METHOD FOR ALIGNING OPTICAL AXES IN LIGHT TRANSMISSIVITY MEASURING APPARATUS

摘要

PURPOSE:To make is possible to take a rapid measure when the non-coincidence of optical axes was generated during operation, by outputting light or sound by an alarm means when the optical axis of a floodlight projector coincides with that of a light receiver. CONSTITUTION:The luminous flux 11 from a floodlight projector 1 is projected to a light receiver 2 and the floodlight projector 1 or the light receiver 2 is adjusted by an optical axis adjusting mechanism while it is confirmed whether the effective diameter (d) of the light receiving area of the light receiver 2 enters the diameter D of the luminous flux 11 by an alarm means (light emitting diode or buzzer). When the effective diameter (d) of the light receiving area is included in the diameter D of the luminous flux 11, the coincidence of optical axes is confirmed by the output from the alarm means and, thereafter, the luminous flux 11 of the floodlight projector 1 is contracted by an iris 5. The adjustment of the floodlight projector 1 and the light receiver 2 is performed by the optical axis adjusting mechanism while it is confirmed whether the effective diameter (d) of the light receiving area coincided with the diameter D' of contracted luminous flux by the alarm means to align the optical axes of both of them.