At the beginning of the new year, people often make up their minds to start the yearweight loss planSo he urgently began to purchase sports equipment and clothing. There are many different specifications on the marketsportswearCommon performance features include sweat wicking and quick drying function, breathability, andUV protection capabilityThe anti UV ability is based onSPF (Sun Protection Factor)Classify the UV protection ability of clothing, which indicates how many times the effectiveness of this covering in protecting human skin from sunburn has been improved.

For example, if the human skin starts to burn after 10 minutes, the sun protection factor isSPF30The product can protect the skin from sunburn300 minutesNowadays, many UV resistant clothing on the market have an SPF50 or higher, which provides strong UV protection. In addition to the advancement of anti UV coating technology,Clothing materialsThe choice of materials is also crucial for UV protection, for example, polyester and nylon have stronger UV resistance compared to cotton.

The purpose of this experiment is to determineUV resistant clothingandordinary clothesThe ability to resist ultraviolet radiation.

In the experiment, we willCoated with anti UV coatingThe clothing (100% polyester anti UV clothing) is exposed to ultraviolet light, and the other side of the fabric is measured. The obtained spectrum is then compared with independent ultraviolet light to quantify the anti UV ability of the clothing. In addition, we also measured two pieces of clothing using the same method: one made of material50% cotton+50% polyesterThe other material is100% polyester.

This experiment usedNew MinispectrometerAvaSpec-NEXOS™The wavelength range configured for this spectrometer is200-450 nm.

The light source used isAvaLight-XE-HP, a type of high-powerPulsed xenon lampLight source.

Other materials used in the experimentattachmentIncluding: Integral Sphere AvaSphere-50; A 0.5m long optical fiber with a core diameter of 600 μ m is used to connect an integrating sphere and a spectrometer.

Experimental MethodThe clothing samples in the experiment were purchased from local shopping malls and have not undergone any preparation or cleaning treatment. We will use the software in AvaSoftTransmittance transmittance modeDirectly irradiate the measuring hole of the integrating sphere with a xenon lamp light source without placing the sample as a reference. usedThe integration time is 4 seconds，The average number of times is 1.

analytical methodCommon UV rays in daily lifeUVBTheUVATwo types. The wavelength range of UVB band is280-320nmIt is an outdoor ultraviolet band,People directly ejaculate into their skin while engaging in outdoor activities. The wavelength range of UVA is320-400nm，It is one of the factors that cause skin sagging and aging, which is medically referred to asPhoto induced agingWe will analyze the UV resistance of the three samples based on UVB, UVA, and residual wavelength regions.

Figure 4: The overall UV transmittance of clothing made of 50% cotton and 50% polyester is higher, with a transmittance of approximately in the UVB region (280-320nm)4%， The transmittance in the UVA region (320-400nm) is6%Transmittance of the remaining band region (400-450nm)approximately7%-15%.

Figure 5: Although no UV protection coating was added, 100% polyester clothing still provides protectionstrongerUV protection, although only a part of the UV range. The transmittance of the UVB region (280-320nm) is approximately1%， The transmittance in the UVA region (320-400nm) is2-9%The transmittance of the remaining band region (400-450nm) is9-12%.

Figure 6: Comparing three samples, it is evident that the UV transmittance of the anti UV clothing is highlowInterestingly, inFront end of UVB region (280-320nm) and UVA region (320-400nm)Ordinary 100% polyester clothing and anti UV 100% polyester clothing with anti UV effectalmost the sameThis result indicates that in addition to the additional anti UV coating on clothing, itMaterial selectionIt is also very important. Among them, 50% cotton+50% polyester clothing has UV resistance in all areaspppof

Of course, this is still much stronger than not wearing clothes.

This experiment usedSpectral analysis methodBy comparing the UV transmittance of three samples: 50% cotton+50% polyester clothing, 100% polyester clothing, and 100% polyester UV resistant clothing at 200-450nm, the UV resistance of the UV resistant clothing was confirmed.

In summary, when choosing UV resistant clothing, in addition to indicating that the clothing has a UV resistant coating, the clothing'sMaterial selectionIt is also very important.