CN201540363U - 1H/19F channel preamplifier of high-field nuclear magnetic resonance spectrometer - Google Patents
1H/19F channel preamplifier of high-field nuclear magnetic resonance spectrometer Download PDFInfo
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- CN201540363U CN201540363U CN2009201812294U CN200920181229U CN201540363U CN 201540363 U CN201540363 U CN 201540363U CN 2009201812294 U CN2009201812294 U CN 2009201812294U CN 200920181229 U CN200920181229 U CN 200920181229U CN 201540363 U CN201540363 U CN 201540363U
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Abstract
The utility model discloses a 1H/19F channel preamplifier of a high-field nuclear magnetic resonance spectrometer, relates to the preamplifier of the nuclear magnetic resonance spectrometer and provides the 1H/19F channel preamplifier of the high-field nuclear magnetic resonance spectrometer with simple structure, low noise figure, high in-band gain flatness, large amplification linear range, fast transmitting/receiving switching speed of a radio frequency switch, high cut-off isolation degree, accurate and sensitive working state detection function and good stability. The 1H/19F channel preamplifier of the high-field nuclear magnetic resonance spectrometer is provided with a radio frequency switch circuit, a control circuit of the radio frequency switch, a front-end matching circuit, an amplification front-end protection circuit, an amplification circuit, an output matching network, a working state detection circuit and a direct current bias circuit. The 1H/19F channel preamplifier of the high-field nuclear magnetic resonance spectrometer can meet the requirements on high performance of signal detection and amplification of a 1H/19F channel of the modern high-field nuclear magnetic resonance spectrometer, adjust the values of basic elements like a capacitor, an inductor and the like in the circuits, realize the different working frequency bandwidths, and meet the specific needs of a resonance frequency high-field spectrometer.
Description
Technical field
The utility model relates to a kind of nuclear magnetic resonance spectrometer prime amplifier, especially relates to a kind of high-field nuclear magnetic resonance spectrometer that is applied to
1H/
19The prime amplifier of F passage high sensitivity and high stability.Can be applicable to 300～600MHz high-field nuclear magnetic resonance spectrometer.
Background technology
Prime amplifier is the important component part of nuclear magnetic resonance spectrometer Transmit Receive Unit, is positioned at system foremost.At the signal reception period, the free induction decay signal from probe is carried out low noise amplify, send the next stage parts of system's receiving cable to; During the radio-frequency pulse emission,, give probe coil with high power pulse as the front end of transmission channel.The noiseproof feature of prime amplifier has conclusive effect to the noiseproof feature of whole receiver, directly has influence on spectrometer and finally tests sensitivity index, therefore requires prime amplifier to have high-performance.Have only the μ V order of magnitude from the coil-induced signal that goes out of receiving transducer, this just requires prime amplifier that suitable enlargement factor should be arranged, and very low noise figure is arranged again.The high performance requirements of prime amplifier mainly shows: 1. during spectrometer is in emission state, pulse train is through the radio-frequency (RF) switch and the front end match circuit of prime amplifier, the insertion loss of circuit will influence the radio-frequency power of excited atom nuclear resounce, thereby influence the size of the free induction decay signal of institute's excimer daughter nucleus; 2. during spectrometer is in accepting state, free induction decay signal is through front end match circuit, amplification front-end protection circuit and low noise amplifier circuit, deliver to the next stage parts of system, front end match circuit and the insertion loss of amplifying the front-end protection circuit, and the noise figure of low noise amplifier circuit is with the detection sensitivity of final decision prime amplifier; 3. the height of radio-frequency switch circuit will reduce firing frequency leakage interference to received signal by isolation; 4. high performance amplification front-end protection circuit will protect amplifying circuit to leak the influence of pair amplifier owing to high power RF during launching; Since from the coil-induced signal intensity that goes out of receiving transducer usually from several microvolts to the hundreds of microvolt, therefore require amplifying circuit to have the reliable range of linearity; 6. radio-frequency switch circuit should have and receives and dispatches switch speed fast, and prime amplifier is in accepting state fully when guaranteeing to receive.
At present, external high-field nuclear magnetic resonance spectrometer 1H/19F passage prime amplifier as a whole the vitals of system highly sensitive signal amplifying function is provided.
