研究目的
To evaluate the performance of a flexible electret sensor array for ultrasonic object detection in short distances, contributing to monitoring human life activity and remote operation of home appliances.
研究成果
The ultrasonic sensor array using flexible electret elements can detect objects in short distances with good agreement in estimated distance but with errors in estimated angles due to the limited number of receivers. This suggests potential for omni-directional object detection with more receivers.
研究不足
Large errors were observed for the estimated angles because only three receivers were used for ECS array.
1：Experimental Design and Method Selection:
Fabrication of electret condenser sensors (ECS) with silica-agglomerate electret for ultrasonic object detection.
2：Sample Selection and Data Sources:
Use of PVC pipes as objects for detection.
3：List of Experimental Equipment and Materials:
Aluminum film electrodes, ultra-thin PTFE layers, silica agglomerates, PET sheet, PCB.
4：Experimental Procedures and Operational Workflow:
Attachment of ECS array on PVC pipe, emission of burst waves, detection of reflected waves, and calculation of object position.
5：Data Analysis Methods:
Determination of traveling time of ultrasound and calculation of object position using sound velocity in air.
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