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CARE OF OPTICS
Operation - 14244_37

Signalman 3 & 2 - Aviation theories and other practices
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Prevent dust from getting on the lenses as much as possible. Always leave the optics in their cases, or covered, when not in use. When dust gathers on the lenses, clean them only with lens paper, and make sure that your supply of lens paper is kept clean. Don't clean a lens when it doesn't need it. Repeatedly cleaning a lens, no matter how skillfully you do it, eventually damages the lens. Strong sunlight discolors the cement, and excessive heat often softens cemented lenses and filters and may allow them to separate. Moisture in any form, whether salt spray or the perspiration from your hand, causes film and chemical deterioration of the optical glass. To have a useful piece of optical equipment when you need it, follow these few simple rules: Handle your optical equipment carefully. Don't let it bang against another object. When the optical equipment is not in use, keep it stowed in its proper place. Keep it dry and out of the weather. Keep it clean; use only appropriate material to clean it. Don't hang optical devices over the side, and when you are using binoculars, always keep them on a strap around your neck. Don't attempt to repair optical equipment. Send it to a repair ship or tender where Opticalmen have the proper equipment to make repairs. NIGHT VISION DEVICES LEARNING OBJECTIVE: Explain procedures for operating, maintaining, and cleaning night vision devices. Night vision devices belong to a family of precision instruments that use electronic optics for observation, surveillance, and navigation. Night vision sights (NVSs) can be used in conjunction with the IR equipment discussed previously in this chapter. Night vision devices are used to scan an area accurately and to detect enemy movement, to observe friendly forces, or to accomplish various other tasks associated with night devices. Normally, night vision devices will be operated on ships from the signal bridge and bridge level. As a Signalman, you will be required to maintain and operate night vision equipment. This section will acquaint you with the principles of operation, maintenance, and safety precautions for night vision devices. MK 37 NIGHT VISION SIGHT The Mk 37 Mod 1 and Mod 3 NVS (fig. 2-16) are passive sights that emit no visible or IR light. An image intensifier tube is used to amplify received light, thus enhancing or allowing vision under nighttime or similar conditions of low illumination. The primary function of the Mk 37 NVS is long-range observation, such as enemy surveillance and target detection. Figure 2-16.—Mk 37 Mod 1 and Mod 3 night vision sights. 2-14







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