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紫外线光谱细分（UVA、UVB、UVC）

1932

（图片仅供参考）

这紫外线紫外线光谱通常分为UVA（400–315纳米）、UVB（315–280纳米）和UVC（280–100纳米）。UVA，即长波紫外线，能量最低，穿透皮肤最深。UVB，即中波紫外线，会导致晒伤，对皮肤健康至关重要。维生素D 合成。UVC，或称短波紫外线，能量最强，杀菌效果最显著，但会被地球大气层完全吸收。

The division of the 紫外线 spectrum into distinct bands is based on their wavelength and corresponding biological effects. This classification, standardized by bodies like the International Commission on Illumination (CIE), is crucial for understanding UV’s impact on living organisms and materials. UVA (long-wave) is the most prevalent UV radiation reaching the Earth’s surface (~95%), as it is less affected by the ozone layer. It penetrates into the deeper layers of the skin (dermis) and is primarily responsible for skin aging (photoaging) and can contribute to skin cancer. UVB (medium-wave) is partially absorbed by the ozone layer. It primarily affects the outer layer of the skin (epidermis), causing sunburn, DNA damage, and is the main driver for most skin cancers, but it is also the specific wavelength range that initiates 维生素D production. UVC (short-wave) has the highest energy and is extremely dangerous to living organisms. Its photons have enough energy to break molecular bonds, making it a potent mutagen and germicide. Fortunately, UVC from the sun is entirely absorbed by oxygen and ozone in the stratosphere and does not reach the Earth’s surface. A further category, Vacuum UV (VUV), spans from 100 to 200 nm and is so named because it is strongly absorbed by air (specifically molecular oxygen), requiring a vacuum for it to propagate. These subdivisions are not just academic; they are fundamental to fields ranging from public health and dermatology to industrial applications like sterilization and polymer curing.

环境工程, 环境影响, 光学, 光子学, Solar, Sustainability

UNESCO Nomenclature: 2210

– Optics

类型

Classification System

中断

重大的

用法

广泛使用

前体

Discovery of 紫外线辐射 by Johann Ritter
发展光谱学以及精确的波长测量
光的生物效应的早期研究（光生物学）
臭氧层及其特性的发现

应用程序

防晒配方（UVA/UVB防护）
uv germicidal irradiation (uvc)
皮肤病光疗（UVB）
日光浴床（UVA）
测试紫外线降解的材料科学
维生素D合成研究

专利：

潜在创新理念

多光谱防晒霜可根据检测到的 UVA/UVB 比例调整防护等级
智能服装采用集成纤维，通过改变颜色来指示累积的紫外线照射
用于医院和公共交通消毒的基于 UVC 的自主机器人
室内垂直农场的选择性 UVB 发射器可优化农产品中的维生素 D 含量
配备紫外光谱仪的无人机实时监测大气臭氧层健康状况
UV-A LED 阵列用于固化 3D 打印生物组织且不损伤细胞
集成 UVC-LED 的家用水系统，用于即时消毒
含有UVA活化化合物的抗衰老化妆品
用于牛皮癣和白癜风家庭治疗的 UVB 治疗设备
可过滤紫外线并监测眼压的隐形眼镜

Related to: uva, uvb, uvc, ultraviolet spectrum, wavelength, photobiology, dermatology, ozone layer, germicidal, vitamin d.

历史背景

Thermodynamics laboratory with various thermometers and calibration equipment.

热力学第零定律

该定律确立了热平衡的概念。如果两个系统分别与第三个独立系统处于热平衡，则它们彼此之间也处于热平衡。这种传递性使得温度可以正式定义为状态函数，并为构建温度计和通用温标提供了合理的基础。

Laboratory experiment demonstrating London dispersion force in noble gases.

伦敦分散部队

The London dispersion force (LDF) is the weakest type of Van der Waals force, arising from quantum mechanical fluctuations in the electron clouds of atoms and molecules. These fluctuations create temporary, instantaneous dipoles that induce corresponding dipoles in neighboring atoms, resulting in a net attractive force. The interaction potential energy [latex]V[/latex] between two atoms at distance [latex]r[/latex] is approximately [latex]V = -\frac{C_6}{r^6}[/latex].

Colorimeter measuring light sources in a laboratory for colorimetry applications.

普朗克轨迹

普朗克轨迹是白炽灯黑体辐射器的颜色随其温度变化在色度空间中的变化路径。它通常绘制在CIE 1931 xy色度图上，呈现为一条从红橙色区域到蓝白色区域的圆弧。它是定义色温的基本参考。

紫外线光谱细分（UVA、UVB、UVC）

Superconductor in laboratory demonstrating Meissner effect in solid state physics.

迈斯纳效应

Discovered in 1933 by Walther Meissner and Robert Ochsenfeld, the Meissner effect is the expulsion of a magnetic field from a superconductor during its transition to the superconducting state. When a material is cooled below its critical temperature ([latex]T_c[/latex]) in the presence of a weak external magnetic field, it actively cancels all magnetic flux inside it, becoming a perfect diamagnet.

