Abstract: An optical video signal processor which produces a two-dimensional cross-correlation in real time of images received by a stereo camera system. The optical image of each camera (12, 14) is projected on respective liquid crystal light valves (28, 48). The images on the liquid crystal valves (28, 48) modulate light produced by an extended light source (32). This modulated light output becomes the two-dimensional cross-correlation when focused onto a video detector (42) and is a function of the range of a target (1) with respect to the stereo camera (10). Alternate embodiments utilize the two-dimensional cross-correlation to determine target movement and target identification.

Abstract: The invention is a television camera apparatus (10) wherein bright objects are attenuated to fit within the dynamic range of the system, while dim objects are not. The apparatus receives linearly polarized light from an object scene (12), the light being passed by a beam splitter (20) and focused on the output plane of a liquid crystal light valve (16). Light valve (16) is oriented such that, with no excitation from cathode ray tube (22), all light is rotated 90.degree. and focused on the input plane of video sensor (28). The light is then converted to an electrical signal, which is amplified by amplifier (30) and used to excite CRT (22). The resulting image is collected and focused by lens (24) onto light valve (16), which rotates the polarization vector of the light to an extent preportional to the light intensity from CRT (22). The overall effect is to selectively attenuate the image pattern focused on sensor (28).

Abstract: A combustion device includes a fuel-air ratio controller. A control is coupled to receive a first signal functionally related to the status of the fuel-air controller and a second signal from an oxygen sensor which is functionally related to the oxygen in the discharge gases from the combustion zone. The control is operative to provide an output signal to a fuel regulator for adjusting the fuel delivered to the combustion zone in relation to the oxygen in the discharge gases.

Abstract: Fuel is burned in a primary combustion chamber with less than the air required for stoichiometric combustion so that the combustion gases have a high carbon monoxide (CO) and hydrocarbon content and the temperature of the gases is held below that at which significant nitrogen oxides (NO.sub.2) would be produced. The combustion gases are then passed through a secondary combustion zone in which more air is injected into the gas stream to oxidize the CO and hydrocarbons to carbon dioxide (CO.sub.2). The secondary burner comprises a plurality of foraminous tubes through which secondary air is emitted. Combustion in the secondary zone is maintained at a temperature below that at which nitrogen oxides (NO.sub.x) will be produced in significant quantities.

Abstract: Fuel is burned in a primary combustion chamber with less than the air required for stoichiometric combustion so that the combustion gases have a high carbon monoxide (CO) and hydrocarbon content and the temperature of the gases is held below that at which significant nitrogen oxides (NO.sub.x) would be produced. The combustion gases are then passed through a secondary combustion zone in which more air is injected into the gas stream to oxidize the CO and hydrocarbons to carbon dioxide (CO.sub. 2). The secondary burner comprises a plurality of foraminous tubes through which secondary air is emitted. Combustion in the secondary zone is maintained at a temperature below that at which nitrogen oxides (NO.sub.x) will be produced in significant quantities.

Abstract: Fuel is burned in a primary combustion chamber with less than the air required for stoichiometric combustion so that the combustion gases have a high carbon monoxide (CO) and hydrocarbon content and the temperature of the gases is held below that at which significant nitrogen oxides (NO.sub.x) would be produced. The combustion gases are then passed through a secondary combustion zone in which more air is injected into the gas stream to oxidize the CO and hydrocarbons to carbon dioxide (CO.sub.2). The secondary burner comprises a plurality of foraminous tubes through which secondary air is emitted. Combustion in the secondary zone is maintained at a temperature below that at which nitorgen oxides (NO.sub.x) will be produced in significant quantities.