| 摘要 |
PURPOSE:To measure accurately a narrow gap between rod bodies at the inner part of rod bodies stood in an array by fitting a probe chip which has strain gauges on both side faces of the front end part of a thin elastic plate. CONSTITUTION:Rectangular window holes 2 and 3 are formed in the front end part of the thin elastic plate 1 at distance in the lengthwise direction of the plate 1, a couple of spacers 4 and 5 are fixed to the edge part of the window hole 2 at front end sides of both side faces of the plate 1, and probe chips 8 and 9 paired with spacers 6 and 7 for chips are fitted one over another to both side faces between the window holes 2 and 3 of the plate 1. Further, the strain gauges 14 and 15 are adhered to the nearly center parts of the internal surfaces of the triangular shape parts of the chips 8 and 9. Then, when the measuring probe is inserted into the gap between fuel rods from its tip side, the chips 8 and 9 flexes to vary the electric variation between the gauges 14 and 15, and the output of a bridge circuit is passed through an A/D converter 21 and displayed on a display device 22 as a measured value of fuel rod gap size.
|