Laboratory experiment demonstrating Hamaker Theory in physical chemistry of surfaces.

哈梅克理论（物理学）

A theory that extends the microscopic Van der Waals forces between individual atoms to the macroscopic scale, calculating the total interaction force between bulk objects (e.g., two spheres, a sphere and a plate). It assumes pairwise additivity, integrating the microscopic [latex]r^{-6}[/latex] potential over the volumes of the interacting bodies. The result is quantified by the Hamaker constant, [latex]A[/latex].

P-N junction in a solar cell demonstrating semiconductor physics.

PN结光伏原理

太阳能电池的核心是pn结，即p型和n型半导体材料之间的界面。该结在耗尽区产生内置电场。当具有足够能量的光子撞击半导体时，它们会形成电子-空穴对。电场将这些载流子分离，驱动电子向n侧移动，空穴向p侧移动，从而产生电压。

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Laboratory experiment measuring electrochemical potential in physical chemistry.

电化学势基本方程

Electrochemical potential, [latex]\bar{\mu}_i[/latex], quantifies the total energy of a charged species `i` in a system. It combines the chemical potential, [latex]\mu_i[/latex], which accounts for concentration and intrinsic properties, with the electrostatic potential energy, [latex]z_i F \phi[/latex]. The formula is [latex]\bar{\mu}_i = \mu_i + z_i F \phi[/latex], where [latex]z_i[/latex] is the ion's charge, [latex]F[/latex] is the Faraday constant, and [latex]phi[/latex] is the local electric potential.

Laboratory scene demonstrating thermoelectricity applications with Peltier cooler and generator.

Onsager 互惠关系

A key theorem in non-equilibrium thermodynamics, these relations express the equality of certain cross-coefficients between coupled flows of energy and matter. They state that in the absence of a magnetic field, the matrix of transport coefficients is symmetric: [latex]L_{\alpha\beta} = L_{\beta\alpha}[/latex]. This links seemingly unrelated transport phenomena, such as the Seebeck and Peltier effects in thermoelectricity.

Laboratory technician measuring Correlated Color Temperature of LED light sources with a spectrometer.

相关色温（CCT）

相关色温 (CCT) 是衡量非理想黑体辐射光源（例如 LED 或荧光灯）色温的指标。它是指与光源颜色感知最接近的普朗克辐射体的温度。这种“接近度”是通过在普朗克轨迹上找到距离光源色度坐标最近的点来确定的。

Perfect Reflecting Diffuser in a laboratory for colorimetry and spectrophotometry calibration.

完美反射扩散器（PRD）

完美反射漫射体，也称为完美白光，是一种理论上的理想表面，在比色法和分光光度法中用作参考标准。其定义为能够 100% 反射可见光谱中所有波长的入射光，并实现完美漫反射（朗伯反射）的表面，这意味着其亮度在任何视角下都均匀一致。

Chemist measuring superacid solutions in an organic chemistry laboratory.

超强酸和哈米特酸度函数

A superacid is an acid with an acidity greater than that of 100% pure sulfuric acid. The conventional pH scale is inadequate for these media. Instead, their acidity is measured using the Hammett acidity function, [latex]H_0[/latex]. This function is based on the protonation of weak indicator bases and is defined as [latex]H_0 = pK_{BH^+} - \log\left(\frac{[BH^+]}{[B]}}\right)[/latex].

Industrial facility for hydrogen peroxide production using the anthraquinone process.

蒽醌法生产H₂O₂

蒽醌法工艺开发于20世纪30年代，是生产过氧化氢的主要工业方法。该工艺首先将蒽醌衍生物加氢生成蒽氢醌，然后用空气氧化蒽醌，再生出原始蒽醌并生成过氧化氢。之后，用水提取过氧化氢并浓缩，形成一个连续高效的循环。

Chemist balancing redox equations in a laboratory, showcasing oxidation state in inorganic chemistry.

氧化态概念（氧化数）

氧化态，或称氧化数，是指假设一个原子与不同原子的所有键均为100%离子键时，该原子所带的电荷。它提供了一种追踪氧化还原反应中电子转移的方法。氧化态升高表示氧化，氧化态降低表示还原。这种形式简化了复杂化学反应的分析。

Laboratory scene with chemist measuring thermate composition for incendiary applications.

铝热剂组合物

Thermate is an incendiary composition that enhances standard thermite. It is typically a mixture of thermite, barium nitrate ([latex]Ba(NO_3)_2[/latex]), and sulfur. The barium nitrate acts as an oxidizer, increasing the thermal output and making the reaction less dependent on atmospheric oxygen. Sulfur is added primarily to lower the ignition temperature, making the mixture easier and more reliably ignited.

（如果日期未知或不相关，例如“流体力学”，则提供其显著出现的近似估计）