Prime amplifier parts in the external high field super pulse type NMR spectroscope all have self-character on project organization or the function, weak point is also arranged.High-field nuclear magnetic resonance spectrometer 1H/19F passage prime amplifier with U.S. Varian company and German Bruker company is the example explanation.The open source informations such as user manual that this two company offers show, the high-field nuclear magnetic resonance spectrometer 1H/19F passage prime amplifier of Varian company is simple for structure, but there are not duty indication and measuring ability, can't judge the duty of prime amplifier when therefore spectrometer is worked, and the power gain in the band is also smooth inadequately; And the high-field nuclear magnetic resonance spectrometer 1H/19F passage prime amplifier structure of German Bruker company is comparatively complicated; special complex structure on quatrter-wavelength line that amplifies the front-end protection circuit and state detection circuit; not only may introduce unnecessary interference; and can increase insertion loss and fault error rate, thereby influenced the resistance to overturning of system.
On the other hand, the nuclear magnetic resonance apparatus prime amplifier that external report or open source literature and patent are mentioned all only relates to amplifier section, and does not comprise high power RF transmit-receive switch, amplification front end high power RF protection part and front-end filtering part.For example U.S. Pat 7123090B2 and US5545999 only are the unique design of the low noise amplifier circuit under the spectrometer accepting state, and their prime amplifier does not contain high power RF transmit-receive switch circuit, amplifies front end high power RF holding circuit and front-end filtering circuit.C Huan, (C Huan such as S.S., S.S.Kim, L.Phelps, J.S.Xia, D.Candela and N.S.Sullivan.ANovel Design of a Low Temperature Preamplifier for Pulsed NMR Experiments of Dilute 3He inSolid 4He.Journal of Low Temperature Physics, Published online:1 October 2009) designed prime amplifier also only is a small signal amplification circuit.
Summary of the invention
The purpose of this utility model be to provide a kind of simple for structure, noise figure is low, gain flatness height in the band, amplify that the range of linearity is big, radio-frequency (RF) switch transmitting-receiving switch speed is fast, the high-field nuclear magnetic resonance spectrometer of, good stability accurately sensitive by isolation height, duty measuring ability
1H/
19F passage prime amplifier.
The utility model is provided with radio-frequency switch circuit, radio-frequency (RF) switch control circuit, front end match circuit, amplifies front-end protection circuit, amplifying circuit, output matching network, Working state checking circuit and dc bias circuit.
The radio-frequency pulse input port P3 of the external high-field nuclear magnetic resonance spectrometer of radio-frequency switch circuit input end, radio-frequency switch circuit output termination is amplified the front-end protection circuit input end; The external high-field nuclear magnetic resonance spectrometer of front end match circuit input end
1H nuclear and
19The input of F nuclear free induction decay signal, front end match circuit output termination is amplified the front-end protection circuit input end, and radio-frequency (RF) switch control circuit input end and Working state checking circuit input end be external radio-frequency (RF) switch control level input port respectively; Radio-frequency (RF) switch control circuit output terminal connects radio-frequency switch circuit respectively and amplifies the front-end protection circuit, amplifies the front-end protection circuit output end and connects input amplifier, and amplification circuit output end connects the output matching network input end, after output matching network output is amplified
1H nuclear and
19F nuclear free induction decay signal, Working state checking circuit and dc bias circuit connect feed circuit respectively.
Radio-frequency switch circuit is made up of the two-stage series connection PIN diode, when spectrometer is in emission state, and the radio-frequency switch circuit conducting, radio-frequency pulse is delivered to probe by this on-off circuit, and when spectrometer was in accepting state, radio-frequency switch circuit ended.
The radio-frequency (RF) switch control circuit is made up of resistor network, by the conducting current value of change resistance value adjustable radio-frequency switch P IN diode, thus the switch speed of change radio-frequency (RF) switch conducting degree and conduction and cut-off.The ON-OFF control circuit control signal is given by external TTL switch level.
Amplifying circuit is made up of two-stage amplifier, and wherein the first order adopts low noise enhancement mode Pseudomorphic High ElectronMobility Transistor, and silicon twin-stage Darlington amplifier tube is adopted in the second level.When spectrometer was in accepting state, this amplifying circuit was used to amplify the free induction decay signal from probe.
The front end matching network is made of the oval high-pass filtering circuit in seven rank, places the front end of this prime amplifier, link to each other with the probe port, and be the public passage that receives and launch, the input and output impedance matching is 50 Ω, plays the effect of Hi-pass filter simultaneously.
Amplify the front-end protection circuit, when being used for emission state, the protection amplifying circuit.Utilize that its input impedance was infinitely-great characteristic when 1/4 wavelength line connect load short circuits under the perfect condition, for reliable protection amplifying circuit more, adopted the three-level protective structure simultaneously.
