PHYSICAL PITCH VARIATION MEASURING METHOD OF CORRUGATED HIGH FREQUENCY CABLE AND ITS MEASURING DEVICE, CHARACTERISTIC EVALUATING METHOD OF CORRUGATED HIGH FREQUENCY CABLE AND ITS EVALUATING DEVICE AND CORRUGATED HIGH FREQUENCY CABLE MANUFACTURED BY THIS CHARACTERISTIC EVALUATING METHOD

摘要

PURPOSE: To easily and accurately measure periodic variation of a waveform of a corrugated high frequency cable whose outer peripheral part is formed in a waveform in the axial direction by finding a physical pitch variation on the basis of a measured result of respective pitches of the waveform of the corrugated high frequency cable by an optical sensor. ;CONSTITUTION: A signal generated from a light receiving part when an optical laser beam from a light emitting part of an optical sensor 1 passes through or cuts off a waveform part of a corrugated high frequency cable (a), is digitalized by a waveform shapeing circuit 2. Lengths with every single period of the waveform are measured as respective pitch lengths by a pitch length measuring part 3, and are stored in a stroage part 4, and are sent to a pitch length distribution processing part 5 and a pitch length statistics processing part 8. The processing part 5 finds a distribution chart of an axial directional pitch length of the cable. A peak section specifying operation part 6 specifies a peak section between two peak lengths, and a physical pitch variation calculating part calculates a pitch variation L of the peak section. On the other hand, a voltage standing wave evaluating part 9 evaluates a specific value of the voltage standing wave ratio of the cable on the basis of a distributed value from the processing part 8. Data of the calculating part and the evaluating part 9 is outputted from an output part 10.;COPYRIGHT: (C)1996,JPO