Photoelectric conversion efficiency test device and method

The invention discloses a photoelectric conversion efficiency test device and method. The device comprises a laser, a beam expanding mirror, a variable diaphragm and a laser cell. The laser emits a laser light beam. The beam expanding mirror converts the laser light beam into a divergent beam and sends the divergent beam. The variable diaphragm adjusts the divergent beam into an emission beam witha preset aperture and sends the emission beam. The laser cell receives the emission beam of the variable diaphragm. The size of laser spot of the emission beam is the same as that of the laser cell.According to the invention, technical problems of failure of free adjustment according to the size of the cell and complex structure caused by the fact that emission and receiving devices are requiredfor laser energy transmission and conversion in the prior art are solved; and technical effects of simultaneously measuring change relations of the photoelectric conversion efficiency of the laser cell along with the power den