Method and device for acquiring linear relationship between laser power and detector photocurrent

The invention provides a method for acquiring a linear relationship between a laser power and an array detector photocurrent. The array is 1*N linear array. The power is P. The photocurrent is C. The linear relationship is a N*N matrix A. The method comprises the steps of a first step, starting a j-th laser and keeping other laser in an off state, wherein j is an integer selected from 1,2,3,...,N; a second step, measuring the output power Pj of the j-th laser, and respectively measuring photocurrent Ci (i is an integer selected from 1,2,3,..., N) of N detectors; a third step, calculating all elements of a j-row through a formula aij=Ci/Pj; a fourth step, aiming at different values of j, circulating the first step to the third step until N lasers are respectively started one by one, and calculating for obtaining all elements aij of the matrix A-1; and a fifth step, performing inverse operation on the matrix A-1 for obtaining a matrix A. The matrix A which is obtained through the method can ...