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ERIC Number: EJ891995
Record Type: Journal
Publication Date: 2007-Apr
Pages: 2
Abstractor: As Provided
Reference Count: 2
ISSN: ISSN-0031-921X
Measuring the Thickness of a Transparent Ring with a Laser
Leung, Alfred F.
Physics Teacher, v45 n4 p239-240 Apr 2007
There seems to be no reasonable way to measure the thickness of a narrow-mouth glass bottle. One can measure the outer and inner diameters of the mouth with a ruler or a pair of calipers and then calculate the thickness. However, this measurement might be interfered with by the threads at the mouth. Furthermore, it is uncertain whether the thickness at the mouth is the same as that of the body. An optical method has been proposed. It requires the alignment of an incident laser beam tangent to the bottle and the measurement of the angle of laser light refracted out of the bottle. Here, another method for measuring of thickness is presented. It is first tested on a transparent ring, because the thickness of the ring can be easily measured. The method is then applied to measure the thickness of narrow-mouth glass bottles.
American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A