CS211109B1 - Nuclear magnetic resonance pulse spectrometer with standard computer interface - Google Patents

Abstract

The invention relates to a circuit for a pulsed NMR spectrometer analyzer, which is intended exclusively for this device. The essence of the circuit is that the NMR spectrometer is connected on the one hand to a first interface board via a control circuit and an analog-to-digital converter and on the other hand to a second interface board via a first and second digital-to-analog converter and via a digital output unit. The circuit allows for a reduction in manufacturing costs. The circuit is shown in the attached drawing.

Description

The invention relates to the connection of a nuclear magnetic resonance pulse spectrometer with a standard computer interface.

One part of the pulse spectrometer is the analyzer, which consists of a computer, interface and functional units. Each functional unit is connected to the two-way computer bus via a separate interface board. Overwriting data from the computer through the first interface board to the control circuit determines the filter setting, the analog-to-digital converter resolution, and the phase setting of the multiplexer. The COMMAND signal controls the writing of data on the functional unit to the memory and operation of the pulse generator.

The measured value of the nuclear magnetic resonance spectrometer signal is converted into a digital signal in an analogue to digital converter and is fed via an output unit to a second interface board, which is connected to a bi-directional computer bus. In addition, a third interface board is connected to this bus, which transcribes the information to the first digital-to-analog converter that controls the x-ray recorder and spectrometer display. The fourth interface board connected to the second D / A converter transcribes the y-axis information.

Transmission of digital information from the nuclear magnetic resonance spectrometer from the digital output unit is handled by the fifth interface board. The disadvantage of the current connection is the necessity of using five interface boards, which requires a larger amount of space in the computer's interface bath. Another disadvantage is the production costly and laborious cabling and, at the same time, more complicated adjustment and activation of the whole analyzer.

These previous drawbacks are eliminated by the connection of a nuclear magnetic resonance pulse spectrometer with a standard computer interface, which is based on the fact that the nuclear magnetic resonance spectrometer is connected to the first interface board via the control circuit and analog to digital converter. converter and digital output unit.

The main advantage of the wiring according to the invention over the previous wiring is saving more than half of the interface boards, saving space in the computer interface bath, easier and simpler cabling and faster and easier setup and activation of the whole analyzer.

The invention will be explained in more detail in the accompanying drawing, in which the connection of the analyzer with a spectrometer is shown in block. The analyzer consists of a computer 1 which is connected to a functional unit via a bidirectional bus 2, a first interface board J and a second interface board i. The functional unit consists of a control circuit 5 and an analog-to-digital converter 6 which are connected to the bidirectional bus 2 of the computer J. by means of a first interface board J, a first digital-to-analog converter 2, a second digital-to-analog converter 8 and digital output unit 2. All parts of the functional unit, i.e. the control circuit 2, the analog-to-digital converter 6, the first to the digital-to-analog converter 7, the second to the digital-to-analog converter 8 and the digital output unit 2 are connected individually. with a nuclear magnetic resonance spectrometer 10.

The first interface plate J serves both for controlling the sensing circuits and for transmitting the response from the nuclear magnetic resonance spectrometer 10 spin system. When the response is sensed from the spin system, the status word determining the scan mode is first transmitted through the first interface board 2. The COMMAND setting command determines the moment of writing the status word and at the same time its leading edge activates the nuclear magnetic resonance spectrometer 10. The sensing data converted by the analog-to-digital converter 6 utilizes the input circuits in the first interface board J.

The FLAG signal determines the moments of writing to the first interface board J while providing information to the computer J. The measured data from the analog-to-digital converter 6 forms the input for the first interface board J, the FLAG signal indicating the moment of measurement. The second interface board A serves to control both the digital-to-analog converters 2, 8 and to transmit digital information from the nuclear magnetic resonance spectrometer 10 to the computer 1. transmits the x coordinates defined by the twelve bits for that converter and one bit defining the x coordinate via the second interface plate 4 to the first D / A converter 2.

The moment of writing to the memory of the first digital-to-analog converter 2 is given by the command COMMAND. Then, the y coordinate, also defined by twelve bits and one bit defining the y coordinate, is transmitted to the second digital-to-analog converter J. The moment of this entry is also given by the command COMMAND. Irrespective of this, the computer 1 programmatically senses the state of the nuclear magnetic resonance spectrometer 10 via the digital output unit J and the second interface board 4 records them in the memories. On the basis of this information it decides on further activities. The FLAG signal in the second interface board 4 is not used in this operation.

Claims (1)

Connection of a nuclear magnetic resonance pulse spectrometer to a standard computer interface characterized in that the nuclear magnetic resonance spectrometer (10) is connected both to the first interface board (3) via the control circuit (5) and to the analog-to-digital converter (6) and 4) interface via the first and second digital-to-analogue converters (7 and 8) and the digital output unit (9).