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The Optical Components Should Pay Attention To The Cleaning Steps

- Nov 02, 2017 -

Under normal circumstances, the use of optical components before the inspection, cleaning before and after the inspection. Because most of the contaminants and surface defects are relatively small, we often need to use the magnifying device when inspecting the optical components. In addition to the amplification equipment, sometimes we also need to use light to illuminate the optical surface, thereby enhancing the surface contaminants and defects of the reflection intensity.

When checking the surface of the reflective film, Optical Components make the optical element close to the line of sight parallel. Approximate parallel observation of the optical surface, do not look at it, so you can see the pollutants, rather than the reflected light. The polished surface of the lens should be perpendicular to the line of sight, so that the transparency of the entire optical element can be checked.

If the clean optical surface is defective, the level of the defect can be determined by comparing the calibrated scratches - pitting control panel. If the surface defect size exceeds the manufacturer's scratches - pits specifications, Optical Components then the optical components need to be replaced to meet the performance requirements.

Cleaning procedures

If possible, be sure to read the manufacturer's recommended cleaning and operating procedures. Since the cleaning optics always require the operation of the optical element, always follow the correct operating procedure when using the following cleaning instructions. If the cleaning or improper operation, Owill permanently damage the optical components.

Prior to cleaning, first check the optical components to determine the type and extent of contamination. The inspection procedure can not be ignored because it is often necessary to use a solution to clean the optical element and to contact the optical element directly, Optical Components and if the number of operations is too frequent, it may damage the optical surface.

If there are multiple contaminants on the optics, it is necessary to pay attention to the cleaning step because another impurity may damage the optical surface when cleaning an impurity. For example, Optical Components if an optical element is contaminated with both oil and dust, wiping the oil surface will scratch the optical surface because the dust will rub the surface when wiping it.

Blow the surface of the optical element

Before making any other cleaning technology, it is usually necessary to blow away dust and other loose contaminants. This method requires the use of an inert dust tank or a blast ball. Do not blow the surface directly against the surface of the optical element because it is likely to deposit saliva on the optical surface.

If an inert dust is used, place the tank in the entire process before and during use. Do not shake the tank before use or when using it. And align the nozzle with the optical element far before blowing. These steps help to prevent the inert gas propellant from depositing on the optical surface. If you use a filling gas, Optical Components keep the tank away from the optical element by about 6 inches and use the short blow mode. The nozzle of the inert gas tank is rotated so that its nozzle forms a grazing angle with the surface of the optical element. For large-sized optical element surfaces, the optical surface is blown along the pattern of Fig.

This cleaning method is suitable for almost all types of optical components. However, for certain optical elements such as holographic gratings, scribe gratings, unprotected metal mirrors, calcite polarizers, and thin film splitters, they may be damaged under physical contact, and the wiping is the only cleaning method available. Optical Components Since this cleaning method has the characteristics of no contact and no solvent, it should be the first step of cleaning as almost all of the optical elements.

Other cleaning methods

If the surface of the optical element is not enough, the following describes the other possible cleaning methods and materials. When cleaning an optical element, clean wipes and optical grade solvents are often used to prevent damage to other contaminants. Wipe the paper must be wet with a suitable solvent, do not dry use. Available wipes (for softness considerations) are cotton (such as Webril wipes or cotton balls), lens paper, and cotton swabs.

Typical solvents used in the cleaning process are acetone, methanol, and isopropylacetone. Carefully use all of these solvents, since most solvents are toxic, flammable, or both. Optical Components Before using any solvent, please read the product data sheet MSDS table carefully

Clean the optical components

If approved by the manufacturer, fingerprints and large dust particles can be removed by soaking in distilled water and optical soap. The immersion time of the optical element should not be longer than the time required to remove the contaminants. Afterwards, clean the optical element with clean distilled water. Depending on the type of optical element, a spin-on paper (applicator) method can be selected to apply acetone, methanol, or another rapidly drying solvent, such as TravelSAFE's precision optical cleaner, to the optical element to accelerate drying. Avoid cleaning the solvent during the drying process to form small water droplets, as this often leaves water stains on the optical surface.

Optical element operation and cleaning tools

Gloves: Gloves are very important when dealing with most of the unmounted optical components. Often, the gloves that operate the optical components are not lint-free cotton or powder-free latex gloves.

Tweezers: Optical tweezers and vacuum tweezers are often used to handle smaller optical elements. Optical tweezers are designed to clip small and hard objects that do not slip and increase touch. In addition, the tip of the optical tweezers has been specifically designed to be made of a material that reduces the risk of optical elements (such as carbon resin). The vacuum tweezers use a suction cup to hold the optical element. Optical Components Usually with a wide range of cutting ends, designed to hold different shapes and sizes of optical parts. In addition, after using the vacuum tweezers to clamp the optical components, many users find it easier to use it to clamp optical components. Since it is not necessary to consider the appropriate pressure applied to the optical element as compared with the conventional optical tweezers.

