CN107612412A - A kind of gas neutron detector high-low pressure Pulased power supply unit and its control method - Google Patents
A kind of gas neutron detector high-low pressure Pulased power supply unit and its control method Download PDFInfo
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Abstract
本发明公开一种气体中子探测器用高低脉冲电源及其控制方法,由同步脉冲信号控制高低压脉冲的频率和占空比,在直流高压电源和直流低压电源之间接入一个半桥式控制电路,通过半桥式高压MOS管的上桥臂和下桥臂交替导通的方式来实现脉冲高压低输出。当同步脉冲为高电平时,直流高压电源为气体中子探测器供电;当同步脉冲为低电平时,直流低压电源为气体中子探测器供电,此时可防止因中子通量过大导致气体探测器饱和。输出高压脉冲占空比在0%~90%之间连续可调、输出高压脉冲频率可以在1Hz~2KHz连续可调、输出高压脉冲上升/下降沿宽度小于1μs,非常适合利用气体中子探测器进行脉冲中子测井领域的中子探测。
The invention discloses a high-low pulse power supply for a gas neutron detector and a control method thereof. The frequency and duty ratio of the high-low voltage pulse are controlled by a synchronous pulse signal, and a half-bridge control circuit is connected between the DC high-voltage power supply and the DC low-voltage power supply. , the pulse high voltage and low output is realized by alternately conducting the upper bridge arm and the lower bridge arm of the half-bridge high-voltage MOS transistor. When the synchronization pulse is at high level, the DC high-voltage power supply supplies power to the gas neutron detector; when the synchronization pulse is at low level, the DC low-voltage power supply supplies power to the gas neutron detector. The gas detector is saturated. The output high voltage pulse duty cycle is continuously adjustable between 0% and 90%, the output high voltage pulse frequency can be continuously adjusted between 1Hz and 2KHz, and the output high voltage pulse rising/falling edge width is less than 1μs, which is very suitable for gas neutron detectors Perform neutron detection in the field of pulsed neutron logging.
Description
技术领域technical field
本发明涉及一种气体中子探测器用高低压脉冲电源,特别是一种气体中子探测器用高低压脉冲电源及其控制方法,适用于脉冲中子测井领域的中子探测。The invention relates to a high and low voltage pulse power supply for a gas neutron detector, in particular to a high and low voltage pulse power supply for a gas neutron detector and a control method thereof, which is suitable for neutron detection in the field of pulse neutron logging.
背景技术Background technique
脉冲中子测井是指脉冲中子源每隔一定时间发射一定宽度的快中子,照射地层,通过研究中子与地层的相互作用来研究地层。目前该方法主要应用于石油和铀矿勘探与开采行业。中子探测是脉冲中子测井领域的一个重要组成部分,由于中子不带电,不能直接引起物质的“电离”与“激发”,对中子的探测主要通过对它与物质作用产生的次级带电粒子的探测而实现,目前应用较为广泛的中子探测器为3He正比计数管。3He正比计数管通过3He气体与中子进行核反应产生带电粒子——质子与氚核,质子与氚核与3He气体发生电离碰撞,使3He气体分子电离,形成大量的离子对(电子和正离子)。在外加电场的作用下,这些电子和正离子分别向正电极(中心阳极丝)和负电极(金属管壳)漂移。电子愈接近阳极,电场强度越强,电子获得的能量足以与气体原子发生电离碰撞,形成新的离子对。同样新的电子再次被加速并发生新的电离碰撞,越接近阳极,碰撞几率越大,进而产生雪崩效应,雪崩后的离子对数目大量增多,形成信号的放大,得到与入射中子能量对应的脉冲信号。然而因为雪崩只发生在阳极丝周围狭小的范围内,当输入中子通量过大,导致阳极丝周围的气体全部处于电离状态,进而导致探测器饱和,无法输出脉冲信号。Pulse neutron logging means that the pulse neutron source emits fast neutrons of a certain width at regular intervals, irradiates the formation, and studies the formation by studying the interaction between neutrons and the formation. At present, the method is mainly used in petroleum and uranium exploration and mining industries. Neutron detection is an important part of the field of pulsed neutron logging. Since neutrons are not charged, they cannot directly cause the "ionization" and "excitation" of matter. The detection of neutrons is mainly through the secondary It is realized by the detection of supercharged particles. At present, the widely used neutron detector is 3 He proportional counter tube. The 3 He proportional counter generates charged particles through the nuclear reaction between the 3 He gas and neutrons—protons and tritons, and the protons and tritons collide with the 3 He gas to ionize the 3 He gas molecules and form a large number of ion pairs (electrons and positive ions). Under the action of an applied electric field, these electrons and positive ions drift to the positive electrode (central anode wire) and negative electrode (metal shell) respectively. The closer the electrons are to the anode, the stronger the electric field, and the energy obtained by the electrons is enough to ionize and collide with the gas atoms to form new ion pairs. Similarly, new electrons are accelerated again and undergo new ionization collisions. The closer they are to the anode, the greater the probability of collisions, which in turn produces an avalanche effect. Pulse signal. However, because the avalanche only occurs in a narrow range around the anode wire, when the input neutron flux is too large, all the gas around the anode wire will be in an ionized state, which will cause the detector to saturate and fail to output pulse signals.
