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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

587
Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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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.
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Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
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Ratiometric pathlength calibration of integrating sphere-based absorption cells.

S Bergin, J Hodgkinson, D Francis

    Optics Express
    |July 17, 2020
    PubMed
    Summary
    This summary is machine-generated.

    A new calibration technique improves optical pathlength accuracy in integrating spheres for chemical sensors. This method corrects errors caused by contamination, ensuring reliable measurements in challenging environments.

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    Area of Science:

    • Optical sensing technologies
    • Spectroscopy
    • Environmental monitoring

    Background:

    • Optical absorption sensors require precise optical pathlength determination.
    • Integrating spheres offer advantages in pathlength and misalignment tolerance but are susceptible to surface contamination.
    • Contamination degrades the effective pathlength and measurement accuracy.

    Purpose of the Study:

    • To develop and validate an in-situ calibration scheme for integrating spheres.
    • To address the impact of surface contamination on optical pathlength accuracy.
    • To improve the reliability of chemical sensors in dynamic environments.

    Main Methods:

    • A ratiometric two-beam calibration approach was implemented.
    • In-situ calibration was tested on an integrating sphere for methane detection using tunable diode laser spectroscopy (TDLS) at 1651nm.
    • Sphere reflectivity was intentionally reduced using black tape to simulate contamination.

    Main Results:

    • The ratiometric technique significantly reduced measurement errors caused by simulated contamination.
    • For up to 2.3% sphere wall contamination, errors decreased from over 50% to within ±4%.
    • For 2.9% contamination, errors were reduced from 55-65% to within ±11%.

    Conclusions:

    • The proposed in-situ calibration scheme effectively compensates for reduced sphere reflectivity due to contamination.
    • This method enhances the accuracy and reliability of optical absorption sensors utilizing integrating spheres.
    • The technique is particularly valuable for sensors operating in environments prone to dirt or condensation.