Process and apparatus for optically checking perforations in hol

Details Process and apparatus for optically checking perforations in hol Process and apparatus for optically checking perforations in hol

1989-09-15

1991-10-01

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

356237, G01N 2100

Patent

active

050540874

ABSTRACT:
A process for optically checking perforations in a hollow article, particularly the micro-perforations in the vicinity of the leading or trailing edge of a hollow turbine blade for a turbo-shaft engine, comprises illuminating the inner cavity of the article through an opening at one end thereof, scanning the length of the article by means of a video camera and making a record of the luminance of the reflected light received by the camera through the perforations to be checked, converting the sequence of the data thus collected into electric signals, storing the said signals in a computing and storage unit, and processing and comparing the signals with a predetermined train of reference signals derived from a standard article.

REFERENCES:
patent: 343656 (1969-04-01), McCartney
patent: 3495915 (1970-02-01), Watson et al.
patent: 3680966 (1972-08-01), Cofek et al.
patent: 4484081 (1984-11-01), Cornyn, Jr. et al.
patent: 4555798 (1985-11-01), Broadbent, Jr. et al.
patent: 4687328 (1987-08-01), Shiraishi et al.
patent: 4766325 (1988-08-01), Merkenschlager et al.
patent: 4783751 (1988-11-01), Ehrlich et al.
patent: 4803639 (1989-02-01), Steele et al.
patent: 4901361 (1990-02-01), Glenn et al.
Microtecnic, No. 4, 1976, p. 30, Reader Service No. 39, Zurich, CH, "Rolls Royce Reduce Inspection Time From 3 Hours to 10 Minutes."

Affiliated with

Also associated with

Rating

Process and apparatus for optically checking perforations in hol does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process and apparatus for optically checking perforations in hol, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and apparatus for optically checking perforations in hol will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1761365