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Related Experiment Video

Updated: Jul 8, 2026

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements

Published on: July 19, 2016

Copper disk pyrheliometer of high accuracy.

C K Hsieh¹, X A Wang

¹University of Florida, Mechanical EngineeringDepartment, Thermal Radiation Laboratory, Gainesville, Florida3 2611, USA.

|January 1, 1983

Summary

A novel copper disk pyrheliometer accurately measures solar radiation by analyzing sensor heating and cooling rates. This method is independent of loss coefficients, achieving high precision for solar energy applications.

Area of Science:

Instrumentation
Radiometry
Solar Energy

Background:

Accurate measurement of solar radiation is crucial for various scientific and industrial applications.
Existing pyrheliometers may have limitations in accuracy or dependency on environmental factors.
Development of a reliable and precise solar radiation measurement instrument is needed.

Purpose of the Study:

To design and construct a new copper disk pyrheliometer.
To develop and validate a novel methodology for measuring solar radiation.
To assess the instrument's accuracy and suitability as a bench standard.

Main Methods:

Utilizing a copper disk sensor with a novel methodology for solar radiation measurement.
Measuring sensor heating and cooling rates at a constant temperature to determine solar irradiance.

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Last Updated: Jul 8, 2026

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Conducting laboratory tests with a standard irradiance lamp and field tests against a calibrated pyrheliometer.

Main Results:

The new methodology for solar radiation measurement is independent of the loss coefficient.
Laboratory testing indicated an instrument uncertainty of +/-0.61%.
Field testing demonstrated good agreement with a calibrated Normal Incidence Pyrheliometer.

Conclusions:

The designed copper disk pyrheliometer offers a highly accurate method for solar radiation measurement.
The instrument's independence from loss coefficients enhances its reliability.
The pyrheliometer is well-suited as a bench standard for solar radiation measurements due to its high accuracy.