| 摘要 |
A system and method for detecting an object on a cart, including a support structure, a cart detector and an object detector provided to the support structure and an alert device. The cart detector including a first sensor and a second sensor that are positioned to detect predetermined cart portions as a cart transitions from the first sensor to the second sensor. The object detector including a third sensor and a fourth sensor positioned to approximately simultaneously detect an object on the cart while not detecting upright elements of the cart. Preferably, the cart sensors and object sensors also measure distances to obstructions so that the distances can also be analyzed to determine that a cart and/or object is present.
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