CN102608145A - Nuclear magnetic resonance analyzer and slide table thereof - Google Patents

Nuclear magnetic resonance analyzer and slide table thereof Download PDF

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CN102608145A
CN102608145A CN2012100672512A CN201210067251A CN102608145A CN 102608145 A CN102608145 A CN 102608145A CN 2012100672512 A CN2012100672512 A CN 2012100672512A CN 201210067251 A CN201210067251 A CN 201210067251A CN 102608145 A CN102608145 A CN 102608145A
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transistor
signal
magnetic resonance
nuclear magnetic
circuit
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CN2012100672512A
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CN102608145B (en
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于慧俊
傅少庆
刘化冰
李新
肖立志
胡海涛
郭葆鑫
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中国石油大学(北京)
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Abstract

The invention discloses a nuclear magnetic resonance analyzer and a slide table thereof. The slide table comprises a main frame, a sample support and a driving mechanism, the main frame is provided with a non-magnetic platform, a magnet box of the nuclear magnetic resonance analyzer is placed on the non-magnetic platform, the sample support is fixedly connected onto the non-magnetic platform, a detected sample is placed on the sample support, and the driving mechanism is arranged on the main frame, is connected with the magnet box of the nuclear magnetic resonance analyzer, and is used for driving the magnet box of the nuclear magnetic resonance analyzer to move so as to change the position of the magnet box of the nuclear magnetic resonance analyzer relative to the detected sample. By the aid of the slide table of the nuclear magnetic resonance analyzer, phase positions of a magnet in the nuclear magnetic resonance analyzer and the detected sample can be changed, so that different portions of the sample to be detected is placed in a uniform magnetic field, nuclear magnetic resonance measurement to different portions of the sample to be detected is realized, the size of the sample to be detected is not limited, and the dimension range of detected samples which are in nuclear magnetic resonance measurement is expanded.

Description

核磁共振分析仪滑台和核磁共振分析仪 NMR nuclear magnetic resonance analyzer and slide analyzer

技术领域 FIELD

[0001] 本发明涉及核磁共振测量技术,特别涉及一种核磁共振分析仪滑台和核磁共振分析仪。 [0001] The present invention relates to nuclear magnetic resonance measurement technique, particularly to a nuclear magnetic resonance analyzer and slide NMR analyzer.

背景技术 Background technique

[0002] 核磁共振分析仪是利用核磁共振原理对被测样品进行核磁共振实验的一种仪器, 通过对实验数据的解析实现对样品内部结构和宏观性质的探测。 [0002] Nuclear magnetic resonance analyzer is an apparatus for a test sample by nuclear magnetic resonance NMR experiments in principle, to achieve detection of the internal structure and macroscopic properties of the sample by analyzing the experimental data.

[0003] 目前,现有的核磁共振分析仪主要包括磁体、天线、主控电路、电子线路和上位机等,磁体用于产生核磁共振所需的静磁场;主控电路用于根据上位机设置的各种参数生成发射信号,并通过电子线路对发射信号进行处理后传送给天线,以激励天线产生使被测样品核磁共振的射频场;电子线路还可对天线采集的被测样品的回波信号进行处理以传送给主控电路;主控电路将该回波信号转换成数字信号,并得到回波的幅值和相位信息;上位机对主控电路传送的回波信号的幅值和相位信息进行解析,以得到被测样品中的流体信息和孔隙信息等。 [0003] Currently, conventional NMR analyzer includes a magnet, an antenna, a main control circuit, the electronic circuit and the host machine, a magnet for generating a static magnetic field required for NMR; the main control circuit is provided for according to the host electronic circuitry echo test sample may collected antenna; after various transmission parameters generated transmission signal and the transmission signal processed by the electronic circuit to the antenna, to excite the antenna so that the measured sample generate RF field NMR signals are processed for transmission to the main control circuit; amplitude and phase of the echo signal, the host computer transmits a control circuit; the main control circuit echo signal into a digital signal, and to obtain the amplitude and phase information of the echo analyzing information, and pore fluid information to obtain information in the test sample.

[0004] 在对被测样品进行核磁共振测量时,需将被测样品放置于磁体产生的静磁场中, 现有的核磁共振分析仪中,磁体产生的静磁场在一定空间范围内,而被测样品的尺寸不能超过磁体产生静磁场的空间范围,因而,被测样品的尺寸特别是长度,受到很大限制。 [0004] When the test sample nuclear magnetic resonance measurements, the test sample need to be placed in a static magnetic field generated by a magnet in a conventional nuclear magnetic resonance analyzer, in a static magnetic field generated by the magnet within a spatial range, is measuring the size of the sample must not exceed the scope of the magnet generating the static magnetic field space, and thus, the size of the length of the test sample in particular, is very restricted.

发明内容 SUMMARY

[0005] 本发明提供了一种核磁共振分析仪滑台和核磁共振分析仪,以扩大进行核磁共振测量的被测样品的尺寸。 [0005] The present invention provides a nuclear magnetic resonance analyzer and slide NMR analyzers, to enlarge the size of the test sample nuclear magnetic resonance measurements.

[0006] 本发明提供的核磁共振分析仪滑台,包括: [0006] The present invention provides a nuclear magnetic resonance analyzer slide, comprising:

[0007] 主框架,所述主框架上设置有无磁平台,所述无磁平台用于放置核磁共振分析仪的磁体箱体; [0007] The main frame, provided on the presence or absence of a magnetic internet main frame, the non-magnetic platform for placing a nuclear magnetic resonance analyzer magnet casing;

[0008] 样品支架,固定连接于所述无磁平台上,所述样品支架用于放置被测样品; [0008] The sample holder is fixedly connected to the non-magnetic platform on the sample holder for placing a test sample;

[0009] 驱动机构,设置于所述主框架上,所述驱动机构与核磁共振分析仪的磁体箱体相连,所述驱动机构用于驱动所述核磁共振分析仪的磁体箱体的移动以改变核磁共振分析仪的磁体箱体与被测样品的相对位置。 Mobile [0009] driving means, disposed on said main frame, said drive magnet means and housing a nuclear magnetic resonance analyzer is connected to the drive mechanism for driving the magnet housing nuclear magnetic resonance analyzer to change the relative position of the magnet housing and the test sample nuclear magnetic resonance analyzer.

[0010] 本发明另一个方面是提供了一种核磁共振分析仪,包括玻璃钢管、磁体和天线,还包括本发明实施例提供的滑台; [0010] Another aspect of the present invention is to provide a nuclear magnetic resonance analyzer, comprising a glass pipe, magnets and the antenna, further comprising a slide table according to an embodiment of the present invention;

[0011] 其中,所述天线缠绕于玻璃钢管外表面,所述天线相对于所述磁体固定设置,且置于所述磁体产生的磁场中; [0011] wherein said antenna wound around the outer surface of the glass pipe, the antenna is fixed relative to the magnet, the magnet and placed in a magnetic field generated;

[0012] 所述天线、玻璃钢管和磁体均设置于磁体箱体内,所述磁体箱体放置于所述滑台的无磁平台上,被测样品穿过所述玻璃钢管且放置于所述样品支架上。 [0012] The antenna, the glass tube and the magnets are disposed in the magnet housing, the magnet housing disposed on said slide table in the non-magnetic platform, the test sample passes through the glass tube and placed in the sample bracket.

[0013] 本发明提供的核磁共振分析仪滑台,核磁共振分析仪的磁体箱体可放置于无磁平台上,被测样品可放置于样品支架上,并设置有驱动机构,通过驱动机构带动磁体箱体的移动可改变磁体箱体与被测样品的相位位置,当磁体箱体在主框架上移动时,磁体箱体与被测样品的相位位置将发生改变,而磁体设置于磁体箱体内,也就是磁体与被测样品的相位位置发生改变,进而,磁体产生的均匀磁场与被测样品的相对位置也就改变,可使待测样品的不同部位置于均匀磁场中,对待测样品的不同部分进行核磁共振测量,因而,待测样品的尺寸不受限制,扩大了进行核磁共振测量的被测样品的尺寸。 [0013] The present invention provides slide NMR analyzer, nuclear magnetic resonance analyzer magnet housing may be placed on the non-magnetic platform, the test sample may be placed on the sample holder, and is provided with a drive mechanism, driven by a drive mechanism moving magnet box magnet housing may vary and the phase position of the sample under test, the tank when the magnet moves on the main frame, the phase position of the magnet housing and the test sample will change and the magnet disposed in the magnet cabinets , i.e. with the phase position of the magnet test sample is changed, and thus, the relative position of the test sample and the uniform magnetic field generated by a magnet will change, enables different parts of the sample to be tested is placed in a uniform magnetic field, the sample to be tested different parts of the nuclear magnetic resonance measurements, and thus, the sample size is not limited, to expand the size of the test sample nuclear magnetic resonance measurement is performed.

附图说明 [0014] 图I为本发明实施例所提供的核磁共振分析仪滑台的结构示意图;[0015] 图2为本发明另一实施例所提供的核磁共振分析仪滑台的结构示意图;[0016] 图3为本发明实施例所提供的核磁共振分析仪的结构示意图;[0017] 图4为本发明另一实施例所提供的核磁共振分析仪的结构示意图[0018] 图5为本发明实施例所提供的核磁共振分析仪中天线调谐电路的结构示意图;[0019] 图6为本发明实施例所提供的核磁共振分析仪中Q转换电路和隔离电路的结构示意图。 BRIEF DESCRIPTION [0014] Figure I is a schematic structural NMR analyzer slide table according to an embodiment of the invention; structural diagram of another embodiment of a nuclear magnetic resonance analyzer slide table provided in the embodiment [0015] FIG. 2 of the present invention, ; [0016] FIG. 3 is a schematic structural embodiment of a nuclear magnetic resonance analyzer embodiment of the present invention is provided; [0017] FIG. 4 is a schematic structural embodiment of the nuclear magnetic resonance analyzer according to another embodiment [0018] FIG. 5 is the invention NMR structural diagram of the antenna tuning circuit analyzer embodiment of the present embodiment provided by the invention; [0019] FIG. 6 is a schematic structural diagram of a nuclear magnetic resonance analyzer is provided wherein Q conversion circuit and an isolation circuit embodiment of the invention.

具体实施方式 Detailed ways

[0020] 核磁共振分析仪是利用核磁共振原理对被测样品进行核磁共振实验的仪器,核磁共振分析仪主要包括磁体、天线、主控电路、电子线路和上位机等。 [0020] Nuclear magnetic resonance analyzer is a test sample for NMR experiments using the principles of nuclear magnetic resonance instruments, NMR analyzers including a magnet, an antenna, a main control circuit, the electronic circuit and the host computer and the like.

[0021 ] 本发明实施例提供了一种核磁共振分析仪滑台,在利用核磁共振分析仪进行核磁共振实验时,可将核磁共振分析仪和被测样品分别放置于该滑台上,并且使被测样品置于核磁共振分析仪中磁体产生的磁场中,以进行核磁共振实验。 [0021] The present embodiment provides a nuclear magnetic resonance analyzer INVENTION A slide, when in the NMR experiments using nuclear magnetic resonance analyzer, nuclear magnetic resonance analyzer may be measured and samples were placed on the slide table, and the test sample nuclear magnetic resonance analyzer in a magnetic field generated in the magnet, for NMR experiments.

[0022] 图I为本发明实施例所提供的核磁共振分析仪滑台的结构示意图,如图I所示,该滑台包括主框架I、样品支架2和驱动机构3。 [0022] Figure I a schematic structural diagram of a nuclear magnetic resonance analyzer provided by the embodiment of the invention the slide table, as shown in FIG. I, the slide includes a main frame I, the specimen holder 2 and the drive mechanism 3.

[0023] 主框架I上设置有无磁平台101,无磁平台101用于放置核磁共振分析仪的磁体箱体20 ;样品支架2固定连接于无磁平台101上,样品支架2用于放置被测样品21 ;驱动机构3设置于主框架I上,驱动机构3与核磁共振分析仪的磁体箱体20相连,通过驱动机构3带动核磁共振分析仪的磁体箱体20的移动以改变核磁共振分析仪的磁体箱体20与被测样品21的相对位置。 Is provided on the [0023] main frame platform 101 I Have magnetic, non-magnetic platform 101 for placement of the magnet housing 20 nuclear magnetic resonance analyzer; sample holder 2 is fixedly connected to the non-magnetic platform 101, a sample holder 2 is placed measurement sample 21; driving means 3 is provided on the main frame I, a drive mechanism coupled to the magnet housing 3 a nuclear magnetic resonance analyzer 20, driven by the drive mechanism moves the magnet housing 20 NMR analyzer 3 to change the nuclear magnetic resonance analysis the relative position of the test sample 20 and the magnet housing 21 instrument.

