Miniaturized optical viscosity sensor based on a laser-induced capillary wave

Taguchi, Yoshihiro; Ebisui, Akira; Nagasaka, Yuji

doi:10.1088/1464-4258/10/4/044008

Cited by 9 publications

(2 citation statements)

References 11 publications

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“…The signal change due to the viscosity change has been successfully observed (13) . In order to apply this sensor in manufacturing and clinical settings, the distance between the liquid level and the sensor needs to be adjusted appropriately.…”

Section: Introductionmentioning

confidence: 91%

Micro Optical Viscosity Sensor for in situ Measurement Based on a Laser-Induced Capillary Wave

Taguchi

Nagamachi

Nagasaka

2009

JTST

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In this article, we demonstrate a novel micro optical viscosity sensor (MOVS) based on a laser-induced capillary wave with a focus control system that enables in situ monitoring of viscosity and surface tension changes in microliter-order liquid samples such as body fluids, polymer coating materials, lubricants, heavy oils and so on. The microfabricated sensor consists of two deep trenches (depth of 273 µm) holding photonic crystal fibers (PCFs), and three shallow trenches (depth of 125 µm) holding collimating lensed fibers (CLFs) for the probing laser. The capillary wave is excited by two pulsed laser beams generating optical interference, and the rapid motion of the capillary wave, which contains information regarding the viscosity and surface tension of the sample, is monitored by detecting the first-order diffracted beam of the probing laser irradiated onto the sample surface. In order to apply this sensor in manufacturing and clinical settings, the distance between the liquid level and the sensor must be properly adjusted because the sample surface is strongly influenced by evaporation and outside vibration disturbances under such conditions. In the MOVS, the specular reflection of the probing laser is detected by a symmetrically placed collimating lensed fiber. Maximizing the signal of specular reflection by using a piezo stage connected to the MOVS and PID controller, the focal points of the fibers (PCFs and CLFs) are adjusted on the sample surface. The high-reproducible measurement results under evaporation and outside disturbance indicate the validity of MOVS for in situ application.

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Section: Introductionmentioning

confidence: 91%

Micro Optical Viscosity Sensor for in situ Measurement Based on a Laser-Induced Capillary Wave

Taguchi

Nagamachi

Nagasaka

2009

JTST

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“…Previous studies of optical viscosity sensors were conducted by using different optical sensing methods. Experimental data published elsewhere show that the optical viscosity sensing can be based on the use of photodiodes mechanism [1], small angle neutron scattering and dynamic light scattering methods [2], forward light scattering principle [3][4][5][6][7], the laser-induced capillary wave technique [8][9][10], the flow of oil films with gravity method [11,12], a single optical tweezer technique [13], the magneto-acoustic and magneto-optical sensing method [14], and the application of molecular rotors method [15]. The above viscosity sensors have been used to measure only low or medium viscous materials, such as distilled water, bio-fluids, sucrose, glycerol solutions and silicone oils.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Viscosity Using a Long-Period Fiber-Grating-Based Viscometer

Wang

Tang

Chen

et al. 2013

AMR

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This work addresses the comprehensive viscosity measurements and assessment of fluidic materials in the range from 0.01 to 2000 Poises using a fiber optical viscometer with the long-period fiber grating (LPFG) technology. The fluidic materials used and evaluated in this study were AC-20 asphalt cement, four types of silicone oils, and sunflower seed oil. We simultaneously measured the LPFG-induced discharge time and the transmission spectra both in hot air and fluidic materials (other than the AC-20 asphalt) at six different temperatures, i.e., 30, 60, 80, 100, 135, and 170 Celsius. An electromechanical rotational viscometer was also used to measure the viscosities of fluidic materialsthe silicone oils and sunflower seed oil at the above six temperatures. Comparative analysis shows that the LPFG-induced discharge time agreed well with the viscosities obtained from the rotational viscometer. The LPFG-based viscometer was capable of measuring the viscosity (discharge time) in the range from 0.12 to 2000 Poises, which is much wider than the viscosity range of a traditional electromechanical rotational viscometer. This fiber-optic LPFG-based viscometer could be proposed and implemented in the field of road and airfield pavement technology such as the viscosity measurements of asphalt cements, emulsified asphalt binders, and other viscous materials. Hopefully, such a highly sensitive viscometer is suitable for use in various fields of applications, such as civil, food, chemical and biological, mechanical, petroleum, and aerospace engineering.

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A micro-volume viscosity measurement technique based on μPIV diffusometry

Sie

Chuang

2013

Microfluid Nanofluid

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Miniaturized optical viscosity sensor based on a laser-induced capillary wave

Cited by 9 publications

References 11 publications

Micro Optical Viscosity Sensor for in situ Measurement Based on a Laser-Induced Capillary Wave

Micro Optical Viscosity Sensor for in situ Measurement Based on a Laser-Induced Capillary Wave

Measurement of Viscosity Using a Long-Period Fiber-Grating-Based Viscometer

A micro-volume viscosity measurement technique based on μPIV diffusometry

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