A wireless strain sensing device uses a plurality of wireless sensors to obtain individual local strain data on the spot (area) where the wireless sensor is disposed on a stress member using a specific frequency response that is scanned externally. The resonance frequency shifts accordance with the locally applied strain on the specific point of the stress member. The change in the resonance frequency in response to the local strain can then be allocated within a limited spectral range for each of the wireless sensors. This permits a plurality of wireless sensors, each having a different initial resonance frequency, to be read concurrently and distinguished.
