Glass transmittance measurement applications for photovoltaic panels – Gossen lux meter M**Omaster
Photovoltaic panel glass
There are a series of silicon crystalline cells in the solar PV panels, inserted between the top glass panel and the plastic backplate, and held in place by an aluminum frame. The glass plate on top protects the silicon crystal cell from weather and hail or airborne debris. To increase efficiency and improve light transmission, many manufacturers use high-transmission glass with a low iron content and an anti-reflective coating on the back. The glass is usually high-strength tempered glass with a thickness of 30 to 40mm, designed to resist mechanical loads and extreme temperature changes. Tempered glass is also much safer than standard glass in the event of an accident or severe impact, as it shatters into tiny pieces rather than sharp jagged shards of glass.
The International Electrotechnical Commission (IEC) minimum standard impact test requires that the panel be able to withstand a 1-inch (25 mm) diameter hail at a speed of 60 mph. The glass should be highly transparent to make the most of the light received by the solar cells. Light passing through the glass is transmitted, absorbed, or reflected. The thicker the glass, the more resistant it is to the weather. However, this tends to make transparency less. The German GMC-I Group GOSSEN brand lux meter can calculate the transmittance of the glass by measuring the front and rear illuminance values of the photovoltaic panel glass, and try to improve the transmittance of the glass so that more sunlight can be received by the cell.
Anti-reflective coating
Typically, an anti-reflective coating is applied to the glass. The coating helps to reduce the amount of light reflected by the glass and increase the amount of light that penetrates the glass, resulting in solar PV panels with a high conversion rate. The application of coating technology can reduce light reflectivity while maintaining high transparency of the glass. In general, light passing through glass at a small angle is more reflective than light passing through glass at a large angle. During the day, the angle of incidence of sunlight at sunrise and twilight is smaller. Therefore, in order to optimize the conversion rate, it is necessary to reduce the reflection of sunlight at low angles of incidence. The lux meter of the Gossen brand of the German GMC-i group can meet the needs of measuring the light reflectivity of the glass before and after the anti-reflective coating is applied, and help customers evaluate the coating performance.
Product Specifications:
Great precisionPrecision illuminance measuring instrument in Lx or FC, according to the accuracy of DIN5032-7 class C, as well as IEC 13032-1 Annex B and CIE 69, measured against the degree.
Measuring rangeThe M**OLUX 5032 B USB small measurement is 001 lx or 0001 Fc, large measurements to 199,900 lx or 19,990 Fc.
v( ) matchThe spectral sensitivity of the silicon photodiode of the device sensor is color-corrected to match the sensitivity v( ) of the human eye.
Cosine correctionCosine correction is performed for incident light at certain angles, which is mainly used as an evaluation parameter for the sensor.
Brightness testLuminance can be measured with the brightness accessory in cd m or fl (the brightness accessory is optional) and the adapter plate prevents the influence of side light on the measurement results.
Easy to operateIt is easy to operate, easy to read the displayed data, and has a sturdy protective case.
Data storageUp to 100 values can be stored and data can be transferred to a PC via a USB interface.
Ancillary softwareWith the Glux 2 software, test data can be read, displayed, and stored, and the device can be powered via USB.
Gossen lux meter M**Omaster