• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SU713543A3
    申请号:SU742015754
    申请日:1974-04-11
    公开日:1980-01-30
    发明作者:Томлинсон Барреттлинн；Дэвид Вильсон Хилл Говард
    申请人:Вариан Ассошиэйтс (Фирма)；
    IPC主号:
    专利说明:

    (54) RADIO FREQUENCY SPECTROMETER
    I2
    il 14, pseudo-random sequence generator 15 and phase shifter 16.
    Phaser works as follows obasoi.
    By applying an RF field with a magneto-field component perpendicular to the optical fiber of the polarizing Yao magnetic field vector (the source of the magnetic field HQ in the imp is not shown) in the test sample, the gyromagnetic resonance is excited by the radio frequency coil.
    The radio frequency field is created by modulating in the modulator 2. a radio frequency carrier signal which is supplied from the generator /. When modulating the radio frequency carrier, sidebands are formed.
    L1.0Aliru Osh function F (t) is chosen in such a way that the sideband energy has the desired, depending on the sample to be investigated, the energy spectral density for one or the other to excite the resonance of a plurality of spectral lines of the sample.
    A typical example of one type of energy spectrum for resonant excitation energy is the spectral signal shown in FIG. 2, a. In particular, in this signal, the radio frequency excitation spectrum is usually homogeneous: the spectral density is on a relatively wide band in the order of 1000 Hz on one side of the carrier frequency, on the order of 60-100 MHz with the exception of (m relatively narrow portion of the spectrum, on KOTOpoiM excitation Resonance is undesirable. This narrow part of the spectrum may contain a particularly intense spectral line of the sample, for example, such as the dissolution line, the resonance of which is desirable to suppress.
    Accordingly, the electronic computer 5 is provided with the desired resonant excitation spectrum in the frequency domain. Excitation data: spectrum can be input to the end-of-device input or edited by reading from the digital input device (teletype, teletype, typewriter), or the data can be calculated or edited automatically from data already stored in the computer.
    For coherent phase wideband excitation, data is transformed by computational matrices into the time domain by means of a standard discrete Fourier transform program. A typical function of the modulation output F (t) to obtain the energy density of the spectrum (Fig. 2, a) is shown in Fig. 2.6 and is essentially a short duration pulse with a relatively long duration of time interval.
    In the pre-read mode, the modulator pulse 2 modulates the carrier signal
    a series of impulses with a repetition rate of 1/500 MKS (the interval between pulses is 500 µs) and the pulse width is approximately equal to 1/10, and the interval between pulses is in the order of 50 µs. The pulse height or its width is modulated according to the modulation output G (/).
    Since the values of G (/) can have both positive and negative signs, a gate phase inverter / J is installed at the output of the modulator 2 to change the sign (rotation) of the energy of the modulated non-jittering frequency, which is supplied to the probe 3, B according to the sign of the module component F (t).
    The interrelation of radiofrequency energy from the generator to the receiving part of the spectrometer at frequencies other than resonant is eliminated by turning on the valve 14 between the probe 3 and the amplifier
    5 4 radio frequency signals perceived by the standard receiver coil of probe 3. Ventpl 14 is synchronized with the help of a digital computer 8 with an oscillator time (for the liver) for time separation (Fig. 2 v, the signal from the output of the radio frequency amplifier 4 is fed to one the input of the phase detector 5 for detecting the phase depending on the reference phase signal,
    5 received through the phase shifter 16 from the generator. The output signal of the phase detector 5 is a complex resonant audio frequency signal, consisting of signals simultaneously excited
    0 resonance spectral lines emerging from the analyzed sample. The composite resonant audio signal is amplified in the sound amplifier 6, and from there it is fed to the analog-digital signal.
    5 to the converter 7, which selects a composite resonant signal once for each transmitter pulse, at the end of the period during which the receiver 17 is opened in FIG. 2, (E.
    50 A composite resonant signal is selected at the end of the period of operation of the receiver 17 in order to suppress unwanted transients associated with the receiver.
    权利要求:
    Claims (1)
    [1]
    55 Digital instantaneous values of the signal from the output of the analog-digital converter 7 are stored in the serial channels of the multichannel memory block 9 of the electronic computer 8 for 60 averaging over the times of the resonant signal. The sequence of the selected instantaneous values of the signal is synchronized with the moments of reading from the modulation output of the electronic computer 6 of the machine 8 used to generate a wide-band radio frequency excitation / (co). The sequence of selected instantaneous values of the signal is repeated every time the modulation output sequence F (t) is repeated. The time-averaged resonance data is then read from memory block 9 and converted using an electronic computer 8, as programmed by the standard Fourier transform program of block 10, to convert the time-domain data, the field f (t) into the frequency domain /; " ) to obtain the resonance spectrum of the sample under investigation. The time-averaged resonance spectrum of the sample is then supplied to a block / 8 reproduced to be shown to the operator and / or recorded. To improve the accuracy of the phase of the desired radio frequency excitation, they are mixed in accordance with the pseudo-random sequence, which is entered using the pseudo-random sequence generator 15 via key 19. Invention The radio frequency spectrometer, a secondary generator connected through a modulator with a probe for placing the sample under investigation The radio frequency amplifier, the phase detector, the audio amplifier and the aerial-digital converter, the output of which Connected to the input of an electronic computer that contains an input memory block and a Fourier transform unit from the time domain to the frequency domain, so that, in order to improve the measurement accuracy, an engraving unit is introduced, the inputs of which are respectively connected to a memory unit, a Fourier transform unit from the time domain to the frequency domain, and an inserted Fourier transform unit from the frequency domain to the time domain, and the output is connected to the control input of the modulator. A stoker of information taken into account in the examination: 1. US Patent jYg 3475680, cl. G 01 R 27/28, onlib. 1969 (prototype).
    4 ttr
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    同族专利:
    公开号 | 公开日
    FR2225746B1|1978-03-24|
    JPS509493A|1975-01-30|
    SE406981B|1979-03-05|
    IT1009807B|1976-12-20|
    NL7405065A|1974-10-15|
    AU6778174A|1975-10-16|
    FR2225746A1|1974-11-08|
    CA998741A|1976-10-19|
    CH586905A5|1977-04-15|
    DE2414551A1|1974-10-31|
    DE2414551C2|1982-12-09|
    JPS6160374B2|1986-12-20|
    GB1448939A|1976-09-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3609317A|1970-01-29|1971-09-28|Varian Associates|Variable frequency audio frequency modulator for r.f. spectrometer|
    DE2058447C3|1970-11-27|1974-04-11|Spectrospin Ag, Zuerich |Method and device for the excitation of spin resonances|US4065714A|1976-06-21|1977-12-27|Varian Associates, Inc.|Pulsed RF excited spectrometer having improved pulse width control|
    JPH053104B2|1983-07-20|1993-01-14|Sony Corp|
    JPS61233939A|1985-04-10|1986-10-18|Matsushita Electric Ind Co Ltd|Deflecting coil device|
    GB9112290D0|1991-06-07|1991-07-24|Nat Res Dev|Methods and apparatus for nqr imaging|
    GB9319875D0|1993-09-27|1994-03-09|British Tech Group|Apparatus for and methods of nuclear resonance testing|
    EP0788608B1|1994-09-29|2000-10-25|Btg International Limited|Nuclear quadrupole resonance testing|
    EP2893332A4|2012-10-04|2015-07-29|Halliburton Energy Services Inc|Frequency location apparatus, methods, and systems|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US35045773A| true| 1973-04-12|1973-04-12|
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