Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1997-11-04
1999-11-09
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250343, 25033912, 25033911, G01N 2101, G01J 158
Patent
active
059819510
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method to determine the presence of one or several components in a e.g. liquid substance by means of spectroscopy including an illumination of the substance with light of at least one wave length and detecting transmitted and/or reflected light as well as analyzing the reflected light characteristics.
The invention also relates to a system for performing the method and an ambulatory registration system.
2. Brief Description of the Related Art
Methods and systems essentially for measuring e.g. the blood sugar content are already known in the art. The known systems use in many cases optical measurements, in which a blood carrying body portion, such as a finger tip, are illuminated with light of several different wave lengths, the transmitted or reflected light then being analyzed by means of differential spectroscopy to distinguish between various components and to define the amount of interesting such ones. In measurements of this known type the measuring accuracy will in many cases be not fully satisfactory and not comparable with analytic measurements.
SUMMARY OF THE INVENTION
The present invention relates to a method and a system offering an increased accuracy during measurements basing on differential spectroscopy in general and especially for noninvasive, to blood compositions related measurements.
Thus, the invention relates to a method according to the first part of the attached claim 1. The method is especially characterized in what is specified in the characterizing part of said claim.
Moreover, the invention relates to a system according to the first part of the attached claim 10. The system is especially characterized in what is specified in the characterizing part of said last mentioned claim.
The invention also relates to an ambulatory registration system according to the first part of the attached claim 15. The system is especially characterized by what is stated in the characterizing part of claim 15.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described here below in connection with an execution example and the attached drawing, on which:
FIG. 1 shows a scheme in principle of a first embodiment of a system according to the invention;
FIG. 2 shows schematically and in more detail a system according to FIG. 1 during a measurement of a finger tip;
FIG. 3 shows schematically a step response for a system according to FIG. 1;
FIG. 4 shows schematically the light absorption for various wave lengths;
FIG. 5 shows schematically the rotation of a plane-polarized beam of rays and a detection; and
FIG. 6 shows schematically an ambulatory registration system according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1 item 1 designates devices to illuminate a substance 2 arranged with a within a vessel 3 comprized liquid 4, and as an alternative a finger tip 5 with light of at least one well defined wave length, but preferably a multiple of well defined wave lengths, at least some wave lengths preferably lying within the almost infrared area. Item 6 designates devices for detecting transmitted and/or reflected light, to varying extent passing through the substance and thereby being effected by means of absorption in the substance, the absorption being related to wave length and substance. Item 7 designates devices for analyzing detected light in relation to light approaching the substance by means of a method of spectroscopy, generally called differential spectroscopy, where several wave lengths are used. This kind of technology is already known in the art and is described in U.S. Pat. No. 5,222,495.
According to the present invention devices are provided for determining completing characteristics besides the mere absorption determination.
According to a first embodiment, the detecting devices are adapted to define extremely fast processes, i.e. to detect during extremely short time periods, so that a detailed step response corresponding to an approaching light pulse might be determi
REFERENCES:
patent: 4309112 (1982-01-01), Ashley et al.
patent: 4855930 (1989-08-01), Chao et al.
patent: 5077476 (1991-12-01), Rosenthal
Diamyd Medical Aktiebolag
Hannaher Constantine
Israel Andrew
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