SU890187A2 - Nuclear magnetic resonance device for neasuring concentration of paramagnetic substance in solution - Google Patents

Description

The invention relates to a meter; technology, and can be used to automatically measure the concentration of paramagnetic substances in solutions. According to the main author. St. N 662855 a nuclear magnetic resonance (NMR) device is known for measuring the concentration of paramagnetic substances in solutions, containing a permanent magnet, an NMR sensor, to the output of which a radio frequency receiver is connected, and to an input- modifying generator connected to a controlled generator 180-90- a pulse generator, connected in series by a stroboscopic integrator, a Differentiating amplifier to a null organ, the output of a null organ connected to the control input of a controlled generator of 180-90-degree pulses The boscopic integrator is connected to the output of the radio frequency receiver G1. The disadvantage of this device lies in the manual entry of portions of the solution with the test paramagnetic substance, which does not provide high speed and does not allow the device to be included in the APCS system to ensure the optimization of the technological process. The aim of the invention is to reduce the labor intensity and speed up the measurement process. The goal is achieved by the fact that a nuclear magnetic resonance device for measuring the concentration of paramagnetic substances in a solution, containing a permanent mapgit, NMR sensor, to the output of which a radio frequency receiver is connected, and to the input a modular generator, connected to a control unit with an 18O- generator. 9O-degree pulses connected in series by a stroboscopic integrator, a differentiating amplifier and a zero-organ, the output of a null-organ connected to the control input 389 of the controlled generator 180-90-. degree pulses, and the stroboscopic integrator input is connected to the output of the radio frequency receiver, two controllable valves, a pulse distributor and a pulse distributor start and stop unit are added, with two control valves connected to the input and output of the NMR sensor, the first output of the pulse distributor of regulators the input of the controlled generator 180-90 is -radius pulses, and the second and third inputs are with the inputs of the control valves of the magnetic resonance sensor, the outputs of the launcher and OS anovki pulse distributor are connected to the inputs of the pulse distributor, block start and stop pulses input distributor - a fourth vosodom distributor pulses. This broadens the field of application of the device, allows the fvicTBop under study to be fed into the NMR sensor at the required speed, including the pulsed delivery of measured portions of the solution with the specified stopping time for the measurement period (to completely eliminate dynamic mixing), while reducing labor input and speeding up the process measurement due to the automatic doziroblok-scheme. The drawing presents the ma of the proposed device. The device consists of a sensor 1 magnetic resonance in the field of a constant pin of the modulating generator 2, a controlled generator 3 180-90 degree pulses, a radio frequency receiver 4, a stroboscopic integrator 5, a differentiating amplifier 6, a zero-body 7, an information output device 8, a distributor pulses (RI) 9, control valve 10, through which the NMR sensor is filled with the test solution, control valve 11, through which it is discharged from the NMR sensor of the test solution, start and stop unit 12 and pulse distributor (BZORI) 12. The device operates as follows. After starting the distributor of signal impulses from block 12, its three outputs successively, at predetermined intervals of time, signals of a predetermined duration appear. The first signal appears at the output of the RS, connected to the controllable cl. 10, the valve U opens and the 74 NMR sensor is filled and disappears after. The signal inlet channel is automatically closed. A signal then appears at the output of the RI connected to the input of the control generator. In this case, the controlled generator of 180-90-degree pulses of 3 pulses produces a series of two pulses (180 and 90) with a variable time interval between them for measuring the relaxation time T by the zero method. From the output of the controlled oscillator, the pulses enter the modulating oscillator 2, which generates a probe radio pulses with a resonant frequency of filling of the solvent cores (NMR on hydrogen nuclei are observed). After a 90-degree pulse, a nuclear induction signal is detected, the magnitude of which depends on the time interval between the probing radio frequency pulses. Moreover, with the interval -0 0.693 T, the intensity of the nuclear induction signal is zero. For measurement, the nuclear induction signal is amplified by the receiver 4, which has a capacitive coupling to the modulating generator 2, is fed to the stroboscopic integrator 5. The stroboscopic integrator allows a periodically repeating signal envelope of the nuclear induction. The strobe pulses are generated by a controlled generator 3. From the code of the stroboscopic integrator 5, the voltage is applied to the differentiating amplifier 6. When measuring the time interval by the probing pulses from 0 to to, the derivative of the envelope has a negative value, and at t To is 0 and zero organ 7 it generates a pulse that stops further filling in the counter of the register of the address of the controlled pulse generator 3. Consequently, the code dialed in the counter of the register of the address corresponds to the value of Co, since the interval is formed in the controlled generator 3 by means of the address register. Knowing and, you can find the time T, which is inversely proportional to the Concentration of paramagnetic substances in solution. Thus, the code dialed in the counter of the address register in relative units contains information on the concentration of paramagnetic substances in the solution. The dialed code from the address register of the controlled oscillator 3 is fed to the digital display of the device 8 of the data output.

At the end of the operation, the measurement signal at the output of the PJ, connected to the controllable valve 10, disappears and a signal of a given magnitude and duration at the output of the pulse distributor appears, which opens the controllable valve 11 for the time required to completely remove the solution from the NMR sensor, then control valve 11 closes automatically. After that, the operation of the pulse distributor is terminated by a signal from block 12 to the appearance of the next Start command from the block. BZORI 12 at its entrance.

The use of the invention allows the automatic control of the composition of the analyzed solution and the use of Dannge analysis to control the process. At the same time, the elimination of human participation in the control of the composition of the technological solution improves labor productivity, increases the accuracy of the analysis by stopping the solution for a period of change (which eliminates dynamic error). In addition to TorOj, the elimination of the operator’s subjective errors eliminates the delay between the moment of analysis and the correction of the composition of the technological solution, which improves the quality of the technological process, simultaneously reducing the labor intensity and accelerating the measurement process, as well as allowing the device to be included in the automatic control system ensuring the optimization of technological

prodessa. Ultimately, the technical level of production of CEA of the 4th and 5th generations will significantly increase.

Invention Formula

Nuclear magnetic resonance device for measuring the concentration of paramagnetic substances in solution according to the author. St. No. 662855, characterized in that, in order to reduce the complexity of the measurement process, it additionally includes two control valves, a pulse distributor and a start and stop unit for the pulse distributor, and two control valves are included at the input and output dates

nuclear magnetic resonance, the first output of the pulse distributor is connected to the regulating input of a controlled generator of 180-90-degree pulses, and the second and third outputs - with

the inputs of the controlled valves of the magnetic resonance sensor, the outputs of the start and stop unit of the pulse distributor are connected to the inputs of the pulse distributor, the input of the block and stop of the pulse distributor are connected to the fourth output of the pulse distributor.

Sources of information, take into account when examining 1. USSR author's certificate

No. 662855, cl. Q O1 N 24 / -08, 1976.

Claims (1)

Claim * Nuclear magnetic resonance * ® device for measuring vapor concentration. magnetic substances in solution according to ed. St. No. 662855, characterized in that, in order to reduce the complexity and speed up the measurement process, two additional control valves, a pulse distributor and a start and stop unit for the pulse distributor are added to it ¹⁵ , two controlled valves included at the input and output of the nuclear magnetic resonance sensor first pulse distributor output connected with a control input of controlled oscillator 180-90-degree pulses, and the second and third outputs - to the control input ³⁵ of the magnetic resonance sensor valve vyho s block start and stop pulses from the pulse distributor connected to inputs of the distributor, start input unit and ostanov50 pulses ki distributor - to the fourth output of the pulse distributor.