Photographic film was calibrated for energy measurements of pulsed ruby lasers. The film can be used to obtain energy values accurate to about 20%. The method works under field conditions when the use of electronic instruments may be impractical.
C. G. Lehr,
J. R. Peters,
D. B. Mento,
"The Calibration of Photographic it for the Measurement of Q-Switched Ruby-Laser Energy," Optical Engineering 16(4), 164399 (1 August 1977). https://doi.org/10.1117/12.7972059