Refractive-index measurement based on the effects of total internal reflection and the uses of heterodyne interferometry

Chiu, Ming Horng; Lee, Ju Yi; Su, Der Chin

doi:10.1364/ao.36.002936

Cited by 68 publications

(27 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The number of total-internal-reflections is m ϭ 2 L/d. Hence, according to Fresnel's equations [6], the phase difference between s-and p-polarizations due to multiple total-internal-reflections is…”

Section: The Phase Difference Variation Resulted From the Variation Omentioning

confidence: 99%

See 1 more Smart Citation

Vacuum measurement using total-internal-reflection heterodyne interferometry

Chiu

Lee

et al. 1999

Precision Engineering

Self Cite

View full text Add to dashboard Cite

Based on the effect that the phase difference between s-and p-polarizations at the total-internal-reflection is changed with the variation of the air refractive index, which is related to the air pressure, a new optical method for measuring the air pressure of a vacuum cavity is proposed. From the experimental curve of the phase difference variation measured by the heterodyne interferometry and the calibrated pressure measurement of a vacuum cavity, an empirical formula is derived. With this empirical formula, the measurable range of this new optical method is 760 to 0.1 torr.

show abstract

Section: The Phase Difference Variation Resulted From the Variation Omentioning

confidence: 99%

“…Chiu et al [6] proposed a method for measuring the refractive index by using the total-internal-reflection heterodyne interferometry. The schematic diagram of the optical arrangement of our method, which is based on a similar consideration, is shown in Fig.…”

Section: Phase Difference Variation Measurements With the Total-intermentioning

confidence: 99%

Vacuum measurement using total-internal-reflection heterodyne interferometry

Chiu

Lee

et al. 1999

Precision Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Similarly, in food processing and pharmaceutical industries it is often required to monitor refractive indices of various solutions as it conveys important information to the manufacturer. Over the years there has been a great deal of interest in monitoring liquid refractive index using fibre-optic (FO) sensors [1][2][3][4][5]. Compared to conventional refractometers such as Abbe refractometer, fibre-optic refractometer offers three major advantages.…”

Section: Introductionmentioning

confidence: 99%

Non-intrusive refractometer sensor

Nath

2010

Pramana - J Phys

View full text Add to dashboard Cite

An experimental realization of a simple non-intrusive refractometer sensor is demonstrated in this communication. The working principle of the sensor is based on intensity modulation of the back-reflected light when output light from an optical fibre end focusses onto air-medium interface. The change in the refractive index of the medium affects the reflectance of the incident light signal and thus modulates the back-reflected signal. Refractive index variation as small as 0.002 RIU can be measured using the present technique. The advantages of the technique are its simplicity, cost efficiency and usefulness in monitoring refractive indices of acidic solutions.

show abstract

“…Since the discovery of TIR of light in 1800's by John Tyndall [8], the TIR principle has been employed in several applications including a fiber-optic communication system, an optical switch [9][10], an optical beam deflector [11], a fiber-optic hydrophone [12], an interferometer [13][14], a fiber-optic sensor [15], the measurement of refractive index [16][17], spectroscopy [18], a fingerprint input device [19][20], and microscopy [21]. Recently, a user friendly TIR-based optical touch switch was also proposed and successfully demonstrated [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Light-scattering-based high contrast optical touch sensor architectures in transmissive and reflective configurations

Sumriddetchkajorn

Amarit

2005

SPIE Proceedings

View full text Add to dashboard Cite

Transmissive and reflective optical touch switch architectures based on the use of light scattering are proposed. Key features include high ON/OFF switching ratio, tunable sensitivity, ease of implementation, and no leakage optical beam incident on the user. Experimental proof of concept using a visible laser diode and a plastic Dove prism arranged in the transmissive configuration shows a high 24.4 dB contrast ratio which is a hundred times higher than obtained in the previous total internal reflection-based optical touch switch. In addition, switching response in milliseconds is also investigated for both lifting and sliding the fingertip out of the touching surface of the optical touch switch. Our light scattering-based optical touch switch also supports multiple keystroke operation.

show abstract

Refractive-index measurement based on the effects of total internal reflection and the uses of heterodyne interferometry

Cited by 68 publications

References 15 publications

Vacuum measurement using total-internal-reflection heterodyne interferometry

Vacuum measurement using total-internal-reflection heterodyne interferometry

Non-intrusive refractometer sensor

Light-scattering-based high contrast optical touch sensor architectures in transmissive and reflective configurations

Contact Info

Product

Resources

About