[0024] 主框架为整个滑台的支撑框架,可采用多种材料制作,例如,木质材料,铜、铝合金等金属材料,主框架的结构形式也有多种,可以为如I图所示,为桌子式的结构,包括多个支撑腿,多个支撑腿上设置一水平桌面,该水平桌面即可作为无磁平台,无磁平台采用非磁化材料制作,例如,木材、铝合金等。 [0024] The main support frame for the entire frame of the slide, using a variety of materials, e.g., wood material, copper, aluminum and other metal materials, the main frame structure also has a plurality of, I can be shown as FIG. is a table-like structure, comprising a plurality of support legs, provided with a plurality of support legs horizontal table, a horizontal table which can be used as non-magnetic platform, non-magnetic platform with non-magnetized material, e.g., wood, aluminum and the like. 当然,主框架也可为其他的结构,不限于图I所示。 Of course, the main frame may be other structures, it is not limited to that shown in FIG. I.

[0025] 核磁共振分析仪的磁体可放置于磁体箱体内,以对磁体进行保护,并且,磁体箱体可起到屏蔽磁体产生的磁场,避免对磁场产生干扰的作用。 [0025] NMR analyzer magnet can be placed in the magnet housing, in order to protect the magnet and the magnet housing magnet generates a magnetic field shield may serve to avoid interference effect of the magnetic field. 主框架上设置有无磁平台,可将无磁平台与主框架固定连接,无磁平台可用于放置核磁共振分析仪的磁体箱体。 Have a magnetic platform is provided on the main frame, can be non-magnetic platform is fixedly connected with the main frame, the platform can be used to place non-magnetic nuclear magnetic resonance analyzer magnet housing.

[0026] 样品支架固定连接于无磁平台上,样品支架用于放置被测样品,可以为多种结构形式,具体结构可根据样品的具体形状设计,如图I所示,待测样品为圆柱形,样品支架可以为H型的支撑架,核磁共振仪的磁体放置于磁体箱体内,磁体产生的均匀磁场将位于磁体箱体内,在对待测样品进行测量时,可使待测样品穿过磁体箱体,以将待测样品的测量部分置于磁体产生的均匀磁场中,并将圆柱形待测样品的两端放置于H型支撑架的横梁上。 [0026] The sample holder is fixedly connected to the non-magnetic platform, a sample holder for placing a test sample, may be a variety of structural forms, specific structural design according to the specific shape of the sample, as shown in I, a cylindrical test sample type, H-type sample holder may be a support frame, nuclear magnetic resonance magnet disposed in the magnet housing, the magnet produces a uniform magnetic field the magnet housing, when the measurement sample to be tested, the test sample can pass through the magnet box, in order to measure the portion of the sample to be tested is placed in a uniform magnetic field generated by the magnet, and the two ends of the cylindrical sample to be tested is placed on the H-beam support frame. 当然,如果可设计其他结构的样品支架以放置待测样品,不限于图I所示的结构。 Of course, if other structures may be devised in the sample holder to place the test sample is not limited to the structure I shown in FIG.

[0027] 驱动机构设置于主框架上,驱动机构与核磁共振分析仪的磁体箱体相连,用于驱动磁体箱体移动,以改变磁体箱体与被测样品的相对位置。 [0027] The drive mechanism is provided on the main frame, the magnet drive mechanism housing and nuclear magnetic resonance analyzer is connected to the housing for driving the magnet to move to change the relative position of the magnet housing with the test sample.

[0028] 驱动机构可以为由电机和皮带等组成的结构,将磁体箱体与皮带相连或者放置于皮带上,通过电机转轴的转动带动皮带转动,从而带动磁体箱体的位置移动,以改变磁体箱体与被测样品的相位位置;驱动机构也可以为由液压机构、推动杆等组成的结构,将磁体箱体与推动杆相连,由液压机构控制推动杆移动,以改变磁体箱体与被测样品的相位位置,本实施例只是列举几种驱动机构的形式,驱动机构可以有多种结构形式,不限于本实施例所 [0028] The drive mechanism may be by a motor and belt structures and the like, the magnet housing is connected with the belt or is placed on a belt that is rotated by the rotation of the motor drive shaft, thereby driving position of the magnet housing, the magnet to change phase position of the test sample and the housing; a drive mechanism or may have a hydraulic mechanism, and other structures of the push bar, the push bar is connected to the magnet housing, the control rod is moved by the hydraulic mechanism driven to vary with the magnet housing phase position of the test sample, the present embodiments are recited in the form, several driving mechanism driving means may have a variety of structural forms, the embodiment is not limited to the present embodiment

/Jn ο / Jn ο

[0029] 由上述技术方案可知,核磁共振分析仪的磁体箱体可放置于无磁平台上,被测样品可放置于样品支架上,并设置有驱动机构,通过驱动机构带动磁体箱体的移动可改变磁体箱体与被测样品的相位位置,当磁体箱体在主框架上移动时,磁体箱体与被测样品的相位位置将发生改变,而磁体设置于磁体箱体内,也就是磁体与被测样品的相位位置发生改变,进而,磁体产生的均匀磁场与被测样品的相对位置也就改变,可使待测样品的不同部位置于均匀磁场中,对待测样品的不同部分进行核磁共振测量,因而,待测样品的尺寸不受限制,扩大了进行核磁共振测量的被测样品的尺寸。 [0029] From the above technical solutions, nuclear magnetic resonance analyzer magnet housing may be placed on the non-magnetic platform, the test sample may be placed on the sample holder, and is provided with a drive mechanism, driven by the drive mechanism of the magnet housing moves changing the phase position of the magnet can housing with the test sample, when the magnet moves in the main housing frame, the phase position of the magnet housing and the test sample will change and the magnet disposed in the magnet housing, i.e. magnet the phase position of the sample under test changes, and thus, the relative position of the test sample and the uniform magnetic field generated by a magnet will change, enables different parts of the sample to be tested is placed in a uniform magnetic field, different portions of the treated samples were measured NMR measurement, therefore, the sample size is not limited, to expand the size of the test sample nuclear magnetic resonance measurement is performed.

[0030] 图2为本发明另一实施例所提供的核磁共振分析仪滑台的结构示意图,在上述实施例的基础上,进一步的,如图2所示,该核磁共振分析仪滑台的驱动机构3包括第一皮带轮、第二皮带轮、电机驱动器301和步进电机302。 Schematic structural diagram of a nuclear magnetic resonance analyzer provided in the slide table [0030] FIG 2 a further embodiment of the present invention, in the above embodiment, the further, as shown, the nuclear magnetic resonance analysis instrument 2 slipway The drive mechanism 3 comprises a first pulley, a second pulley, the drive motor 301 and stepper motor 302.

[0031] 第一皮带轮和第二皮带轮(图中未示出)分别设置于无磁平台101上,第一皮带轮和第二皮带轮之间设置有传送带303,传送带303与核磁共振分析仪的磁体箱体20相连, 且核磁共振仪的磁体箱体20与无磁平台101滑动连接。 [0031] The first and second pulleys (not shown) are disposed on the non-magnetic platform 101, conveyor belt 303 is provided between the first and second pulleys, belt and the magnet case 303 nuclear magnetic resonance analyzer It is connected to body 20, and the magnet housing 20 nuclear magnetic resonance apparatus is slidably connected to the non-magnetic platform 101.

[0032] 可通过螺接、铆接等方式将第一皮带轮和第二皮带轮固定连接设置于无磁平台上,在第一皮带轮和第二皮带轮之间设置传送带,将传送带与核磁共振分析仪的磁体箱体相连,并且,磁体箱体与无磁平台滑动连接,当传送带转动时,可带动磁体箱体在无磁平台上滑动。 [0032] can be obtained by screwing, caulking, etc. The first and second pulleys arranged fixedly connected to the non-magnetic platform, the conveyor belt disposed between the first and second pulleys, the belt and the nuclear magnetic resonance analyzer magnet It is connected to the housing, and the magnet housing slidably connected to the non-magnetic platform, when the conveyor rotates, the magnet can be driven on a non-magnetic housing slidably internet.

[0033] 电机驱动器301与步进电机302相连,用于生成对步进电机302的控制脉冲信号。 [0033] 302 Motor driver 301 is connected to the stepping motor, for generating a control pulse signal to the stepping motor 302.

[0034] 步进电机302的转轴312与第二皮带轮相连,步进电机302的转轴312根据控制脉冲信号转动设定角度,以驱动第二皮带轮带动传送带303转动,从而带动核磁共振分析仪的磁体箱体100在无磁平台11上滑动。 [0034] The stepping motor 302 is connected to the rotary shaft 312 and the second pulley, the shaft 312 rotates the stepping motor 302 is set in accordance with the control angle of the pulse signal to drive a second conveyor belt driven pulley 303 is rotated, so as to drive the magnet of a nuclear magnetic resonance analyzer housing 100 slides on the non-magnetic platform 11.

[0035] 步进电机是将电脉冲信号转变为角位移或线位移的电机,步进电机的转速、停止的位置取决于脉冲信号的频率和脉冲数,电机驱动器用于生成对步进电机的控制脉冲信号,以驱动步进电机的转轴转动,电机驱动器每生成一个脉冲信号,就驱动步进电机按设定的方向转动(正转或反转)一个固定的角度,该角度也称步进角,步进电机的旋转是以固定的角度一步一步运行的。 [0035] Stepper motor is an electrical pulse signal into angular or linear displacement of the motor, stepper motor speed and stopping position depends on the frequency and the number of pulses of the pulse signal, for generating a motor drive of the stepping motor control pulse signal to the drive shaft of the stepping motor is rotated, each of the motor driver generates a pulse signal, the stepping motor is driven to set the direction of rotation (forward or reverse) a fixed angle, the stepping angle is also known as rotation angle of the stepping motor in a fixed angular step by step running. 可以通过控制脉冲信号的个数来控制角位移量,同时可以通过控制脉冲信号的频率来控制步进电机转动的速度和加速度,从而达到准确定位和调速的目的。 Can be controlled by the number of the angular displacement of the control pulse signal, the stepping motor can be controlled while the rotation speed and acceleration by controlling the frequency of the pulse signal, so as to achieve accurate positioning and speed control.

[0036] 本实施例中,将步进电机的转轴与第二皮带轮相连,从而步进电机在电机驱动器控制下带动第二皮带轮转动,第二皮带轮作为主动轮,第一皮带轮作为从动轮,通过第二皮带轮转动带动传送带沿第一皮带轮和第二皮带轮转动,进而,通过传送带带动磁体箱体在无磁平台上滑动,改变磁体箱体与被测样品的相对位置。 [0036] In this embodiment, the stepping motor connected to the rotary shaft and a second pulley, a second driven pulley thereby rotating the stepping motor in a motor drive control, as the second capstan pulley, the first pulley as a driven wheel, by second pulley rotates in a first rotation drive belt pulley and a second pulley, and further, the non-magnetic platform slides on a conveyor belt driven by a magnet housing, the magnet housing and changing the relative position of the test sample.

[0037] 本实施例中的驱动机构采用步进电机和传送带的驱动结构,通过步进电机控制磁体箱体的移动位置,具有较好的位置精度和运动的重复性,因此,可更加准确的定位被测样品置于磁体产生磁场中的部位,提高测量的精度。 [0037] The present embodiment uses a driving mechanism driving a stepping motor and the belt structure, the position of the magnet to control movement of the casing by a stepping motor, having a good positional accuracy and repeatability of the movement, and therefore, can be more accurate positioning the test sample was placed in the magnetic field generating portion, improve the measurement accuracy.

