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Analysis on the way of Adjusting Resistance

Le 30 janvier 2018, 09:45 dans DIY 0

Potentiometer is used to adjust resistance: potentiometer is a component that can adjust and change the resistance value arbitrarily, but using potentiometer to adjust resistance is inefficient, the accuracy of resistance control is not easy to control, and the labor cost is large.

Laser trimming resistance substrate by cutting short pulse 10mw laser pointer scanning, the resistor paste layer by laser heating gasification, the formation of a certain depth of the notch, thus changing the conductive cross-sectional area of the resistor body and the conductive length reached to below the target resistance to allow the body repair resistance deviation range, suitable for rapid mass production resistance.

Sandblasting and resistance control: the resistance substrate is polished by spraying sand flow, so that the resistance slurry layer is worn, thus changing the conductive section area and the conductive length of the resistor body, and achieving the required resistance. Sand spray resistance is a conventional resistance adjustment scheme. The equipment price is low, but the precision of resistance adjustment is not easy to control, the speed is slow, and it is not easy to automate and batch production.

red laser pointer

The team uses a beam of laser to capture and move particles, and then controls the laser to create images. They take advantage of a near invisible light field to capture and move small particles and pass them through a space. When particles move, they are irradiated by red, green and blue 500mw laser pointer, and map the surface of the object to make it imaging. When the velocity of the particle moves fast enough, the three-dimensional stereoscopic image will be produced and the color gamut is large and the fineness is high. The speed is a little faster, and the objects in the image look like moving. This image can coexist with the entities in the same physical space and can be seen from any angle, which is not realized by the holographic technology at present.

The research team has developed so far the most delicate mirror -- only one atom thick molybdenum selenide (MoSe2) thin section, the miracle of engineering will limit the physical world and a step forward. The researchers said that this thin mirror can be developed for the special sensor is very small, and the use of 50mw laser pointer information transmission computer chip.

Scientists have explained that if electrons collide with a proton or light particle in the atom, electrons will probably move from the low level orbitals to the high level orbitals, so that an electron hole pair will form in the electric field. When exposed to light at certain wavelengths, the electrons around MoSe2 are likely to jump. The electrons are negatively charged, while the protons in the nuclei are positively charged. Therefore, these electron hole pairs will draw positive charges from the proton, making the behavior of holes behave like particles. The electronically negative electrons in the vicinity attract these "false" particles and, in some cases, pair up to form a quantum mechanical object called excitons. These excitons themselves release light, interact with the incident light and send them back in the way they are incident. In this way, these MoSe2 slices can work like a mirror.

According to reports, the ultra-short ultra-short laser in the laboratory to create an unprecedented super-electromagnetic field, ultra-high energy density and ultra-fast time scale comprehensive extreme physical conditions in the desktop accelerator, ultrafast chemistry, attosecond science, materials Science, 200mw laser pointer fusion, nuclear physics and nuclear medicine, laboratory astrophysics and other fields have great application value.

Key Points of Laser Cutting Machine with Alloy Fiber

Le 18 décembre 2017, 12:43 dans Humeurs 0

Fiber laser: it is the most important part of the optical fiber laser cutting machine, and it is the "power source" for the optical fiber laser cutting machine to realize the cutting operation. Compared with other types of laser pointer, fiber laser has the advantages of higher efficiency, longer service life, less maintenance, lower cost and so on.

Cutting head: the cutting head of a laser cutting machine is a laser output device, which is composed of a nozzle, a focusing lens and a focusing and tracking system. The cutting head of laser cutting machine will walk according to the set cutting path, but the height of laser cutting head needs adjusting control under different material, thickness and cutting mode.

red laser pointer

Servo motor: a servomotor is an engine that controls the operation of mechanical components in a servo system. It is a kind of auxiliary motor indirect transmission. The servo motor can make the control speed, the position precision is very accurate, the voltage signal can be converted to torque and speed to drive the control object. The high quality servo motor can effectively ensure the cutting precision, positioning speed and repeated positioning precision of the laser cutting machine.