Output matching network is made up of electric capacity and inductance network, realizes that the output impedance coupling is at 50 Ω.
The large-signal high power circuit that radio-frequency switch circuit, radio-frequency (RF) switch control circuit and front end match circuit are formed; amplify the small-signal low noise circuit that front-end protection circuit, amplifying circuit and output matching network are formed; Working state checking circuit 3 partial circuits are loaded on respectively in the shielding box, isolate mutually.
Because the utility model is provided with large-signal high power circuit, small-signal low noise circuit and Working state checking circuit, radio-frequency switch circuit, radio-frequency (RF) switch control circuit and front end match circuit are formed the large-signal high power circuit, amplify front-end protection circuit, amplifying circuit and output matching network and form the small-signal low noise circuit; And large-signal high power circuit, small-signal low noise circuit and Working state checking circuit be loaded on respectively in the shielding box, isolates mutually, avoids interference.When system is in emission state, send to probe again behind radio-frequency pulse process radio-frequency switch circuit that power amplifier is sent here and the front end matching network.When system is in accepting state, pop one's head in behind detected free induction decay signal process front end matching network, amplification front-end protection circuit, amplifying circuit and the output matching network, send to the next stage parts.
Radio-frequency switch circuit can adopt the two-stage series connection PIN diode, and first order PIN diode LC resonant network in parallel improves and is with interior isolation when radio-frequency (RF) switch is ended; Amplifier section adopts the two-stage structure for amplifying, and wherein the first order adopts high dynamic range, low noise enhancement mode Pseudomorphic High Electron Mobility Transistor, and silicon twin-stage Darlington amplifier tube is adopted in the second level; Amplify the front-end protection circuit and adopt three grades of PIN diode structures in parallel; Working state checking circuit adopts the reversal detection architecture, shows by LED, and different malfunction resistance ratios is set, and can reflect the duty and the failure condition of prime amplifier accurately and reliably.
This shows, the utility model can obtain following useful effect: have noise figure low, amplify that the range of linearity is big, radio-frequency (RF) switch transmitting-receiving switch speed is fast, gain flatness height in, the band accurately sensitive, good stability, advantage such as simple for structure by isolation height, duty measuring ability, can satisfy modern high-field nuclear magnetic resonance spectrometer
1H/
19The high performance requirements that the F channel signal detect to amplify, and adjust the value of primary elements such as capacitor and inductor in the circuit, realize different operational frequency bandwidth, satisfy the needs of concrete resonant frequency High-Field spectrometer.
The related nuclear magnetic resonance apparatus prime amplifier of the utility model not only comprises small signal amplification circuit; also comprise the high power RF transmit-receive switch, amplify front end high power RF holding circuit and front-end filtering circuit etc., these parts also have fundamental influence to the sensitivity of detection signal.Therefore external report or disclosed document and the related nuclear magnetic resonance apparatus prime amplifier of patent structurally differ greatly with the utility model, and function also has very big difference.
Description of drawings
Fig. 1 is an one-piece construction circuit of the present utility model.
Fig. 2 is the radio-frequency switch circuit circuit diagram.
Fig. 3 is front end matching network circuit figure.
Fig. 4 is for amplifying the front-end protection circuit diagram.
Fig. 5 is radio-frequency (RF) switch control circuit figure.
Fig. 6 is the low noise amplifier circuit circuit diagram.
Fig. 7 is the Working state checking circuit circuit diagram.
Fig. 8 is the stability factor simulation result figure of the utility model integrated circuit accepting state.In Fig. 8, horizontal ordinate is frequency (MHz), and ordinate is a stability factor.
Fig. 9 is the noise figure simulation result figure of the utility model integrated circuit accepting state.In Fig. 9, horizontal ordinate is frequency (MHz), and ordinate is noise figure (dB).
Figure 10 is the power gain simulation result figure of the utility model integrated circuit accepting state.In Figure 10, horizontal ordinate is frequency (GHz), and ordinate is power gain (dB).
Figure 11 is the output standing wave simulation result figure of the utility model integrated circuit accepting state.In Figure 11, horizontal ordinate is frequency (MHz), and ordinate is the output standing wave.
Figure 12 is the transport property simulation result figure of the P3 port of the utility model integrated circuit accepting state to the P1 port.In Figure 12, horizontal ordinate is frequency (MHz), and ordinate is the transport property (dB) of P3 port to the P1 port.
