Method and an automatic device for analyzing variations in the transparency of a sample
First Claim
1. A method for analyzing the time of useful variaton in transparency of a sample in which the end of the useful period of said variations is characterized by a variation in slope of the curve which is representative of said transparency as a function of time, wherein said method consists in generating an electrical signal B which is representative of the time-dependent variations of said transparency, in generating a pulse at the initial instant of measurement, in carrying out an initial measurement of the slope of the curve at the beginning of the portion which has a steep slope, in comparing at predetermined instants the measured value of said initial slope with the slope of the curve which is representative of the signal B at said instants, in generating a second pulse when the measured slope becomes significantly different from the initial slope, and in measuring the time interval which elapses between the first and second pulses.
0 Assignments
0 Petitions
Accused Products
Abstract
The method consists in generating an electrical signal B which is representative of the time-dependent variations in transparency, in generating a pulse at the initial instant of measurement, in carrying out an initial measurement of the slope of the curve at the beginning of the portion which has a steep slope, in comparing at predetermined instants the measured value of the initial slope with the slope of the curve which is representative of the signal B at these instants, in generating a second pulse when the measured slope becomes significantly different from the initial slope, and in measuring the time interval which elapses between the first and second pulses.
17 Citations
11 Claims
- 1. A method for analyzing the time of useful variaton in transparency of a sample in which the end of the useful period of said variations is characterized by a variation in slope of the curve which is representative of said transparency as a function of time, wherein said method consists in generating an electrical signal B which is representative of the time-dependent variations of said transparency, in generating a pulse at the initial instant of measurement, in carrying out an initial measurement of the slope of the curve at the beginning of the portion which has a steep slope, in comparing at predetermined instants the measured value of said initial slope with the slope of the curve which is representative of the signal B at said instants, in generating a second pulse when the measured slope becomes significantly different from the initial slope, and in measuring the time interval which elapses between the first and second pulses.
- 5. A device for analyzing time-dependent variations in transparency of a sample in which said variations have a high-slope region followed by a low-slope region, wherein said device comprises means for generating a first signal B which is representative of the time-dependent variations of said transparency, means for generating a second signal A which is variable in time from an initial instant t0, means for generating a first pulse at the initial instant t0, means for generating the signal A, said means being provided with means for making said signal representative of the initial slope of the signal B at the beginning of its high-slope region, means for periodically comparing said slope with the slope of the signal B, means for generating a second pulse when the slope of the signal B becomes higher than the initial slope measured, and means for measuring the time interval which elapses between the first and the second pulses.
Specification