Xenon lamp aging testing machine adopts xenon arc lamp that can simulate the whole sunlight spectrum to reproduce the destructive light wave in different environments, which can provide corresponding environmental simulation and accelerated test for scientific research, product development and quality control.

However, for the choice of air-cooled and water-cooled xenon lamp testing machine, many users in the selection of very nerve-wrongheaded, not sure which is more suitable for their own company's product use, below, xiaobian Shanghai biaobiao for you to answer the difference between the two:

I. the structure of the two sample racks is different:

The air-cooled sample rack is palletized, and the height can be manually adjusted. There is no requirement for the shape of the product under test.

Water-cooled rack is rotating disc, can rotate 360 °, but have requirements on the shape of the products tested, must be thin sheets, and suitable for 75 x 150 mm standard sample clamp, and light on the wheel.

Ii. Different lamp tubes and placement:

Air-cooled: 3 imported lamps are used at the same time, the lamp power is 1.8kw/tube, and the lamp service life is about 1600 hours;

Water-cooled type: only one domestic lamp tube is used, the lamp tube power is 6KW/ tube, and the lamp tube service life is about 500 hours.

3. Different radiation intensity:

Air-cooled type: radiation intensity: 300W/ m2, relatively suitable for "indoor products";

Water-cooled: radiation intensity: 1200W/ m2, suitable for outdoor products.

In addition, xenon lamp aging testing machine mainly USES xenon lamp tube to simulate the sunlight irradiation to test the light fading degree of materials, xenon lamp tube as its main core component has an important role, therefore, it is necessary to understand the influence factors of xenon lamp service life.

Factors influencing the service life of xenon lamp tube:

I. geometric dimensions of xenon lamp

When the same batch of pulse xenon lamp factory, different xenon lamp geometry size has a certain geometric error, the same batch of xenon lamp due to the arc length and the inner diameter of the small deviation led to the largest difference in the life of xenon lamp can reach 1.15 times, the larger the inner diameter of the xenon lamp, the longer the arc length, the longer its life.

Microdefects of quartz glass

In the ignition process of high-power pulsed xenon lamp, the gas in the lamp usually breaks down near the axis of the lamp tube and forms a filamentous conductive channel.When the energy is released into this channel, the heating of surrounding gas causes the filamentous conductive channel to expand rapidly, forming a cylindrical shock wave, which propagates along the axis to the wall of the lamp tube.With the increase of energy and ignition times, the deterioration of tube wall will accelerate.The reason can be attributed to the quartz tube material internal existence of a variety of micro defects, such as micro holes, micro cracks, etc., under the impact effect will continue to nucleate to grow up, produce dislocation, the formation of local hot spots of the material.Therefore, in the pulse xenon lamp material selection to pay special attention to, the inner surface of the lamp can not be open type bubble or gas line, the surface of the lamp and the body material internal microdefects to as few as possible.

Quartz glass stress

The high power pulse xenon lamp usually adopts full doped or composite cerium doped quartz glass tube.When the tube is longer, the tensile stress is mainly distributed near the electrode and the middle part of the tube.Unqualified xenon lamp surface tensile stress is mostly 1.4 ~ 1.6kg/mm2, this xenon lamp in a year after the ignition of 1000 times, the lamp surface of the more cracks, there are annular, inclined or along the tube axial and so on.These lamps had to be replaced after a year of ignition, and xenon lamps with tensile stress less than 0.18kg/mm2 had no cracks after three years of use.Tensile stress also causes the micro-defects on the surface of the lamp to become larger gradually. Although this process is relatively slow, and it usually takes several months to appear, mechanical vibration and plasma impact will accelerate the increase of micro-defects when the xenon lamp is ignited.

Before ignition, xenon lamp tube stress is larger, with stress testing of apparent stress fringe, in the first round of the conventional ignition occurs, and the late xenon lamp tubes by annealing oven to get rid of stress, stress relieving are thoroughly, not only by the routine detection, but also by the explosion life testing, which indirectly proves that the stress is a direct factor leading to the explosion of the xenon lamp.

Xenon purity

The xenon gas is the only working gas in the ignition process of the xenon lamp.In the process of xenon lamp production, if the impurity gas in the lamp is not removed, it will bring many unfavorable factors to the xenon lamp ignition.The most harmful to the lamp is water vapor in the air.If water vapor is not completely expelled from the lamp, the tungsten electrode reacts with water vapor to form WO3 and hydrogen atoms.WO3 evaporates from the electrode and condenses on the lamp tube, which is the main reason for the blackening of the tube wall.In the ignition process, with the increase in the use of xenon lamp, electrode, glass tube wall and other impurities released by the gas pollution of xenon gas, making the xenon lamp ignition voltage increased, eventually led to the xenon lamp can not work properly, shorten the life of the xenon lamp.

5. Electrode sputtering

The evaporation of electrode materials also has a great impact on the tube wall. The tungsten oxide sputtering on the tube wall not only blackened the tube wall, but also absorbed more ionizing radiation, resulting in local heating of the quartz glass tube. After cooling, the inner surface of the quartz tube would be stressed or even cracked, seriously damaging the mechanical strength of the quartz tube.The selection of electrode materials, the heat treatment of electrode rod and the protection of electrode in sealing are particularly important. Composite materials that can reduce the work of tungsten electron escape should be selected as far as possible to reduce the temperature during the use of electrode. At the same time, the electrode rod must be thoroughly degassed, and inert gas should be used to protect the electrode rod in sealing.

Vi. Insulation strength of lamp holder

The insulation strength of the lamp head is an important technical index in the manufacturing process of the pulsed xenon lamp. If the insulation material of the lamp head cannot withstand the impact of high voltage and high current when the xenon lamp is ignited, the lamp head will be broken down, and even the xenon lamp will explode, affecting the normal operation of the chip amplifier.Insulation potting material of insulation should be selected first option of the insulating material, secondly the mechanical strength of insulating potting material also should have certain requirements, the need to be able to withstand the ignition process of a huge impact, once the insulating material is torn, impact dielectric strength again good potting material will lose its insulating effect.

Lamp head sealing reliability

There are two common sealing methods of xenon lamp: transition glass sealing and metal brazing sealing. The reliability of sealing directly affects the purity of xenon gas inside the xenon lamp. If the sealing quality is not good, the air directly enters the inside of the xenon lamp and polluts the xenon gas, then the xenon lamp will fail to ignite.

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