| 摘要 |
An apparatus for testing the quality of a sheath of the polyethylene type on a test piece based on the transparency of polyethylene to infrared radiation. The apparatus includes a glass tank (5) containing a bath (4) of refractive index that is close to the refractive index of polyethylene, a test piece (1) received in the tank, a lighting assembly (11) for illuminating the test piece by a light beam (12) of limited aperture angle (a) passing through a light-diffusing screen (10) having narrow diffusion lobes, and an infrared detection assembly (15, 16) for detecting the beam passing through the test piece. The apparatus may be applied for testing the sheaths on splice boxes and on repeater casings.
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