WATCH: Tech-savvy art historian Andrew Tallon uses lasers to unlock the builders' secrets behind the construction of the National Cathedral in Washington, D.C.

We describe the use of fiber Bragg grating based lasers as sensors. An interferometric detection technique is presented for interrogating laser wavelength shifts due to measurand induced laser cavity ...

💡 What it is: A laser tripwire system that can trigger an alarm. 🛠 Tools needed: Laser pointer, light sensor (LDR), Arduino, buzzer. 📘 Skill level: Intermediate 🔐 Fun and useful for learning about ...