💡 Fun fact: Some models used visible red beams at night—a faint glow that warned intruders they were being watched.
⚙️ The Science Behind the System: Photoelectric Beams
The Detect-O-Ray operated on the photoelectric principle—the same science that powers solar panels and automatic doors.
Here’s how it worked:
Transmitter Unit: Sent out a continuous beam of light (often infrared).
Receiver Unit: Detected the beam and kept the circuit closed.
Interruption = Alarm: When the beam was broken (by a person, pet, or falling object), the receiver triggered a loud bell or buzzer.
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