Cold water machine: the cold water machine is the cooling device of the 500mw laser pointer cutting machine. It can quickly and efficiently cool the laser, spindle and other devices. The current chiller has the advanced functions of the input and output control equipment switch, the cooling water flow, the high and low temperature alarm, and the performance is more stable.

Gas supply system: the gas supply system of the optical fiber laser cutting machine mainly includes the gas source, the filter device and the pipeline. The gas source has two kinds of bottled gas and compressed air.

Host: the body of the laser cutting machine, the beam, the worktable, the Z axis system and so on are all known as the mainframe. When laser cutting machine cuts, it first puts the workpiece on the lathe bed, then uses the servo motor to drive the crossbeam to control the movement of the Z axis. Users can adjust the parameters according to their own needs.

Control system: mainly control machine tools to realize the movement of X, Y and Z axis, and also control the output power of the laser.

Steady voltage power supply: connected to the 10mw laser pointer, the CNC machine tool and the power supply system. It is mainly to prevent the interference from external power grid.

Simultaneous Multiphoton Absorption

Le 13 novembre 2017, 10:37 dans Écologie 0

Laser welding technology through a very short period of time in the rapid positioning, greatly reducing the production of the beat, the smaller the amount of heat to ensure that the assembly after welding deformation is small, more conducive to product quality improvement. From the market growth point of view, according to the type of blue laser pointer, the next five years, the fastest growing market is the direct semiconductor lasers, mainly kilowatt-class high-power semiconductor lasers; growth is the second fastest quantum cascade laser, this laser advantage Obviously, widely used, especially in anti-terrorism, security and other applications play an important role in the future of the global quantum cascade lasers will have a huge demand. Fiber lasers will always maintain a steady growth rate.

green laser

There are some highly reflective materials, such as copper and other rare metal materials, this type of material although able to use fiber laser cutting machine for cutting, but because of these materials for the laser wavelength is not the ideal absorption range of these materials, will reflect Part of the energy burned to protect the lens, which is also need to pay attention. Currently on the market of fiber laser cutting machine equipment is mainly for the thin plate cutting, cutting in the 16mm below the advantages of thin plate is very obvious, and in the cutting plate when the efficiency is relatively low, which is subject to the power of fiber lasers.

In recent years, an exciting alternative process has been put into industrial applications, that is, ultra-fast laser pointer in the near infrared wavelength range generated sub-second pulse. In this method, the ultrashort pulse is closely focused on most of the glass or surface, and the power density per square centimeter exceeds the number of tiles, causing complex and diverse processes such as simultaneous multiphoton absorption, avalanche and collision ionization, resulting in a glass The matrix is highly localized by the destruction while almost no energy deposition (only a few microfocus or less). Since the energy used for each pulse is extremely modest, the thermal effect on the part (or even the volume of the focus) is negligible.

As the high energy density positron research in the military, materials, energy and other fields of science has important strategic significance and application prospects, the field has become the international high-energy physics research hot and difficult. Einstein's energy equation tells us that matter and energy can be transformed into each other. According to the quantum electrodatics we have known that super-intense green laser can tear the vacuum to produce positive and negative electron pairs, but the required laser intensity is at least seven orders of magnitude higher than the laser energy available in the current laboratory.

The quality assurance after hardening treatment involves authorizing a partner to use the laboratory quality identification and other technical means to determine the processing results, and through the metallographic method to verify the results. At the same time, this cooperation also plays a role in the development of the products required by the user, such as the reliability test of the stability of the tool and the inspection of the cutting capacity in the specific workplace. Only advanced research to make the smooth end of the work, can begin to accept the user parts of the laser hardening of the commission. Common laser quenching process on the market and a certain amount of red laser pointer feed to adjust the tool to achieve the same quality level.

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