This part of IEC 62496 specifies the test method to decide whether to pass or fail an optical circuit board using direct illumination by a light. The input ports are directly illuminated and the optical intensity from the output ports of the optical circuit board is monitored using an area image sensor. Excess optical losses are the calculated from total detected intensities of light from a sample to be measured and from a control sample. This method is used to illuminate uniformly the input port of the optical circuit board (OCB) with a larger area than the core area, obtain the radiance of an area image from the corresponding output port of the OCB using an area image sensor, and evaluate whether to pass or fail using the radiance obtained compared to that of a control sample.<\/p>\n
The advantage of this test method is that the alignment procedure between a launch fibre and the OCB is not necessary.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | Foreword Endorsement notice <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | Annex ZA (normative) Normative references to international publications with their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 Scope 2 Normative references 3 Terms, definitions and abbreviations 3.1 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3.2 Abbreviations 4 Measurement conditions <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 5 Inspection methods 5.1 Equipment Figures Figure 1 \u2013 Optical transmission test system without I\/O fibres for surface I\/O type OCB Tables <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 5.1.1 Light source system Figure 2 \u2013 Optical transmission test system without I\/O fibres for end-face I\/O type OCB <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 5.1.2 Observation system Figure 3 \u2013 Schematic diagram of measurement of uniformity of illumination area Figure 4 \u2013 Example of obtained uniformity of illumination area <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 5.1.3 Data processing unit Figure 5 \u2013 Example of obtained sensitivity of an image sensor (input uniformity within 1 %) <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5.1.4 Unit for holding the sample 5.2 Measurement procedures of relative optical loss 5.2.1 Preparation of light source <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.2.2 Preparation of the optical observation system measuring equipment 5.2.3 Measuring coordinates of I\/O ports 5.2.4 Capturing of optical images for control sample and samples to be measured Figure 6 \u2013 Position alignment of light source <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.2.5 Image data processing (detection of I\/O port range) 5.2.6 Calculation of relative loss Figure 7 \u2013 Example of captured image and extracted I\/O port rangeby image binarization <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.3 Evaluation of pass or fail Figure 8 \u2013 Calculation of the total detected intensity of extracted I\/O port rangefrom detected intensity for each pixel <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Annex A (informative) Example of an optical transmission test for an OCB without I\/O fibres Table A.1 \u2013 Observation system Table A.2 \u2013 Light source Table A.3 \u2013 Samples to be measured <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Figure A.1 \u2013 Example of relative optical loss measurement <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Figure A.2 \u2013 Example of reproducibility of relative optical loss measurement <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Annex B (informative) Measurement of input and output ports in offset positions Figure B.1 \u2013 Ray traces for OCBs with mirror having designatedmirror angle (left) and not designated one (right) <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Figure B.2 \u2013 Difference of focus positions between without offset and with offset Figure B.3 \u2013 Optical images at surface of OCB plane (without offset) and offset position (with offset) <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Optical circuit boards. Basic test and measurement procedures – Optical transmission test for optical circuit boards without input\/output fibres<\/b><\/p>\n |