SU1012114A1 - Substance state change registering method - Google Patents

Description

YU

and the invention relates to the field of using electron paramagnetic resonance (9PR) for research and analysis of materials, mainly for the development and control of technological processes in various areas of national economy. In modern studies and analysis of materials by magnetic resonance methods, the following tasks have to be solved: the study of changes in the physicochemical properties of materials after external influences, such as, for example, irradiation, temperature changes, etc., and the determination of the correlation dependence between the magnitude of the effect and the change in the parameters of the spectral line of the EPR signal; measuring the magnitude of the effect on the material from a known correlation dependence by measuring the magnitude of the change in the parameters of the spectral lines of the EPR signal. A known method for registering a change in the state of a substance by the EPR method consists in sequential recording. On one sheet of diagram paper of spectral curves, before and after someone has an effect on the material under study and in the subsequent measurement of a changing parameter of the spectrum on a chart paper with a measuring tool ( ruler, circulation, etc.) 11. The disadvantage of this method is the relatively long measurement time. The closest to the invention is the method of registering the change in the state of a substance by registering the change in the steepness of the first derivative of the electron paramagnetic resonance signal before and after the varying effect, 2, The disadvantage of this method is the measurement time. This is due to the fact that in order to measure the change in steepness of the first derivative of the EPR signal, it is necessary to record the measured spectral line completely and, after changing the effect, to re-record this spectral line. Thus, the measurement time can not be less than the time of two consecutive records of the measured; spectral line. The aim of the invention is to reduce the registration time. This goal is achieved by the fact that according to the method of registering a change in the state of a substance, by registering a change in the steepness of the first derivative of the electron paramagnetic resonance signal, before and after the changing effect stabilize the resonant conditions at the zero point of the first derivative of the electron paramagnetic resonance signal magnetic field and the electron paramagnetic resonance signal is measured. Fig. 1 shows a functional diagram of a device by which the proposed method for measuring the change in state of a substance can be realized; in figure 2.-time diagram of the measurement process. The device contains an EPR 1J spectrometer, a system for stabilizing resonant conditions 2, a command device 3, a block of calibrated perturbations of resonant conditions, a voltage meter Jj. The process of measuring the change of state of a substance is carried out as follows. Place the sample to be measured in a microwave resonator, which is placed in a polarizing magnetic field, and irradiate the sample with a microwave field. Then, the EPR spectrum of the sample being measured is scanned by scanning the value of the polarizing magnetic field, the first derivative of the absorption signal is measured, and the resonance conditions are stabilized at the zero point of the first derivative. Next, a calibrated change in the resonant conditions is introduced, for example, a calibrated voltage is introduced into the stabilization system of a polarizing magnetic field (see Fig. 2), and the voltage of the EPR signal, which appears at the output of the EPR spectrometer as a result of a calibrated change in the resonance conditions (see figure 2). After that, a disturbing effect on the measured one is carried out, and a new value of the EPR signal voltage is measured. As a result, a signal ratio is found that is proportional to the ratio of the values of the steepness of the first derivative, and according to it, a change is judged. The scientific research institute of amplitude or width of the signal of absorption caused by a change in the state of a substance under the influence of a disturbing effect. The technical and economic effect of the proposed method is technical and is determined by the fact that there is no need to sweep the EPR spectrum and measure the first derivative of the absorption signal.

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nor after exposure. measured sample of disturbing action. Since these operations usually take time from units to tens of minutes, the proposed one. This method allows one to significantly reduce the time taken to measure changes in the state of a substance and to ease the conditions for the removal of kinetic entrainments in EPR experiments.

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Claims (1)

: METHOD FOR REGISTRING CHANGES IN THE STATE OF A MATTER by registering a change in the first derivative of an electron paramagnetic resonance signal before and after a changing exposure, characterized in that, in order to reduce the recording time, the resonance conditions are stabilized at the zero point of the first derivative of the electron paramagnetic resonance signal, a calibrated change is made polarizing magnetic field and measure the signal of electron paramagnetic resonance.