Vibrating Wire Shotcrete Stress meter is used to measure stress in the radian and the tangential direction of tunnel shotcrete.
Once the gage is strained, frequency of vibrating wire will be changed, At this time a plucking coil generate resonance frequency and send it to the measuring instrument.
The measuring instrument will show this signal after changing it into strain. Then it is converted into stress by the given conversion factor and modulus of elasticity of Shotcrete, and measured strain.