Application of tolerance analysis to temperature measurement circuit of space camera

In order to improve the temperature measurement accuracy of space cameras,the tolerance analysis is applied to temperature measurement circuits.The principle of a temperature measurement circuit is studied and a variety of influencing factors of temperature measurement accuracy are discussed.Several kinds of tolerance analysis methods are described,and their respective advantages and disadvantages are compared.Then the worst-case analysis method is chosen to analyze the tolerance of the temperature measurement circuit.Finally,a novel method for improving temperature measurement accuracy is proposed according to the analysis results.After validating proposed method,it is shown that the measurement accuracy of the improved temperature measurement circuit is ±0.3℃,30 times higher than that of the original method,which can meet the requirements of temperature measurement in-14 ℃-+50 ℃.