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Choose a fiber-optic sensor when the detection point defeats a standard photoelectric sensor: the target is too small for a standard beam spot, the space is too confined for a sensor body, or the detection point sits near heat, vibration or electromagnetic interference that the electronics cannot tolerate. A fiber-optic system splits the job — a small fiber head guides light to the detection point while the amplifier with the electronics mounts elsewhere. Select the fiber head for the target and environment, then the amplifier for response and output.
Fiber optics is an installation answer, not a different physics. The sensing is still photoelectric; the fiber simply moves the light's entry/exit point away from the electronics. Choose it when geometry or environment, not detection principle, is the problem.
Select head first, amplifier second. The fiber head decides what can be detected (spot size, working distance, temperature tolerance); the amplifier decides how fast and how the signal reaches the controller.
Small-target capability is a spot-size question. The beam spot at the target must be smaller than the target's relevant feature; fiber heads with focused or narrow-beam optics exist for exactly this.
Bend radius and contamination are real constraints. Fiber cables have minimum bend radii and the head face must stay clean — include routing and cleaning access in the mechanical design.
