The utility model discloses an OCT system sensitivity measuring device which comprises an OCT system and a measuring mechanism, the measuring mechanism comprises a sampling arm and a sampling object, the sampling arm comprises a variable optical attenuator and an optical fiber lens, the variable optical attenuator, the optical fiber lens and the sampling object are coaxial, the OCT system is connected with the first end of the variable optical attenuator, and the optical fiber lens is connected with the second end of the variable optical attenuator. And the second end of the variable optical attenuator is connected with the optical fiber lens. According to the device, the attenuation in the sampling arm can be conveniently adjusted, the high quality of a sampling optical signal is ensured, the system noise can be directly measured by using the OCT system, the sensitivity of the whole OCT system can be simply, conveniently and accurately obtained, an expensive light beam analyzer and an optical spectrum analyzer (OSA) are not needed, and the cost is reduced. And the optical receiver noise of the OCT system is also included, so that the OCT system is very suitable for being used in actual production.
Sensitivity measuring device for OCT (optical coherence tomography) system