| 摘要 |
The invention relates to a device and a method for measuring the strain of elongated objects such as turbine blades, and in particular a device for measuring the strain in a strain direction of a body provided with a series of markings which can be optically monitored and extend with a directional component in the strain direction, comprising: an optical pick-up element; imaging means for imaging the markings on the optical pick-up element; fixation means for fixing the optical pick-up element and the imaging means perpendicularly of the strain direction; a processing element for processing the electrical signals coming from the pick-up element; a memory for storing the signals coming from the processing element; and a comparing element for comparing signals coming from the memory with signals coming from the processing element, and deriving from the comparison a signal representing the strain of the body. It is possible with this device without the blades having to be taken out of the turbine.
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