| 摘要 |
PROBLEM TO BE SOLVED: To provide a directivity angle measurement system and a directivity angle measurement method capable of accurately measuring a directivity angle of a photodetector with a simple method.SOLUTION: A control unit 40 causes a slit 30 for limiting a luminous flux only in the vicinity of an optical axis center to be placed to perform first measurement for detecting light current, causes a slit 31 for making a luminous flux having width wider than that in the slit 30 transmit to be placed to perform second measurement for detecting light current generated by a photodetector 20, and makes a storage unit 44 store a light current value detected by the first measurement as a measured light current value and a light current value detected by the second measurement as a correcting light current value. A maximum light current value specification unit 45 specifies a maximum correcting light current value among a plurality of corrected light current values, and a light current value correction unit 46 uses the maximum correcting light current value and the correcting light current value to calculate a corrected light current value obtained by correcting the measured light current value. |
