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Area of Science:

Photometry
Spectrophotometry
Optical Measurement

Background:

Accurate photometric measurements are crucial for scientific research and instrument calibration.
Existing calibration methods may have limitations in precision and scope.
The need for precise verification of spectrophotometer performance is essential.

Purpose of the Study:

To calibrate a simple phototube photometer using Reule's supplementary light method.
To determine the absolute photometric accuracy of the calibrated photometer.
To assess the photometric accuracy of a General Electric recording spectrophotometer.

Main Methods:

Application of Reule's supplementary light method for photometer calibration.
Utilizing a calibrated phototube photometer for photometric measurements.
Testing the photometric scale of a General Electric recording spectrophotometer.

Main Results:

The phototube photometer was calibrated to an absolute accuracy of +/-0.006% (95% confidence limits).
The General Electric recording spectrophotometer demonstrated photometric accuracy within 0.1% over its entire range.
The calibrated photometer provided a reliable standard for spectrophotometer verification.

Conclusions:

Reule's supplementary light method enables high-accuracy photometer calibration.
The calibrated photometer successfully validated the accuracy of the spectrophotometer.
Precise photometric calibration is achievable and vital for instrument validation.