Figure 13 is the transport property simulation result figure of the P3 port of the utility model integrated circuit emission state to the P1 port.In Figure 13, horizontal ordinate is frequency (MHz), and ordinate is the transport property (dB) of P3 port to the P1 port.
Figure 14 is the output and the input standing wave simulation result figure of the utility model integrated circuit emission state.In Figure 14, horizontal ordinate is frequency (MHz), and ordinate is input, output standing wave.
Figure 15 is the transport property simulation result figure of the P3 port of the utility model integrated circuit emission state to the P2 port.In Figure 15, horizontal ordinate is frequency (MHz), and ordinate is the transport property (dB) of P3 port to the P2 port.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail:
As shown in Figure 1, high-field nuclear magnetic resonance spectrometer described in the utility model
1H/
19F passage prime amplifier comprises large-signal high power circuit plate, small-signal low noise circuit and Working state checking circuit.The large-signal high power circuit comprises radio-frequency switch circuit 1, radio-frequency (RF) switch control circuit 2 and front end matching network 3, and the small-signal low noise circuit comprises amplification front-end protection circuit 4, low noise amplifier circuit 5 and output matching network 6.Radio-frequency (RF) switch control circuit 2 is made up of resistor network.Three partial circuits are loaded on respectively in three shielding cavities of shielding box, isolate mutually, avoid interference.Shielding box has 5 ports, and when system was in emission state, the radio-frequency pulse that power amplifier is sent here imported prime amplifier into by the P3 port, is sent to probe by the P1 port through radio-frequency switch circuit 1 and front end matching network 2 backs.When system is in accepting state; the detected free induction decay signal of popping one's head in is sent into prime amplifier by the P1 port; behind front end matching network 3, amplification front-end protection circuit 4, low noise amplifier circuit 5 and output matching network 6, send to the next stage parts by the P2 port.The Transistor-Transistor Logic level signal of radio-frequency (RF) switch control circuit 2 is by the input of J1 port, and the power supply of the power supply of dc bias circuit 7 and Working state checking circuit 8 is imported by the J2 port.
The two-stage PIN diode is a tandem-type connection among Fig. 2, and PIN diode is selected high power PIN switching diode for use.When 3A and 4A end for positive level (as:+4.5V～+ 5V) time, PIN1 and PIN2 conducting, this moment, the radio-frequency pulse of P1 port was delivered to next stage by radio-frequency switch circuit from the 1A end.By adjusting resistance R 1, R2 and R4 among Fig. 5, can change the electric current of flow through PIN1 and PIN2, thereby adjust the conducting degree and the conduction and cut-off speed of PIN on-off circuit.3A and 4A end for negative level (as: 10V～-15V) time, diode ends, signal can not pass through this passage, L5, C3 constitute resonant network, PIN by the time formation high impedance, the interior isolation of the band when having improved the radio-frequency (RF) switch cut-off state.
What adopt among Fig. 3 is 7 rank elliptic filters, realizes 50 Ω impedance matching networks, forms bandpass filter simultaneously, suppresses low-frequency disturbance, eliminates the part higher hamonic wave.
Among Fig. 4, T1, T2 are two 1/4 wavelength coaxial cables, and PIN diode is a parallel connection method.When 6A, 7A and 8A end for positive level (as:+4.5V～+ 5V) time; PIN3, CR1, CR2, CR3 and CR4 conducting; C11, C13, C14, C16 and C17 form high frequency earthing; constitute three grades of PIN diode holding circuits in parallel; see the impedance infinity of holding circuit this moment at the 1C end; form the high frequency off state, the high power RF signal can't pass through holding circuit.When 6A, 7A and 8A end for negative level (as: 10V～-15V) time; PIN3, CR1, CR2, CR3 and CR4 end; amplifying the front-end protection circuit is the normal signal passage, and the passage loss is minimum, and the free induction decay signal of being sent here by probe can be smoothly by amplifying the front-end protection circuit.Resistance R 3, R5 and R6 can change the electric current of the PIN3 that flows through, CR1, CR2, CR3 and CR4 among same adjustment Fig. 5, thereby adjust the conducting degree and the conduction and cut-off speed of circuit.The effective reliable protection of three-level protective structure back level low noise amplifier circuit.
