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Position Sensing DetectorsThorlabs offers position sensing detectors based on photodiode sensors or thermopile sensors. Our photodiode position detectors use either a lateral effect or a segmented quadrant design. They can be controlled using the K-Cube PSD Auto-Aligner and can be incorporated into open- and closed-loop applications. Our thermopile position detectors consist of thermal power sensor elements arranged in a quadrant design. They feature C-Series connectors for use with a compatible power meter console.