| 摘要 |
PROBLEM TO BE SOLVED: To obtain an antenna capable of being introduced into an opening smaller in diameter in a container while being folded, being forcibly opened inside the container and being drawn out while being forcibly folded by providing a device which forcibly execute movement for folding and closing a paraboloial shield and movement for extending and opening it. SOLUTION: In a filled level measuring instrument 1, a paraboloidal antenna 3 is connected to an antenna pipe 13 among an equipment flange 11, a microwave element and a receiver 14 so that the paraboloidal shield 31 to be symmetry with the horizontal symmetrical axis line of the antenna pipe 13 as a center. Microwave is radiated towards the inner wall of the paraboloidal shield 31 by the transmitting part of the transmitter-receiver 14. Here, the paraboloidal antenna 3 is provided with devices (an adjusting device 15, an adjusting material, a slider, a pulling coil spring and a spring conductive device) which forcibly execute movement for folding and closing the paraboloidal shield 31 and movement for extending and opening it. |
