cralx2000
Established
GENERAL INSTRUCTIONS: OPTICS LABORATORY
THOROUGHLY WASH, RINSE, AND DRY HANDS BEFORE COMING TO LAB.
CARE OF OPTICAL COMPONENTS:
1. NEVER TOUCH OPTICAL SURFACES. Perspiration may be sufficiently acidic that the pattern of a fingerprint can become etched into a glass surface and be impossible to remove. Handle lenses by their edges only. Optical workers wear soft cotton gloves when handling lenses.
2. NEVER TOUCH GLASS SURFACES. The glass surfaces of projection lamps, concentrated arc lamps, photocells, etc. must not be touched. Fingerprints on the glass surfaces of lamps can cause fracture of the glass when it becomes hot. Foreign substances on the surfaces of photocells can cause electrical leakage which degrade its performance.
3. AVOID SURFACE ABRASION. Never lay a lens on a table, for this can scratch the lens surface. A convex surface is especially vulnerable to such damage, for it will be abraded at its center, its most useful part. When lenses must be set aside, lay them on soft cloth of foam plastic pads provided at each lab station.
4. LENS CLEANING. High quality lenses, like camera lenses, generally consist of a number of elements, some of which may be cemented together. Cleaning with solvents is to be avoided, for some solvents can penetrate the cemented surfaces, dissolving the cement. Even the most careful cleaning methods, if too frequently used, degrade the lens surface, especially if the lens is anti-reflection coated. Protect optical surfaces to avoid the necessity of cleaning. Do not expose them to air pollution -- keep lenses capped or in a case. For example, cooking grease in the air of a home can deposit a foul film on the exposed surface of a lens. Do not use solvents or lens tissue if the only problem is dust particles. Particles may be blown off with an air blast from a small ear-syringe. Do not use air from a compressed-air pump, for it can contain water, oil, and grit.
THOROUGHLY WASH, RINSE, AND DRY HANDS BEFORE COMING TO LAB.
CARE OF OPTICAL COMPONENTS:
1. NEVER TOUCH OPTICAL SURFACES. Perspiration may be sufficiently acidic that the pattern of a fingerprint can become etched into a glass surface and be impossible to remove. Handle lenses by their edges only. Optical workers wear soft cotton gloves when handling lenses.
2. NEVER TOUCH GLASS SURFACES. The glass surfaces of projection lamps, concentrated arc lamps, photocells, etc. must not be touched. Fingerprints on the glass surfaces of lamps can cause fracture of the glass when it becomes hot. Foreign substances on the surfaces of photocells can cause electrical leakage which degrade its performance.
3. AVOID SURFACE ABRASION. Never lay a lens on a table, for this can scratch the lens surface. A convex surface is especially vulnerable to such damage, for it will be abraded at its center, its most useful part. When lenses must be set aside, lay them on soft cloth of foam plastic pads provided at each lab station.
4. LENS CLEANING. High quality lenses, like camera lenses, generally consist of a number of elements, some of which may be cemented together. Cleaning with solvents is to be avoided, for some solvents can penetrate the cemented surfaces, dissolving the cement. Even the most careful cleaning methods, if too frequently used, degrade the lens surface, especially if the lens is anti-reflection coated. Protect optical surfaces to avoid the necessity of cleaning. Do not expose them to air pollution -- keep lenses capped or in a case. For example, cooking grease in the air of a home can deposit a foul film on the exposed surface of a lens. Do not use solvents or lens tissue if the only problem is dust particles. Particles may be blown off with an air blast from a small ear-syringe. Do not use air from a compressed-air pump, for it can contain water, oil, and grit.
