Optical crosstalk calibration for ranging systems
Assigneeams Sensors Singapore Pte. Ltd.
InventorsMiguel Bruno Vaello Paños, Javier Miguel Sánchez, Cassian Strässle, Liming Chen
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Abstract
The present disclosure describes calibration methods for optoelectronic modules with active illumination, such as 3D ranging systems. Calibration methods include determining cross-talk calibration parameters for an optoelectronic module having an emitting channel and a receiving channel where the optoelectronic module is operable to demodulate modulated light incident on the receiving channel. Cross-talk calibration parameters are saved to a readable storage medium and recalled during distance measurements to an object or objects in a scene.
Claims16
A calibration method, the method comprising:
- determining cross-talk calibration parameters for an optoelectronic module having an emitting channel and a receiving channel, the optoelectronic module being operable to demodulate modulated light incident on the receiving channel, wherein said determining comprises:
- directing modulated light from the emitting channel;
- sampling cross-talk-target signals generated in the receiving channel, wherein the cross-talk-target signals correspond to incident modulated light due to cross-talk between the emitting channel and the receiving channel, and wherein sampling cross-talk-target signals includes performing optical power measurements of the incident modulated light
- deriving the cross-talk calibration parameters from the cross-talk-target signals, wherein the cross-talk calibration parameters comprise one or more of:
- an amplitude of the cross-talk-target signal, a phase of the cross-talk-target signal, and/or a cross-talk-target signal offset, wherein the cross-talk-target signal offset corresponds to a total intensity of the cross-talk-target signal;
- and
- storing the cross-talk calibration parameters on a readable storage medium.
Dependencies are inferred from the claim text.