Diagnosis of the defective state of a bolometric detection array

摘要

Method of diagnosing the state of signal-forming chains of a detector including an array of detection bolometers, each chain comprising a bolometer, a circuit of stimulation, and a circuit forming a signal according to said stimulation, including forming an image of a substantially uniform scene on the array; applying at least first and second stimulations to the chains; reading the formed signals; and for each chain in a predetermined set, defining a neighborhood of chains; calculating coefficients of a polynomial interpolating the values of signals formed by said chain; calculating, for each chain of the neighborhood, coefficients of a polynomial interpolating the values of signals formed by said neighborhood chain; calculating an average and standard deviation of said coefficients of the neighborhood chains or of the set of neighborhood chains and said chain; and diagnosing if said chain is defective using the coefficients and the calculated average and standard deviation.

主权项

1. A method of diagnosing the defective state of signal-forming chains of a bolometric detector comprising an array of detection bolometers suspended above a substrate, each chain comprising a bolometer of said array, a circuit of electric stimulation of said chain, and a circuit for forming a signal according to the stimulation applied to said chain by the stimulation circuit, said method comprising:
a. forming an image of a substantially uniform scene on the array of bolometers; b. applying at least a different first and second stimulations to the chains; c. reading the signals formed by the chains corresponding to the applied stimulations; and d. for each chain of a predetermined set of chains to be diagnosed:
defining a neighborhood formed of chains having detection bolometers which are neighbors to the detection bolometer of said chain;calculating coefficients of a polynomial interpolating the values of the signals formed by said chain according to said at least one first and second applied stimulations;calculating for each chain of the neighborhood of said chain, coefficients of a polynomial interpolating the values of the signals formed by said neighborhood chain according to the at least one first and second applied stimulations;calculating an average and a standard deviation of said calculated coefficients of the neighborhood chains or of the set formed of the neighborhood chains and of said chain; anddiagnosing that said chain is defective if the value of said coefficients thereof is outside of margins defined according to the calculated average and standard deviation.