How to Detect Clear PET Bottles and Transparent Film at High Speed

• time：2026-10-10 15:22:01
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Detect clear PET bottles and transparent film by choosing a sensing arrangement that does not depend on the target blocking light the way an opaque object does: polarized retro-reflective sensors designed for clear objects, or ToF distance-based photoelectric sensors that evaluate target distance rather than received light intensity. KJT Sensors' ToF photoelectric family states transparent-object detection capability with switching frequencies up to 1,000 Hz. Validate with actual bottles or film at full line speed, including strong ambient light.

Key Takeaways

• Transparency breaks the standard assumption. Standard diffuse and through-beam sensors assume the target strongly reflects or fully blocks the beam; clear PET and film transmit most of the light, so the sensor sees "no target" or an unstable edge.

• Two arrangements work in practice: clear-object polarized retro-reflective sensors (the polarization system stabilizes the small signal change a clear target produces) and ToF distance-based sensors (the target is detected by its distance, not its opacity).

• Speed and ambient light are separate checks. Transparent-target capability does not imply the sensor is fast enough or sunlight-immune — verify response time/switching frequency against line speed and test under the site's actual lighting.

• Sample testing is mandatory. Bottle wall thickness, shape, labels, caps, film tension and condensation all change the signal; only the real target at real speed proves the arrangement.