Adopt the two-stage structure for amplifying in Fig. 6 low noise amplifier circuit, the first order adopts high dynamic range, low noise enhancement mode Pseudomorphic High Electron Mobility Transistor, as: the ATF54143 of Agilent company, noise figure can reach 0.25dB in its 200MHz～1GHz scope, have higher dynamic range, and at high-field nuclear magnetic resonance spectrometer
1H/
19In the desired frequency bandwidth of F passage, this amplifier tube has good gain flatness.Silicon twin-stage Darlington amplifier tube is adopted in the second level, ADA4743 as Agilent company, operating circuit simply is easy to use, and the linearity and gain flatness all can satisfy the design needs, and can constitute good interstage matched and rock-steady structure with first amplifier valve.
Fig. 7 is a Working state checking circuit, and wherein the function of U4 is for detecting negative current.Under the accepting state, if radio-frequency (RF) switch is working properly, the electric current that then flows through the R15 two ends is zero, and U4 is output as zero, compares with reference voltage by voltage comparator U8, and this moment, the output voltage of U8 was zero, but bright by driving LED green light behind the phase inverter U6; If the radio-frequency (RF) switch operation irregularity, promptly the electric current that passes through the R15 two ends is more than or equal to 5mA, and then the output of U4 is compared with reference voltage by voltage comparator U8 more than or equal to 1.3V, and this moment, the output voltage of U8 was a high level, but the driving LED red light is bright.The output voltage of setting U7 by the resistance that R13 and two resistance of R14 are set is 1.3V, i.e. the reference voltage of U8.The function of U6 is utilized five current comparators of its inside for detecting positive current, is provided with the two-way load detecting, and R13 and R15 are the current sense resistor of this two-way load.When the electric current that flows through R13 and R15 was in setting range, the output voltage of U6 was zero, but this moment is bright by driving LED green light behind the phase inverter U6, on the contrary, went beyond the scope if detect electric current, and then the output voltage of U6 is 11V, but the driving LED red light is bright.Two ports of 10A and 11A connect the two-way load that needs detection respectively, and promptly amplification module and switch module detect the duty of this two-way with this.
Utilize ADS software to high-field nuclear magnetic resonance spectrometer of the present utility model
1H/
19F passage prime amplifier integrated circuit carries out emulation.With the 500MHz nuclear magnetic resonance spectrometer is example, and bandwidth of operation 100MHz, simulation result are shown in Fig. 8～15, and the main process of emulation is as follows:
1) stability of receiving cable circuit, noise figure and S parameters simulation analysis result show: by optimizing, realized noise figure＜0.7dB (pure circuit noise coefficient is not considered junction loss), stability factor K＞1, output standing-wave ratio (SWR)＜1.5, gain＞35dB in the band, end isolation＞55dB in the gain flatness＜1.5dB in the band, radio-frequency (RF) switch band.
2) the S parameters simulation analysis result of transmission channel circuit shows: by optimizing, realized that the 500MHz Frequency point inserts loss＜0.5dB, protection isolation＞70dB in the front end band is amplified in input and output standing-wave ratio (SWR)＜1.5.
Of the present utility model
1H/
19F passage preamplifier circuit main performance measured result is:
The measured result of receiving cable circuit: realize in-band noise coefficient＜1.0dB, output standing-wave ratio (SWR)＜1.5, gain＞35dB in the band, by isolation＞50dB, circuit working is stablized no self-sustained oscillation in the gain flatness＜1.5dB in the band, radio-frequency (RF) switch band.
The measured result of transmission channel circuit: realized that it is 0.5dB that the 500MHz Frequency point inserts loss, protection isolation＞55dB in the front end band is amplified in input and output standing-wave ratio (SWR)＜1.5.
Claims (8)
1. high-field nuclear magnetic resonance spectrometer
1H/
19F passage prime amplifier is characterized in that being provided with radio-frequency switch circuit, radio-frequency (RF) switch control circuit, front end match circuit, amplifies front-end protection circuit, amplifying circuit, output matching network, Working state checking circuit and dc bias circuit;
The radio-frequency pulse input port P3 of the external high-field nuclear magnetic resonance spectrometer of radio-frequency switch circuit input end, radio-frequency switch circuit output termination is amplified the front-end protection circuit input end; The external high-field nuclear magnetic resonance spectrometer of front end match circuit input end
1H nuclear and
19The input of F nuclear free induction decay signal, front end match circuit output termination is amplified the front-end protection circuit input end, and radio-frequency (RF) switch control circuit input end and Working state checking circuit input end be external radio-frequency (RF) switch control level input port respectively; Radio-frequency (RF) switch control circuit output terminal connects radio-frequency switch circuit respectively and amplifies the front-end protection circuit, amplifies the front-end protection circuit output end and connects input amplifier, and amplification circuit output end connects the output matching network input end, after output matching network output is amplified
1H nuclear and
19F nuclear free induction decay signal, Working state checking circuit and dc bias circuit connect feed circuit respectively.
