photoelectric alarm

例句：

1. 1.The photoelectric alarm system is designed to protect against intruders.
   光电报警系统旨在保护免受入侵者侵扰。
2. 2. The police used a photoelectric alarm to detect the thief's presence.
   警方使用光电报警器来探测小偷的存在。
3. 3. The new security system incorporates a photoelectric alarm, ensuring immediate response to any potential threats.
   新安全系统集成了光电报警器，确保对任何潜在威胁的立即响应。