Optical Inspection Device.
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A telescopic device is disclosed for conducting inspections of the interior of a boiler furnace for the presence of fuel oil prior to ignition of the furnace. The device includes an elongated furnace tube having a pair of opposed light sources for illuminating areas of the furnace interior and a 90 deg reflecting prism mounted in radial alignment with the light sources at the outer end of the tube for collecting reflected light from the illuminated areas. An optical tube coaxially coupled to the inner end of the furnace tube is provided with an arrangement of achromatic lenses for focusing the collected light with maximum color differentiation so that the true color of the illuminated furnace interior may be viewed. Both tubes together are rotatably coupled to an eye piece assembly including an achromatic ocular lens so that a field of view is provided through 360 deg of rotation.
- Air Conditioning, Heating, Lighting and Ventilating
- Safety Engineering
- Optical Detection and Detectors