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An automatic photoelectric instrument and method for the continuous measurement of the ozone in the earth's atmosphere at low altitudes are described. The method is physical rather than chemical in character and is based upon the optical absorption characteristics of ozone in the Hartley and Huggins ultraviolet bands. The instrument makes use of a low-pressure mercury arc, which is situated at a distance of 1,450 feet from the recording station that employs a 1P28 photomultiplier as a detector. The light beam is modulated, at 510 cycles per second, so that the output of the photomultiplier is fed into a tuned alternating-current amplifier and amplified to the recorder level. By means of a Geneva mechanism, which changes the glass filters, the radiant energy from the lamp is separated into bands primarily at wavelengths 253.7, 365.5, and 405.0 millimicrons. From the ratios of the deflections for the different spectral regions it is possible to determine ozone concentration in the range from a few tenths of 1 part to many parts per 100 million.

Continuous measurement of atmospheric ozone by an automatic photoelectric method