[0038] 并且,如图2所示,该滑台中样品支架2包括两个为H型支架,两H型支架相隔预设距离分别设置于无磁平台101上,其中,各H型支架包括一水平横梁201和两个垂直支撑杆202,两垂直支撑杆202底部分别固接于无磁平台101上,水平横梁201两端分别固接于各垂直支撑杆202上,被测样品20架设于两H型支架的水平横梁201上。 [0038] Then, as shown in FIG. 2, the slide 2 comprises a sample holder station is two H-shaped bracket, two H-shaped bracket spaced apart a predetermined distance are provided on the non-magnetic platform 101, wherein each H-shaped bracket comprising a two horizontal beams 201 and vertical support 202, two vertical support rods 202 are fixed to the bottom of the non-magnetic platform 101, horizontal beams 201 are respectively fixed to both ends of the respective vertical support 202, the test sample 20 two bridged H-level bracket on the beam 201.

[0039] 更进一步的,该滑台的主框架I可采用如图2所示的结构,主框架I包括至少一个支撑腿102,无磁平台101固接于支撑腿102上;支撑腿102下部设置有水平面板103,水平面板103用于放置核磁共振分析仪中上位机22、主控电路23和电子处理电路24 ;电机驱动器301固接于无磁平台101的底部壁面上。 [0039] Further, the main frame of the slide table I structure shown in FIG 2 may be employed, main frame I comprises at least one support leg 102, the non-magnetic platform 101 fixedly connected to the support leg 102; 102 supporting a lower leg 103 is provided with a horizontal panel, the horizontal panel 103 for placing a nuclear magnetic resonance analyzer host computer 22, the main control circuit 23 and the electronic processing circuit 24; a motor drive wall 301 fixed to the bottom 101 of the non-magnetic platform.

[0040] 上述实施例只是列举一种形式的核磁共振分析仪的滑台结构,在实际应用中,本领域技术可以对上述的结构做相应的变化,并不限于上述实施例的结构。 [0040] The above-mentioned embodiments include a form of slide structure of a nuclear magnetic resonance analyzer, in practical applications, the skilled can make corresponding changes to the structure described above, the structure is not limited to the above embodiment.

[0041] 本发明实施例还提供了一种核磁共振分析仪,该分析仪包括玻璃钢管、磁体和天线,还包括本发明实施例提供的滑台,其中,所述天线缠绕于玻璃钢管外表面,所述天线相对于所述磁体固定设置,且置于所述磁体产生的磁场中;所述天线、玻璃钢管和磁体均设置于磁体箱体内,所述磁体箱体放置于所述滑台的无磁平台上,被测样品穿过所述玻璃钢管且放置于样品支架上。 [0041] Embodiments of the invention also provides a nuclear magnetic resonance analyzer, the analyzer comprises a glass tube, the magnets and the antenna, further comprising a slide table according to an embodiment of the present invention, wherein the antenna is wound on the outer surface of the glass tube the antenna is fixed relative to the magnet, the magnet and placed in a magnetic field generated; the antenna, the glass tube and the magnets are disposed in the magnet housing, the magnet housing disposed on said slide table the non-magnetic platform, the test sample passes through the glass tube and placed on a sample holder.

[0042] 核磁共振分析仪是利用核磁共振现象对被测样品进行测量的仪器,下面首先对核磁共振现象进行简单介绍。 [0042] Nuclear magnetic resonance analyzer is a test sample was measured using NMR phenomenon instrument, the following nuclear magnetic resonance phenomenon is first briefly described.

[0043] 核磁共振是指原子核在另一外加磁场作用下发生能级跃迁,由低能态跃迁到高能态的物理现象。 [0043] NMR means Nuclear energy transition occurs at another external magnetic field, transition to a lower energy state by the high-energy state of the physical phenomena.

[0044] 并不是所有原子核都能产生这种现象,只有磁性核才能产生核磁共振现象,质量数和质子数均为偶数的原子核,自旋量子数为0,这类原子核没有自旋现象,称为非磁性原子核。 [0044] Not all atomic nuclei can produce this phenomenon, only magnetic nuclear magnetic resonance phenomenon can produce, the quality and number of protons are both even-number of nuclei, the spin quantum number is 0, there is no such nuclei spin phenomenon, known as nonmagnetic nucleus. 质量数为奇数的原子核,自旋量子数为半整数,其自旋量子数不为0,称为磁性原子核。 Nuclei odd mass number, is a half-integer spin quantum number, which is not zero spin quantum number, referred to as magnetic nuclei. 质量数为偶数,质子数为奇数的原子核,自旋量子数为整数,这样的核也是磁性原子核。 Mass number is an even number, an odd number of protons in the nuclei spin quantum number is an integer, this is nuclear magnetic nuclei.

[0045] 当磁性原子核自旋时,会因自旋产生一个磁矩,当该原子核在外加静磁场中接收其他来源的能量输入后会吸收特定频率的电磁波,从较低的能级跃迁到较高能级产生能级跃迁,这种过程就是核磁共振,发生核磁共振时,原子核磁矩与外加磁场的夹角会发生变化。 [0045] When the magnetic nuclear spin, spin generated by a magnetic moment, when the nucleus received from other sources in the applied static magnetic field energy input will absorb electromagnetic waves of a specific frequency, the transition from a lower to a higher energy level high energy level to generate energy transition, this process is the nuclear magnetic resonance, magnetic resonance occurs when the angle of the nuclear magnetic moment of the applied magnetic field will change.

[0046] 使原子核发生能级跃迁的频率由外加磁场的强度和原子核本身的性质决定,也就是说,对于某一特定原子,在一定强度的外加磁场中,其原子核进动的频率是固定不变的, 该频率被称为拉莫尔频率。 [0046] Nuclear the frequency level transition occurs is determined by the very nature of the nuclei and the strength of the applied magnetic field, that is, for a particular atom in a certain magnetic field strength, the frequency of precession nuclei which are stationary varying the frequency is called the Larmor frequency.

[0047] 为了让原子核发生能级跃迁,需要为原子核提供跃迁所需要的能量,该能量与外加磁场、核磁矩、以及核磁矩与外加磁场的夹角相关。 [0047] In order for the nuclei level transition occurs, the transition is required to provide the energy needed nucleus, the energy associated with the applied magnetic field, nuclear magnetic moments, and the angle of the nuclear magnetic moments with the external magnetic field. 这一能量通常是通过外加射频场来提供的,并且当外加射频场的频率与拉莫尔频率相同的时候,外加射频场的能量才能够有效地被原子核吸收,产生核磁共振现象,此时,可产生核磁共振的回波信号。 This energy is generally provided by applying a radio frequency field, and when the frequency of the applied RF field and the Larmor frequency of the same time, the RF field was applied energy can be effectively absorbed nuclei, nuclear magnetic resonance phenomenon, at this time, NMR echo signals may be generated.

[0048] 如定义外加静磁场的方向为Z轴,自旋的原子核达到热平衡状态后被扳离Z轴的角度称为扳转角,并由下式给出:Θ = YB1T,其中Θ为扳转角,B1S射频场强度,τ为射频脉冲持续的时间,射频脉冲的强度和持续时间决定了射频脉冲的能量。 [0048] after the application of static field direction is defined as a Z axis, the spin nuclei to reach a thermal equilibrium state to bend the angle of the Z axis is referred to as pull angle, is given by: Θ = YB1T, where [Theta] is the angle of pull , B1S RF field strength, the radio frequency pulse duration [tau] is the time, intensity and duration of the RF pulse determines the RF pulse energy.

[0049] 要实现通过发射射频脉冲产生的射频场将原子核从纵向上(与外加静磁场BO方向一致)扳转到横向平面,通常施加与外加静磁场方向垂直的射频场,并且,射频脉冲的频率要和拉莫尔频率相等,这样才能保证对原子核的有效扳转。 [0049] RF pulse to be achieved by transmitting radiofrequency fields generated by the nuclei (consistent with the external static field direction BO) to pull from the vertical transverse plane generally perpendicular to the applied RF field applied to the static magnetic field direction, and the RF pulse and the Larmor frequency equal to the frequency, so as to ensure effective pull the switch on the nucleus.

[0050] 该核磁共振分析仪,磁体用于产生核磁共振所需的外加静磁场;天线用于产生使被测样品产生核磁共振的射频场,并且,可采集被测样品核磁共振后产生的回波信号,当然,核磁共振分析仪还可以包括其他部件等,例如,上位机、主控电路和电子电路。 [0050] The nuclear magnetic resonance analyzer, a magnet for generating a static field is applied to the desired NMR; an antenna for generating a radio frequency test sample nuclear magnetic resonance field, and can be collected back after the test sample produced NMR wave signal, of course, nuclear magnetic resonance analyzer may further comprise other components like, for example, host computer, main control circuit and an electronic circuit.

[0051] 本实施例中,当对被测样品进行核磁共振测量时,使被测样品穿过玻璃钢管,而玻璃钢管置于磁体产生的静磁场中,因此,被测样品置于静磁场中的部分将产生核磁共振现象,且玻璃钢管上缠绕有天线,以接收回波信号,该天线可以为螺线管线圈或其他形式的天线结构。 [0051] In this embodiment, when the nuclear magnetic resonance measurement on the test sample, so that the measured sample through glass pipe while the glass tube was placed in a static magnetic field generated by the magnet, therefore, the test sample placed in a static magnetic field the portion of nuclear magnetic resonance phenomenon, and the glass pipe is wound antennas to receive echo signals, the antenna may be a solenoid or other forms of antenna structures. 并且,天线、玻璃钢管和磁体均设置于磁体箱体内,以对磁体进行保护,磁体箱体还可起到屏蔽磁体产生的静磁场,减少外界对静磁场产生电磁干扰的作用。 Further, the antenna, the glass tube and the magnets are disposed in the magnet housing, in order to protect the magnet, the magnet shield housing may also function magnet produces a static magnetic field, the external electromagnetic interference reducing effect of the static magnetic field.

[0052] 该核磁共振分析仪包括本发明实施例提供的滑台,核磁共振分析仪的磁体箱体可放置于滑台中无磁平台上,被测样品可放置于样品支架上,并设置有驱动机构,通过驱动机构带动磁体箱体的移动可改变磁体箱体与被测样品的相位位置,当磁体箱体在主框架上移动时,磁体箱体与被测样品的相位位置将发生改变,而磁体设置于磁体箱体内,也就是磁体与被测样品的相位位置发生改变,进而,磁体产生的静磁场与被测样品的相对位置也就改变,可使待测样品的不同部位置于静磁场中,对待测样品的不同部分进行核磁共振测量,因而,待测样品的尺寸不受限制,扩大了进行核磁共振测量的被测样品的尺寸。 [0052] The nuclear magnetic resonance analyzer comprises a magnet housing slide, nuclear magnetic resonance analyzer according to an embodiment of the present invention may be placed on the non-magnetic slider on the station platform, the test sample may be placed on the sample holder, and is provided with a drive It means, moving the magnet housing driven by the drive mechanism changes the phase position of the magnet housing with the test sample, when the magnet moves in the main housing frame, the phase position of the magnet housing and the test sample will change, and a magnet disposed in the magnet housing, the phase position of the magnet is changed with the test sample, and further, the relative positions of the static magnetic field generated by a magnet test sample also changes, can be measured in different parts of the sample placed in a static magnetic field , treat different portions of the test sample nuclear magnetic resonance measurements, and thus, the sample size is not limited, to expand the size of the test sample nuclear magnetic resonance measurement is performed.

[0053] 图3为本发明实施例所提供的核磁共振分析仪的结构示意图,如图3所示,在上述实施例的基础上,进一步的,该核磁共振分析仪还包括上位机22、主控电路23和电子处理电路24。 [0053] FIG. 3 is a schematic structural embodiment of a nuclear magnetic resonance analyzer embodiment of the present invention is provided, shown in Figure 3, based on the above embodiment, further, the nuclear magnetic resonance analyzer further comprises a host computer 22, a main control circuit 23 and the electronic processing circuit 24.

[0054] 上位机22用于设置测量模式的参数信息以传送给主控电路23,并对主控电路23 传送的回波的幅值和相位信息进行解析,以得到被测样品中的流体信息和孔隙信息。 [0054] The host computer 22 for setting the measurement parameter information to transmit to the master mode circuit 23, and the amplitude and phase information of the echo transfer control circuit 23 is parsed to obtain a test sample of fluid information and porosity information.

