When deploying wireless surveillance, point-to-multipoint transmission methods are often used in terms of cost savings and simplified construction. What do you mean by point-to-point, what you need to pay attention to in the deployment process and how to achieve good transmission results... These are all related to the success of the wireless monitoring.
Point-to-multipoint, a point-to-multiple point, can be multiple transmitters to one receiver, or it can be a transmitter to multiple receivers, according to the needs and monitoring needs. Not much used is that multiple transmitters correspond to one receiver.
Regarding its considerations, Feng Runda, a professional wireless bridge equipment and solution provider, sums up the following related considerations.
1, can not be too far away
In order to ensure a good transmission effect, it is beneficial to set the angle between the transmitter and the receiver. Generally, the distance cannot be too far. It is better not to exceed 5 to 10 kilometers, and the best effect is within 5 kilometers.
2, the angle should be reasonable
Since multiple transmitters correspond to one receiver, the perspectives of the receiver bridge and the transmitter bridge are very important. It is generally 30°, 60°, 90°, 120°, 180°, and the like. If the angle is not set properly, some monitoring data of the camera may not be transmitted or the transmission effect is not good. The specific angle can be determined according to the actual situation, and can be determined by the distance between the transmitter and the receiver and the dispersion of the transmitters.
3, no more than 1 pair of 8
Point-to-multipoint transmission, a receiver bridge can correspond to multiple transmitter bridges, but this ratio can not be too large, otherwise it will make the transmission effect compromised, and the receiver can not afford to look at so much data. Therefore, it is best not to exceed the ratio of 1:8, usually the best 1:4 and 1:5.
4, camera pixels should not be too high
The code stream determined by the camera pixel level can be understood as the network bandwidth that will be occupied. The higher the pixel number of the camera is, the larger the code stream is. When multiple transmitters transmit the monitoring data of the camera to the receiver bridge, the data will be very large, the receiver bridge may not be able to bear, and it will result in packet loss, severe delay, etc. phenomenon. So that kind of ultra-high definition camera is definitely not suitable for use in point-to-point transmission.
5, the bridge's bandwidth can not be too low
This point is similar to the above mentioned principle that the pixels of the camera cannot be too high. The higher the transmission rate of the bridge, the greater the bandwidth, the possibility of transmitting more monitoring data and making the monitoring picture smoother.
The above five points comprehensively summarize the points of attention of wireless bridge point-to-multipoint transmission. As long as you really understand it, you can freely deploy wireless bridges.

Natural Graphite


Natural Graphite, as its name implies, is naturally formed by natural graphite, which is generally found in graphite schist, graphite-gneiss, graphite-bearing schist and metamorphic shale.

Features

The chemical composition of graphite is carbon (C). Naturally produced graphite is rarely pure and often contains impurities, including SiO2, Al2O3, MgO, CaO, P2O5, CuO, V2O5, H2O, S, FeO and H, N, CO2, CH4, NH3, etc. Natural graphite minerals are black, steel gray, striated black; Metallic luster, crypto, dull, opaque; The hardness is isotropic, the vertical cleavage surface is 3 ~ 5, the parallel cleavage surface is 1 ~ 2; Qualitative soft, density is 2.09 ~ 2.23 g/cm3, have the feeling of greasy, easy to contaminate finger. Mineral chip under the transmitted light is generally not transparent, extremely thin can pervious to light, the light green gray, refractive index of 1.93 ~ 2.07, under the reflected light is light gray, reflective pleochroism, Ro gray with brown, Re dark blue gray, reflectivity Ro23 (red), Re5.5 (red), the reflected color, double reflection were significantly, strong heterogeneity, polarization color for straw yellow.

Graphite is a complex six-party double cone, assumes the six-party tabular crystal, common simplex are parallel double, six-party double cone, hexagonal prism, but in good condition with rare crystal forms, the generally show scaly or platy, aggregate density lump, earthy or globular.

Type

The process performance and usage of graphite is mainly depends on the degree of crystallization, in accordance with its natural graphite crystal morphology can be divided into crystalline graphite, Flake Graphite) and aphanitic graphite (earthy graphite) two types of industry.

Crystalline graphite

In the crystalline (scale) graphite ore, the diameter of graphite crystals is greater than 1 mu m. Ore grade is low, but optional; The mineral associated with graphite is usually mica, feldspar, quartz, diopathic stone, diabase, garnet and a small amount of pyrite, calcite, etc., some of which have some useful components, such as rutile and vanadium. The ore is scales, grainy scales or granulocyte structures, flaky, flaky, or blocky structures.

Crystalline (scale) graphite is divided into High Purity Graphite, high carbon graphite, medium carbon graphite and low carbon graphite according to the fixed carbon content.

The high purity graphite (fixed carbon content is greater than or equal to 99.9%) is mainly used for flexible graphite sealing material, nuclear graphite, instead of platinum crucible for chemical reagent melting and lubricant base material, etc.

High carbon graphite (fixed carbon content 94.0% ~ 99.9%) is mainly used for refractory materials, lubricant substrate, brush raw materials, carbon products, battery raw materials, pencil materials, filling materials and coatings, etc.

Carbon graphite (80% ~ 94% fixed carbon content) is mainly used for crucible, refractories, casting materials, foundry coatings, pencil raw materials, battery materials and dyes, etc.

Low carbon graphite (fixed carbon content 50.0% ~ 80.0%) is mainly used for foundry coatings.

Cryptocrystalline graphite

Cryptocrystalline graphite is also called soil graphite or amorphous graphite. In cryptocrystalline graphite ore, graphite crystals are less than 1 mu m in diameter, which are microcrystalline and can only be seen in the electron microscope. High grade of ore, but poor selectable; The mineral associated with graphite is often quartz and calcite; The ore is microscaly - cryptocrystalline structure, block or soil structure.

Cryptocrystalline graphite ore is mainly distributed in contact metamorphic deposits. Actually the diameter graphite flake graphite ore is uneven, the so-called crystalline graphite ore, may also contain the aphanitic graphite, are too many content is often referred to as the mixed type graphite ore, may also contain a small amount of aphanitic graphite quality mineral crystalline flake graphite piece diameter slightly larger than 1 microns.

Cryptocrystalline graphite ore is mainly used in pencil, battery, electrode, graphite emulsion, graphite bearing ingredients and the raw materials of battery carbon rod. The non-ferrous graphite is mainly used for casting materials, refractory materials, dyes and electrode paste.

Natural Graphite




Natural Graphite,Expanded Graphite,Colloidal Graphite,Special Graphite

Fengcheng Ruixing Carbon Products Co., Ltd , https://www.lnfcrxts.com

October 23, 2021