Optical fiber jumper (also known as optical fiber connector) means that both ends of the optical cable are equipped with connector plugs to realize the active connection of the optical path; one end with a plug is called a pigtail. Fiber optic jumpers are similar to coaxial cables, except that there is no mesh screen.
In the center is the glass core through which light propagates. In a multimode fiber, the diameter of the core is 50μm~65μm. The single-mode fiber core has a diameter of 8 μm to 10 μm. The core is surrounded by a glass envelope with a lower refractive index than the core to keep the optical fiber in the core. On the outside is a thin plastic jacket to protect the envelope.
The fiber jumper is the fiber connector that is connected to the optical module. There are many types, and they cannot be used mutually. The SFP module is connected to the LC fiber optic connector, and the GBIC is connected to the SC fiber optic connector..jpg)
The following is a simple analysis of several commonly used optical fiber connectors in network engineering:
1. FC type optical fiber jumper: The external strengthening method is a metal sleeve, and the fastening method is a turnbuckle. Generally used on the ODF side, the most used on the distribution frame.
2. SC type optical fiber jumper: the connector that connects to the GBIC optical module, its shell is rectangular, and the fastening method is a plug-in latch type, without rotation. Most used on router switches.
3. ST-type optical fiber jumper: often used in optical fiber distribution frame, the outer shell is round, and the fastening method is turnbuckle. For 10Base-F connections, the connector is usually of the ST type. Commonly used in optical fiber distribution frames.
4. LC-type optical fiber jumper: the connector for connecting the SFP module, which is made of a modular jack (RJ) latch mechanism that is easy to operate. Routers are commonly used.
The nanocrystalline core is a small part with magnetic permeability. The center of the nanocrystalline core has small nanocrystalline grains. The working principle of the nanocrystalline core is to absorb the common mode current in the cable through the principle of induction heating. And converted into heat to dissipate.
The use of common mode inductance of nanocrystalline core material can well suppress the peak voltage, thereby protecting sensitive components, while reducing the motor shaft voltage. Because of the unique characteristics of nanocrystalline cores, it is very useful in some high-power system industries. Good application.
Product performance of nanocrystalline cores:
In the field of electric energy meters, power meters, ammeters, electrical measuring equipment and other instruments and meters. Various types of power current transformers in power transmission and distribution power monitoring systems. Leakage protection, relay protection, servo motor protection, fire monitoring, etc.
Current and voltage data sampling, etc.
Application areas of nanocrystalline cores:
Mainly used to make miniature precision current transformers, power current transformers, Hall sensors, open-close current transformers, power transmitters, etc.
Nanocrystalline core terminals are used in:
Electric energy meters, power meters, ammeters, electrical measuring equipment and other instrumentation fields. Various types of power current transformers in power transmission and distribution power monitoring systems. Current and voltage data sampling for leakage protection, relay protection, servo motor protection, fire monitoring, etc.
scotch duct tape is made on the basis of the original BOPP film after high-voltage corona to make one surface rough, then coated with glue, and divided into small rolls after slitting. This is the tape we use daily. The glue of scotch duct tape is acrylic glue, also called pressure-sensitive adhesive, and the main component is tincture. Tincture is a kind of macromolecular active substance, and the temperature will have a certain influence on molecular activity. The tincture content of the glue directly affects the use of the tape. The initial adhesive force of normal sealing tape is between No. 13 (steel ball number). The thickness of this tape glue is generally 22 microns, which is a standard thickness.
Colored tapes are used for marking and masking purposes. Generally, beige and khaki are more common. Pinch the scotch duct tape and then quickly pull it apart, you can pull off the glue on one side, and you can see the purity and transparency of the original film.
In our lives, when we encounter scotch duct tape after using it for a long time, it will leave some traces. How should we deal with it?
1. Alternate covering of new and old transparent glue is an effective method. Just use new transparent tape to stick under the old tape. This method is more practical.
2. Wipe with an eraser. This is the method we all used when we were young. You can easily remove traces by wiping with an eraser where there is glue.
3. Skin care products. Some of the substances in it are very effective in removing the traces left by the transparent glue, but it should be noted that it is better to use expired skin care products, otherwise it is very wasteful.
4. Dishwashing liquid is also one of the tools to effectively remove the traces of transparent glue.
How to improve the lifespan of alkaline battery has always been the focus of research in the battery industry. Among them, the composition, type, porosity, plate size, grid material and structure of the active material are internal factors that affect the life of alkaline battery, while the depth of discharge, overcharge level and temperature are external factors.
1. The influence of temperature. The lifespan of alkaline battery increases with increasing temperature, because the capacity increases with increasing temperature. If the discharge capacity does not change, then when the temperature rises, the depth of discharge is reduced to extend the lifespan. Between 10-35 Celsius, the temperature rises by one Celsius, an increase of 6 cycles. Between 35-45 Celsius, each Celsius of temperature rise can extend the lifespan by more than 25 cycles. When the temperature is higher than 50 Celsius, the lifespan is shortened due to the loss of cathode vulcanization capacity.
2. Depth of discharge. The depth of discharge means that the discharge starts to stop when it reaches a certain level during use, and 100% depth refers to the discharge of all capacity. The lifespan of alkaline battery is greatly affected by the depth of discharge. Because the anode active material lead dioxide itself is not firmly bonded to each other, lead sulfate is generated during discharge, and returns to lead dioxide during charging. The molar volume of lead sulfate is larger than that of lead oxide, so the volume of the active material expands during discharge. Therefore, the deeper the depth of discharge, the shorter the cycle life.
3. The degree of overcharge. A large amount of gas is released during overcharging. At this time, the active material of the positive plate is impacted by the gas, and this impact will promote the active material to fall off. In addition, the positive grid alloy is also subject to severe anodic oxidation and corrosion, so the service life of alkaline battery will be shortened when overcharged.
Only by strictly and comprehensively controlling the internal and external factors that affect alkaline battery can alkaline battery with longer lifespan be produced.
The leakage of alkaline battery has a very important relationship with the structure of the battery. Because the cathode active material is zinc powder, it greatly increases the real surface area of the cathode and increases the battery capacity. But at the same time, it is prone to corrosion. There is a lot of gas generated inside the battery. When the internal pressure is too high, the strong pressure may deform the parts at the seal and cause the battery to leak.
In order to prevent the leakage of alkaline battery, alkaline battery manufacturers usually take the following measures in the production:
1. Apply sealing glue. Since the contact surfaces of the seals are not all really flat and there are many capillary channels, sealing glue must be applied between the steel cylinder and the sealing ring and the center of the sealing ring to block the capillary channels.
2. Improve the sealing structure and sealing process. Since the outer diameter of the upper part of the sealing ring is tightly fitted with the inner diameter of the flaring part of the steel cylinder, the outer diameter of the lower part of the sealing ring is a loose fit with the inner diameter of the steel cylinder. Therefore, only by axially and radially compressing the upper part of the sealing ring can the sealing purpose be achieved.
3. Improve the sealing ring. The material and structure of the sealing ring are also the main measures to improve the sealing effect. After comparing several common sealing processes and the principle of the sealing machine, it is found that the key to the sealing process is the deformation of the steel shell and the elastic compression of the sealing ring. The compression effect is achieved in the transverse direction, and the purpose of sealing can be achieved.
Prevent the leakage of alkaline battery and do a good job of quality control, so that alkaline battery can always make breakthroughs and walk in the forefront of the battery industry.