Abstract
In this paper, a new optical technique involving the medium infrared (MIR) pulse collimated beam and thermopile sensor head was developed to rapidly and accurately measure the back focal length (BFL) of the MIR silicon lens. In this method, the MIR pulse collimated beam is focused by a MIR silicon lens. The thermopile sensor head detects the focus of the MIR silicon lens and the BFL of the MIR lens can be measured simultaneously by an autocollimator and a linear optical encoder in accordance with the geometrical optics. The new optical technique is a promising method for measuring BFL of MIR lens. In the experimental results, the BFL deviation estimated has an accuracy of 2%. The advantages of this device is low costs, fast speed, high accuracy, simple system and replacements of light source and detector are different spectral ranges for measuring BFL of the MIR lens.
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