Method and apparatus for combustion control and improved optical

Optics: measuring and testing – Optical pyrometers – Plural color responsive

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356418, G01J 560, G01J 350

Patent

active

044102666

ABSTRACT:
A combustion technique and control is provided by the use of an optical pyrometer by means of which combustion control is afforded in accordance with the inspection of the combustion flame. The preferred optical pyrometer takes the form of an optical pyrometer having a single measurement cell which is alternately exposed to the flame through different filters arranged on a rotating disc driven by a motor. The circuit associated with the optical pyrometer, for purposes of generating control signals, features the use of a synchronous D. C. restorer which establishes a reference level for minimum signal distortion. Also employed is an AGC circuit by means of which one of the signals derived from one of the aforementioned filters is utilized to minimize undesired variations in the results. Gating logic is used to separate the two channels derived from the different filters and actually demultiplexes the two separate channels. It also recognizes a small, synchronous pulse derived from a sync opening on a disc on which the filters are mounted. Low pass filtering and D. C. amplification is employed to provide for filtering of noise and spurious signals and to compensate for duty cycle loss.

REFERENCES:
patent: 2648253 (1953-08-01), Sweet
patent: 3273448 (1966-09-01), Kelly
patent: 3368753 (1968-02-01), Baumgartel et al.
patent: 3795918 (1974-03-01), Sunderland
patent: 3833304 (1974-09-01), Liston
patent: 4083367 (1978-04-01), Portner et al.

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