METHOD OF MEASURING MISALIGNMENT OF OPTICAL FIBER IN CONNECTING TIP Russian patent published in 1995 - IPC

FIELD: measurement technology. SUBSTANCE: connecting tip with fiber is fixed for rotation about its own axis. Free end of fiber is illuminated by light source. Electron unit measures coordinates which are used for judging value of shift of center of light spot relatively center of revolution. Edge of mirror shutter is set into position at which it passes through center of revolution of basic surface of the tip. Light flux being reflected from mirror shutter is measured at four mutual perpendicular positions of optical fiber. In order to coincide edge of mirror shutter with center of revolution of basic surface of connecting tip, the edge of mirror shutter is shifted relatively end of tested optical fiber at first and connecting tip. Intensity of radiation reflected from mirror shutter is measured and then the shutter is set into position at which intensity of reflected light flux is equal to half sum of minimal and maximal intensities. In this case angular position of the optical fiber with connecting tip is defined by rotation about its axis at that position of the shutter at which intensity of light radiation reflected from mirror shutter is minimal or maximal. After that connecting tip is set at one of these positions and optical fiber is rotated to 90 deg. Values of minimal and maximal intensities are measured repeatedly by means of shifting mirror shutter relatively end of optical fiber and connecting tip. Then edge of mirror shutter is set into the position which corresponds to half sum of values of intensities achieved. After edge of mirror shutter is coincided with center of revolution of basic surface of connecting tip, the constant component is compensated and maximal amplification is introduced. Measuring circuit is calibrated for dial of shifter which determined portions of microns. Then edge of mirror shutter is coincided again with center of revolution of basic surface of connecting tip. Measurements are conducted and values measured are used for determining misalignment and angular shift of the line, which connects center of revolution of basic surface of connecting tip and center of light radiation. EFFECT: improved precision of measurement. 3 cl, 1 dwg