Development of the single-tip optical fiber probe fabricated by femto-second pulse laser for the high-speed droplets/bubbles measurement

2017 ◽  
Vol 2017 (0) ◽  
pp. J0510301
Author(s):  
Hiromu SHIMIZU ◽  
Takayuki SAITO
Keyword(s):  
Optical Fiber ◽  
Pulse Laser ◽  
High Speed ◽  
Fiber Probe ◽  
Optical Fiber Probe

Newly Developed Two-Tip Optical-Fiber Probe for Accurate Measurement of High-Speed Micro-Droplets: Simultaneous Measurement of Their Velocities and Diameters

2009 ◽  
Author(s):  
Keisuke Matsuda ◽  
Yusuke Ozawa ◽  
Takayuki Saito
Keyword(s):  
Optical Fiber ◽  
High Velocity ◽  
High Speed ◽  
Video Camera ◽  
Medium Size ◽  
Fiber Probe ◽  
Optical Fiber Probe ◽  
High Speed Video ◽  
Ultra High Speed ◽  
High Speed Video Camera

Optical fiber probing is very useful and reliable for bubbles/droplets measurement particularly in the gas-liquid two-phase flows that have dense dispersed phase and are impossible to be measured via usual visualization techniques. For the practical purpose of small- or medium-size bubbles/droplets measurement, one of the authors successfully developed a Four-Tip Optical-fiber Probe (F-TOP) and reported their excellent performance in industrial uses. Recently, particular demands for measuring properties of micro bubbles/droplets have increased in researches on multi-phase flows. However, no one succeeded in simultaneously measuring diameters and velocities of high-speed micro-droplets (velocity > 50 m/s; 50 μm < diameter < 500 μm). We made a challenge of measuring such tiny droplets via newly developed optical fiber probe equipped with two tips (Two-Tip Optical-fiber Probe: T-TOP). We have succeeded in this difficult measurement with it. Each optical fiber probe composing the T-TOP is made of a silica optical fiber (125 μm in external diameter, 50 μm in core diameter, 37.5 μm in clad thickness). The optical fiber was fine-drawn using a micro pipette puller, and this yielded a sub-μm-scale tip. The interval of the fiber axes and the gap of the tips were arranged depending on the droplets diameter range. In this paper, we demonstrate the performance of the T-TOP. First, we confirm its practicality in industrial use. The strength of the T-TOP is confirmed by exposure test of high-velocity and high-temperature steam flows. Second, we consider the influence of the flow on the measurement of T-TOP; the optical noise due to probe vibration by the high-velocity gas flow around the T-TOP is considered. Next, we confirm its performance using an orifice-type nozzle (300 μm < droplets diameter < 500 μm; droplets velocities < 40 m/s). We confirm the performance of the T-TOP; the results of T-TOP are compared with those of the visualization of the droplets by using an ultra-high-speed video camera. At the same time, we consider the process of droplet contact with the T-TOP via visualization of ultra-high-speed video camera.

345 Developing a measurement technique of micro bubbles and droplets using an Optical Fiber Probe processed by Femtosecond Pulse Laser

2008 ◽  
Vol 2008.8 (0) ◽  
pp. 89-90
Author(s):  
Yusuke OZAWA ◽  
Keisuke MATSUDA ◽  
Shingo OISHI ◽  
Shin-ichiro AOSHIMA ◽  
Toshiyuki SANADA ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Pulse Laser ◽  
Measurement Technique ◽  
Femtosecond Pulse ◽  
Fiber Probe ◽  
Femtosecond Pulse Laser ◽  
Optical Fiber Probe

scholarly journals Displacement Measurement for High Speed Tribological Measurement Using Oscillating Optical Fiber Probe

2010 ◽  
Vol 4 (1) ◽  
pp. 2-14 ◽  
Author(s):  
Shintaro ITOH ◽  
Koki IMAI ◽  
Kenji FUKUZAWA ◽  
Yuya HAMAMOTO ◽  
Hedong ZHANG
Keyword(s):  
Optical Fiber ◽  
High Speed ◽  
Displacement Measurement ◽  
Fiber Probe ◽  
Optical Fiber Probe

Bubbles and Droplets Measurement via Optical Fiber Probe Processed by Femtosecond Pulse Laser

2008 ◽  
Author(s):  
Takayuki Saito ◽  
Yusuke Ozawa ◽  
Keisuke Matsuda ◽  
Shin-Ichiro Aoshima
Keyword(s):  
Light Intensity ◽  
Optical Fiber ◽  
Pulse Laser ◽  
Simultaneous Measurement ◽  
Femtosecond Pulse ◽  
Detection Characteristic ◽  
Fiber Probe ◽  
Femtosecond Pulse Laser ◽  
Optical Fiber Probe ◽  
Reflected Light

An optical fiber has interesting and useful characteristics, which are able to be applied to scientific measurement. Its phase detection characteristic based on refraction difference between two phases is applied to bubbles/droplets measurement. Recently, demands for measurement of tiny bubbles/droplets increase in research fields of steam injectors, sprays, automotive engines, fine chemical reactors, and so on. Meanwhile, laser science and engineering, particularly femtosecond pulse laser, has made remarkable advances lately. Their unique properties of the interaction between the femtosecond pulses and materials can be utilized for microfabrication. The optical fiber probe methods have been repeatedly improved in order to measure bubbles/droplets efficiently and reliably in gas-liquid two-phase flows. However, one has been taking it for granted that simultaneous measurement of their diameters and velocities needs at least two optical fiber probes. To break through this situation, we newly developed a Single-Tip Optical Fiber Probe (F-STOP) microfabricated by femtosecond pulse laser (fs-pulses) which realizes simultaneous measurement of diameters and velocities of tiny bubbles/droplets. In the F-STOP measurement, the following properties are used to realize the simultaneous measurement of diameters and velocities of bubbles/droplets: the relation between the reflected-light intensity at the wedge-shaped probe tip and the tip-surface area covered with a phase; reflected-light intensity at the groove microfabricated by fs-pulses. The first aim of the present study is to provide data for evaluation of the influences of surface tension and wettability on the bubble measurement in order to develop precise and reliable F-STOP method. The second aim is to describe the process to make F-STOP via fs-pulses. The third aim is demonstration of the newly developed probe in real measurement of bubbles/droplets. On the basis of these, the performance of the new probe is discussed.

Dual-parameter optical fiber probe based on a three-beam Fabry-Perot interferometer

2020 ◽  
pp. 1-1
Author(s):  
Wen Zhang ◽  
Haoye Li ◽  
Lianqing Zhu ◽  
Mingli Dong ◽  
Fanyong Meng
Keyword(s):  
Optical Fiber ◽  
Fiber Probe ◽  
Optical Fiber Probe ◽  
Fabry Perot

scholarly journals Infrared Hollow Optical Fiber Probe for Localized Carbon Dioxide Measurement in Respiratory Tracts

Sensors ◽  
2018 ◽  
Vol 18 (4) ◽  
pp. 995 ◽  
Author(s):  
Takashi Katagiri ◽  
Kyosuke Shibayama ◽  
Takeru Iida ◽  
Yuji Matsuura
Keyword(s):  
Carbon Dioxide ◽  
Optical Fiber ◽  
Fiber Probe ◽  
Optical Fiber Probe ◽  
Carbon Dioxide Measurement
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