| 摘要 |
PURPOSE: A stacked material monitoring system using a light is provided to allow the authorized personnel manage the stacked material rapidly by informing existence and nonexistence of the stacked of the authorized personnel. CONSTITUTION: In a stacked material monitoring system using a light, a light is generated and the generated light is reflected. The direct and reflected light is recognized. The block of the light is recognized. The existence and nonexistence of the stacked material are determined by measuring a time of shielding the light. The existence of the stacked material is noticed to the authorized personnel.
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