Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-09-05
1984-01-17
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
250339, 356323, 356437, G08B 1710
Patent
active
044266405
ABSTRACT:
Apparatus for monitoring gaseous pollutants (e.g. on a chemical plant) produces two infra-red laser beams having different wavelengths (one corresponding to an absorption line of the gas to be monitored, the other being a reference) which are modulated with different frequencies or phases, and then combined into a single scanning beam. The scanning beam is continuously displaced angularly so as to scan the area to be monitored. A portion of the beam is returned to the apparatus by scattering or reflection, and is measured. By correlating this with the direction of the beam, a plan of the monitored area superimposed with a continuously updated indication of the amount of gas can be displayed e.g. on a VDU.
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patent: 3619057 (1971-11-01), Castellano et al.
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Journal of Applied Physics, vol. 46, No. 7, Jul. 1975, W. B. Grant and R. D. Hake, Jr., pp. 3019-3023, GP Elliott Brochure.
Becconsall Jack K.
Cramp John H. W.
Moore Reginald C.
Reid Robert F.
Rye Barry J.
Caldwell Sr. John W.
Imperial Chemical Industries Limited
Myer Daniel
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