Optical glass differs from other glass in that it is an integral part of the optical system and must meet the requirements of optical imaging. Therefore, the determination of the quality of optical glass also includes some special and more stringent indicators. The following requirements for optical glass:
First, the specific optical constant and the consistency of the optical constants of the same batch of glass
Each type of optical glass has a specified standard refractive index value for different wavelengths of light, which serves as the basis for the optical designer to design the optical system. Therefore, the optical constant of the optical glass produced by the factory must be within a certain tolerance range of these values. Otherwise, the actual image quality will be inconsistent with the expected result at the design and affect the quality of the optical instrument. At the same time, because the same batch of instruments are often made of the same batch of optical glass, in order to facilitate the uniform calibration of the instrument, the refractive index tolerances of the same batch of glass are more strict than their deviation from the standard value.
Second, a high degree of transparency
The brightness of the optical system imaging is proportional to the transparency of the glass. The transparency of the optical glass to a certain wavelength of light is expressed by the light absorption coefficient KÎ». After passing through a series of prisms and lenses, the energy is partially lost to the interface reflection of the optical part and the other part is absorbed by the medium (glass) itself. The former increases with the increase of the refractive index of the glass, and the value of the high refractive index glass is very large, for example, the surface light reflection loss of the heavy glass is about 6%. Therefore, for an optical system including a plurality of thin lenses, the main way to increase the transmittance is to reduce the reflection loss of the lens surface, such as coating the surface antireflection film layer.
For large-sized optical parts such as the objective lens of an astronomical telescope, the transmittance of the optical system is mainly determined by the light absorption coefficient of the glass itself due to its large thickness. By increasing the purity of the glass raw material and preventing any incorporation of any coloring impurities during the entire process from batching to smelting, it is generally possible to make the glass have a light absorption coefficient of less than 0.01 (i.e., a glass having a thickness of 1 cm has a light transmittance of more than 99%). .
Our Seaweed Extract Fertilizer is made from one new technology, it is the world's leading low-temperature extraction of alginic acid core technology, solid-state fermentation cell wall autolysis technology. The technology is the world's first and has won the national invention patents.
Brief introduction of Alginate solid state fermentation and synergistic extraction technology as following:With high quality brown algae (wild kelp) as raw material, based on the characteristics of different fertilizer and the rules of crop fertilizer requirements, targeted inoculate of specific functional compound bacteria, ferment the organic polymers such as Macromolecule brown alga, seaweed protein, seaweed polysaccharide in kelp into active ingredients such as small molecule alginate, active oligosaccharide and alkaloid which are more easily absorbed by the crops. Mild extraction can avoid the destruction of seaweed active substances by strong acid and alkali, and ensure the natural composition and biological activity of alginate synergist. The product is rich in extraction with high concentration and activity synergistic composition. While preserving the active constituents of the seaweed, the macromolecules are converted into small molecules that can be absorbed directly by the crops. It can also metabolize other active ingredients, which are not contained in the raw material of seaweed and are beneficial to the crops, and maintain and improve the biological activity of seaweed. Alginate fertilizer produced by this technique has the function of micro-efficiency, two-way control, promoting root resistance, increasing production and improving quality.
We use pure natural algae solid state fermentation cell wall autolysis extraction of seaweed extract, distinguished from chemical hydrolysis. Because there is no strong alkali, strong acid and high temperature in biological fermentation process, it can ensure that the active ingredients in seaweed are well preserved, while chemical hydrolysis is easy to destroy the activity of the internal source of seaweed. Biological fermented seaweed fertilizer is a new type of fertilizer with high scientific and technological content, ecological environmental protection, high efficiency and value-added.
Seaweed Extract Fertilizer
Seaweed Extract Fertilizer,Seaweed Extract Foliar Fertilizer,Compound Seaweed Extraction Fertilizer,Water Soluble Organic Seaweed Extract Fertilizer
China National Huachen Energy Group Co., Ltd. , http://www.chc-chem.com