[0055] 上位机可设置测量模式的参数信息,该参数信息包括步进电机的转轴转动的角度、回波的采集周期、待测样品的类型、激励信号的频率、极化时间、回波间隔、回波个数等。 [0055] The host computer may set the measurement mode information parameter, the parameter information comprises a shaft rotating angle of the stepping motor, the echo acquisition cycle, the type of sample to be tested, the excitation signal frequency, polarization time, echo spacing , the number of echoes and the like. 上位机还可根据对接收到的回波的幅值和相位信息的处理和反演得到被测样品中的流体信息和孔隙信息,例如,被测样品中流体的类型、孔隙介质的孔隙度、孔隙尺寸等。 PC may obtain information and pore fluid test sample according to the information processing and inversion amplitude and phase of the received echo information, e.g., porosity type fluid test sample, the porous medium, pore size and the like.

[0056] 主控电路23与上位机22相连,用于根据所述测量模式的参数信息生成步进控制信号以传送给电机驱动器301,以控制所述电机驱动器301根据所述步进控制信号生成对步进电机302的控制脉冲信号,且生成激励信号以传送给电子处理电路24,并将接收到的电子处理电路24后的回波信号转换成数字信号以得到回波的幅值和相位信息后传送给上位机22。 [0056] The main control circuit 23 is connected to the host computer 22, according to the step 301 for generating a control signal according to the measurement mode parameter information generation step to transmit a control signal to the motor driver 301 to control the motor driver control pulse signal of the stepping motor 302, and generates an excitation signal for transmission to electronic processing circuit 24, and the echo signal 24 into a digital signal received electronic processing circuit to obtain the amplitude and phase information of the echo after transfer to the host computer 22.

[0057] 主控电路为分析仪的控制电路,用于根据测量模式的参数信息生成各种控制信号,例如,步进控制信号、激励信号等,并可将电子处理电路处理后的回波信号转换成数字信号,进而,采用相敏检波算法或其他算法对该数字信号进行处理后得到回波的幅度和相位信息,并上传给上位机。 [0057] The control circuit of the control circuit of the analyzer, for generating various control signals according to the parameter information measuring mode, e.g., the step control signal, the excitation signal or the like, and the electronic echo signal processing circuit converted into a digital signal, and then, using the obtained amplitude and phase information of the echo phase sensitive detection algorithms or other algorithms for processing the digital signal, and uploaded to the host computer.

[0058] 电子处理电路24,分别与所述主控电路23和天线25相连,用于根据接收到的激励信号生成射频脉冲信号以激励天线25产生使被测样品核磁共振的射频场,并接收天线25 采集的被测样品核磁共振后产生的回波信号,以将所述回波信号进行处理后传送给主控电路23。 [0058] The electronic processing circuit 24, respectively connected to the main control circuit 23 and an antenna 25, according to a received excitation signal generating radio frequency pulses to excite the antenna 25 produces a signal that the test sample nuclear magnetic resonance radio frequency field, and receiving after the echo signals collected test sample nuclear magnetic resonance of the antenna 25, to the echo signals after the processing to the main control circuit 23 transmits.

[0059] 电子处理电路可根据主控电路发送的激励信号生成射频脉冲信号,该射频脉冲信号可激励天线产生射频场,该射频脉冲信号的频率需与拉莫尔频率相等,以使被测样品发生核磁共振;电子处理线路还可接收天线采集的回波信号,并对回波信号进行放大、滤波等处理后输送给主控电路。 [0059] The electronic processing circuit may generate the RF excitation signal transmitted pulse signal control circuit, the RF pulse signal may generate the RF field to excite the antenna, the frequency of the RF pulse signal is equal to the Larmor frequency required to make the test sample Nuclear magnetic resonance occurs; electronic processing circuit is supplied to the control circuit may also receive echo signals acquired antenna, and amplifies the echo signal and filtering process.

[0060] 本实施例的核磁共振分析仪,将核磁共振分析仪分成几大功能模块,主要包括作为支撑架的滑台、控制部分、电子线路部分,控制部分为上位机和主控电路,电子线路部分为电子处理电路,该分析仪采用模块化的设计思想,各部分分别完成相应的功能,并且,各部分相互配合,可方便的完成对分析仪的操作,降低对分析仪的操作难度。 [0060] NMR analyzer of the present embodiment, the NMR analyzer is divided into several functional modules, including a slide table support frame, the control section, the electronic circuit section, the control section of the host computer and the main control circuit, the electronic electronic processing circuit for the line portion, the analyzer uses a modular design, each of the respective function portions are completed, and the portions cooperate with each other, can easily perform operations on the analyzer, to reduce the difficulty of the operation of the analyzer.

[0061] 图4为本发明另一实施例所提供的核磁共振分析仪的结构示意图,如图4所示,在图3所示结构的分析仪基础上,进一步的,该核磁共振分析仪中所述电子处理电路24包括数模转换器241、光耦隔离器242、晶体管驱动器243、隔离变压器244、晶体管电路245、直流电源模块246、第一差分驱动器247、仪用放大器248、第二级放大器249、程控衰减器250、两级放大器251、带通滤波器252、第二差分驱动器253、差分接收器254和抗混叠滤波器255。 , In the analyzer shown in FIG. 3 based on the structure, further, the nuclear magnetic resonance analyzer 4, a schematic view of a nuclear magnetic resonance analyzer according to another embodiment of the [0061] present invention, FIG. 4, FIG. the electronic processing circuit 24 comprises a digital to analog converter 241, optical isolators 242, driver transistor 243, isolation transformer 244, a transistor circuit 245, the DC power supply module 246, a first differential driver 247, instrumentation amplifier 248, a second stage amplifier 249, programmable attenuators 250, 251 two-stage amplifier, a bandpass filter 252, a second differential driver 253, differential receiver 254 and anti-aliasing filter 255.

[0062] 数模转换器241与所述主控电路23相连,用于将主控电路23生成的激励信号转换成模拟电信号以传送给光耦隔离器242。 [0062] DAC 241 and the main control circuit 23 is connected to the main control circuit 23 for converting the generated excitation signal to an analog electrical signal transmission to optical isolators 242.

[0063] 主控电路根据测量模式的参数信息生成的激励信号为数字形式的信号,而电子处理电路处理的信号为模拟电信号,因此,通过数模转换器将激励信号转换成模拟电信号。 [0063] The control circuit according to the parameter information generated in the measurement mode of excitation signals into a digital format, and an electronic signal processing circuit is an analog electrical signal, and therefore, the excitation signal is converted by the digital to analog converter into an analog electrical signal.

[0064] 光耦隔离器242,连接于所述数模转换器241和晶体管驱动器243之间,用于将数模转换器241与晶体管驱动器243光电隔离。 [0064] The optical isolators 242, 241 are connected to the digital to analog converter and the transistor between the driver 243 for the digital to analog converter 241 and optical isolation transistor driver 243.

[0065] 光耦隔离器用于将数模转换器与晶体管驱动器进行光电隔离,而数模转换器前端为主控电路,通过光耦隔离器可防止晶体管驱动器和晶体管电路产生的高压脉冲信号对主控电路产生干扰,并对主控电路起到保护作用。 [0065] The digital to analog converter for optical isolators and optical isolation transistor driver, the front end of the digital to analog converter control circuit, high-voltage pulse signal through optoisolator transistor driver can be prevented and the generation of the main transistor circuit interference control circuit, and the control circuit protection.

[0066] 隔离变压器244,所述隔离变压器244的一次侧与晶体管驱动器243相连,所述隔离变压器244的二次侧与晶体管电路245相连,用于将晶体管驱动器243与晶体管电路245 电气隔离。 [0066] The isolation transformer 244, the primary side of the isolation transformer and the transistor 243 is connected to driver 244, the isolation of the secondary-side circuit of the transformer 244 and the transistor 245 is connected to the transistor driver circuit 245 and the transistor 243 electrically isolated.

[0067] 隔离变压器的作用是将晶体管驱动器和晶体管电路电气隔离,以防止晶体管电路中相应晶体管导通时产生的高压直流信号对晶体管驱动器中的器件造成损坏。 Effect [0067] The isolation transformer is a transistor driver circuits and electrical isolation transistor to prevent a high voltage direct current signal generated when the transistor circuit corresponding transistor is turned on to cause damage to the transistors in the drive device. 隔离变压器为I : I的变压器,二次侧的输出信号与一次侧的输入信号的相关参数均相同,不对信号进行变换,经过隔离变压器后输出信号的相关参数不发生变化。 Isolating transformer I: I transformer, the relevant parameters of the input signal, the output signal of the primary side and the secondary side are the same, no signal is transformed, through the isolation transformer relevant parameters of the output signal does not change.

[0068] 晶体管驱动器243,与晶体管电路245相连,用于将光耦隔离器242输出的模拟电信号进行放大以生成驱动控制信号,并经隔离变压器244的二次侧输出。 [0068] The drive transistor 243 is connected to the transistor circuit 245 for converting the analog electrical signal output from the optoisolator 242 is amplified to generate a driving control signal, and outputting the secondary side of isolation transformer 244.

[0069] 晶体管驱动器用以将模拟电信号进行放大,以生成驱动控制信号,该驱动控制信号可为电流或电压信号,用于控制晶体管电流中相应晶体管的快速导通。 [0069] The drive transistor for amplifying the analog electrical signal to generate a driving control signal, the driving control signal may be a current or voltage signal, for fast turn-on controlling transistor of the current in the respective transistors.

[0070] 直流电源模块246,与所述晶体管电路245相连,用于为所述晶体管电路245提供直流电压。 [0070] DC power supply module 246, the transistor circuit 245 is connected to the transistor circuit for providing a DC voltage 245.

[0071 ] 直流电源模块用于给晶体管电路提供直流电压,该电压通常为电压值较大的电压,例如,几千伏的高电压。 [0071] DC power supply for providing a DC voltage to a transistor circuit, the voltage value of the voltage is typically larger voltage, e.g., a high voltage of several volts.

[0072] 晶体管电路245,与天线25相连,用于根据所述驱动控制信号将直流电压斩波成方波脉冲形式的射频脉冲信号以激励天线25产生使被测样品核磁共振的射频场。 [0072] The transistor circuit 245, connected to an antenna 25, a control signal according to said driving DC voltage of the chopper square wave pulse form a radio frequency pulse to excite the antenna 25 to generate a sample of the measured NMR RF field.

[0073] 晶体管电路为由多个晶体管组成的电路,例如,可为由四个金属-氧化层-半导体-场效晶体管(Metal-Oxide-Semiconductor Field-Effect Transistor,简称M0SFET) 组成的全桥开关电路,驱动控制信号控制电路中的各MOS管的导通或关断,以将直流电压斩波成方波形式的射频脉冲信号,并且,使该射频脉冲信号的频率和拉莫尔频率相等,该射频脉冲信号可激励天线产生射频场,以使被测样品发生核磁共振。 [0073] The transistor circuit composed of transistors by a plurality of circuits, for example, by four metal - oxide - semiconductor - field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, referred M0SFET) consisting of full-bridge switch circuit, a drive control signal of each MOS transistor circuit is turned on or off to form a DC voltage of the chopper square wave RF pulse signal and the frequency of the Larmor frequency equal to the RF pulse signal, the RF pulse signal may generate the RF field to excite the antenna, so that a test sample nuclear magnetic resonance occurs.

[0074] 第一差分驱动器247,与天线25相连,用于将天线25采集的被测样品生成的回波信号转换成两路差分回波信号。 [0074] The first differential driver 247, connected to an antenna 25, an antenna for converting the test sample 25 collected echo signals generated echo signal into two differential.

[0075] 第一差分驱动器用于将天线采集的回波信号转换成两路差分回波信号,目的在于,经过对回波信号进行差分处理,可较容易的识别到比较弱的回波信号,并且,由于差分信号对外部电磁干扰具有高度免疫性,可保证回波信号传送过程中的精度,以为主控电路提供高精度的回波信号。 [0075] The first differential driver for converting the echo signal into two antenna differential acquired echo signals, object, through differential processing of the echo signal, may be easier to identify the weak echo signals, Further, since the differential signal has a high degree of immunity to external electromagnetic interference, to ensure the accuracy of the echo signal transmission process, control circuit that provides highly accurate echo signal.

[0076] 仪用放大器248,通过屏蔽双绞线与所述第一差分驱动器247相连,通过屏蔽双绞线将所述两路差分回波信号传输给所述仪用放大器248,以通过仪用放大器248将所述两路差分回波信号放大第一设定倍数后输出一路回波信号。 [0076] The instrumentation amplifier 248, through the first shielded twisted pair differential driver 247 is connected, through the two shielded twisted pair differential signal to said echo instrumentation amplifier 248, through a meter the amplifier 248 outputs the amplified echo signal along a first set of said two differential multiple echo signal.

