Point source transmittance testing system and method based on weak light pulse signal synchronous detection

Abstract

The invention discloses a point source transmittance test system and method based on weak light pulse signal synchronous detection, and solves the problems that the measurement sensitivity of an existing test system is limited, the measurement result is uncertain and the like. The test system comprises a laser, a beam shaping unit, a collimation unit, a detector, a lock-in amplifier, a signal generator, a darkroom and a control unit, the laser is a pulse laser; pulse laser passes through the beam shaping unit and the collimation unit to form parallel beams; a rotary table is arranged in the darkroom, is positioned at the light emitting end of the collimation unit and is connected with the control unit; the detector is mounted on the rotary table, is positioned on the image surface of the optical system to be detected, and is connected with the lock-in amplifier; one output end of the signal generator outputs a trigger signal to the laser; the other output end outputs reference signals with the same frequency to the lock-in amplifier; the lock-in amplifier performs cross-correlation processing on the to-be-measured signal in combination with the reference signal, and the control unit calculates to obtain the corresponding point source transmittance.

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