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Related Concept Videos

Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
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Related Experiment Video

Updated: Jun 17, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
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Published on: September 16, 2025

A precise apertometer.

P D Carman1

  • 1Division of Applied Physics, National Research Council, Ottawa.

Applied Optics
|January 12, 2010
PubMed
Summary

A new instrument and technique precisely measure microscope objective numerical aperture with 0.0001 accuracy. This offers a significant improvement over traditional commercial apprtometers, enhancing microscopy precision.

Area of Science:

  • Optical instrumentation
  • Microscopy techniques

Background:

  • Accurate measurement of numerical aperture (NA) is crucial for microscopy.
  • Traditional methods for NA measurement lack sufficient precision.

Purpose of the Study:

  • To develop a novel instrument and technique for precise NA measurement.
  • To achieve significantly higher accuracy than existing commercial apprtometers.

Main Methods:

  • Development of a new optical instrument.
  • Implementation of an advanced measurement technique for NA determination.

Main Results:

  • The developed instrument achieves a typical accuracy of 0.0001 for NA measurement.
  • This represents a 100-fold increase in accuracy compared to traditional methods (0.01).

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Conclusions:

  • The new instrument and technique provide a highly accurate method for measuring microscope objective NA.
  • This advancement has the potential to improve image quality and resolution in microscopy.