气体正比计数管的雪崩效应与探测器内部的气体压强、工作电压、电极(阳极丝、金属管壳)半径有关,在仪器系统的工作过程中,中子探测器的气体压强、电极半径参数基本无法改变,为了避免因中子通量过大而导致的探测器饱和,可通过降低其工作电压来实现。比如在脉冲中子测井过程中,当发射源中子的时间段内,将3He中子探测器的工作电压降低到工作坪区以下,避免因过度的雪崩效应导致探测器饱和,而引起的探测器短暂失效现象;当源中子脉冲时间段过后,再将探测器的工作电压回升到正常的工作坪区。能够适用于这种情况的工作电源目前尚未见报道,本发明所述的气体中子探测用高低压脉冲电源及其控制方法即可完成该功能,能够很好地适用于脉冲中子通量较大情况下的中子测井系统。The avalanche effect of the gas proportional counter tube is related to the gas pressure inside the detector, the working voltage, and the radius of the electrode (anode wire, metal shell). During the working process of the instrument system, the gas pressure and electrode radius parameters of the neutron detector are basically It cannot be changed, in order to avoid saturation of the detector due to excessive neutron flux, it can be realized by reducing its operating voltage. For example, in the process of pulsed neutron logging, during the time period when the source neutrons are emitted, the working voltage of the 3 He neutron detector is lowered below the working plateau to avoid saturation of the detector due to excessive avalanche effect, which may cause The short-term failure of the detector; after the source neutron pulse time period, the working voltage of the detector is raised back to the normal working plateau. The working power supply applicable to this situation has not yet been reported. The high and low voltage pulse power supply and its control method for gas neutron detection described in the present invention can complete this function, and can be well adapted to pulse neutron flux. Neutron logging system for large cases.
发明内容Contents of the invention
本发明的目在于提供一种气体中子探测器用高低脉冲电源,可由外部同步脉冲信号控制高低压脉冲的频率和占空比,防止因中子通量过大导致气体探测器饱和,适用于脉冲中子通量较大情况下的中子测井领域。本发明的另一目在于提供该气体中子探测器用高低脉冲电源的控制方法。The purpose of the present invention is to provide a high and low pulse power supply for gas neutron detectors, which can control the frequency and duty cycle of high and low voltage pulses by external synchronous pulse signals, so as to prevent the saturation of gas detectors due to excessive neutron flux, and is suitable for pulse The field of neutron logging under the condition of large neutron flux. Another object of the present invention is to provide a method for controlling the high and low pulse power supply for the gas neutron detector.
本发明的技术方案:一种气体中子探测器用高低压脉冲电源,包括CPLD控制芯片、上桥臂隔离驱动、下桥臂隔离驱动,由同步脉冲信号控制高压脉冲的频率和占空比,在直流高压电源和直流低压电源之间分别接入上下桥臂隔离驱动,通过上桥臂和下桥臂高压MOS管交替导通的方式来实现高低压脉冲输出,其中:CPLD控制芯片根据同步脉冲信号控制CPLD输出合适的时序,分别控制上桥臂隔离驱动和下桥臂隔离驱动,所述上桥臂隔离驱动包括DC-DC隔离电源、隔离光耦和上桥臂高压MOS管,所述下桥臂隔离驱动7包括DC-DC隔离电源、隔离光耦和下桥臂高压MOS管;+5V供电电源与CPLD控制芯片、上桥臂DC-DC隔离电源、下桥臂DC-DC隔离电源、直流高压电源、直流低压电源连接,上桥臂隔离光耦与CPLD控制芯片、上桥臂DC-DC隔离电源、上桥臂高压MOS管 连接,下桥臂隔离光耦 与CPLD控制芯片、下桥臂DC-DC隔离电源、下桥臂高压MOS管连接,输入直流高压电源与上桥臂高压MOS管 连接,同步脉冲信号与CPLD控制芯片 连接,高压脉冲电源输出与上桥臂高压MOS管、下桥臂高压MOS管连接,直流高压电源和直流电低电源的输出接气体中子探测器的工作电极。The technical solution of the present invention: a high-voltage and low-voltage pulse power supply for gas neutron detectors, including a CPLD control chip, an isolation drive for the upper bridge arm, and an isolation drive for the lower bridge arm. The frequency and duty cycle of the high-voltage pulse are controlled by the synchronous pulse signal. The DC high-voltage power supply and the DC low-voltage power supply are respectively connected to the isolation drive of the upper and lower bridge arms, and the high-voltage and low-voltage pulse output is realized by alternately conducting the high-voltage MOS transistors of the upper bridge arm and the lower bridge arm. Among them: CPLD control chip according to the synchronous pulse signal Control the appropriate timing of the CPLD output, respectively control the isolated drive of the upper bridge arm and the isolated drive of the lower bridge arm, the isolated drive of the upper bridge arm includes a DC-DC isolated power supply, an isolated optocoupler and a high-voltage MOS tube of the upper bridge arm, and the lower bridge arm Arm isolation driver 7 includes DC-DC isolated power supply, isolated optocoupler and lower bridge arm high-voltage MOS tube; +5V power supply and CPLD control chip, upper bridge arm DC-DC isolated power supply, lower bridge