method ◽  
Optical Fiber Sensor ◽  
Piezoelectric Sensor ◽  
The Other ◽  
Fiber Sensor ◽  
Sensing System ◽  
Ultrasonic Sensing ◽  
Physical Changes

A piezoelectric ultrasonic sensing system based on an optical fiber has been developed for detection of various damages. The ultrasonic wave generated from a piezoelectric actuator is guided and propagated in the optical fiber and then sensed by a piezoelectric sensor located at the other end of the fiber. The sensed signal can be influenced by environmental and physical changes around the optical fiber. In this study, the sensitivity of the optical fiber sensor is experimentally studied. Various patterns of damage, such as cracks, loosen bolts, holes, are more common forms in real structures. In particular, detection method of the damage with respect to various depths of the crack is presented in this paper.

Method of Measuring Tendon Force using Optical Fiber Sensor

2018 ◽  
Vol 56 (1) ◽  
pp. 94-99
Author(s):  
N. Sogabe ◽  
S. Nakaue ◽  
K. Chikiri ◽  
M. Hayakawa
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Tendon Force

scholarly journals Oxygen concentration measurement in the porous cathode of a lithium-air battery using a fine optical fiber sensor

2019 ◽  
Vol 5 (0) ◽  
pp. 19-00095-19-00095
Author(s):  
Shogo FUJIMOTO ◽  
Suguru UEMURA ◽  
Nobuyuki IMANISHI ◽  
Shuichiro HIRAI
Keyword(s):  
Optical Fiber ◽  
Oxygen Concentration ◽  
Optical Fiber Sensor ◽  
Concentration Measurement ◽  
Fiber Sensor ◽  
Porous Cathode ◽  
Air Battery

scholarly journals Measurement Improvement of Distributed Optical Fiber Sensor via Lorenz Local Single Peak Fitting Algorithm

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1166
Author(s):  
Bin Liu ◽  
Jianping He ◽  
Shihai Zhang ◽  
Yinping Zhang ◽  
Jianan Yu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Frequency Shift ◽  
Optical Fiber Sensor ◽  
Gain Spectrum ◽  
Fiber Sensor ◽  
Peak Fitting ◽  
Fitting Algorithm ◽  
Distributed Optical Fiber Sensor ◽  
Brillouin Gain ◽  
Distributed Optical Fiber

Brillouin frequency shift (BFS) of distributed optical fiber sensor is extracted from the Brillouin gain spectrum (BGS), which is often characterized by Lorenz type. However, in the case of complex stress and optical fiber self damage, the BGS will deviate from Lorenz type and be asymmetric, which leads to the extraction error of BFS. In order to enhance the extraction accuracy of BFS, the Lorenz local single peak fitting algorithm was developed to fit the Brillouin gain spectrum curve, which can make the BSG symmetrical with respect to the Brillouin center frequency shift. One temperature test of a fiber-reinforced polymer (FRP) packaged sensor whose BSG curve is asymmetric was conducted to verify the idea. The results show that the local region curve of BSG processed by the developed algorithm has good symmetry, and the temperature measurement accuracy obtained by the developed algorithm is higher than that directly measured by demodulation equipment. Comparison with the reference temperature, the relative measurement error measured by the developed algorithm and BOTDA are within 4% and 8%, respectively.

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