A proposed range compensating lens for non-imaging active optical systems

Jason Mudge

(Golden Gate Light Optimization)

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Date: October 30, 2019


In many active optical systems where the light is supplied such as a range finder or optical radar (LiDAR), there is a possibility that the detector (pixel) can be destroyed if significant signal is returned or at the very least blinded for a period of time. This is because the designer struggles with the “one over range squared” loss which can amount to significant attenuation in the return signal given the range requirements. When pushing the range limit requirement, the sensor is in need of a large dynamic range detector and/or some form of detector protection when the target is quite close. This work proposes a lens that attempts to compensate for range signal loss passively and instantaneously by combining lens elements in parallel rather than in series as is typically done [Mudge Appl. Opt. 58, (2019)]. The proposed lens is relatively simple and compensates for range albeit not perfectly. Additionally, a discussion is provided to implement this approach along with a variety of examples of a range compensating lens [Phenis et al. Proc. of SPIE, 11125, (2019)]. These designs cover techniques and include some of the penalties incurred.

Created: Monday, November 4th, 2019