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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
08:12

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

Liquid refractometer based on immersion diffractometry.

Sheng-Hua Lu, Shang-Peng Pan, Tzong-Shi Liu

    Optics Express
    |June 24, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A new laser refractometer measures liquid refractive index using a rotating grating and diffraction angles. This method simplifies measurements and achieves high accuracy, around 0.003 for refractive index 1.3.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Accurate measurement of liquid refractive index is crucial for various scientific and industrial applications.
    • Existing refractometry methods can be complex, requiring specialized cells and intricate alignment procedures.

    Purpose of the Study:

    • To develop and present a novel laser diffractometric refractometer for simplified and accurate refractive index determination of liquids.
    • To demonstrate the feasibility and precision of the proposed refractometry technique.

    Main Methods:

    • Utilizes a laser diffractometric approach with a rotating reflection grating immersed in the liquid.
    • Measures the first-order Littrow diffraction angle, detected via an interferogram formed by diffracted and reflected beams.
    • Eliminates the need for specialized liquid cells, simplifying the experimental setup.

    Main Results:

    • The proposed laser refractometer allows for straightforward alignment and measurement processes compared to conventional refractometers.
    • Feasibility experiments demonstrated a high accuracy of approximately 0.003 for a refractive index around 1.3.
    • The technique successfully measures the refractive index without requiring a dedicated liquid cell.

    Conclusions:

    • The laser diffractometric refractometer offers a simplified, accurate, and efficient method for determining liquid refractive indices.
    • This innovative approach has the potential to replace or augment existing refractometry techniques in various fields.
    • Further research could explore its application across a wider range of liquids and refractive index values.