Flexible Adaption of the System to Types of Cells and Faults Being Tested

The construction of large-area photoelectric solar power plants requires the application of high-performance solar cells and modules of excellent quality. InfraTec's thermographic testing system PV-LIT allows testing of solar cells for various types of defects even in the manufacturing process. It is also possible to carry out a continuous quality control for serial productions in order to sort defective cells out at an early stage and, following, avoiding additional costs. According to the to-be-tested types of defects, PV-LIT provides the use of contact testing (DLIT) as well as non-contact testing (ILIT).

Accurate Representation of Defects with the Help of Lock-In Thermography

High-performance infrared camera systems with highest thermal resolution of a few hundredths degrees (°C) applied in the PV-LIT system ensure an accurate detection of defects. This is ensued in a precise cooperation of the excitation and evaluation unit. Thus, lock-in thermography can be used by performing a pulsed excitation of solar cells, for instance through LEDs and a triggered image acquisition. By means of this method, defects - even those being below surface - will be detected and clearly displayed as local heating (shunts). Even after thorough infrared quality testing cells as well as modules in running operation can be checked using thermograhy. Make use of the potential that photovoltaic inspection offers!