Abstract: The life of infrared earth sensor can not be validated because of its life limitation, weak parts are confirmed through reliability analysis and a life test is designed to carry out test verification on the ground. The combination of real life test and accelerated life test is taken to simulate the working environment in orbit, in order to assess the actual life of the product and know the real situation of operating performance and failure mode of tested pieces in the extreme condition product sealing function failure at the end of its life. It is shown that test pieces are working in a stable period, by analyzing key parameters of the life test and test data of shafting run in the extreme condition. It can be drawn from reliability analysis and life test data that the 3 years practical lifetime of infrared earth sensor for the target spacecraft has a greater margin and the life test can be used to verify the actual life of the product further.

Key words: infrared earth sensor, life analysis, life test, extreme condition, experimental verification