压力传感器应变片是如何贴片的

heshaoyu88

　　电线电缆应变式压力传感器的贴片过程需要精细操作和严格的质量控制，以确保测量精度和长期稳定性。以下是压力传感器贴片的关键步骤及注意事项：
　　一、贴片前准备
　　工具与材料
　　应变片（选择合适类型，如箔式或半导体式）、粘接剂（如氰基丙烯酸酯快干胶或环氧树脂胶）、丙酮或无水酒精、砂纸（400#——600#）、脱脂棉、导线、焊接工具、万用表、防护材料（如硅胶）等。
　　弹性体表面处理
　　打磨：用砂纸打磨贴片区域，去除氧化层并形成粗糙表面（增强粘接力）。
　　清洁：用丙酮或酒精彻底清洁表面，确保无油污、灰尘。
　　应变片检查
　　连接器用万用表检测应变片电阻值，确保无断路或短路，阻值符合标称值（如350Ω或750Ω等）。
　　二、贴片步骤
　　定位与方向
　　外壳应力分析：根据弹性体受力方向（如轴向、弯曲或剪切应变），确定应变片粘贴位置及方向（通常沿主应力方向）。
　　标记：用记号笔或激光划线标出贴片位置，确保方向与受力方向一致。
　　涂胶与粘贴
　　涂胶：在应变片基底或弹性体表面均匀涂抹薄层粘接剂。
　　贴合：用镊子将应变片轻压到预定位置，挤出多余胶水和气泡。
　　加压固化：用硅胶垫或夹具施加均匀压力（如0.1——0.3MPa），按胶水要求固化（室温固化需数小时，加热可加速）。
　　焊接导线
　　引出线固定：用胶带或点胶固定导线，避免拉扯应变片。
　　焊接：使用低温焊锡快速焊接，防止过热损坏应变片。
　　保护措施
　　密封防护：涂覆硅胶或环氧树脂保护层，防潮、防腐蚀。
　　屏蔽处理：必要时加金属屏蔽层，抗电磁干扰。

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