The analysis principle is that the characteristic spectrum of the element to be tested radiated by the light source is absorbed by the ground state atoms of the element to be tested in the vapor of the sample, and the extent of the emission spectrum is weakened, thereby obtaining the content of the element to be tested in the sample, which is in accordance with Lang. Per-Bill law
A= -lg I/I o= -lgT = KCL
Where I is the transmitted light intensity, I0 is the emitted light intensity, T is the transmittance, and L is the light passing through the atomizer optical path since L is a constant value so A = KC.
The physical principle is:
The atoms of any element are composed of nuclei and electrons moving around the nucleus. The electrons outside the nucleus are layered according to the level of their energy to form different energy levels. Therefore, a nucleus can have multiple energy levels.
The lowest energy level is called the ground state level (E0 = 0), the other energy level is called the excited state level, and the lowest excited state is called the first excited state. Under normal conditions, the atoms are in the ground state, and the extranuclear electrons move in the orbit with the lowest energy.
If a certain external energy, such as light energy, is supplied to the ground state atom, when the external light energy E is exactly equal to the energy level difference E between the ground state and a higher energy level in the ground state atom, the atom will absorb light of this characteristic wavelength. The outer electrons transition from the ground state to the corresponding excited state to produce an atomic absorption spectrum.
After the electron transition to the higher energy level, it is in an excited state, but the excited state electron is unstable. After about 10-8 seconds, the excited state electron will return to the ground state or other lower energy level, and the energy absorbed by the electron transition. Released in the form of light, this process is called atomic emission spectroscopy. It can be seen that the atomic absorption spectroscopy process absorbs radiant energy, while the atomic emission spectroscopy process releases radiant energy.
Many of the user interface products designed and manufactured by CSI will eventually live in extremely harsh environments. Some being exposed to UV exposure from the sun for days, months or even years at a time. Luckily, there are methods to protect the keypad from the effects of the sun. One of these methods is using a UV Resistant Coating.
A UV resistant coating is typically applied to the keys. The coating is glossy in appearance and looks very similar to epoxy coatings that were once used on membrane switches. The major difference between the UV resistant coating and the epoxy coating however, is that the epoxy was not durable. Over time, the epoxy not only became embrittled but it tended to discolor and yellow.
The UV resistant coating is designed with special barrier resins and compounds that are activated with ultraviolet light. Once activated, they prevent any damage from occurring to the coating or the base material of the keypad.
The UV resistant material`s [glossy-like" look also enhances the appearance of keypads. The glossy and clean look of the material really makes the product snap and stand out. Between the UV resistant benefits and the enhanced aesthetics, using the UV coating is really a no-brainer when designing a keypad that is going to be used outdoors.
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Dongguan Nanhuang Industry Co., Ltd , https://www.soushine-nanhuang.com