dust sensor

Abstract

The invention discloses a dust sensor, comprising: a light-emitting unit for emitting monochromatic light to irradiate the dust area of ​​a solar cell panel; for receiving light reflected by the dust area of ​​the solar cell panel, and the resistance value varies with the intensity of the received light A photoresistor with a weak corresponding change; the photoresistor is connected in series with the photoresistor in the power supply circuit, and a current detector for detecting the current change of the power supply circuit; connected with the current detector, used for detecting the current according to the current size of the current detector I i , combined with the maximum current value I that the current detector can measure s , according to the formula I p = I s -I i Obtain the dust thickness nominal value I covered in the dust area of ​​the solar panel p The processing unit; And connect processing unit, be used for the dust thickness nominal value I that described processing unit obtains p A display unit for display; the present invention realizes the convenient and effective detection of the dust thickness covered on the surface of the solar battery panel, and is convenient for reminding relevant personnel to perform corresponding cleaning work of the solar battery panel.

Description

technical field [0001] The invention relates to a dust detection device, in particular to a dust sensor. Background technique [0002] A solar panel is a device that directly or indirectly converts solar radiation into electrical energy by absorbing sunlight and through the photoelectric effect or photochemical effect. Although solar panels have a great market demand in just a few years, the energy conversion rate of solar cells is low. It has always been an important factor affecting its use and promotion. In addition to the problems of materials such as monocrystalline silicon and polycrystalline silicon, which are the reason for low energy conversion, another factor that causes low energy conversion is that solar panels are covered by dust. At present, there are many Relevant application examples, when "Opportunity" first started its Mars exploration mission in February 2004, the 1.3-meter-long solar panels on it could provide 900 watt-hours of electricity per day, but by...

AI Technical Summary

Problems solved by technology

[0002] A solar panel is a device that directly or indirectly converts solar radiation into electrical energy by absorbing sunlight and through the photoelectric effect or photochemical effect. Although solar panels have a great market demand in just a few years, the energy conversion rate of solar cells is low. It has always been an important factor affecting its use and promotion. In addition to the problems of materials such as monocrystalline silicon and polycrystalline silicon, which are the reason for low energy conversion, another factor that causes low energy conversion is that solar panels are covered by dust. At present, there are many Relevant application examples, when "Opportunity" first started its Mars exploration mission in February 2004, the 1.3-meter-long solar panels on it could provide 900 watt-hours of electricity per day, but by June 2013, with the "Opportunity" The solar panels of the rover were slowly stained with Martian dust, and the power provided by the solar panels dropped to 500-600 watt-hours per day, so that NASA scientists had to order the two Mars rovers to park on the south-facing slope as much as possible. , so that they can receive more sunlight, even though the daily power provided by the Mars rover still cannot be increased

Due to the existence of this problem, many solar power generation equipment urgently need to be cleaned after a certain number of years of use, because with the accumulation of time, dust and sand will fall on the solar panels and linger, which not only seriously affects the power generation efficiency, but also the dust on the surface It also has a great influence on the characteristic parameters such as open circuit voltage, short circuit current and output power of the solar cell module. The experimental results show that the short circuit current will decrease rapidly with the increase of dust mass, while the open circuit voltage decreases relatively slowly. The resulting loss of power generation can reach 9%

At the same time, the amount of sand and dust per unit area on the surface of the solar panel and the scale of the dust also have a great impact on the wavelength of light irradiated on the surface of the solar panel; in addition, during the use of the solar panel, if there is a solar panel If the battery alone is blocked by leaves, bird droppings, etc., the solar cell that is blocked alone will heat up and be damaged under strong sunlight, which will lead to damage to the entire solar cell module. This is the so-called heat island effect, which will cause inestimable damage to the solar cell panel. damage

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