How to detect/identify reinforcement bars inside the hardened concrete?

Hello,

A rebar locator can definitely identify the presence of a Steel reinforcement rebar as well as its orientation inside the concrete surface.

A rebar locator itself indicates its meaning.

Actually, we can use a pulse indicator method which is totally based on electromagnetic pulse induction Technology to detect rebars.

Thank you.  

Hi, Following are some process to identify the defects and done inspection of Steel bars in reinforcement concrete

1. Eddy current Technique,
2. Single frequency method,
3. Microwave heating of numerical modelling,

Refer this methods in ACI for details practical use.