2. high-field nuclear magnetic resonance spectrometer as claimed in claim 1
1H/
19F passage prime amplifier is characterized in that radio-frequency switch circuit is made up of the two-stage series connection PIN diode.
3. high-field nuclear magnetic resonance spectrometer as claimed in claim 1
1H/
19F passage prime amplifier is characterized in that the radio-frequency (RF) switch control circuit is made up of resistor network.
4. high-field nuclear magnetic resonance spectrometer as claimed in claim 1
1H/
19F passage prime amplifier is characterized in that amplifying circuit is made up of two-stage amplifier, and wherein the first order adopts low noise enhancement mode Pseudomorphic High Electron MobilityTransistor, and silicon twin-stage Darlington amplifier tube is adopted in the second level.
5. high-field nuclear magnetic resonance spectrometer as claimed in claim 1
1H/
19F passage prime amplifier, it is characterized in that front end pair net chromium is made of the oval high-pass filtering circuit in seven rank, the front end matching network is located at the front end of prime amplifier, links to each other with the probe port, be the public passage that receives and launch, the input and output impedance matching is 50 Ω.
6. high-field nuclear magnetic resonance spectrometer as claimed in claim 1
1H/
19F passage prime amplifier, protection amplifying circuit when it is characterized in that amplifying the front-end protection circuit and being used for emission state amplifies the front-end protection circuit and adopts the three-level protective structure.
7. high-field nuclear magnetic resonance spectrometer as claimed in claim 1
1H/
19F passage prime amplifier is characterized in that output matching network is made up of electric capacity and inductance network, realizes that the output impedance coupling is 50 Ω.
8. high-field nuclear magnetic resonance spectrometer as claimed in claim 1
1H/
19F passage prime amplifier is characterized in that the large-signal high power circuit that radio-frequency switch circuit, radio-frequency (RF) switch control circuit and front end match circuit are formed; Small-signal low noise circuit that amplification front-end protection circuit, amplifying circuit and output matching network are formed and Working state checking circuit totally three partial circuits are loaded on respectively in the shielding box, isolate mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201812294U CN201540363U (en) | 2009-11-03 | 2009-11-03 | 1H/19F channel preamplifier of high-field nuclear magnetic resonance spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201812294U CN201540363U (en) | 2009-11-03 | 2009-11-03 | 1H/19F channel preamplifier of high-field nuclear magnetic resonance spectrometer |
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| CN201540363U true CN201540363U (en) | 2010-08-04 |
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| CN2009201812294U Expired - Lifetime CN201540363U (en) | 2009-11-03 | 2009-11-03 | 1H/19F channel preamplifier of high-field nuclear magnetic resonance spectrometer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726713B (en) * | 2009-11-03 | 2012-10-31 | 厦门大学 | Preamplifier of high-field nuclear magnetic resonance spectrometer 1H/19F channel |
| CN104297706A (en) * | 2014-10-17 | 2015-01-21 | 华中科技大学 | Magnetic field generation device based on resonance and design method thereof |
| CN112379317A (en) * | 2020-06-15 | 2021-02-19 | 武汉中科牛津波谱技术有限公司 | Nuclear magnetic resonance pulse sequence controller |
-
2009
- 2009-11-03 CN CN2009201812294U patent/CN201540363U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726713B (en) * | 2009-11-03 | 2012-10-31 | 厦门大学 | Preamplifier of high-field nuclear magnetic resonance spectrometer 1H/19F channel |
| CN104297706A (en) * | 2014-10-17 | 2015-01-21 | 华中科技大学 | Magnetic field generation device based on resonance and design method thereof |
| CN112379317A (en) * | 2020-06-15 | 2021-02-19 | 武汉中科牛津波谱技术有限公司 | Nuclear magnetic resonance pulse sequence controller |
| CN112379317B (en) * | 2020-06-15 | 2021-05-18 | 武汉中科牛津波谱技术有限公司 | Nuclear magnetic resonance pulse sequence controller |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100804 Effective date of abandoning: 20091103 |
|
| RGAV | Abandon patent right to avoid regrant |