Fiber wipes: Made with cotton, these wipes can be used to clean the surface of an optical element or any other element. Although the edges may be velveted, it can be avoided if it is folded and the optical element is cleaned with folded edges. This paper can also be used as a soft surface, you can place optical components.

Lens Paper: Lens paper is used to handle and clean the optical element because it provides a soft, non-corrosive surface that can safely access many types of optical surfaces. Optical Components Before placing the optical element in the storage box, the optical parts are often wrapped with lens paper.

Optical storage box: Optical storage box is usually foam or molded plastic filler. These fillers ensure that the optical element does not move inside the box and that the optical surface does not touch the hard surface. Before storing in the optical storage box, most optical components should be wrapped in lens paper. For smaller optical elements, folding the lens paper to wrap the optical element is easier than wrapping it.

Amplifiers: Amplifiers and small magnifiers allow users to double-check smaller optics. They are important to determine the cleanliness and integrity of the optical surface and help to select the appropriate cleaning procedure. In addition, if damage is found under a magnifying glass, Optical Components the optical element should be replaced.

Scratch Standard: Most optics have the manufacturer's specific scratches tolerance to classify the optical quality of the surface. Scratch The standard disc has a series of calibrated optical defects that help to determine the thickness and depth of the scratches. By comparing the defects on the optical element and the scratch standard plate, it is possible to determine whether the optical element conforms to the manufacturer & apos; s specifications. If the specifications do not meet the requirements, they need to be returned or replaced.

Inert Dust Gas: Compressed inert dust is well suited for cleaning dust and other contaminants that are not adhering to the optical surface. Other alternative sources of gas and drums. The compressed inert dust removal gas can provide a continuous high pressure gas stream that can blow off contaminants from the optical surface. However, since the gas is released from the pressurized tank, it is usually lower than the ambient temperature, causing the surface temperature of the optical element to decrease. In addition, Optical Components the compressed gas stream may contain a gas tank propellant that will be deposited on the surface of the optical element. The blast ball avoids the temperature and propellant problems, but the air blowing to the optical surface may contain contaminants that may or may not be attached to the optical surface. For those optics that are not accessible to the surface, the wiping is the only cleaning method available.

Pliers: Pliers are a small, lockable fixture that is usually used in some cleaning procedures to clip lens paper. Because pliers are easy to scratch the optical surface, Optical Components it is particularly important to ensure that the pliers do not touch the optical element.

Cotton swab applicators (some users will decide to avoid the use of pliers, while the use of cotton swabs as a substitute. They are usually 6 inches (15 cm) wooden sticks, in which one end with absorbent cotton, in a variety of cleaning process These applicators are ideal for cleaning smaller optical surfaces, Optical Components such as connecting fiber heads, and for larger surfaces it may be difficult to leave streaks after cleaning. Note: The cotton applicator Not a Q-tip or other pharmacy application. It is an optical grade product that does not leave contaminants on optical components, and its material (usually cotton) does not contain abrasive fibers contained in pharmacy products.

Optical cleaning agents: We have a wide variety of optical cleaning agents, including distilled water, acetone, methanol and isopropyl acetone. Sometimes add some mild soap to the distilled water. The new cleaning agents include precision optical cleaners, fiber preparation fluids, and fiber cleaners. It is very important to use only optical grade solvents. If the solvent contains contaminants, the contaminants will be deposited on the optical surface during the cleaning process. Due to the potential damage of the solvent, it is essential to use only the solvent approved by the manufacturer on the optical element. For example, many optical adhesives will dissolve in acetone, so using acetone to clean these optical elements may cause permanent damage.

Use the correct operating skills to reduce the number of cleaning of the optical components, thereby increasing their service life. Please open the optical components in a clean and temperature controlled environment. Never operate the optical element directly because the skin grease may permanently damage the optical surface. The correct way is to wear gloves. For smaller optical elements, it is easier to use optical tweezers or vacuum tweezers. Regardless of the method used to hold the optical components, if possible, can only hold non-optical surfaces, such as frosted edges.

IMPORTANT: The optical surfaces of the following optical elements can not be touched by hand or instrument: holographic gratings, scribe gratings, unprotected metal mirrors and thin film spectroscopes (this is not an exhaustive list). These optical components are particularly sensitive and any direct contact can cause damage.

WARNING: Most crystals (such as calcite, beam shifters, lithium niobate wafers and electro-optical modulators) are susceptible to temperature and may crack when subjected to thermal shock. Therefore, before opening to ensure that the packaging and internal items to achieve temperature balance. These crystals are much lighter than ordinary optical elements, so they need to be handled more carefully when cleaning.

Do not place the optical element on a hard surface because the impurities on both surfaces wear the optical element. Most optical elements should be wrapped with lens paper and then placed in a particular optical element storage box. Generally store the storage box in low humidity, high cleanliness and temperature control environment. Optical Components The optical elements are easily scratched or contaminated, and some of the optical coatings are hygroscopic, so that it is important to store the optical elements reasonably for protecting the optical elements.

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