SU811124A1 - Pulse-type nuclear magnetic resonance spectrometer - Google Patents

Description

The tank, the mass measurement unit, the computing device and the recording unit, contain a variable geometric sensor, an automatic feed unit and evacuation of an equivalent substance, a bulk sample metering and sample feed unit, a sample evacuation unit, an automatic control unit, a comparison unit and amplitude settings of echo signals, the relaxation time control unit, while the dosing and sample supplying unit is articulated by a pipeline with a sensor, in the center of which a variable geometric capacitance is set, the hydraulic connected with the automatic feed unit and evacuation of an equivalent substance, the input of which is connected to the output of the automatic control unit, the other outputs of which are connected to the sample dosing and supply unit, the sample evacuation unit, the mass meter, the software device, the comparison unit and the amplitude settings of the echo signals, the relaxation time control unit, the computing device, and the receiver outputs are connected to the computing device inputs, the comparison unit and the amplitude settings of the echo signals, the cone the role of relaxation time, which are interconnected; the output of the mass measurement unit — with the input of the computing device; and, in addition, through feedback, the automatic control unit is connected to the comparison and amplitude settings of the echo signals, the relaxation time control unit, the computing device and the registration unit .

After the sample of the medium under study enters the sensor, the variable geometric capacitance is filled with an equivalent substance until the measured value of the amplitude of the echo signal is obtained equal to the predetermined value on the comparison unit and the settings of the amplitudes of the echo signals.

The total value of the amplitudes of the echo signals contains the quantitative characteristic of the sample being measured and the equivalent substance, the relaxation time of which corresponds to the measured one. This makes it possible to significantly increase the amplitude of the echo signal, and therefore, to measure the components of the substances of the medium separately. Thus, measuring the amplitude of the echo signal of the sample medium and equivalent substance, and then removing the sample from the sensor, measuring the amplitude of the echo signal of the equivalent substance entered into the variable capacitance and, by simple calculations, we obtain the quantitative value of the substance and the qualitative value of the studied environment.

The drawing shows a block diagram of a pulse spectrometer.

The spectrometer contains a dosing and sample supply unit 1, connected by pipeline to sensor 2, evacuation unit 3 connected by pipeline to mass measurement unit 4 and sensor 2.

Sensor 2 is placed in the melapolar gap of the polarizing magnetic system 5. At the center of the sensor 2, a variable capacitance 6 is set, connected by a hydraulic channel to the automatic feed and evacuation unit 7 of the equivalent

substances. The electrical channel connects the software device 8, the output of which is connected to the input of the transmitter 9. Sensor 2 is connected to the output of the transmitter 9 and the input of the receiver 10. The outputs of the receiver 10

connected to the unit 11 of the comparison and the settings of the amplitudes of the echo signals, the block 12 controls the relaxation times and the computing device 13. In turn, the output of the block 12 is connected

with the input of the block 11, the outputs of which are connected to the inputs of the block 14 of automatic control. The outputs of block 14 are connected to the inputs of blocks 1, 3 and 4, software device 8, block 7 and computing device 13.

The outputs of the computing device 13 are connected to the inputs of the blocks 14 and 15, and the inputs to the outputs of the block 4 and the receiver 10. In turn, the recording unit 15 is feedback connected to the block 14 of automatic control.

The spectrometer works as follows.

Vlok dispensing 1 feeds sensor 2

sample of the medium of a given volume. From block 14, the enable signal is sent to send a series of probe pulses from software device 8 to transmitter 9, and from transmitter 9 to sensor 2. The amplitudes of the echo signals amplified by receiver 10 are fed to block I. When compared with the specified value of the echo amplitude The amplitude settings of the echo signal measured will be significantly less at the first moment. The signal about the difference of the amplitudes goes to the block 14, which starts the block 7, while the equivalent substance enters the variable capacitance 6 until the amplitude value is reached

the measured echo signal, the amplitude of the setpoint with a given accuracy on the block 11.

The incoming signals from receiver 10 measure the relaxation time of substances.

the influence of the relaxation times of other media at block 12; in the case of overlapping relaxation times

For two substances, the temporal reference point of the amplitude of the echo signals of the measured substance is shifted along the time axis to eliminate the influence of other substances. At the new reference point, the measured amplitude of the echo signal is compared with the setpoint

corresponding to the selected point on block 11.

When the value of the measured amplitude of the echo signal reaches the setpoint and the specified accuracy is reached, the signals from blocks 11 and 12 are sent to block 14, which sends a command signal to the computing device 13 to memorize the value of the measured echoes (or amplitude group).

Simultaneously, command signals are received from block 14. Block 3 and mass meter 4, where the sample medium moves from sensor 2 to mass receiving cell 4, the measured mass value is recorded by the computing device and the sample is reset.

The measured value of the mass is calculated by the computing device that sends a signal to the automatic control unit 14, which blocks the block 11 and block 12 and measures the amplitude of the echo signal in the same time sample of the equivalent substance entered into the variable geometric capacitance 6, which from the receiver 10 enters computing device 13.

When the amplitude (or amplitude group) of echo signals from the sample substance and equivalent substance, the amplitude (or amplitude group) of the echo signals of the equivalent substance, and the sample mass value arrive at the computing device 13, the amount of the measured substance is calculated.

The quality of a medium is defined as the ratio of the measured amount of a substance to the mass of a sample of a substance.

At the registration unit 15, digital printing of measurement results and calculations is performed, after which the unit receives a sigal at unit 14, and all units of the spectrometer are returned to their original initial state.

The spectrometer allows to increase the sensitivity and accuracy of measurements, the ability to determine small quantitative values of substances in a multi-component environment, as well as to increase the productivity of equipment and labor during the processing of raw materials; preserve the quality of raw materials during storage; to obtain a greater yield of the finished product due to the white completely separating it from the raw material.

Claims (2)

1. The prospectus of the company "Brukker" Pulsed MPR-spectrometers with variable frequency. 2. Pulsed NMR spectrometer XP 1/8. Broker Avenue of Germany (prototype).