Fuzzy PCA based Image Matching and Flexible Flying Probe are Used in Embedded Based PCB Bare Board Testing Machine

In the conventional approach for test jig is equipped by mounting an insulation material pattern above the flexible conductive screen. This is done by maintaining small distance away from the PCB of same pattern in order to detect particular defect location. It is then done by scanning the pattern with help of the roller which forces these two patterns into making contact by passing current from the screen side to side in the wiring board at scan. Prerequisites are prepared to examine involuntarily X and Y coordinated positions of a fault spot into a register. But it has several disadvantages like incompatibility for different size boards, and multilayered testing is not possible, as testing procedure takes a lot of time. To overcome the above said problems the objective of this work is to design and develop an embedded based PCB bare board testing machine by using the flexible flying probe. It acts as a major replacement for the manual testing process conducted by the jig method. This machine is able to inspect multi-layered boards within a short period of time. The second work is the extension of the previous work. It performs the image comparison process using the fuzzy PCA algorithm which determines the presence of error in the testing of the PCB bare board image with already stored error free template image of PCB and it produces matching accuracy in percentage. If the result is 100% then the testing bare board is defect free, otherwise it is identified as a defected PCB.