[0077] 通过屏蔽双绞线进行差分信号的传输,可抵御回波信号传输过程中外界的电磁干扰和减小两路回波信号之间的电磁干扰。 [0077] transmitted through the shielded twisted pair differential signal, the echo signals against electromagnetic interference during transmission and reduce external electromagnetic interference between the two echo signals.

[0078] 仪用放大器为一种差分放大器,可接收两路差分回波信号,将微伏级的回波信号放大后输出一路回波信号,仪用放大器具有很高的增益和很小的噪声系数,具有良好的阻抗匹配性能和较好的共模抑制能力,因此,可降低回波信号的失真度。 [0078] The instrument as a differential amplifier may receive two differential amplifier echo signal, the echo signal amplified output one microvolt echo signals, instrumentation amplifier having a high gain and small noise factor, impedance matching with good properties and good common-mode rejection, therefore, can reduce the distortion of the echo signal.

[0079] 第二级放大器249,与所述仪用放大器相连248,用于将所述仪用放大器248输出的回波信号放大第二设定倍数后输出。 [0079] The second stage amplifier 249, and is connected to the instrumentation amplifier 248 for amplifying the second set the instrument with multiple echo signal output from the output amplifier 248.

[0080] 由于仪用放大器对回波信号的放大倍数具有一定范围,因此,再次通过第二级放大器对回波信号进行第二次的放大后输出。 [0080] Since the instrument has a range of the echo signal amplification factor of an amplifier, and therefore, echo signals again by a second stage amplifier of the second amplified output.

[0081] 程控衰减器250,与所述第二级放大器249相连,用于将所述第二级放大器249输出的回波信号衰减设定量后输出。 [0081] The programmable attenuator 250, and amplifier 249 is connected to the second stage, for the echo signal output from the second stage amplifier 249 outputs the attenuation amount is set.

[0082] 通过上述的仪用放大器和第二级放大器对回波信号进行两次放大后,为避免回波信号的失真,通过程控衰减器对回波信号进行衰减,可使仪用放大器和第二级放大器对信号的放大处理具有一定的动态范围,从而可以对不同孔隙度的被测样品进行高信噪比的测量,程控衰减器对信号的衰减量可以为12dB、18dB、24dB、30dB、36dB、42dB等衰减量。 After the [0082] two of the echo signal amplified by the amplifier and the second amplifier stage through the above-described apparatus, in order to avoid distortion of the echo signal, the echo attenuation of the signal through programmable attenuators, and instrument amplifier can secondary amplifier has a certain dynamic range of the signal amplification processing, high SNR can be measured, the programmable attenuator the attenuation amount of a signal can be 12dB, 18dB, 24dB, 30dB samples tested different porosity, attenuation of 36dB, 42dB and so on.

[0083] 两级放大器251,与所述程控衰减器250相连,用于将所述程控衰减器250输出的回波信号放大第三设定倍数后输出。 Outputs the [0083] two amplifier 251, the programmable attenuator 250 is connected to the output 250 for the programmable attenuator setting the third echo signal amplification factor.

[0084] 带通滤波器252,与所述两级放大器251相连,用于抑制所述两级放大器251输出的回波信号中设定频率的信号分量。 [0084] The band-pass filter 252, 251 is connected with the two-stage amplifier, for suppressing a signal component of the echo signal output from the two-stage amplifier 251 set frequency.

[0085] 经过程控衰减器对回波信号进行衰减后,信号会减弱,因此,再次通过两级放大器对回波信号进行最后的放大后,传送给带通滤波器,由带通滤波器限制整个电子处理电路的带宽以抑制噪声。 [0085] After the programmable attenuator for attenuating the echo signal, the signal will decrease, thus, final again amplified echo signal by the two-stage amplifier, transmitted to the band-pass filter, is limited by the overall band-pass filter the bandwidth of the electronic processing circuit to suppress noise.

[0086] 带通滤波器可使回波信号中某一频率范围内的信号通过,而将其他范围频率的信号分量衰减到极低水平,以抑制回波信号中的谐波。 [0086] signal through a band-pass filter allows the echo signal in a certain frequency range, and the signal components of other frequency attenuation range to an extremely low level, in order to suppress harmonics in the echo signal.

[0087] 第二差分驱动器253,与所述带通滤波器252相连,用于将所述带通滤波器252输出的回波信号转换成两路差分回波信号。 [0087] The second differential driver 253, and converting the band-pass filter 252 is connected to the echo signal output from the band pass filter 252 into two differential signal echo.

[0088] 差分接收器254,通过屏蔽双绞线与所述第二差分驱动器253相连,用于将所述第二差分驱动器253输出的两路差分回波信号变换成一路回波信号。 [0088] The differential receiver 254 through shielded twisted pair and the second differential driver 253 is connected to two differential for converting the echo signal output from said second differential driver 253 all the way to the echo signal.

[0089] 为进一步减少信号传输过程中的共模噪声,对回波信号进行差分传输,通过第二差分驱动器将带通滤波器输出的回波信号转换成两路差分回波信号,并通过屏蔽双绞线传送给差分接收器,经差分接收器接收后变为一路回波信号,以传送给后面的电路。 [0089] To further reduce the common mode noise signal transmission process echo signals for differential transmission, the differential driver through the second band-pass filter converts the echo signal into two differential output echo signals, and by shielding UTP transmitted to a differential receiver, the differential receiver receives the echo signal becomes a way to transfer to the subsequent circuits.

[0090] 抗混叠滤波器255,与所述差分接收器254相连,用于过滤所述差分接收器254输出的回波信号中的谐波信号以传送给主控电路23。 [0090] The anti-aliasing filter 255, 254 connected to the differential receiver, an echo signal 254 for the harmonic signal output by the differential filter in the receiver circuit 23 to transmit to the master.

[0091] 抗混叠滤波器是一种低通滤波器,用以将回波信号中的混叠频率分量降低到微不足道的程度,以得到质量较好的回波信号。 [0091] The anti-aliasing filter is a low pass filter for the echo signal in the aliasing frequency component is reduced to insignificant levels, in order to obtain a good quality of the echo signal.

[0092] 经过上述的电子处理电路,可分为两大部分,第一部分包括模转换器、光耦隔离器、隔离变压器、晶体管驱动器、直流电源模块和晶体管电路;第二部分包括第一差分驱动器、仪用放大器、第二级放大器、程控衰减器、两级放大器、带通滤波器、第二差分驱动器、差分接收器和抗混叠滤波器;第一部分用于完成对天线的激励,使被测样品产生核磁共振,第二部分用于对接收到的核磁共振后回波信号进行处理后,以得到低噪声质量较好的回波信号,并传送给主控电路。 [0092] After the above-described electronic processing circuit can be divided into two parts, a first part comprising analog converter, optocouplers, isolation transformer, transistor driver, DC power supply and the transistor circuit; second portion includes a first differential driver , instrumentation amplifier, a second amplifier stage, programmable attenuator, two-stage amplifier, a bandpass filter, a second differential drivers, differential receivers, and anti-aliasing filter; a first portion for performing the excitation of the antenna, so that is measuring nuclear magnetic resonance sample, the NMR echo signal after a second portion for processing the received, to obtain a better quality low-noise echo signals, and transmitted to the main control circuit.

[0093] 并且,该分析仪中所述主控电路23包括模数转换驱动器231、模数转换器232、现场可编程门阵列单元233和数字信号处理器234。 [0093] Then, the analyzer 23 comprises a main control circuit in the analog to digital converter driver 231, analog to digital converter 232, a field programmable gate array unit 233 and a digital signal processor 234.

[0094] 模数转换驱动器231,与所述抗混叠滤波器相连,用于将所述抗混叠滤波器输出的回波信号转换成设定频率和幅值的模拟电压信号后输出。 [0094] After analog to digital converter output driver 231, the anti-aliasing filter is connected to the anti-aliasing filter output is converted into an echo signal setting the frequency and amplitude of an analog voltage signal.

[0095] 模数转换器232,与所述模数转换驱动器231相连,用于将模数转换驱动器输出的模拟电压信号转换成数字信号后输出。 [0095] analog to digital converter 232, the analog to digital converter coupled to the driver 231 for converting the analog voltage signal drives the output of analog to digital converter into a digital signal.

[0096] 经过电子电路处理后输出的回波信号为模拟信号,而上位机只能接收数字信号, 因此,需将模拟形式的回波信号转换成数字信号以传送给上位机。 [0096] After the echo signal to the electronic circuit outputs an analog signal processing, the host computer can receive the digital signal, and therefore, the need to convert the analog echo signal into a form of a digital signal for transmission to the host computer.

[0097] 模数转换器即为将模拟形式的回波信号转换成数字信号的装置,并且,在模数转换器前端设置模数转换驱动器,模数驱动器作为模数转换器的外部缓冲器来减小模数转换器采样时产生的瞬态电流对采样的影响,同时模数转换驱动电器还可用于将抗混叠滤波器的输出回波信号转变为满足模数转换器输入要求的设定频率和幅值的电压信号,然后再由模数转换器将其转换为数字信号。 The analog to digital converter means is the [0097] form of the analog echo signal into a digital signal, and the analog to digital converter at the front end of the external buffer drive ADC, analog to digital converter module to drive as Effect of the transient current generated when reducing the sampling analog to digital converter sampling, while analog to digital converter output signals into an echo electrical drive can also be used for anti-aliasing filter to meet the requirements set input of the ADC frequency and amplitude voltage signal, and then converted by an analog to a digital signal.

[0098] 现场可编程门阵列单元233,与所述模数转换器232相连,用于将模数转换器232 输出的数字信号进行缓存,且根据经过数字信号处理器解码后的测量模式的参数信息生成步进控制信号以传送给电机驱动器301,以控制所述电机驱动器301根据所述步进控制信号生成对步进电机302的控制脉冲信号,并生成激励信号以传送给所述数模转换器241。 [0098] field programmable gate array unit 233, the analog to digital converter 232 is connected to analog to digital converter for converting a digital signal output from the cache 232, and through the measurement mode according to the digital signal processor decodes the parameters information generation step to transmit a control signal to the motor driver 301 to control the motor driver 301 generates a control signal based on said stepping pulse signal controls the stepping motor 302, and generates an excitation signal for transmission to the digital to analog converter 241.

[0099] 现场可编程门阵列(Field-Programmable Gate Array,简称FPGA)单兀,为一种专用集成电路,FPGA采用了逻辑单元阵列这一概念,其内部包括控制逻辑时序生成单元、静态存储模块、内部连线模块、各个定时器和计数器等,可实现组合逻辑功能和时序逻辑功能, FPGA的逻辑功能是通过向其内部的静态存储单元加载编程数据来实现的。 [0099] FPGA (Field-Programmable Gate Array, referred FPGA) single Wu, as a ASIC, FPGA logic cell arrays using the concept that the internal timing generating unit comprising control logic, static storage module , interconnector modules, timers and counters, and logic functions can be implemented as a combination of sequential logic functions, the logic function of the FPGA is programmed by loading the data storage unit inside its static realized.

[0100] FPGA可并行接收数字信号处理器解码后的测量模式的参数信息,将该参数信息分发给其内部的各个定时器或计数器,并由控制逻辑时序生成单元产生步进控制信号以传送给电机驱动器,并且,可通过其静态存储单元对模数转换器传送的数字信号进行缓存后发送给数字信号处理器。 [0100] FPGA parameter measuring mode information after receiving the parallel digital signal processor decoding the parameter information distributed to each of its internal timer or counter, and by the control logic timing generation unit generates a control signal for transmission to the stepper after the motor driver, and the cache may be an analog-digital signal transmitted by the static memory cell to the digital signal processor. 当然,也可通过在FPGA中的静态存储单元加载其他的编程数据生成其他需要的信号。 Of course, also be loaded other programming signals to generate other desired data through the static memory cell in the FPGA.

