G - Physics – 01 – J
Patent
G - Physics
01
J
354/30, 73/57
G01J 1/26 (2006.01) G01N 21/01 (2006.01) G01N 21/35 (2006.01)
Patent
CA 1036834
ELECTRONICALLY COMPENSATED ROTATING GAS CELL ANALYZER Abstract of the Disclosure In a gas analyzer a beam of radiant energy is passed through a rotating gas cell which alternately inserts optically transmissive chambers into the path of the beam. One chamber contains a quantity of gas of the species to be analyzed at a pressure that produces sharp absorption lines. The other chamber is provided with either a quantity of gas at a pressure that produces substantial line broadening or a neutral density attenuator. In either case the chambers are made to have substantially equal average transmissivity over the spectral band of interest. The beam is then passed through a sample region in which the gas species concentration is to be measured. The beam is then detected by a photodetector. A filter, usually associated with the photodetector, limits the radiant energy response to a spectral region where the gas species to be measured displays suitable absorption lines. An electronic system amplifies the photodetector output and demodulates that signal component which occurs at a frequency corresponding to the cell rotation rate. In the absence of the particular gas in the sample region the two cell chambers have equal average transmissivity, and there should be no such component. However, if a quantity of the gas species to be measured is present in the sample region, a rotation rate signal component will be present and will be in proportion to the total quantity of that gas species in the sample region. In practice it is difficult to precisely balance the cell transmissivity values and, even if achieved, such balance is difficult to maintain. Accordingly the electronic amplifier is gain modulated at the cell rotation rate so that residual optical unbalance is corrected electrically. -1- Since this correction is accomplished multiplicatively, it is independent of optical and electronic gain and loss values.
228303
Burch Darrell E.
Edwards Byron N.
Pembrook John D.
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