Time-shift technique for simultaneous measurement of size, velocity, and relative refractive index of transparent droplets or particles in a flow

2014 ◽  
Vol 53 (4) ◽  
pp. 588 ◽  
Author(s):  
Walter Schäfer ◽  
Cameron Tropea
Keyword(s):  
Refractive Index ◽  
Simultaneous Measurement ◽  
Time Shift ◽  
Relative Refractive Index ◽  
Shift Technique

Application of the turbidity ratio method in the spherical particle size determination in the range m ∈ and α ∈

1979 ◽  
Vol 44 (7) ◽  
pp. 2064-2078 ◽  
Author(s):  
Blahoslav Sedláček ◽  
Břetislav Verner ◽  
Miroslav Bárta ◽  
Karel Zimmermann
Keyword(s):  
Refractive Index ◽  
Spherical Particle ◽  
Ratio Method ◽  
Refractive Indices ◽  
Relative Refractive Index ◽  
Particle Size Determination ◽  
The Individual ◽  
The Given ◽  
Turbidity Ratio ◽  
Selection Of

Basic scattering functions were used in a novel calculation of the turbidity ratios for particles having the relative refractive index m = 1.001, 1.005 (0.005) 1.315 and the size α = 0.05 (0.05) 6.00 (0.10) 15.00 (0.50) 70.00 (1.00) 100, where α = πL/λ, L is the diameter of the spherical particle, λ = Λ/μ1 is the wavelength of light in a medium with the refractive index μ1 and Λ is the wavelength of light in vacuo. The data are tabulated for the wavelength λ = 546.1/μw = 409.357 nm, where μw is the refractive index of water. A procedure has been suggested how to extend the applicability of Tables to various refractive indices of the medium and to various turbidity ratios τa/τb obtained with the individual pairs of wavelengths λa and λb. The selection of these pairs is bound to the sequence condition λa = λ0χa and λb = λ0χb, in which b-a = δ = 1, 2, 3; a = -2, -1, 0, 1, 2, ..., b = a + δ = -1, 0, 1, 2, ...; λ0 = λa=0 = 326.675 nm; χ = 546.1 : 435.8 = 1.2531 is the quotient of the given sequence.

scholarly journals Hybrid Grating in Reduced-Diameter Fiber for Temperature-Calibrated High-Sensitivity Refractive Index Sensing

2019 ◽  
Vol 9 (9) ◽  
pp. 1923
Author(s):  
Biqiang Jiang ◽  
Zhen Hao ◽  
Dingyi Feng ◽  
Kaiming Zhou ◽  
Lin Zhang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Simultaneous Measurement ◽  
Surrounding Medium ◽  
High Sensitivity ◽  
Fiber Grating ◽  
Bragg Resonance ◽  
Core Mode ◽  
Promising Alternative ◽  
Sensing Applications ◽  
Highly Sensitive

We propose and experimentally demonstrate a hybrid grating, in which an excessively tilted fiber grating (Ex-TFG) and a fiber Bragg grating (FBG) were co-inscribed in a reduced-diameter fiber (RDF). The hybrid grating showed strong resonances due to coupling among core mode and a set of polarization-dependent cladding modes. This coupling showed enhanced evanescent fields by the reduced cladding size, thus allowing stronger interaction with the surrounding medium. Moreover, the FBG’s Bragg resonance confined by the thick cladding was exempt from the change of the surrounding medium’s refractive index (RI), and then the FBG can work as a temperature compensator. As a result, the Ex-TFG in RDF promised a highly sensitive RI measurement, with a sensitivity up to ~1224 nm/RIU near the RI of 1.38. Through simultaneous measurement of temperature and RI, the temperature dependence of water’s RI is then determined. Therefore, the proposed hybrid grating with a spectrum of multi-peaks embedded with a sharp Bragg resonance is a promising alternative for the simultaneous measurement of multi-parameters for many RI-based sensing applications.

scholarly journals Spray measurements with the time-shift technique

2021 ◽  
Author(s):  
Walter Schäfer ◽  
Cameron Tropea ◽  
Georg Wigger ◽  
Dirk Eierhoff
Keyword(s):  
Time Shift ◽  
Shift Technique

Simultaneous Measurement of Refractive Index and Temperature Based on Optical Fiber Cavity Sensor

2016 ◽  
Vol 45 (3) ◽  
pp. 306003
Author(s):  
时菲菲 SHI Fei-fei ◽  
赵春柳 ZHAO Chun-liu ◽  
徐贲 XU Ben ◽  
王东宁 WANG Dong-ning
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Simultaneous Measurement

Simultaneous measurement of temperature and refractive index with F–P microcavity sensor based on graded-index few mode fiber

2020 ◽  
Vol 455 ◽  
pp. 124577 ◽  
Author(s):  
Xinghu Fu ◽  
Lianxu Liu ◽  
Shuming Huang ◽  
Guangwei Fu ◽  
Wa Jin ◽  
...  
Keyword(s):  
Refractive Index ◽  
Simultaneous Measurement ◽  
Graded Index
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