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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

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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
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Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
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Design and Implementation of a Ku-Band High-Precision Blackbody Calibration Target.

Jie Liu1, Zhenlin Sun1, Guangmin Sun1

  • 1Faculty of Information Technology, Beijing University of Technology, Beijing 100124, China.

Micromachines
|January 21, 2023
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Summary

A new Ku-Band blackbody calibration target enhances microwave radiometer accuracy for non-contact human tissue temperature measurement. This design optimizes emissivity and uniformity, improving temperature measurement resolution and reliability.

Keywords:
blackbody calibration targetfinite element methodhigh emissivityhigh temperature uniformity

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Area of Science:

  • * Applied electromagnetics and thermal engineering.
  • * Development of precision measurement instrumentation.

Background:

  • * Microwave radiometers offer non-destructive, non-contact human tissue temperature measurement.
  • * Current radiometer accuracy is insufficient for many practical applications.
  • * Existing blackbody calibration targets often address emissivity or uniformity separately, not comprehensively.

Purpose of the Study:

  • * Design and develop a Ku-Band high-precision blackbody calibration target.
  • * Enhance the accuracy and resolution of microwave radiometers.
  • * Achieve high emissivity and temperature uniformity in the calibration target.

Main Methods:

  • * Established electromagnetic scattering and temperature-distribution models using multi-physical simulation and Finite Element Method.
  • * Optimized structural parameters and composition of a coated cone array based on simulation results.
  • * Investigated and compared BP-PID, PSO-PID, and Fuzzy-PID algorithms for optimal temperature control.
  • * Manufactured the target and validated its performance using an arch test system and multi-point temperature distribution measurements.

Main Results:

  • * Optimized design achieved high emissivity and temperature uniformity.
  • * Validated reflectance and indirectly calculated emissivity.
  • * Demonstrated high temperature-distribution uniformity across the target's control panel.
  • * Analyzed the uncertainty of the blackbody calibration target's brightness temperature.

Conclusions:

  • * The designed Ku-Band blackbody calibration target meets requirements for high-accuracy microwave radiometer calibration.
  • * Comprehensive optimization of electromagnetic and thermal characteristics is crucial for effective calibration targets.
  • * Advanced PID tuning algorithms ensure precise temperature control for improved measurement reliability.