[0101] 数字信号处理器234,与所述现场可编程门阵列单元233相连,用于对所述测量模式的参数信息进行解码,并生成回波数据读取信号以读取所述现场可编程门阵列单元233 中存储的数字信号并根据预设算法得到回波的幅值和相位信息以传送给上位机22。 [0101] digital signal processor 234, connected to the field programmable gate array unit 233, the parameter information for decoding the measurement mode, and generates the echo data read signal to read the field programmable gate array cell 233 stored in the digital signal and the echo amplitude and phase information obtained according to a preset algorithm for transmission to the host computer 22.

[0102] 数字信号处理器(digital signal processor,简称DSP)为一种独特的微处理器, 是以数字信号来处理大量信息的器件,可对数字信号进行修改、删除、解码等处理,并可将把数字信号解译回模拟数据或实际环境格式。 [0102] The digital signal processor (digital signal processor, abbreviated DSP) is a unique microprocessor, a digital signal processing device is a lot of information, the digital signal can be modified, deleted, decoding process, and It will interpret digital signals back to analog format data or the physical environment. 它具有可编程性,并且具有强大数据处理能力,可实时运行每秒数以千万条复杂指令程序。 It is programmable, and has powerful data processing capability, can run tens of millions of instructions per second complex procedures in real time.

[0103] DSP可通过USB总线接收上位机传送的测量模式的参数信息并进行解码,再通过并行总线将解码后的数据传给FPGA ;并且,可根据其内部的时钟生成回波数据读取信号, 以读取FPGA中存储的数字信号,并根据预设算法得到回波的幅值和相位信息以传送给上位机。 [0103] DSP can be decoded by the parameter information received measurement mode USB bus host computer and transmitted, through the parallel bus to the FPGA to pass the decoded data; and, in accordance with the read enable signal echo data clock inside thereof , to read digital signals stored in the FPGA, and in accordance with the preset amplitude and phase information of the echo algorithm to transmit to the host computer. 该预设算法可以有多种,例如,相敏检波算法等。 The predetermined algorithm may have multiple, for example, phase sensitive detection algorithm.

[0104] 上述实施例的核磁共振分析仪,提供了一种主控电路和电子处理电路中包含的各元件和电路结构,当然,也可采用其他形式的主控电路和电子处理电路,并不限于上述实施例所示。 NMR analyzer [0104] the above-described embodiment, there is provided a structure for each of the circuit elements and the electronic processing circuit and a control circuit included, of course, it can be other forms of electronic processing circuit and a control circuit, not limited to the illustrated embodiment.

[0105] 图5为本发明实施例所提供的核磁共振分析仪中天线调谐电路的结构示意图,在上述实施例的基础上,进一步的,该核磁共振分析仪中还包括天线调谐电路,如图5所示, 该天线调谐电路包括射频继电器26和多个无磁电容27。 [0105] FIG. 5 is a schematic structure of a nuclear magnetic resonance analyzer, the antenna tuning circuit according to embodiments of the present invention is provided, based on the above-described embodiments, further, the nuclear magnetic resonance analyzer further includes an antenna tuning circuit, FIG. 5, the antenna tuning circuit 26 includes a radio frequency relay 27 and a plurality of non-magnetic capacitors.

[0106] 其中,各无磁电容27串联后连接于所述天线25两端;所述射频继电器26的输入端261与所述现场可编程门阵列单元相连,所述射频继电器26中输出端的各触点262分别与各所述无磁电容27并联;所述现场可编程门阵列单元233还用于根据所述测量模式的参数信息生成开关控制信号,以控制所述射频继电器26中输出端的各触点262的闭合或断开,从而将相应无磁电容27连接于所述天线25两端。 [0106] wherein each of the non-magnetic capacitor 27 connected in series to both ends of the antenna 25; the RF input 26 of the relay 261 is connected to the field programmable gate array cell, the radio frequency output terminal of relay 26 each contacts 262 are non-magnetic and the capacitor 27 in parallel with each; each of said field programmable gate array unit 233 according to the parameter information for the further measurement mode generates switching control signals to control the RF output of the relay 26 in the contact 262 is closed or opened, so that the respective non-magnetic capacitor 27 is connected to the antenna 25 ends.

[0107] 下面结合图5介绍该天线调谐电路的工作原理。 [0107] FIG. 5 described below with reference to the working principle of the antenna tuning circuit.

[0108] 如图5所示,该电路中射频继电器26的输出端包括多个触点262,各触点262可以为常开触点或者常闭触点,射频继电器26的输入端可接收现场可编程门阵列单元233生成的开关控制信号,射频继电器26根据接收到的不同开关控制信号可控制不同的触点262的断开或闭合,当某一触点262闭合时,与该触点262并联的无磁电容27将被短接,当某一触点262断开时,与该触点262并联的无磁电容27将连接于天线25的两端,因此,通过控制各触点262的闭合或断开状态,可将不同的无磁电容27连接于天线25两端。 [0108] As shown in FIG. 5, the output terminal of the radio relay circuit 26 includes a plurality of contacts 262, the contacts 262 may be a normally open contact or normally closed contact, the RF relay input terminal 26 may receive live programmable gate array unit 233 generates switching control signals, a radio frequency relay 26 may control a different opening or closing the contacts 262 according to the received control signals to different switches, when a contact 262 is closed, the contact 262 non-magnetic parallel capacitor 27 is shorted, when a contact 262 is disconnected, 262 in parallel with the non-contact magnetic capacitor 27 connected to both ends of the antenna 25, Thus, by controlling the contacts 262 closing or opening state, different non-magnetic capacitor 27 is connected to the ends of the antenna 25.

[0109] 天线用于接收回波信号,其等效电路包括串联的电感、电阻和与该电感和电阻并联的电容,对于不同类型的被测样品来说,其产生的回波信号的频率也不同,当通过天线接收回波信号时,为避免回波信号的频率与天线产生谐振,可改变天线的相关参数,例如,等效电路中的电感、电阻或电容的大小。 [0109] antenna for receiving echo signals, the equivalent circuit includes a series inductance, resistance, and inductance in parallel with the resistor and capacitor, for different types of samples tested, the frequency of the echo signal which is also generated by contrast, when receiving echo signals through the antenna, the antenna frequency to avoid generating the echo resonance signal, the antenna parameters can be varied, e.g., an inductor, resistor or capacitor size of the equivalent circuit. 本实施例中的天线调谐电路的作用就在于此,通过将不同的无磁电容连接于天线两端,可改变连接于天线两端的电容值的大小,也就改变了天线的等效电路中的电容值,进而,达到避免回波信号的频率与天线产生谐振的目的。 The role of an antenna tuning circuit in the embodiment of the present lies in this embodiment, by applying different non-magnetic capacitor connected across the antenna, can change the size of the capacitance value is connected to both ends of the antenna, it also changes the equivalent circuit of the antenna the capacitance value, and further, to avoid frequency of the antenna the echo resonance signal generated object.

[0110] 图6为本发明实施例所提供的核磁共振分析仪中Q转换电路和隔离电路的结构示意图,如图5所示,该核磁共振分析仪还可以包括Q转换电路28和隔离电路29。 [0110] FIG. 6 is a schematic structural diagram of a nuclear magnetic resonance analyzer provided Q conversion circuit and an isolation circuit embodiment of the present invention, shown in Figure 5, the nuclear magnetic resonance analyzer may further include a Q conversion circuit 28 and an isolation circuit 29 .

[0111] Q转换电路28和隔离电路29分别连接于所述天线25两端; [0111] Q converter circuit 28 and an isolation circuit 29 are connected to both ends of the antenna 25;

[0112] Q转换电路28中依次连接有两个反并联的第一二极管D1、第一电阻R1、第一晶体管Q1、第二晶体管Q2、第二电阻R2和两个反并联的第二二极管D2,且所述第一晶体管Ql和第二晶体管Q2的其中一个电极均接地; The second [0112] Q conversion circuit 28 sequentially connected to two anti-parallel first diode D1, a first resistor R1, a first transistor Q1, a second transistor Q2, a second resistor R2 and two antiparallel diode D2, and the first transistor Ql and the second transistor Q2 of one of the electrodes are grounded;

[0113] 隔离电路29包括依次连接有第一开关管K1、第三晶体管Q3、第四晶体管Q4和第二开关管K2,所述第三晶体管Q3和第四晶体管Q4的其中一个电极均接地; [0113] The isolation circuit 29 includes a first switch connected in this order K1, the third transistor Q3, a fourth transistor Q4 and a second switch K2, the third transistor Q3 and the fourth transistor Q4 of one of the electrodes are grounded;

[0114] 所述第一晶体管Q1、第二晶体管Q2、第一开关管K1、第三晶体管Q3、第四晶体管Q4 和第二开关管K2分别与所述现场可编程门阵列单元相连; [0114] The first transistor Q1, a second transistor Q2, a first switch K1, the third transistor Q3, a fourth transistor Q4 and the second switching transistor K2 are connected to the field programmable gate array cell;

[0115] 其中,所述现场可编程门阵列单元还用于根据所述测量模式的参数信息生成转换控制信号,以控制所述第一晶体管Q1、第二晶体管Q2、第一开关管K1、第三晶体管Q3、第四晶体管Q4和第二开关管K2按照设定顺序导通或关断; [0115] wherein said field programmable gate array control unit is further configured to generate conversion information of the measurement mode according to the parameter signal, to control the first transistor Q1, a second transistor Q2, a first switch K1, the first third transistor Q3, and a fourth transistor Q4 is set in accordance with a second switch K2 are sequentially turned on or off;

[0116] 在所述其中一第一二极管Dl、第一晶体管Ql、第二晶体管Q2和其中一第二二极管D2均导通状态下,第一电阻Rl和第二电阻R2并联与所述天线25的两端;在所述第一开关管K1、第三晶体管Q3、第四晶体管Q4和第二开关管K2均导通状态下,所述第一开关管K1、 第三晶体管Q3、第四晶体管Q4和第二开关管K2的导通电阻串联后并联于所述天线25两端。 The [0116] wherein one of said first diode Dl, Ql, the first transistor, wherein a second transistor Q2 and second diode D2 are turned on state, a first resistor Rl and the second resistor R2 in parallel the ends of the antenna 25; the first switch K1, the third transistor Q3, a fourth transistor Q4 and a second switch K2 are turned on under the state, the first switch K1, the third transistor Q3 , the fourth transistor connected in parallel to both ends of the antenna 25 and the second switch K2 Q4 oN resistance in series.

[0117] 上述的第一晶体管、第二晶体管、第三晶体管和第四晶体管可为三极管、MOS管等晶体管,第一开关管和第二开关管可以为由两个或多个三极管或MOS管等晶体管组成的开关电路,第一晶体管、第二晶体管、第三晶体管、第四晶体管、第一开关管和第二开关管可在转换控制信号控制下按照设定顺序导通或关断。 [0117] The first transistor, second transistor, a third transistor and a fourth transistor may be a transistor, a transistor such as MOS transistor, a first switch and the second switch may be formed from two or more transistors or MOS transistors other switching transistor circuit composed of the first transistor, a second transistor, a third transistor, a fourth transistor, a first switch and the second switch may be set in accordance with the sequentially turned on or off in the transition control signal.

[0118] 本实施例中,进一步的设置有Q转换电路和隔离电路,下面结合图6介绍两个电路的工作原理。 [0118] The present embodiment is further provided with a conversion circuit and an isolation circuit Q, in conjunction with FIG. 6 below describes the working principle of the two circuits.

[0119] 在通过天线采集回波信号时,需要首先激励天线使天线产生射频场,使被测样品发生核磁共振,然后,再通过天线采集被测样品核磁共振后产生的回波信号,对天线进行激励产生射频场后,天线中产生的射频场能量会呈指数形式衰减,理想的情况是,等天线中的射频场能量衰减到零后,再通过天线采集回波信号的效果最好,避免天线中还剩余部分能量的情况下影响对回波信号的接收。 [0119] When the echo signal is acquired via an antenna, the antenna need to excite the antenna generates a radio frequency field, magnetic resonance occurs so that the test sample, and then, after the echo signals collected test sample nuclear magnetic resonance and then through the antenna, antenna after generating a radio frequency excitation field, radiofrequency energy generated in the antenna field exponentially decays, ideally, the antenna and other RF field is attenuated to the zero, and then the echo signals collected by antenna best to avoid Effect of the received echo signals is also a case where the antennas of the remaining portion of the energy.

