1. While giving the minimum illumination of the camera, the required value of the aperture F is also given, and the zoom lens generally only gives the maximum value of 1:F, that is, the minimum value of the aperture F (the maximum size of the aperture), F= f/D, then D is a fixed value, and when the focal length of f is increased by 10 times, F becomes large (that is, the actual size of the aperture becomes small). Luminous flux will be greatly affected
2. When using an auto iris lens, automatic gain control or automatic electronic shutter camera, the lens aperture F value will also change. For example, if there is a scene near the camera, it will reflect back to the camera, or there will be a light-illuminating camera nearby. At this time, the sensitivity of the camera will be reduced, the size of the auto-iris will be turned off, and the luminous flux will be greatly affected.
3. The minimum illumination given by the camera. What is the minimum illumination concept here? The video signal produced by the camera is nominally 1V, the standard value is 0.7V, and the video signal value at the lowest illumination is 1/3-1/2 standard. Therefore, the image of the camera at the lowest illumination will never be "like a white."
4. The protective cover also has an effect on the effect of the infrared light. In the transmission process, the transmittance and reflectivity of the infrared light are different through different media. Different window glass, especially automatic defrost coated glass, has different attenuation of infrared light.
With the rapid development of infrared night vision system for infrared waterproof cameras, the supply of infrared lamps will increase, but the red light products are not as easy as some people think. The conditions in technology, testing equipment and so on are different. I hope users Compare more and compare carefully. To use the infrared waterproof camera infrared light, the user must first read the instruction manual carefully, especially the precautions for ensuring the safety of personal equipment. Check whether the matching aspects described above meet the requirements, and whether the influencing factors should be taken into consideration, if the requirements are not met, the equipment used can be adjusted in time.
Users should not increase the supply voltage without authorization, because the infrared waterproof camera infrared lamp is designed to take into account its full irradiance and its safety and reliability. Increasing the power supply voltage may cause the infrared light to burn out, and the infrared light should not be removed. If you do this, the manufacturer may no longer be responsible for repairs. If there is a problem with the infrared waterproof camera infrared light, contact the manufacturer or supplier.
5. The image sharpness produced by the camera at the minimum illumination is measured by the TV signal test card. The black and white stripes require black reflectance of nearly 0% and white reflectance of more than 89.9%. We are at the scene. Observed sometimes does not have such conditions, such as: the reflectivity of leaves and grass is very low, the contrast is small, it is not easy to get a clear image.
DUPLEX STAINLESS STEEL
Duplex Stainless Steels Available
Yuhong Group supplies LDX2101, 2205, Ferralium 255, Zeron 100 and LDX2507 in the form of plate, sheet, strip, bar, pipe, tubing, pipe fittings, flanges and weld wire.
Duplex Stainless Steel Overview
Duplex Stainless Steels, also referred to as austenitic-ferritic stainless steels, are a family of grades with about equal proportions of ferrite and austenite. These steels have a duplex microstructure which contributes to their high strength and high resistance to stress corrosion cracking. Due to their high content of chromium, nitrogen and molybdenum, duplex steels offer good resistance to local and uniform corrosion. Duplex stainless steels have good weldability.
Today, modern duplex stainless steels can be divided into three groups:
Lean Duplex such as LDX2101
Standard Duplex such as 2205, the work-horse grade accounting for more than 80% of duplex usage
Super Duplex such as Ferralium 255 and Zeron 100 and LDX2507
Of the duplex grades, duplex 2205 is the most widely used. However, the super duplex steels like Zeron® 100 and LDX2507 are excellent for servicing severe corrosive environments, such as offshore and marine applications. Lean duplex 2101 is available as an economic alternative to 300 series stainless steels.
What are the Characteristics of Duplex Stainless Steels ?
Very good resistance to uniform corrosion
Very good resistance to pitting and crevice corrosion
High resistance to stress corrosion cracking and corrosion fatigue
High mechanical strength
Good sulfide stress corrosion resistance
Good abrasion and erosion resistance
Good fatigue resistance high energy absorption
Low thermal expansion
Good weldability
In what Applications are Duplex Stainless Steels® used ?
Oil and gas equipment
Offshore technology
Seawater desalination plants
Chemical industry, especially when handling chlorides
Flue-gas cleaning
Desalination plants and seawater systems
Pulp and paper industry
Cargo tanks and pipe systems in chemical tankers
Firewalls and blast walls on offshore platforms
Bridges
Storage tanks
Pressure vessels, reactor tanks, and heat exchangers
Rotors, impellers and shafts
Duplex Steel Fitting,Duplex Steel Pipe Fitting,Duplex Stainless Steel Fitting
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