European Journal of Scientific Research - EuroJournals

More documents

Recommendations

Info

Research of the Characteristics of a Solar Panel Radiated with Со2 Laser, as Means for Injection on Fading Satellites 424 Figure 6: Volt-ampere characteristics for СО2 laser at various power and diameter of 25 cm. I,microA 1600 1400 1200 1000 800 600 400 W=0.5 W=2.2 W=50 W=100 W=250 W=500 33.0 33.5 34.0 34.5 35.0 Analysis of the results The following quantities can be brought into use, that characterize the panel’s quality to transform the laser light into electric one, depending on the diameter of the laser spot and the power of the laser emission. These are the ratio between the floating voltage and the laser’s power U0/Pl, and the current I0/Pl, that results from the short circuit. During laser radiation at 0.5 W the floating voltage for a 25 cm spot is 3.6 times greater than the one for a 5 cm diameter spot. The values for the short circuit current for a spot of 25 cm are approximately 7 times bigger. As the laser power increases there is no significant increase of the floating voltage and the short circuit current – 36 V and 7 mA for 25 cm and 12 V and 1 mA for 5 cm at 0.5 up to 500 W power. The values of the electric power of the solar panel at 0.5 W radiation are more than 38 times bigger at 25 cm diameter of the laser spot than these at 5 cm, for resistance R = 33kΩ (Table 1). The difference between the electric power at 5 and 25 cm increases with the increase of the resistance and at R= 503 kΩ the electric power is 85 times bigger. This ratio (Р5cm- Р25cm), is preserved more or less unchanged at every value of the laser’s power (Table 2,3,4,5.). The efficiency, which is the most important characteristic of the researched system, varies from 8,98 % for 25 cm diameter of the spot to 0,2 % for 5 cm diameter of the spot at R = 33kΩ. The efficiency gradually decreases with the increase of the resistance reaching 3,02 % for 25 cm and 0,03 % for 5 cm (Table 1). With the gradual increase of the laser’s power from 0,5 W to 500 W the electrical power of the photo converter increases as well with approximately 3 mW, but thus reducing the efficiency. The lowest efficiency values of the photo converter are achieved at the highest level of the laser emission’s power (Table 5, Fig. 4). The volt-ampere characteristic of the photo element, at 5cm laser spot diameter (Fig. 5) shows relative nonlinearity. Certain saturation is indicated at the higher voltage values. For 25 cm laser spot the volt-ampere characteristic is S-shaped, and the saturation is measured again at the lower current and the higher voltage values. Nonlinearity probably results from the raised temperature of the selective coverage, which causes emission of heat, thus increasing the resistance causing the current to stop decreasing linearly, but keep same values (Fig. 6). Conclusions The analysis of the results shows that the usage of a wavelength, close to the theoretically deduced one, increases the photo element efficiency. In the same time the results suggest that for producing high efficiency higher power is not necessary. U,V
425 M. Zamfirov References [1] Landis, G. (1991) Space Power by Laser Illumination of Photovoltaic Arrays Space Photovoltaic Research and Technology, NASA CP-3121, 24-5, May [2] Backus C. (1972) Laser Activation of Solar Cells Proceedings of the 9th IEEE Photovoltaic Specialists Conference, Silver Spring, May [3] Friedman, H., et al. (1994) Scaling of Solid-state Lasers for Satellite Power Beaming Applications SPIE Optics, Electro-optics & Laser Conference, Los Angeles CA, Jan. 24-28; [4] Lowe, R., G. Landis and P. Jenkins (1995) Response of Solar Cells to Pulsed Laser Illumination IEEE Transactions on Electron Devices, Vol. 42, No. 4 [5] Rahilly, W. (1975) Electron Damage in High Efficiency Solar Cells High Efficiency Silicon Solar Cell Review NASA Technical Memorandum TM X-3326 [6] Peter, U. and R. Morgan (1991) SDIO Ground-based Laser Support Laser and Power Technology, Volume VIB [7] Zamfirov, М. (2003) Problems and concepts of the development of Solar Power Satellite Aerospace research in Bulgaria, vol.17,
Page 1 and 2:
European Journal of Scientific Rese
Page 3 and 4:
appropriate. Manuscripts may be rej
Page 5:
A Comparative Analysis of Gibberell
Page 8 and 9:
Nutritive Evaluation of Some Trees
Page 10 and 11:
Page 12 and 13:
Page 14 and 15:
Page 16 and 17:
Determination of Sample Size 320 mi
Page 18 and 19:
Determination of Sample Size 322 sa
Page 20 and 21:
Determination of Sample Size 324 [2
Page 22 and 23:
Page 24 and 25:
328 Amin Yazdanpanah Goharrizi and
Page 26 and 27:
Page 28 and 29:
Page 30 and 31:
Investigation of Complex Formation
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Germination Studies in Selected Nat
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
Page 44 and 45:
348 Moronkola, O.A and Aladesanyi,
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Page 52 and 53:
356 Maryam Nooritajer, Faezeh Nouro
Page 54 and 55:
358 Maryam Nooritajer, Faezeh Nouro
Page 56 and 57:
Aetiology and Epidemiology of Sever
Page 58 and 59:
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71: 374 Nazenin Ruso cultures for Turki
Page 72 and 73: 376 Nazenin Ruso b) Literate/ Illit
Page 74 and 75: 378 Nazenin Ruso thinking of God”
Page 76 and 77: 380 Nazenin Ruso Our mosques capaci
Page 78 and 79: 382 Nazenin Ruso The last pie chart
Page 80 and 81: 384 Nazenin Ruso will be free to do
Page 82 and 83: 386 Nazenin Ruso note at this point
Page 84 and 85: European Journal of Scientific Rese
Page 86 and 87: 390 Amani Michel Kouassi, Koffi Fer
Page 98 and 99: Seedling Growth of Gmelina Arborea
Page 104 and 105: A Comparative Analysis of Gibberell
Page 114 and 115: Research of the Characteristics of
Page 124 and 125: 428 Nooritawati Md Tahir, Aini Huss
Page 132 and 133: 436 Rahman G.A, Alabi.B.S, Afolabi.
Page 134 and 135: 438 Rahman G.A, Alabi.B.S, Afolabi.
Page 136 and 137: Health Impact Assessement of Multin
Page 144 and 145: Development of Organic Carbon Seque
show all

European Journal of Scientific Research - EuroJournals

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?