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A one-solar-constant irradiance standard.

|January 16, 2010

Summary

A new high-intensity standard for total and spectral irradiance was developed using a tungsten-halogen lamp. This standard offers precise measurements for scientific applications, improving accuracy in light intensity research.

Area of Science:

Metrology
Radiometry
Optical Engineering

Background:

Accurate irradiance standards are crucial for scientific research and technological applications.
Existing standards may have limitations in intensity or spectral range.
The National Bureau of Standards (NBS) has historically contributed to metrology advancements.

Purpose of the Study:

To develop and characterize a new high-intensity standard for both total and spectral irradiance.
To provide a reliable and accurate source for calibrating optical instruments.
To enhance the precision of measurements in radiometry.

Main Methods:

A 1000-W tungsten-halogen lamp was integrated into a ceramic reflector coated with flame-sprayed aluminum oxide (Al2O3).
Total irradiance was calibrated using the radiance of a 1400-K blackbody.

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Spectral irradiance measurements were performed across the 0.3 micrometer to 2.5 micrometer wavelength range.

Main Results:

The developed standard provides a total irradiance of approximately 136 mW cm(-2) at 40 cm from a small radiating area (3 cm x 5 cm).
Total irradiance calibrations exhibit a maximum systematic error of 0.9% and a maximum estimated standard error of 0.19%.
Spectral measurements show uncertainties ranging from 4% in the visible and near-infrared to 8% in the ultraviolet spectrum.

Conclusions:

The new high-intensity irradiance standard offers improved accuracy and reliability for scientific measurements.
This development advances the field of radiometry by providing a robust calibration source.
The standard is suitable for applications requiring precise total and spectral irradiance characterization.