Method and arrangement for determining an at least approximately

Details Method and arrangement for determining an at least approximately Method and arrangement for determining an at least approximately

1994-04-04

1995-08-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

25022732, 128645, 128652, A61B 316

Patent

active

054401402

ABSTRACT:
A method and arrangements for determining an at least approximately circular contacting surface is disclosed. The primary object of finding a simple way of objectively determining the contacting surface of a deformable medium on a plane surface with high accuracy and at a low technical expense is met according to the invention in that a film waveguide is used as a plane surface. An incoherent, parallel, homogeneous bundle of light whose width widens one-dimensionally is coupled into this film waveguide and the decoupled light is fed to a photoreceiver array for recording one-dimensional intensity distributions. An evaluating unit generates a difference curve from a normal curve without contacting medium and from a measurement curve with contacting medium and the exact diameter of the contacting surface is determined from the distance of two associated extremes of the difference curve. The method and arrangements are preferably used in ophthalmology for the measurement of the applanation circle at the tonometer and for measuring liquid drops for the purpose of analysis.

REFERENCES:
patent: 3913390 (1975-10-01), Piazza
patent: 4622459 (1986-11-01), Bouge et al.
patent: 4735209 (1988-04-01), Foody
patent: 4987899 (1991-01-01), Brown
patent: 5070875 (1991-12-01), Falck et al.
patent: 5148807 (1992-09-01), Hsu
patent: 5203331 (1993-04-01), Draeger

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