Status and development of industrial infrared detector! Thai shortwave infrared thermography are industrial thermometer

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Infrared technology status and role of
infrared technology has four major advantages: good environmental adaptability, ability to work at night and in bad weather is better than visible light; concealment, and not be disturbed; because it is by between target and background, each target and the ability of infrared radiation emissivity difference between the temperature difference between the portion of the probe is formed, and thus superior recognition disguise visible; small infrared system, light weight, low power consumption. But there are three major factors restricting its effect: the spectral characteristics of the target; performance detection system; environment and distance between the target and detection ports. Infrared detection technology is developed around solving the above problems, such as: a. To take advantage of the atmospheric window, the detector extends the spectral response from the long-wave infrared SWIR to achieve detection of the target temperature; b. Polyols from the detector to the development unit, from the focal plane to diversified development, the two major steps, a probe corresponding system from the point source to achieve the target thermal imaging leap; c. The system developed from the single-band multiband; d. The development of a wide variety of probes, provide ample choice for the system application.
After the Cold War, the US global strategic adjustment, which is the US military's Future Combat proposed that can synthesize and process monitoring systems and global communication systems and related data for a centralized theater, the formation of information advantage; in all weather, day and night conditions defense, to identify and combat important target two kinds of fixed and mobile combat capability with infrared technology is closely related to under camouflage and can break. Driven by technological development related to traction and military needs, infrared technology from the past to today's tactical position strategic position, in particular in: a. Infrared technology is the main means of national security detection technology dependent. Early warning of ballistic missiles and long-range cruise, track, identify and block vital to national security strategic objectives; b. Strategic position of infrared technology in the future of military technology is used by the breadth and importance of the decision. In the future, technology will be used in terms of infrared photoelectric confrontation, optical communications, directed energy weapons such as fast-growing; c. Infrared technology is one of the main technology used in future high-tech local wars. It is now clear, transparency is one way to get on the battlefield, that battle to obtain information superiority is a key factor for the initiative in the war, in order to achieve this, the infrared system is now land, sea and air in developed countries, days all kinds of weapons systems indispensable, even the main sensor.
Situation 2-color infrared detector
All are probing technology to get more information on the target direction, infrared technology is no exception. In the atmosphere, the infrared radiation is only 1 to 2.5 m, the effective transmission 3 to 5 micrometers and 8 to 14 micrometers three windows. If a thermal imaging system in which two bands simultaneously obtaining the target information, it is possible to suppress complex background, the effect of improving the detection targets, in the warning, the search and tracking system can significantly reduce the false alarm rate, significant improve system performance and versatility in a variety of weapon platforms to meet the military, arms, especially the Air Force, Navy demand for thermal imaging systems. Because most of the military thermal imaging systems are working in medium wave, long wave, so the majority of domestic and foreign research and color detectors are in long-wave detectors.
Two-color detector can be used: missile warning, meteorological, resource remote sensing satellite, airborne before looking infrared and reconnaissance systems, helicopter gunships and carrier-based aircraft target designation system, a low-altitude air defense missile optical fire control system, precision-guided IR imaging guided weapons seeker, warning, and short-range missile fire control systems of the surface vessel, a dual band thermal imaging device and the like. Usually dual-band thermal imaging system configured in three main ways: a. Two sets of combination of direct thermal imaging system, a single band is made; b. Two different wavelength bands, respectively, in response to a common probe assembly of the optical system; c. Can respond with a two-color infrared detector wavelength band (hereinafter referred to as color sensor) a common optical system.
Color development level detector device by both single band and two band limit thermal imaging system requirements, there are many difficulties in application systems prepared from the device to itself. So the overall level of development is far lower than the same type of single-band detector. For example: In 1958, the successful development of a single band of the thermal imaging device, the first color HgCdTe detector 1972, was developed; Currently, long wave HgCdTe detector array surface reached 640 × 480, the multi-layer heterostructure preparation HgCdTe junction thin film material, the integrated color sensor reaches only 64 × 64. However, 3 to 5 micrometers and 8 to 14 microns in the two-band thermal imaging system Europe and the United States, particularly in the sea, in the air has been more common to use. Carrier-based fighter F-14D aircraft carrier in the US Navy equipped with two-band FLIR system. US Navy ship developed light IR surveillance system can respond using 3-5 micrometers and 8 to 14 micron band Kun 480 × 4 membered HgCdTe FPA device. Britain successfully developed color SPRITE detector, and on the basis of TICMⅡ, developed a two-band thermal imaging device; In addition, the ship also is developing two band infrared warning systems. France attaches great importance to the ship with the development of infrared warning system, in 1977 developed the first practical two-band search, tracking system "VAMPIR", and two guided missile destroyers equipped on.
3 color trends detector
development of all detection technology has three stages: a. The intensity of the detection signal to obtain a "black and white" target, which is the initial stage; b. The intensity and wavelength of the probe signal to obtain a "color photo" target, reaching the intermediate stage; c. The detection signal intensity, wavelength and phase to obtain the goal of "hologram", this reached an advanced stage detection technology. The current infrared technology is in its initial stage of late, the forward intermediate stage of development, marked by the development of a dual (multi) color infrared detector, has been "color photo" target thermal image. It is expected that in the future two-color detector will increase with single-band detectors and supporting technologies mature and market demand and accelerate the development, and will focus on the following five areas:
3.1 Integrated
Integrated with a two-color detector system with a simplified structure, we can take full advantage of the latest achievements of semiconductor material preparation techniques, to facilitate the focal plane of the device, wherein the alloy system, and various HgCdTe quantum well / superlattice material system will be the focus of development.
3.2 focal plane
using the focal plane of the device, and better satisfy the requirements of the system, but also help to simplify the system? System configuration and cost reduction.
3.3 a large array
of system performance significantly improved, and the color area array detector will develop long columns.
3.4 miniaturized
dual-band system will overcome the difficulties in the optical design and processing, signal processing and the like of the display, reduce the size, weight reduction, in order to expand its scope of application.
3.5 polychromatizing
with advances in materials, devices and systems technology, the detector will develop more color spectral bands, both spectral band broadening, also includes more detailed spectral band is divided into bands, to achieve the goal of " color "hot images, richer, more accurate and more reliable to get information about the target.