Stone detector

Details Stone detector Stone detector

1975-09-02

1977-05-31

McGraw, Vincent P.

Optics: measuring and testing

Infrared and ultraviolet

250223B, 250338, 250341, 356 33, 356240, G01N 2134, G01N 2132

Patent

active

040266567

ABSTRACT:
An improved device for detection of stones in the sidewalls of glass containers. Stones in the sidewalls of glass containers cause stress patterns to be formed. These patterns are visible if the glass container is viewed through crossed polarizing filters due to the refraction of polarized light. A television camera and electronic analysis circuit may be substituted for the human eye. The detection capability and reliability of the system is improved if the glass container is illuminated with primarily infra-red radiation. Then, polarizing filters which polarize infra-red radiation and remove visible light are used. A filter before the television camera lens removes far infra-red radiation and allows only near infra-red radiation to be measured. This makes the device insensitive to glass color, flutes or stippling and improves the signal to noise ratio.

REFERENCES:
patent: 1681991 (1928-08-01), Littleton, Jr.
patent: 1934187 (1933-11-01), Glasgow et al.
patent: 2798605 (1957-07-01), Richards
patent: 3411005 (1968-11-01), Taylor

Affiliated with

Also associated with

Rating

Stone detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Stone detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stone detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-654965