Inspection solutions for solar glass

Best line yield due to advanced defect classification
Process optimization by early intervention
Low operating costs and increased profitability
High level of customer satisfaction
Optimize maintenance

Inspection solutions for solar glass

Precision inspection for flawless solar glass

The production of solar glass presents several challenges that can lead to defects in the final product. While defects are common in glass manufacturing, their detection and differentiation in solar glass, production is particularly challenging. Even tiny defects must be detected and distinguished with high reliability.

Most vision systems are limited in their ability to achieve this level of precision. It is therefore critical for manufacturers to implement efficient quality inspection processes to ensure high-quality solar glass products. Otherwise, significant risks can arise, such as lower solar module efficiency and reliability, reduced customer satisfaction and ultimately financial losses.

ISRA VISION's inspection systems ensure quality throughout the entire solar glass production process, from cooling the glass ribbon to cutting the finished glass plate. The optical inspection systems are characterized by reliable detection, classification and differentiation of even the smallest defects. In this way, the systems ensure the highest quality of solar glass in accordance with the specified market standards.

Glass ribbon inspection

To inspect the patterned glass ribbon, our optical inspection system can be located directly after the furnace and cooling zones. The fully automated system is specially designed to provide precise inspection results even in hot and dirty production environments without the need for additional protective measures.

As a result, the system ensures fast and reliable assessment of material quality on the patterned glass ribbon. In addition, it provides precise defect classification, enabling it to accurately distinguish between open and closed bubbles.

Benefits

Precise inspection results even in hot and dirty production environments
Fast installation and commissioning
Seamless integration into existing process lines

Distinction between open bubbles/closed bubbles, stones/bubbles
Shortest ramp-up times

Features
Typical defects
Technical data

Advanced, learning defect classification
Defect cluster analysis
Suitable for connection with cut optimizing system
Robust and resistant to heat and contamination
Cross Dark Field-Technology

Open bubbles, closed bubbles, elongated bubbles
Stones
Scratches
Inclusions
Knots, threads

Non-clean room inspection down to 90 μm
2000-4700 mm inspection width
Only one camera bank with switchable LEDs

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Glass plate inspection

Several defects can occur in the manufacturing of solar glass plates that affect their performance and durability. One common problem is the glass edges, which can be chipped or unevenly cut, causing the glass plate to crack during installation. Another problem involves the solar cover glass, which can have scratches, contaminants or bubbles that reduce the panel's transparency and efficiency.

Defects can also occur in the substrates used for the solar glass, which can reduce the efficiency of the solar glass panel. Finally, parabolic mirrors used in concentrated solar power systems can also have defects. This can lead to reduced reflection and energy capture, which lowers the overall efficiency of the system.

ISRA VISION's inline surface inspection systems precisely inspect the entire surface and edges even at high production speeds to prevent further processing of defective solar glass plates.

Flawless edges of solar glass

After grinding, our automatic edge inspection system inspects the glass edges for all typical edge and grinding defects. It is the only system on the market to detect asymmetries in the grind at an early stage. Its high-precision edge inspection sensors can be flexibly integrated into the production line. Each sensor scans an edge with several high-resolution cameras and special illumination systems that enable an all-round view of the edge. The system then analyzes the generated images in real-time, detecting and classifying all edge defects, thus enabling automatic quality classification of the glass plates. The collected data can be used to determine the ideal replacement time for the grinding wheel and the edge cutter.

Defect-free solar cover glass

Directly after the washing zone, a patterned sheet glass inspection solution is installed to ensure defect-free solar cover glass. Thanks to ultra-fast pattern switching and multimode LED illumination, a theoretically unlimited number of differently illuminated views can be generated with just one camera or a series of cameras. The information from the different views is used to achieve reliable and advanced defect classification. The result: defects that were previously classified as invisible and indistinguishable become visible.

Monitoring of substrates (glass panels)

On entry into the thin-film solar module production process, a camera-based inline inspection system monitors the substrates (glass panels). On the fly, high-resolution line scan cameras reliably detect all defects on the glass panels at high processing speeds. This enables the user to identify and remove defective glass panels early on.

Perfect planarity and curvature of parabolic mirrors

Finally, a fully automated 3D inline inspection system, specially developed for the demanding requirements of parabolic mirror production, precisely measures the planarity and curvature of a complete mirror in just 10 seconds. Deviation of the mirror angle from the setpoint (focus deviation) is measured using deflectometry. Glass that does not meet the required quality specifications is automatically sorted out and is not conveyed to downstream processes. In addition, the system automatically saves measurement data for statistical evaluations and thus helps to optimize processes.