>> The most important for the selection of sound insulation
As the weather gets warmer, noise from different sources begins to infest people's normal lives. How to better solve, in general, is the window should be strictly sealed, whether you are a single window or double window, the seal is the most important, the sound insulation effect is determined by the weakest link. From the current technological level, using steel windows as a means of sealing is the most effective renovation program. For users who have already adopted aluminum alloys, it should be ensured that the seal of the aluminum alloy frame is intact. In contrast, aluminum alloy windows have poorer sealing than plastic windows.
The window seal is solved. The next step is to make it more sealed. After all, the sound insulation is not sealed. It also depends on the sealing performance. The use of hollow glass in plastic windows is a very effective method. Because the most noisy person is often the high-pitched part, and the high-pitched sound is transmitted in a straight line, most of the reflections can be made with glass. Insulating glass can be used to make the non-reflective part use up.
For the vibration of these mid-bass and bass, we can use carpets, fabrics, or even sound-absorbing cotton to reduce their impact on the interior. Adding pads at the foot of the bed can also reduce the vibration. At the same time, the use of palm pads in mattresses is better than spring mattresses. Of course, hard bed boards are much less. At present, some houses use lightweight bricks (hollow bricks) as exterior walls. These materials have poor sealing performance. If the noise on the road side is very influential, they can also do a woodwork (light steel) on the walls of the street. The paper gypsum board is filled with a sandwich of sound-absorbing cotton, and then a decorative surface such as wallpaper is used.
Of course, no matter how you do sound insulation, don't forget about proper ventilation. A too closed environment is as unhealthy as sleeping. Noise should be prevented on one side facing the noise, and ventilation should be properly maintained on the opposite side. Finally, in the purchase of a house, noise should also be taken into account. Observe the noise environment of the house to be purchased at different times and determine the extent of the impact based on your actual situation.
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Specification of our optical meniscus spherical lens as follow:
*Material BK7,CaF2 crystal,MgF2,Ge,BaF2 lens,ZnSe or other optical materials
*Dimension Tolerance +0.0 - -0.1mm
*Center Thickness +/-0.1mm
*Focal Length Tolerance+/-1%
*Surface Quality:60/40
*Surface Figure:lambda/2 at 633nm on plano side
*Clear Aperture >90%
*Chamfer 0.25mm at 45 degree typical
*Coating Optional
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