CCTV(Closed Circuit Television) lens, that is, closed-circuit television lens, which is designed for the application of video surveillance, this kind of lens is suitable for long-distance imaging, also known as infinite conjugate lens. In general, this type of lens will have a shortest working distance, less than the distance can not be clearly focused.
Closed-circuit television monitoring system (example) is an important part of the security technology prevention system. It is an advanced and comprehensive system with strong prevention ability. It can directly watch all the conditions of the monitored place through remote control cameras and their auxiliary equipment (lens, PTZ, etc.). At the same time, it can also operate in conjunction with other security technology prevention systems such as anti-theft alarm system to make its prevention ability more powerful. The technical requirements of the closed-circuit television monitoring system are mainly: the definition of the camera, the transmission bandwidth of the system, the signal-to-noise ratio of the video signal, the standard of the television signal, the camera, etc.
telecentric lens
Telecentric lens is a lens specially designed to correct the parallax of traditional industrial lens. Its purpose is to eliminate the problem of different magnification due to the inconsistent distance between the measured object (or CCD chip) and the lens. At present, telecentric lenses are mainly divided into three categories: object telecentric lens, image telecentric lens and bilateral telecentric lens, which are widely used in machine vision applications.
Advantages of telecentric lens technology
1, high resolution
The image resolution is generally measured by the CTF (contrast transfer function) that quantifies the existing spatial frequency contrast of the image sensor, and the unit is lp/mm. Most machine vision integrators often just collect a large number of cheap low-pixel, low-resolution lenses, and finally only generate blurred images. With a telecentric lens, high-resolution images can be generated even with small pixel image sensors.
2. True telecentric design, ultra wide depth of field and low distortion
There was once a view that the telecentric lens mainly solve the problem of distortion, in fact, the telecentric lens to solve not only the problem of distortion, low distortion is only the additional properties of telecentric lens. The unique optical characteristics of the telecentric lens: when the object moves in the field of view, its magnification in different positions will not change, which determines that it can not be replaced by ordinary industrial lenses in some fields. For example, its larger depth of field range can be well adapted to the working environment on site, which is not a problem that can be solved only by algorithms.
3. Unique parallel optical path design
The design of a telecentric lens for parallel light imaging is not complicated in theory, but it is another matter to achieve a certain analytical ability and image quality. The design and manufacture of telecentric lens is indeed more difficult than the general sense of the lens, the reason is due to the telecentric lens optical lens size is relatively large, making the edge of the light of all kinds of phase difference correction difficulty increases.
Collimation beam expander lens
The collimating beam expander head is capable of changing the laser beam diameter and divergence angle of the lens assembly. The laser beam emitted from the laser has a certain divergence angle. For laser processing, only by adjusting the beam expander to make the laser beam become a collimated (parallel) beam, can the focusing lens be used to obtain a small high-resolution density spot. Used in laser ranging, etc.
gun aim lens
The gun aiming lens, also known as the optical sight, is a aiming device made of optical principles, which is composed of a lens, a lens body and a lighting device. Generally speaking, the light transmittance of the multi-layer coating sight is better than that of the single-layer or no coating sight. The high-quality sight usually has 3 to 7 layers of coating, and the processing process of each layer is very complicated. The more coating layers, the higher the price. The image observed by a high-quality scope does not produce any distortion, and there is no difference in brightness between the edge and the center of the image.
infrared lens
Professional custom infrared optical imaging lens 800nm-8000nm optional band. Working principle: the far infrared light (8~12 micron wavelength) emitted by 0~100 degree objects is focused by the infrared optical lens, and then imaged into the surface array detector made of vanadium oxide material. The characteristic of the optical system is that the higher the surface temperature of the object, the higher the gray value after imaging, that is, the higher the brightness. This type of camera is mainly used for night vision technology, military missile or aircraft tracking.
endoscopy lens
Endoscopy, also called endoscope is a kind of commonly used medical equipment. It consists of a bendable part, a light source and a set of lenses. Through the body's natural orifice, or through a small surgical incision into the body. When in use, the endoscope is introduced into the pre-examined organ to directly see the changes in the relevant parts.
Pieter Optoelectronics can be customized according to the products applied by customers, focal length/angle/volume and other specific index parameters: medical endoscope, capsule mirror, endoscope and other medical instrument lenses.