= Maria E. Nadal
{c}
A researcher whose joint NIST work establishes quantitative <photometry>. A calibrated <photometer> relates its electrical output to <illuminance>, with corrections for its wavelength response and the spectrum of the source being measured. Those corrections matter because equal optical powers at different wavelengths need not appear equally bright to a human observer.<NIST Measurement Services: Photometric Calibrations by Yuqin Zong and others>[§§3.2–3.5.6: photometer apparatus, readout and spectral-response corrections]{ref}
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