There are many types of beds we usually use, such as single beds, double beds, children's beds and so on. The size of each bed is different, so the mattress should also be made to the corresponding size. Therefore, the size of the mattress is also varied, so what types of mattress size standards? What are the factors that affect the size of the mattress? Just go and go to go to the specific website.

In life, the bed we use the most is the double bed. In general, the size of the double bed is 2000*1800mm and 2200*2000mm. Both of these double beds are extremely large in size, so the standard size of the mattress is the same as the two sizes. When we buy the mattress, the merchant will give us the corresponding size according to the size of our own bed. recommend.

Most of the students use single beds, and there are many types of single beds, which are divided into middle school students and children's beds. The size of the middle school students' bed is generally 2000*1200mm, so the standard size of the middle school students' mattress should also be 2000*1200mm, but the height of the mattress is different from that of the double bed. The middle school students are in the development stage, so the mattress should not be too thick, generally half the height of the standard size of the double mattress, and not too soft.

For children's beds, many parents use mat mattresses. The mat is also a kind of mattress. Generally speaking, the size of the children's bed is 1800*1200mm. The standard size of the children's mattress is 1800*1200mm, and the thickness of the mattress should also be half of that of the double mattress. It is reminded that all parents are still unable to use the mattress at the stage of physical development, which has drawbacks for the child's bone development.

Simmons has always been one of the leading brands in mattresses. What is the standard size of Simmons mattresses? At present, the standard size of Simmons mattresses is: 1900*900mm, 1000*1900mm, 1200*1900mm, 1800*1200mm, 1800*2000mm, 1500*1800mm, etc. If you don't have what you want, you can choose to order it, which is very convenient.

The above is the standard size of the mattress introduced by Xiao Jiaju.com. Before buying a mattress, it is best to measure the size of your bed and then talk to the shopping mall's shopping guide about what kind of mattress you want to buy. The guide will be able to choose the mattress you like according to your requirements.

PassiveInfrared Ray

It is mainly made of a material with high pyroelectric coefficient, such as lead zirconate titanate ceramics, lithium tantalate, triglyceride titanium sulfate, etc. to make the detection element with a size of 2*1mm. Install one or two detection elements in each detector, and connect the two detection elements in series with reverse polarity to suppress the interference caused by the rise of their own temperature. The detection element converts the detected and received infrared radiation into a weak voltage signal, which is amplified by the field effect tube installed in the probe and output outward. In order to improve the detection sensitivity of the detector and increase the detection distance, a Fresnel lens is generally installed in front of the detector. The lens is made of transparent plastic. The upper and lower parts of the lens are divided into several equal parts. It is a kind of lens with a special optical system. It can amplify the signal by more than 70 decibels in cooperation with the amplifying circuit, so that the movement of people within 20 meters can be measured.
The Fresnel lens uses the special optical principle of the lens to produce an alternating "blind zone" and "high-sensitivity zone" in front of the detector to improve its detection and reception sensitivity. When someone walks in front of the lens, the infrared rays emitted by the human body will alternate from the "blind area" to the "high sensitive area", so that the received infrared signal is input in the form of sudden strong and weak pulses, thereby strengthening its energy amplitude .
The central wavelength of infrared radiation radiated by the human body is 9~10--um, and the wavelength sensitivity of the detection element is almost stable in the range of 0.2~20--um. A window equipped with a filter lens is opened at the top of the sensor. The wavelength range of light that this filter can pass is 7~10--um, which is suitable for the detection of human infrared radiation, and other wavelengths of infrared rays are filtered. The sheet is absorbed, thus forming an infrared sensor specially used to detect human body radiation.

PassiveInfrared Ray,Pyroelectric sensor,Highly sensitive sensor

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