[0120] 实际中,天线中的射频场能量衰减到零或很小需要一定的时间,记为第一时间,该第一时间通常为若干微秒,从天线产生射频场至产生回波信号的间隔时间通常也有几微秒,该间隔时间记为第二时间,为保证天线采集到质量较好的回波信号,通常情况下,通过对天线参数的选择可使第一时间小于第二时间。 [0120] In practice, antenna RF field is attenuated to zero or very small take some time, referred to as a first time, the first time is typically several microseconds, to produce a radio frequency field generated from the antenna the echo signals intervals usually have a few microseconds, the second time interval is referred to, in order to ensure better quality antenna to collect echo signals, usually, by the choice of antenna parameters may cause the first time is less than a second time.

[0121 ] 本实施例中Q转换电路的作用可起到减小上述第一时间的作用,如图6所示,天线25的等效电路包括串联的电感L、电阻r和与该电感L和电阻r并联的电容C。 [0121] In the present embodiment role Q conversion circuit may function to reduce the embodiment of the first time, as shown, the antenna equivalent circuit 25 includes a series inductance L, the resistance r and an inductance 6 L and parallel capacitor C. the resistor r

1[0122]当激励天线25产生使被测样品核磁共振的射频场后,此时,可控制使第一晶体管Ql和第二晶体管Q2导通,天线25中射频场能量在衰减过程中,将产生振荡电压,该振荡电压为正弦波形式的电压信号,当天线25中剩余能量较大时,该振荡电压大于第一二极管Dl 和第二二极管D2的导通电压,两第一二极管Dl分别在正弦波的正半周期和负半周期交替导通,两第二二极管D2也分别在正弦波的正半周期和负半周期交替导通,第一电阻Rl和第二电阻R2将被并联于天线25的两端,天线25的品质因数Q将减小,天线中25的射频场能量可经第一电阻Rl和第一晶体管Ql流入大地,或者经第二电阻R2和第二晶体管Q2流入大地,因此,可在很短时间内泄放掉天线25中的大部分能量。 1 [0122] When generating the excitation antenna 25 for RF fields of the MRI test sample, at this time, the first transistor Ql may be controlled and the second transistor Q2 is turned on, the antenna 25 in the RF field energy attenuation process, generating an oscillating voltage, the oscillating voltage is a sine wave voltage signal, when the antenna 25 is greater residual energy, the oscillating voltage is larger than the first diode Dl is turned on and the voltage of the second diode D2, the first two diode Dl are alternately turned on in the positive half cycle of the sine wave and a negative half cycle, two second diode D2 is also turned on are alternately positive half cycle of the sine wave and the negative half cycles, a first resistor Rl and two resistor R2 are connected in parallel at both ends of the antenna 25, the quality factor Q of the antenna 25 is reduced, the antenna 25 may be a radio frequency field energy into the earth via a first resistor and the first transistor Ql, Rl, or via a second resistor R2 and a second transistor Q2 into the earth, therefore, most of the energy in a very short period of time can be exhausting antenna 25.

[0123] 当天线25中的剩余能量已经衰减到较小的状态时,天线25产生的振荡电压将小于第一二极管Dl和第二二极管D2的导通电压,第一二极管Dl和第二二极管D2将关断,该Q转换电路28处于开路状态,天线25中的能量不能再经第一电阻Rl和第一晶体管Ql流入大地,或者经第二电阻R2和第二晶体管Q2流入大地。 [0123] When the antenna 25 of the remaining energy has been attenuated to a lesser state, the antenna 25 produces an oscillating voltage will be less than the ON voltage of the first diode Dl and the second diode D2, the first diode Dl and the second diode D2 is turned off, the Q conversion circuit 28 in an open state, the energy can not flow into the earth antenna 25 via a first resistor and the first transistor Ql, Rl, or via a second resistor R2 and a second transistor Q2 into the earth. 此时,可控制第一开关管K1、第三晶体管Q3、第四晶体管Q4和第二开关管K2导通,该第一开关管K1、第三晶体管Q3、第四晶体管Q4和第二开关管K2导通后形成的导通电阻串联后并联在天线25的两端,该导通电阻与第一电阻Rl和第二电阻R2的阻值相比要小的多,因此,天线25的品质因数进一步减小,天线25中剩余的小部分能量,可经第一开关管Kl和第三晶体管Q3流入大地,或者,经第二开关管K2和第四晶体管Q4流入大地,可快速泄放掉天线25中剩余的小部分能量。 In this case, a first controlled switch K1, the third transistor Q3, a fourth transistor Q4 and a second switch K2 is turned on, the first switch K1, the third transistor Q3, a fourth transistor Q4 and the second switching transistor after serial resistors K2 formed after conducting the antenna 25 is connected in parallel, the on-resistance is much smaller compared to the resistance of the first resistor Rl and the second resistor R2, and therefore, the quality factor of the antenna 25 is further reduced, the antenna 25 remaining small portion of the energy, may Q3 via the first into the ground and a third transistor switch Kl, or via a second switch K2 and the fourth transistor Q4 into the earth, the antenna can be quickly exhausting 25, the remaining small portion of the energy.

[0124] 并且,在产生射频脉冲信号和上述泄放天线中大部分能量过程中,控制第一开关管K1、第三晶体管Q3、第四晶体管Q4和第二开关管K2关断,以避免高压射频脉冲信号进入连接于天线25后端的第一差分驱动器、仪用放大器、第二放大器等电路中。 [0124] Further, in the pulse generating signal and the RF antenna bleed during most of the energy, a first control switch K1, the third transistor Q3, a fourth transistor Q4 and a second switch K2 is turned off, to avoid high pressure RF pulse signals into the rear end of the antenna 25 is connected to a first differential driver instrumentation amplifier, a second amplifier circuit. 而在接收回波信号期间,控制第一开关管Kl和第二开关管K2导通,以使天线25采集的回波信号进入连接于天线25后端的第一差分驱动器、仪用放大器、第二放大器等电路中,以对该回波信号进行进一步的放大、滤波等处理。 During the receive echo signals for controlling the first switch and the second switch Kl K2 is turned on, so that the echo signals collected into the antenna 25 is connected to the rear end of the antenna 25 of the first differential driver instrument amplifier, a second amplifier circuit, the echo signal to the further amplification and filtering process.

[0125] 由上述描述可知,上述的Q转换电路可起到分阶段快速泄放天线中射频场能量的作用,使天线更好的接收回波信号,并且,可减小天线采集各回波信号之间的时间间隔,提高采集信号的效率。 [0125] From the above description, the above-described converting circuit Q may act quickly bleed phased RF field of the antenna, the better the antenna receiving echo signals, and the antenna can be reduced acquisition of each echo signal the time interval between improve the efficiency of signal acquisition. 上述的隔离电路可将高压射频脉冲信号与后级电路隔离,避免高压射频脉冲信号对后级电路的干扰。 The above-described high-voltage isolation circuit RF pulse signal and the rear-stage circuit isolation, to avoid interference on the high-pressure pulse signal after the RF stage circuit.

[0126] 最后应说明的是:以上实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。 [0126] Finally, it should be noted that: the above embodiments are intended to illustrate the present invention, rather than limiting;. Although the present invention has been described in detail embodiments, those of ordinary skill in the art should be understood: may still be made to the technical solutions described in each embodiment of the modified or part of the technical features equivalents; as such modifications or replacements do not cause the essence of corresponding technical solutions to depart from the technical solutions of the embodiments of the present invention and scope.

Claims (10)

