Detecting damage to bulk material

Details Detecting damage to bulk material Detecting damage to bulk material

1976-04-16

1977-10-18

Swann, III, Glen R.

Communications: electrical

Systems

Call station

340261, 340409, G08B 1304, G08B 2900

Patent

active

040548678

ABSTRACT:
Damage to sheet glass is detected by monitoring with a piezo-electric sensor vibrations at ultrasonic frequencies propagated in the glass. Cutting, scoring or chipping of glass generates a frequency spectrum having high frequency components at greater than 100 kilohertz and particularly at about 300 kilohertz. By selective detection at these frequencies cutting, scoring and chipping are distinguished from lower frequency vibrations due to wind and traffic rumble. Cutting and scoring are distinguishable from chipping because the high frequency components occur in numerous bursts in the former against but few bursts in the latter. Shattering of the sheet glass is detected by the high energy of much larger amplitude high frequency components produced thereby. Apparatus to carry out these functions is described and finds particular use in an intruder alarm system.

REFERENCES:
patent: 2524579 (1950-10-01), Taylor
patent: 3147467 (1964-09-01), Laakmann
patent: 3579220 (1971-05-01), Stevenson, Jr.

Affiliated with

Also associated with

Rating

Detecting damage to bulk material does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1449591