Ultraviolet ray used in medicine and the phototherapy instrument it to adopt UVB technology . the wavelength of phototherapy instrument is 311nm. the 311nm ultraviolet ray has obvious effect for Vitiligo and psoriasis. it is physical treatments of the skin disease. the uv led strip can emits ultraviolet ray as medium wavelength as 311nm .the 311nm can be absorbed by skip tissues. it has obvious biology effect for skip tissues. and it can directly kill the bacterium or the virus in superficial tissue. it keeps the circulation moving and warms the extremities .
The angle of lens is decision illuminate direction, we can calculate illuminate area with tangent function.
Trigonometric Function Of Acute Angle
tan10°=0.176（can calculate that lens value as 20°）
tan12.5°=0.222（can calculate that lens value as 25°）
tan15°=2-√3
tan22.5°=√2-1
tan30°=√3/3
tan45°=1
tan60°=√3
Different angle , different aperture and illuminate value
30°
1meter aperture φ0.56M illuminate area as 0.246 square metres
2meter aperture φ1.12M illuminate area as 0.985 square metres
3meter aperture φ1.68M illuminate area as 2.217 square metres
45°
1meter aperture φ0.828M illuminate area as 0.538 square metres
2meter aperture φ1.656M illuminate area as 2.154 square metres
3meter aperture φ2.484M illuminate area as 4.864 square metres
60°
1meter aperture φ1.15M illuminate area as 1.046 square metres
2meter aperture φ2.3M illuminate area as 4.189 square metres
3meter aperture φ3.46M illuminate area as 9.424 square metres
120°
1meter aperture φ3.464M illuminate area as 9.424 square metres
2meter aperture φ6.928M M illuminate area as 37.697square metres
3meter aperture φ10.392M illuminate area as 84.818 square metres
Are ultraviolet therapy instrument potentially harmful to skin?
The ultraviolet therapy instrument can emits ultraviolet ray as 311nm(because uv led strip inside). the ultraviolet ray ability to be absorbed by epidermal tissue. so the 311nm of ultraviolet has obvious biological effect for skin and other tissues. so far, a number of investigations have been launched in over the years,for example: include that detecting the light-absorbing effect of skin pigmented diseases. all result proved ultraviolet therapy instrument are relatively safe. the skin cancer have not been caused directly by ultraviolet therapy instrument.
The effect of plant growth with different led source
Some scholars have found that the different led source changes will affect the physical and chemical properties of plant . they gives examples like that the single led or combination led(Multi-chip Array Combination LED) will production of photosynthesis for Chrysanthemum lily, Phalaenopsis, holly, leaves with lettuce . The red light and R+ B light were the most effective for the accumulation of the soluble sugar and titratable acid. 4. Different light emitting diode sources had different effects on tomato fruit flavor quality.
Yellow LED increased the plant height and leaf pigment content at initial growth stage. Overall, red-blue LED was more beneficial to the culture of strong plant seedlings.
The semiconductor laser is bag power laser and it wavelength is 808nm。it has great many characteristics that high power, conversion ratio of Photoelectricity is high, strongly reliability, long server time, low cost .
To understand incentive mode is best way that learning the theory of semiconductor laser。the two parallel plane mirrors formed from the cleavage facets of semiconductor, use the parallel plane mirrors as reflector. and use the mechanism of direct interband transition of semiconductor ,they formed resonant cavity . These conditions do obtain after resonant cavity is set up. then optical oscillation and feedback.
Finally they produces light radiation amplification and output laser.
LED in the development agriculture played an import role. fluorescent tube and high pressure sodium lamp is main artificial light source in agriculture during the past decades, How to improved efficiency(improved evenness of light source, adjust light Qualities) ? , which is the focus of current academic circles problems research. because the results showed that the light quality had a remarkable effect on the net photosynthesis of plant growth.
In recent year , the progress of photo electricity technology continuously improved that bright and light effect of light emitting diode (LED), every one most assuredly does believe in LED for development agriculture .LED has some advantage that high conversion efficiency of photo electricity , DC drive, small volume, long server time, customer wavelength and low heat . the fluorescent tube and high pressure sodium lamp is relatively backward and old compare with LED ,basically is behaved in light bright and light quality(light wavelength of proportional control can’t be achieved).
So the led is best light source fit for the development agriculture.
Electromagnetic radiation is optical light, because light was an essentially electromagnetic radiation . the electromagnetic radiation is divide into two parts base on wavelength: visible light and invisible light. we have hear that invisible light has infrared light, uv led strip and microwave.
The 0.4～0.76μm of wavelength is better suit to animal and human .so we are call0.4～0.76μm of wavelength as visible light(short for light).more that 0.76μm call infrared light , less that 0.4μm call uv light .
the organ that can received electromagnetic radiation, we call him eyes. and the process of received electromagnetic radiation call ”seeing ”.
Human ‘ eyes seem to light of plant lamp was color temperature and lumen . the plant doesn’t take one look at color temperature and lumen during photosynthesis. the spectrum is import condition for plant growth .
the table is show spectrum that effect of plant growth280 ~ 315nm——>for process of plant form and plant physiology with minimal effect
315 ~ 400nm——>can be absorbed little by Chlorophyll, it has been try to prevent that stem elongation,
400 ~ 520nm(blue)——>the ratio of absorbing chl a and carotenoids is highest , so the plant physiology with highest effect in this range.520 ~ 610nm(green)——> the ratio of absorbing pigments is low , 610 ~ 720nm(red) ——> the ratio of Chlorophyll is low , but these wavelength had effect for photosynthesis .
720 ~ 1000nm——> the ratio of absorbing is low, it is most exciting growth of plant cell , and effect of seed varieties germinate
＞1000nm——>is converted into heat.
We devote data table below to analysis that wavelength effect. different wavelength has different effect of photosynthesis for plant growth . we know that the from of photosynthesis needs light. the 400 ~ 720nm 400 ~ 520nm(blue) 610 ~ 720nm (red)wavelength is most of contribute for photosynthesis. the 520 ~ 610nm has low ratio of plant pigment absorbing .
Relative effect of led wavelength
Human ‘ eyes seem to light of plant lamp was color temperature and lumen . the plant doesn’t take one look at color temperature and lumen during photosynthesis. the spectrum is import condition for plant growth .
the table is show spectrum that effect of plant growth:
280 ~ 315nm——>for process of plant form and plant physiology with minimal effect
315 ~ 400nm——>can be absorbed little by Chlorophyll, it has been try to prevent that stem elongation,
400 ~ 520nm(blue)——>the ratio of absorbing chl a and carotenoids is highest , so the plant physiology with highest effect in this range.520 ~ 610nm(green)——> the ratio of absorbing pigments is low , 610 ~ 720nm(red) ——> the ratio of Chlorophyll is low , but these wavelength had effect for photosynthesis .
720 ~ 1000nm——> the ratio of absorbing is low, it is most exciting growth of plant cell , and effect of seed varieties germinate
＞1000nm——>is converted into heat.
