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Distance Corrections01:15

Distance Corrections

To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...

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Related Experiment Video

Updated: Jul 14, 2026

In Situ Surface Temperature Measurement in a Conveyor Belt Furnace via Inline Infrared Thermography
07:03

In Situ Surface Temperature Measurement in a Conveyor Belt Furnace via Inline Infrared Thermography

Published on: May 30, 2020

Improving solar ultraviolet irradiance measurements by applying a temperature correction method for Teflon diffusers.

Evelyn Jäkel1, Peter N den Outer, Rick B Tax

  • 1National Institute for Public Health and the Environment (RIVM), Postbus 1, NL-3720 BA Bilthoven, The Netherlands. jaekel@uni-mainz.de

Applied Optics
|June 21, 2007
PubMed
Summary

Accurate surface ultraviolet radiation measurements require temperature corrections for instrument optics. A new method corrects historical data, improving UV radiation trend analysis and instrument comparisons.

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Area of Science:

  • Atmospheric science
  • Radiometry
  • Environmental monitoring

Background:

  • Accurate, long-term surface ultraviolet (UV) radiation measurements are crucial for establishing trends.
  • Modern instruments achieve high accuracy, revealing sensitivity effects from environmental factors like temperature.
  • Entrance optics in UV instruments show sensitivity decreases (0.07-0.1%/°C) with increasing temperature, impacting data integrity.

Purpose of the Study:

  • To develop a method for correcting historical UV radiation data affected by temperature-induced instrument sensitivity changes.
  • To improve the accuracy of long-term UV radiation trend analysis by accounting for temperature variations.
  • To enhance the reliability of UV instrument intercomparisons.

Main Methods:

  • Laboratory measurements quantified the temperature-sensitivity relationship of entrance optics.
  • A novel retrieval method was developed to estimate entrance optics temperatures using pyranometer and meteorological data.
  • This method allows for the correction of historical UV data lacking direct temperature records.

Main Results:

  • The developed temperature retrieval method has an uncertainty of less than 2.5°C.
  • This leads to a 0.3% uncertainty in the applied temperature correction.
  • The temperature correction significantly improves agreement between modeled and measured UV doses.

Conclusions:

  • Temperature-induced sensitivity changes in UV instrument optics necessitate correction for accurate long-term measurements.
  • The developed retrieval method effectively corrects historical data, enhancing UV trend analysis.
  • The method is transferable to other instruments, supporting broader UV measurement quality assurance.