arm DC-DC isolated power supply, DC High-voltage power supply, DC low-voltage power supply connection, upper bridge arm isolation optocoupler and CPLD control chip, upper bridge arm DC-DC isolation power supply, upper bridge arm high-voltage MOS tube connection, lower bridge arm isolation optocoupler and CPLD control chip, lower bridge arm The DC-DC isolated power supply is connected to the high-voltage MOS tube of the lower bridge arm, the input DC high-voltage power supply is connected to the high-voltage MOS tube of the upper bridge arm, the synchronous pulse signal is connected to the CPLD control chip, and the output of the high-voltage pulse power supply is connected to the high-voltage MOS tube of the upper bridge arm and the lower bridge arm. The arm high-voltage MOS tube is connected, and the output of the DC high-voltage power supply and the DC low power supply is connected to the working electrode of the gas neutron detector.
所述直流高压电源和直流电低电源的型号为CC228P-13Y,输入工作电压为+12V,输出电压0~+1500V可调,直流高压电源工作于气体中子探测器的坪区电压,直流低压电源工作于气体中子探测器的坪区以下电压;所述的气体中子探测器用高低压脉冲电源,所述气体中子探测器的类型为3He正比计数管、涂硼正比计数管。The model of the DC high-voltage power supply and DC low-voltage power supply is CC228P-13Y, the input working voltage is +12V, the output voltage is adjustable from 0 to +1500V, the DC high-voltage power supply works at the plateau voltage of the gas neutron detector, and the DC low-voltage power supply Working at the voltage below the plateau of the gas neutron detector; the gas neutron detector uses a high and low voltage pulse power supply, and the type of the gas neutron detector is a 3 He proportional counter tube or a boron-coated proportional counter tube.
一种气体中子探测器用高低压脉冲电源的控制方法,其步骤:步骤一,CPLD芯片实时监测中子同步脉冲信号,当源中子到来时,该同步信号为低电平,当源中子结束后,该同步信号为高电平;当检测到同步信号的上升沿时进入步骤二,当检测到同步信号的下降沿时进入步骤三,否则进入步骤四;步骤二,设置同步脉冲标志为1,关闭下桥臂MOS管,禁止直流低压电源将气体中子探测器的工作电极拉至低电压,进入步骤五;步骤三,设置同步脉冲标志为0,关闭上桥臂MOS管,禁止直流高压电源将气体中子探测器的工作电极拉至高电压,进入步骤五;步骤四,上下桥臂MOS管保持原有状态不变,进入步骤一;步骤五,进行死区延时,防止因上下桥臂MOS管同时导通烧坏MOS管,延时时间由CPLD进行设置,若同步脉冲标志为,进入步骤六,否则进入步骤七;步骤六,打开上桥臂MOS管,使输出到气体中子探测器的工作电极的电压从低压切换到高压,确保其工作于坪区电压,提高其探测效率,进入步骤一;步骤七,打开下桥臂MOS管,使输出到气体中子探测器的工作电极的电压从低压切换到高压,确保其工作于坪区电压以下,降低其探测效率,防止探测器饱和,进入步骤一。A method for controlling a high and low voltage pulse power supply for a gas neutron detector. The steps are as follows: Step 1: The CPLD chip monitors the neutron synchronous pulse signal in real time. When the source neutron arrives, the synchronous signal is at a low level. After the end, the synchronization signal is at a high level; when the rising edge of the synchronization signal is detected, enter step 2, and when the falling edge of the synchronization signal is detected, enter step 3, otherwise enter step 4; step 2, set the synchronization pulse flag as 1. Turn off the MOS tube of the lower bridge arm, prohibit the DC low-voltage power supply from pulling the working electrode of the gas neutron detector to a low voltage, and enter step 5; step 3, set the synchronization pulse flag to 0, turn off the MOS tube of the upper bridge arm, and prohibit DC The high-voltage power supply pulls the working electrode of the gas neutron detector to a high voltage, and enters step five; step four, maintains the original state of the upper and lower bridge arm MOS tubes, and enters step one; step five, performs a dead zone delay to prevent the The bridge arm MOS tubes are turned on at the same time to burn out the MOS tubes, and the delay time is set by the CPLD. If the synchronous pulse flag is , go to step 6, otherwise go to step 7; step 6, open the upper bridge arm MOS tube to make the output into the gas The voltage of the working electrode of the sub-detector is switched from low voltage to high voltage to ensure that it works at the plateau voltage, improve its detection efficiency, and enter step 1; step 7, open the lower bridge arm MOS tube, so that the output to the gas neutron detector Switch the voltage of the working electrode from low voltage to high voltage to ensure that it works below the plateau voltage, reduce its detection efficiency, and prevent the detector from being saturated, and enter step 1.
