Method and device for examining the strain of elongated bodies
First Claim
1. 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;
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Abstract
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.
30 Citations
18 Claims
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1. 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:
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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;
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Method for measuring the strain of bodies provided with a series of markings which can be optically monitored and extend in a measuring direction, comprising the following steps of:
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placing an optical pick-up element in the vicinity of the body for measuring;
fixing the pick-up element transversely of the measuring direction;
imaging the body on the pick-up element and deriving from the depicted image a signal representing the position of the markings; and
storing the signal;
repeating the first three steps after a period of time, and comparing the stored signal with the signal coming from the pick-up element, and deriving a value for the strain by means of the comparison. - View Dependent Claims (16, 17, 18)
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Specification