1. 一种核磁共振分析仪滑台,其特征在于,包括:主框架,所述主框架上设置有无磁平台,所述无磁平台用于放置核磁共振分析仪的磁体箱体;样品支架,固定连接于所述无磁平台上,所述样品支架用于放置被测样品;驱动机构,设置于所述主框架上,所述驱动机构与核磁共振分析仪的磁体箱体相连,所述驱动机构用于驱动所述核磁共振分析仪的磁体箱体的移动以改变核磁共振分析仪的磁体箱体与被测样品的相对位置。 An NMR analyzer slider, characterized by comprising: a main frame, provided on the presence or absence of a magnetic internet main frame, the non-magnetic platform for placing a nuclear magnetic resonance analyzer magnet casing; Sample holder , fixedly connected to the non-magnetic platform on the sample holder for placing a test sample; a drive mechanism disposed on the main frame, said drive magnet means and housing a nuclear magnetic resonance analyzer is connected to the a drive mechanism for driving movement of the magnet housing nuclear magnetic resonance analyzer to vary the relative position of the magnet housing a nuclear magnetic resonance analyzer with the sample under test.
2.根据权利要求I所述的核磁共振分析仪滑台,其特征在于,所述驱动机构包括:第一皮带轮和第二皮带轮,分别设置于所述无磁平台上,所述第一皮带轮和第二皮带轮之间设置有传送带,所述传送带与核磁共振分析仪的磁体箱体相连,且所述核磁共振仪的磁体箱体与所述无磁平台滑动连接;电机驱动器,与步进电机相连,用于生成对步进电机的控制脉冲信号;步进电机,所述步进电机的转轴与所述第二皮带轮相连,所述步进电机的转轴根据所述控制脉冲信号转动设定角度,以驱动所述第二皮带轮带动所述传送带转动,从而带动核磁共振分析仪的磁体箱体在所述无磁平台上滑动。 According to claim I of the nuclear magnetic resonance analyzer slide, characterized in that the drive mechanism comprises: first and second pulleys respectively provided on the non-magnetic platform, said first pulley and there is provided between the second belt pulley, the belt is connected to the magnet housing and nuclear magnetic resonance analyzer, nuclear magnetic resonance and the magnet housing and slidably connected to the non-magnetic platform; connected to a motor driver, a stepper motor for generating a control pulse signal to the stepping motor; stepper motor coupled to the shaft of the stepping motor and the second pulley rotary shaft of the stepper motor rotation angle is set according to the control pulse signal, to drive the second belt pulley drives the rotation, so as to drive a nuclear magnetic resonance analyzer magnet housing slides on the non-magnetic platform.
3.根据权利要求I或2所述的核磁共振分析仪滑台,其特征在于:所述样品支架包括两个为H型支架,两所述H型支架相隔预设距离分别设置于所述无磁平台上;其中,各所述H型支架包括一水平横梁和两个垂直支撑杆,两所述垂直支撑杆底部分别固接于所述无磁平台上,所述水平横梁两端分别固接于各垂直支撑杆上,被测样品架设于两所述H型支架的水平横梁上。 According to claim I or claim 2 nuclear magnetic resonance analyzer slider, wherein: said sample holder comprises two stent is H, the two H-shaped bracket spaced apart a predetermined distance are provided on the free magnetic platform; wherein each of said H-shaped bracket comprising a horizontal cross member and two vertical support, the bottom of two vertical support rods respectively fixed to the upper non-magnetic platform, the two ends of the horizontal beams are respectively fixed on each vertical support, the test sample is stretched between the two H-shaped horizontal cross member bracket.
4.根据权利要求I或2所述的核磁共振分析仪滑台,其特征在于:所述主框架包括至少一个支撑腿,所述无磁平台固接于所述支撑腿上;所述支撑腿下部设置有水平面板,所述水平面板用于放置核磁共振分析仪中上位机、 主控电路和电子处理电路;所述电机驱动器固接于所述无磁平台的底部壁面上。 According to claim I or claim 2 nuclear magnetic resonance analyzer slider, characterized in that: said main frame includes at least one support leg, the non-magnetic platform fixed to the support leg; said support leg a lower portion provided with a horizontal panel, the horizontal panel for placing a nuclear magnetic resonance analyzer host computer, main control circuit and the electronic processing circuit; said drive motor fixed to the bottom wall surface of the non-magnetic platform.
5. 一种核磁共振分析仪,包括玻璃钢管、磁体和天线,其特征在于:还包括权利要求1-4任一所述的滑台;其中,所述天线缠绕于玻璃钢管外表面,所述天线相对于所述磁体固定设置,且置于所述磁体产生的磁场中;所述天线、玻璃钢管和磁体均设置于磁体箱体内,所述磁体箱体放置于所述滑台的无磁平台上,被测样品穿过所述玻璃钢管且放置于样品支架上。 A nuclear magnetic resonance analyzer, comprising a glass pipe, magnets and antennas, characterized by: further comprising a slide table according to any of claims 1-4; wherein the antenna is wound around the outer surface of the glass pipe, the the antenna is fixed relative to the magnet, the magnet and placed in a magnetic field generated; the antenna, the glass tube and the magnets are disposed in the magnet housing, the magnet housing disposed on the non-magnetic slider platform on the test sample through the glass tube and placed on a sample holder.
6.根据权利要求5所述核磁共振分析仪,其特征在于,还包括:上位机,用于设置测量模式的参数信息以传送给主控电路,并对主控电路传送的回波的幅值和相位信息进行解析,以得到被测样品中的流体信息和孔隙信息;主控电路,与所述上位机相连,用于根据所述测量模式的参数信息生成步进控制信号以传送给电机驱动器,以控制所述电机驱动器根据所述步进控制信号生成对步进电机的控制脉冲信号,且生成激励信号以传送给电子处理线路,并将接收到的电子处理电路处理后的回波信号转换成数字信号以得到回波的幅值和相位信息后传送给上位机;电子处理电路,分别与所述主控电路和天线相连,用于根据接收到的激励信号生成射频脉冲信号以激励天线产生使被测样品核磁共振的射频场,并接收天线采集的被测样品核磁共振后产生的回波信号,以 According to claim 5, wherein the nuclear magnetic resonance analyzer, characterized by further comprising: a host computer, the parameters for setting the measurement mode information to transmit to the main control circuit, and the amplitude of the echo of the master transmission circuit and phase information is parsed to obtain a test sample fluid information and the information of the pores; the main control circuit, coupled to said host computer, the parameters for the control information generation step signal to transmit the measurement mode according to the motor driver , to control the stepping motor driver according to the control signal to generate a control pulse signal to the stepping motor, and generates excitation signals to the echo signal to the electronic processing circuit, and electronic processing circuit processing the received conversion into a digital signal to obtain the amplitude and phase of the echo information is transferred to the host computer; electronic processing circuit, respectively connected to the main control circuit and an antenna, for generating an excitation signal in accordance with the received signal to generate radio frequency pulses to excite the antenna echo signals RF field causes the test sample nuclear magnetic resonance, and nuclear magnetic resonance of the antenna receiving the test sample after collection, to 所述回波信号进行处理后传送给主控电路。 The echo signal is transmitted to the main control circuit after processing.
7.根据权利要求6所述核磁共振分析仪,其特征在于,所述电子处理电路包括:数模转换器,与所述主控电路相连,用于将主控电路生成的激励信号转换成模拟电信号以传送给光耦隔离器;光耦隔离器,连接于所述数模转换器和晶体管驱动器之间,用于将数模转换器与晶体管驱动器光电隔离;隔离变压器,所述隔离变压器的一次侧与晶体管驱动器相连,所述隔离变压器的二次侧与晶体管电路相连,用于将晶体管驱动器与晶体管电路电气隔离;晶体管驱动器,与晶体管电路相连,用于将光耦隔离器输出的模拟电信号进行放大以生成驱动控制信号,并经隔离变压器的二次侧输出;直流电源模块,与晶体管电路相连,用于为晶体管电路提供直流电压;晶体管电路,与天线相连,用于根据驱动控制信号将直流电压斩波成方波形式的射频脉冲信号以激励天线产 7. The nuclear magnetic resonance analyzer according to claim 6, characterized in that said electronic processing circuit comprising: a digital to analog converter connected to the control circuit, the main control circuit for converting into an analog signal generated by the excitation electrical signal transmission to optical isolators; optocouplers, digital to analog converter connected between the transistor and the driver for the digital to analog converter with optical isolation transistor driver; an isolation transformer, the isolation transformer is connected to the primary side of the drive transistor is connected to the secondary side of the isolation transformer and transistor circuit, the transistor driver for the transistor circuit electrically isolated; drive transistor connected to the transistor circuit for the opto-isolated analog output signal is amplified to generate a driving control signal, and outputs the secondary side of the isolation transformer; DC power supply module, coupled with a transistor circuit for providing a DC voltage to a transistor circuit; a transistor circuit coupled to an antenna, in accordance with a control signal for driving in the form of a DC voltage square wave chopper signal RF pulse to excite the antenna yield 使被测样品发生核磁共振的射频场;第一差分驱动器,与天线相连,用于将天线采集的被测样品生成的回波信号转换成两路差分回波信号;仪用放大器,通过屏蔽双绞线与所述第一差分驱动器相连,通过屏蔽双绞线将所述两路差分回波信号传输给所述仪用放大器,以通过仪用放大器将所述两路差分回波信号放大第一设定倍数后输出一路回波信号;第二级放大器,与所述仪用放大器相连,用于将所述移动放大器输出的回波信号放大第二设定倍数后输出;程控衰减器,与所述第二级放大器相连,用于将所述第二级放大器输出的回波信号衰减设定量后输出;两级放大器,与所述程控衰减器相连,用于将所述程控衰减器输出的回波信号放大第三设定倍数后输出;带通滤波器,与所述两级放大器相连,用于抑制所述两级放大器输出的回波信号中设定频率的 NMR RF field so that the test sample occurs; a first differential driver, and an antenna connected to the antenna for converting the test sample collected echo signals generated echo signal into two differential; instrumentation amplifier, shielded by the first differential drive wire is connected, through the two shielded twisted pair differential signal to said echo instrumentation amplifier, to the instrument through the two differential amplifier amplifies the echo signal of the first after setting multiple output one echo signal; and a second stage amplifier connected to said amplifier device for amplifying the echo signal output from the output amplifier of the mobile after a second predetermined multiple; programmable attenuator, and the coupled to said second stage amplifier, for outputting a set amount attenuated echo signal outputted from said second amplifier stage; two-stage amplifier, connected to the programmable attenuator for the output from the programmable attenuator outputs the amplified echo signal a third predetermined multiple; band-pass filter, connected to the two-stage amplifier, for suppressing an echo signal of the two amplifier output frequency set 号分量;第二差分驱动器,与所述带通滤波器相连,用于将所述带通滤波器输出的回波信号转换成两路差分回波信号;差分接收器,通过屏蔽双绞线与所述第二差分驱动器相连,用于将所述第二差分驱动器输出的两路差分回波信号变换成一路回波信号;抗混叠滤波器,与所述差分接收器相连,用于过滤所述差分接收器输出的回波信号中的谐波信号以传送给主控电路。 Signal component; a second differential driver coupled to said band pass filter, for converting the output of said bandpass filter echo signal into two differential echo signals; differential receiver by shielded twisted pair coupled to said second differential driver for converting said two differential echo signal output from the second differential drive all the way into echo signals; anti-aliasing filter, coupled to said differential receiver, for filtering the harmonic signal of said echo signal output from the differential receiver to transmit to the master circuit.
8.根据权利要求7所述核磁共振分析仪,其特征在于,所述主控电路包括:模数转换驱动器,与所述抗混叠滤波器相连,用于将所述抗混叠滤波器输出的回波信号转换成设定频率和幅值的模拟电压信号后输出;模数转换器,与所述模数转换驱动器相连,用于将模数转换驱动器输出的模拟电压信号转换成数字信号后输出;现场可编程门阵列单元,与所述模数转换器相连,用于将模数转换器输出的数字信号进行缓存,且根据经过数字信号处理器解码后的测量模式的参数信息生成步进控制信号以传送给电机驱动器,以控制所述电机驱动器根据所述步进控制信号生成对步进电机的控制脉冲信号,并生成激励信号以传送给所述数模转换器;数字信号处理器,与所述现场可编程门阵列单元和数模转换器相连,用于对所述测量模式的参数信息进行解码,并生成回波 According to claim 7 nuclear magnetic resonance analyzer, wherein said control circuit comprising: analog to digital converter drive, coupled with the anti-aliasing filter for the output anti-aliasing filter after analog to digital converter analog to digital converter connected to the driver for the analog voltage signal into a digital signal to analog to digital converter output drive; echo signal is output to set a frequency and amplitude converted analog voltage signal output; field programmable gate array means, coupled to said analog to digital converter for converting the digital signal output of the ADC is cached, and according to the parameter information generation step, after the digital signal processor decodes measurement mode to transmit a control signal to the motor driver to control the motor driver control signal according to the control pulse signal generating step of the stepping motor, and generating an excitation signal for transmission to the digital to analog converter; digital signal processor, with the field programmable gate array and a digital unit connected to said parameter information for decoding the measurement mode, and generates an echo 据读取信号以读取所述现场可编程门阵列单元中存储的数字信号并根据预设算法得到回波的幅值和相位信息以传送给上位机。 According to the read signal to read the digital signals of the field programmable gate array in the storage unit and amplitude and phase obtained in accordance with preset algorithm echo information to transmit to the host computer.
9.根据权利要求8所述核磁共振分析仪,其特征在于,还包括:天线调谐电路,所述天线调谐电路包括射频继电器和多个无磁电容;其中,各无磁电容串联后连接于所述天线两端;所述射频继电器的输入端与所述现场可编程门阵列单元相连,所述射频继电器中输出端的各触点分别与各所述无磁电容并联;所述现场可编程门阵列单元还用于根据所述测量模式的参数信息生成开关控制信号, 以控制所述射频继电器中输出端的各触点的闭合或断开,从而将相应无磁电容连接于所述天线两端。 9. The method of claim 8 nuclear magnetic resonance analyzer, characterized by further comprising: an antenna tuning circuit, said tuning circuit comprises a radio frequency antenna and a plurality of non-magnetic relays capacitors; wherein each of the non-magnetic capacitor connected in series to the said ends of the antenna; the RF relay input terminal connected to the field programmable gate array means, each of the radio frequency contact and a non-magnetic capacitor in parallel with each of the relay output terminal, respectively; the field programmable gate array the unit is further configured to parameter information of the measurement mode generates a switch control signal to control the contacts of the radio frequency output of the relay to close or open, so that the respective non-magnetic capacitor is connected to the antenna ends.
10.根据权利要求8或9所述核磁共振分析仪,其特征在于,还包括Q转换电路和隔离电路,所述Q转换电路和隔离电路分别连接于所述天线两端;所述Q转换电路中依次连接有两个反并联的第一二极管、第一电阻、第一晶体管、第二晶体管、第二电阻和两个反并联的第二二极管,且所述第一晶体管和第二晶体管的其中一个电极均分别接地;所述隔离电路包括依次连接有第一开关管、第三晶体管、第四晶体管和第二开关管,所述三晶体管和第四晶体管的其中一个电极均接地;所述第一晶体管、第二晶体管、第一开关管、第三晶体管、第四晶体管和第二开关管分别与所述现场可编程门阵列单元相连;其中,所述现场可编程门阵列单元还用于根据所述测量模式的参数信息生成转换控制信号,以控制所述第一晶体管、第二晶体管、第一开关管、第三晶体管、第四 According to claim 8 or 9 nuclear magnetic resonance analyzer, characterized by further comprising a conversion circuit and an isolation circuit Q, said Q conversion circuit and an isolation circuit are connected to both ends of the antenna; said Q converter circuit sequentially connecting two first diodes antiparallel, a first resistor, a first transistor, a second transistor, a second resistor and two antiparallel diodes of the second and the first transistor and the second wherein one electrode of the second transistor are grounded, respectively; the isolation circuit comprises a first switch connected in this order, a third transistor, a fourth transistor and a second switching transistor, wherein one electrode of the third transistor and the fourth transistor are grounded ; the first transistor, a second transistor, a first switching transistor, the third transistor, the fourth transistor and the second switch are respectively connected to the field programmable gate array unit; wherein the field programmable gate array unit also used to generate switching control signal according to parameter information of the measurement mode to control the first transistor, a second transistor, a first switching transistor, a third transistor, a fourth 体管和第二开关管按照设定顺序导通或关断;在所述其中一第一二极管、第一晶体管、第二晶体管和其中一第二二极管均导通状态下,第一电阻和第二电阻并联与所述天线的两端;在所述第一开关管、第三晶体管、第四晶体管和第二开关管均导通状态下,所述第一开关管、第三晶体管、第四晶体管和第二开关管的导通电阻串联后并联于所述天线两端。 And a second transistor switch tube according to a set sequentially turned on or off; in one of said first diode, a first transistor, a second transistor, and wherein the second diode are turned on state, the first both ends of a resistor and a second resistor connected in parallel with the antenna; in the first switching transistor, the third transistor, the fourth transistor and the second switch are turned on state, the first switching transistor, the third oN resistance of the transistor, the fourth transistor and the second switch transistor connected in parallel to the series connection of the two ends of the antenna.
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