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  • What is the difference between infrared light and visible light?

    In the realm of electromagnetic radiation, there exist two distinct types: infrared light and visible light. These two types differ in several key aspects:
     
    1. Wavelength Range: Infrared light typically spans a range of 0.75 to 1000 microns, whereas visible light covers a narrower range of 0.4 to 0.75 microns.
     
    2. Perception: Visible light can be directly perceived by our eyes, forming visual images. On the other hand, our eyes cannot directly detect infrared light, necessitating specialized equipment like infrared cameras for its observation.
     
    3. Propagation: Due to its longer wavelength, infrared light encounters less resistance as it propagates through the natural environment. It can penetrate various pollutants in the atmosphere, such as smoke and haze. In contrast, visible light faces greater resistance and is more prone to scattering and reflection when passing through thicker haze conditions.
     
    4. Applications: The unique properties of infrared light, including its permeability, thermal imaging capabilities, and ability to remain concealed, make it highly valuable in fields like night vision, medical diagnosis, and security inspection. Visible light, on the other hand, is better suited for tasks such as lighting, photography, and display purposes.

  • What is the difference between infrared and thermal imaging?

    Thermal imaging cameras convert invisible infrared energy emitted by objects into visible thermal images. The different colors on the thermal image represent different temperatures of the object being measured. By viewing thermal images, you can observe the overall temperature distribution of the target being measured, study the heating status of the target, and provide a basis for judgment for work and research.
     
    Infrared rays are divided into near-infrared, short-wave infrared, medium-wave infrared, and long-wave infrared according to the atmospheric window. Long-wave infrared can be observed through the air, but cannot be observed through walls and glass, and has the advantages of all-weather imaging, non-contact temperature measurement, and smoke-penetrating observation.

  • How to produce infrared lenses?

    Infrared lens is an optical lens based on the infrared spectrum band. Its main feature is that it can be used to detect the thermal radiation of objects. It has wide applications in modern, security, medical and other fields. Below we take an infrared lens as an example to introduce its manufacturing process in detail.
    Process flow:
    1. Select materials: The selection of infrared optical materials is a key link in the design of infrared optical systems. Generally used materials include zinc sulfide (ZnS), zinc selenide (ZnSe), sulfide (CdS) selenide steel (InSe), etc. In this case, we chose zinc sulfide (ZnS) material.
     
    2. Material processing: The selected infrared optical materials are processed, usually by cutting, grinding, polishing, etc., to make lenses with the required geometric shape and surface quality.
     
    3. Coating: In order to improve the transmittance of the lens for specific wavelengths, a reflective film is generally coated on the surface of the infrared lens. The coating process is relatively demanding and requires sophisticated equipment and technical support.
     
    4. Assembly: Combine the processed lenses and reflectors to form a complete infrared optical system. 

  • What materials are suitable for making infrared lenses?

    1. ZnSe (Zinc Selenide)
    2.ZnS (Zinc Sulfide)
    3.CaF2 (Calcium Fluoride)
    4.MaF2 (Magnesium Fluoride)
    5.BaF2 (Barium Fluoride)
    6.LiF (Lithium fluoride)
    7.GaAs (Gallium Arseide)
    8. Ge (Germanium)
    9.Si (Silicon)

  • What is AR coating？

    AR coated glass, also known as anti-reflection glass, is a type of glass that undergoes special treatment on its surface.
    This treatment reduces its reflectance, making it have a lower light reflectivity of less than 1% compared to ordinary glass. Ordinary glass has a one-sided reflectivity of about 4% in the visible light range, with a total spectral reflectance of approximately 8%.
    The anti-reflection effect of the glass surface in the visible light range can be achieved through two methods.
    The first method utilizes the interference effect created by different optical material layers to eliminate both incident and reflected light, thus improving the transmittance. This type of glass, produced through the destructive interference of light, is called AR glass.
    The second method involves using the scattering effect of a finely roughened surface to convert a significant amount of incident light into diffuse reflected light, without causing noticeable changes to the transmittance. This type of glass, created through fine roughening, is known as AG glass.

  • What is DLC coating？

    "DLC" is the abbreviation of "DIAMOND-LIKE CARBON" in English. DLC is a substance composed of carbon elements, similar in nature to diamond, but also has a structure composed of graphite atoms. Diamond-like carbon film (DLC) is an amorphous film.
    Due to its high hardness and elastic modulus, low friction coefficient, wear resistance and good vacuum tribological properties, it is very suitable as a wear-resistant coating, causing attracted the attention of the tribology community.
    There are many methods for preparing DLC films. The carbon sources used in different preparation methods and the ion energy reaching the substrate surface are different. The structures and properties of the deposited DLC films are very different, and the tribological properties are also different.
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