Device for measuring light absorption characteristics of a biological tissue sample
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Abstract
The invention concerns a device comprising means (7) for illuminating the sample (1), designed to alternately emit first and second radiation beams; means (9) for receiving and analyzing the radiation derived from the sample (1) which include means for converting (23) the output radiation into control signal (S0); monitoring and controlling means (31) emitting first (S1) and second (S2) signals controlling the illuminating means (7), and a measuring signal (Sm); and means for calculating the absorption characteristics of the sample (1), on the basis of said measuring signal (Sm). Said monitoring and control means (31) are adapted so that, after an integration time interval (Ti) of at least one period (Tp) of variation of said radiation beams, the amplitude of said control signal (S0), sensed on the emitting phases of one of the radiation beams, is equal to the amplitude of the control signal (S0), sensed on the emission phases of the other radiation, and the measuring signal (Sm) represents at least one of said control signals (S1, S2).
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Citations
52 Claims
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1. - 21. (cancelled)
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22. Device for measuring light absorption characteristics of a biological tissue sample comprising:
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means for illumination (7;
307) of the sample (1) adapted to emit alternately at least one first and one second light radiation beam towards the sample, the said radiation beams having respectively a first and a second wavelength which are different from one another;
means (9) for reception and analysis of the output light radiation emitted by the sample (1), the said reception and analysis means (9) comprising means (23) for converting the said output radiation into a control signal (S0);
monitoring and control means (31;
331) which receive the monitoring signal (S0) as input and emit at the output at least the first (S1) and the second (S2) signals for controlling the illuminating means (7;
307), corresponding to the first and second radiation beams respectively, and at least one measurement signal (Sm); and
means (33) for computing the absorption characteristics of the sample (1) which are adapted to receive the said measurement signal (Sm) as input and to compute the said characteristics as a function of the said measurement signal (Sm), characterised in that the said monitoring and control means (31;
331) are adapted so that the light intensity (IUV, IR) of each of the radiation beams varies in a periodic manner, phase-shifted with respect to one another, and so as to regulate at least one of the control signals (S1, S2) as a function of the monitoring signal (S0) in such a way that, over an integration time period (Ti) of at least one period (Tp) of variation of the said radiation beams, the amplitude of the said monitoring signal (S0) taken over the emission phases of one of the radiation beams is equal to the amplitude of the monitoring signal (S0) taken over the emission phases of the other radiation beam,and in that the measurement signal (Sm) represents at least one of the said control signals (S1, S2) over the integration time period (Ti) - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. Method of measuring the light absorption characteristics of a biological tissue sample, in which the following operations are carried out:
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the sample (1) is illuminated by illumination means (7;
307) alternately by first and second radiation beams of different wavelengths and periodic intensities (IUV, IR);
the radiation emitted by the sample (1) is detected and the said radiation is analysed;
the said illumination means (7;
307) are controlled as a function of the said detected radiation,characterised in that the said control is carried out in the following manner;
the intensity of the first and second radiation beams (IUV, IR) is regulated such that, over an integration time period (Ti) of at least one period (Tp) of variation of the said radiation beams, the intensity (IF) of the output radiation taken over the emission phases of one of the first and second radiation beams is equal to the intensity (IF) of the output radiation taken over the emission phases of the other one of the first and second radiation beams; and
the light absorption characteristics of the sample are calculated as a function of the desired intensity of one (IR) of the said first and second radiation beams taken over a measurement time interval (Tm). - View Dependent Claims (47, 48, 49, 50, 51, 52)
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Specification