| 摘要 |
The invention relates to a sensor pipe (3, 13) for determining the concentration curve of a medium along a path. A pipe (1) of a material highly permeable by the medium is completely coated on the inside with a thin film (2) of a material which is poorly permeable by the medium. A pipe (6) of a material easily permeated by the medium may also be coated on the inside with a material which is impermeable or poorly permeable by the medium, a narrow strip (6a) being left free in the longitudinal direction of the pipe (6). In addition, a strip (8, 9, 14) consisting of an impermeable or poorly permeable material for the medium can be bent in the shape of a trough, leaving a slot-like aperture. Here, the slot-like aperture is closed off by a strip (8a, 10, 15) of a medium-permeable material in the longitudinal direction of the strip (8, 9, 14). |
