Factors to consider when selecting filters and polarizer adjustment methods

by:Crylight     2021-05-16

The types of filters and the wavelength band involved are different, you must be rigorous in the process of selecting filters, and you must consider the details of each parameter of the product. If there is one point that is not considered comprehensively, it may cause the product to be unusable. Or the effect is not ideal, the spectral characteristic is one of the most important characteristics of the optical filter. According to the spectral characteristics, it can be divided into cut-off filters, band-pass filters, anti-reflection filters, reflection filters, spectroscopic filters, attenuation filters, etc.

   In order to better meet the requirements of customers, the city technology salesperson needs to communicate with customers in detail. This is very important. The customer's requirements for the characteristics of optical interference filters are the prerequisites for guiding us in the development of the production of laser focusing lenses. Only by knowing this can we accurately manufacture products that satisfy customers. At the same time, because optical filter products involve a lot of professional knowledge, only through communication, describing the product requirements and characteristics as detailed as possible, and clarifying the acceptable tolerance range, can satisfactory products be produced. We can also obtain preliminary characteristic curves for customers' reference through computer simulation design. Of course, not all the spectral characteristics that can be designed can be produced, because subject to the constraints of the optical coating machine's own conditions, there are many factors to consider, such as the vacuum performance of the coating machine, the ability to test optical characteristics, the characteristics of the coating material, and the fixtures Whether it is equipped with a laser protective lens, the size of the uniform area of u200bu200bthe film, the surface defect, the yield, etc.

   Compared with professional optical film application designers, the spectral characteristics proposed by most customers are often a preliminary and vague concept. The information that the sales staff of City Technology needs to know may include the application scope of your product, such as whether it is used in a fluorescence detection system, a biochemical detection system, or other optical instruments or equipment;

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   prisms can be divided into:

   Deflection prism: Let the light pass through the prism and change its direction. Generally, prisms with little deflection are called wedge mirrors or thin Prism, achromatic Fresnel (Fresnel) double prism can also be used as a deflection (non-dispersion) laser collimator

   Dispersive prism: a large-angle refractive prism, mainly Used in spectroscopy instruments, dispersive prisms are mainly divided into direct-view dispersion prisms and constant-deflection dispersion prisms. Constant-deflection dispersion prisms sometimes use one of its surfaces as a reflecting surface, but the main function is in refraction. In deflection prisms and dispersion prisms , The intersection of two successively refracted surfaces (or the intersection after extension is called the refraction edge or ridge of the prism. The angle between the two surfaces is called the refraction edge. The surface opposite to the edge is called the bottom surface of the prism. The surface perpendicular to the prism is called the bottom surface of the prism. Used as a prism interface.

  Reflective prism: It plays a major role in non-dispersive prisms, and it changes the direction of light and also plays a role of turning. Usually total reflection is used to reduce light consumption. It cannot be supplemented by all-optical lens reflection with silver plating.

   Polarization prism: separates polarized light from non-polarized light, used to study some physical phenomena or control reflected by polarization Light intensity. If there is a special polarizing microscope, one of the polarizing prisms is called a bidirectional prism. In the microscope condenser system, prisms are also used to supplement the light.

  Linear polarization is an ordinary polarizer. After the light passes through, it is in a state of a single polarization direction. Circular polarization is the addition of a lens to the linear polarization to make the polarized light become circularly polarized. It can also be said that it is not. Then there is polarized light. It can be simply said: the light after linear polarization is polarized light, and the light after circular polarization is not polarized light. This is the biggest difference between optical lenses.

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  The specific adjustment method of the polarizer is as follows:

   Install the polarizer directly on the front of the camera lens, and slowly rotate the polarizer while viewing through the LCD screen or viewfinder The polarizer observes the polarized light source in the subject until it disappears or weakens to the expected effect; you can also place the polarizer directly in front of your eyes and rotate the polarizer while viewing the view until the polarized light disappears or weakens to the expected size. Then, under the premise that the orientation of the polarizer remains unchanged (that is, the direction indicated by the mark on the edge of the polarizer remains unchanged), the polarizer is translated and placed on the front end of the photographic lens. After this, the camera cannot change the shooting orientation at will, otherwise it must be re-started. Adjust the polarization direction of the polarizer.

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