Publication

Method and device for measuring the optical properties of transparent and/or diffusive objects

2002
Patents

Abstract

The inventive method for measuring the optical properties of transparent and/or diffusive objects (18), especially their reflection profile, uses two coupled interferometers. Said coupled interferometers are operated with two beams of different coherence lengths. The object to be measured (18) is exposed to the beam with the short coherence length. A path length variation unit (15) is located in the common branch of the two interferometers. This unit impresses a double frequency on both beams, and this double frequency is then evaluated. A device for carrying out the method can be used especially as a reflectometer, preferably for applications in the area of surface diagnosing, optical tomography and photometry, as a high-dynamic means of determining optical properties with a high signal-noise ratio.

Official source

https://infoscience.epfl.ch/entities/publication/8fc3d5f4-ecf6-42f2-82e5-30ed678350b4

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2002
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/8fc3d5f4-ecf6-42f2-82e5-30ed678350b4

About this result

Related concepts (29)

Optical coherence tomography

Optical coherence tomography (OCT) is an imaging technique that uses low-coherence light to capture micrometer-resolution, two- and three-dimensional images from within optical scattering media (e.g., biological tissue). It is used for medical imaging and industrial nondestructive testing (NDT). Optical coherence tomography is based on low-coherence interferometry, typically employing near-infrared light. The use of relatively long wavelength light allows it to penetrate into the scattering medium.

Coherence (physics)

In physics, coherence expresses the potential for two waves to interfere. Two monochromatic beams from a single source always interfere. Physical sources are not strictly monochromatic: they may be partly coherent. Beams from different sources are mutually incoherent. When interfering, two waves add together to create a wave of greater amplitude than either one (constructive interference) or subtract from each other to create a wave of minima which may be zero (destructive interference), depending on their relative phase.

Coherence length

In physics, coherence length is the propagation distance over which a coherent wave (e.g. an electromagnetic wave) maintains a specified degree of coherence. Wave interference is strong when the paths taken by all of the interfering waves differ by less than the coherence length. A wave with a longer coherence length is closer to a perfect sinusoidal wave. Coherence length is important in holography and telecommunications engineering. This article focuses on the coherence of classical electromagnetic fields.

Related publications (20)

Method and device for measuring the optical properties of transparent and/or diffusive objects

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