| 摘要 |
Procedure and means by which the degree of cross-linking of primarily PEX plastic can be measured when manufacturing cable insulation or piping of polyethylene plastic. It has been observed in the invention that the intensity of the fluorescence (15) of PEX plastic increases as a function of the degree of cross-linking. The means comprises a laser (10) for focussing a modulated laser light beam (14) producing fluorescence on the sample (13), and an electronic light detector (16) for detecting the fluorescent radiation (15) produced by the sample (13). In front of the light detector (16) is placed a filter (17) absorbing the exciting light, whereby the electronic signal from the light detector (16), which is proportional to the degree of cross-linking, may be carried to requisite electronic amplifiers (18) and other signal processing systems (19, 20) to output the degree of cross-linking of the sample (13). The means of the invention is suitable for on-line measurement in an extrusion machine. |