气体中子探测器用高低压脉冲电源的控制方法,所述的同步脉冲信号由外部输入,或由DSP、ARM、FPGA/CPLD、单片机的CPU芯片根据源中子同步脉冲信号产生,该同步脉冲信号与源中子同步脉冲信号保持一致的时序,或有自己的特定时序,如上升沿与源中子触发脉冲同步,其高电平脉冲占空比根据实际需要由CPU进行设置。The control method of the high and low voltage pulse power supply for gas neutron detectors, the synchronous pulse signal is input by the outside, or is produced by the CPU chip of DSP, ARM, FPGA/CPLD, single-chip microcomputer according to the source neutron synchronous pulse signal, and the synchronous pulse signal Keep the timing consistent with the source neutron synchronization pulse signal, or have its own specific timing, such as the rising edge is synchronized with the source neutron trigger pulse, and its high-level pulse duty cycle is set by the CPU according to actual needs.
本发明的优点:具有结构简单、使用方便,由同步脉冲信号控制高低压脉冲的频率和占空比,输出高压脉冲占空比在0%~90%之间连续可调、输出高压脉冲频率可以在1Hz~2KHz连续可调、输出高压脉冲上升/下降沿宽度小于1μs,非常适合利用气体中子探测器进行脉冲中子测井领域的中子探测。The invention has the advantages of simple structure and convenient use, the frequency and duty cycle of the high and low voltage pulses are controlled by the synchronous pulse signal, the duty cycle of the output high voltage pulse is continuously adjustable between 0% and 90%, and the frequency of the output high voltage pulse can be adjusted It is continuously adjustable from 1Hz to 2KHz, and the output high-voltage pulse rising/falling edge width is less than 1μs, which is very suitable for neutron detection in the field of pulse neutron logging using gas neutron detectors.
附图说明Description of drawings
图1为本发明实施例1的系统结构示意图;FIG. 1 is a schematic diagram of the system structure of Embodiment 1 of the present invention;
图2为本发明实施例1的控制流程图;Fig. 2 is the control flowchart of embodiment 1 of the present invention;
图3为本发明实施例1的单片机芯片及其外围接口原理图;Fig. 3 is the schematic diagram of the single-chip microcomputer chip and its peripheral interface of Embodiment 1 of the present invention;
图4为本发明实施例1的CPLD控制芯片及其外围接口原理图;Fig. 4 is the CPLD control chip of embodiment 1 of the present invention and its peripheral interface schematic diagram;
图5为本发明实施例1的上桥臂隔离驱动和下桥臂隔离驱动原理图。FIG. 5 is a schematic diagram of the isolation driving of the upper bridge arm and the isolation driving of the lower bridge arm in Embodiment 1 of the present invention.
图中:+5V供电电源(1),CPLD控制芯片(2),上桥臂隔离驱动(3),上桥臂DC-DC隔离电源(4),上桥臂隔离光耦(5),上桥臂高压MOS管(6),下桥臂隔离驱动(7),下桥臂DC-DC隔离电源(8),下桥臂隔离光耦(9),下桥臂高压MOS管(10),直流高压电源(11),直流高压电源(12),同步脉冲信号(14),气体中子探测器 (13)。In the figure: +5V power supply (1), CPLD control chip (2), upper bridge arm isolation driver (3), upper bridge arm DC-DC isolation power supply (4), upper bridge arm isolation optocoupler (5), upper High-voltage MOS tube for the bridge arm (6), isolated driver for the lower bridge arm (7), DC-DC isolated power supply for the lower bridge arm (8), isolated optocoupler for the lower bridge arm (9), high-voltage MOS tube for the lower bridge arm (10), DC high voltage power supply (11), DC high voltage power supply (12), synchronous pulse signal (14), gas neutron detector (13).
具体实施方式detailed description
下面通过附图和具体实施方式对本发明作更为详细的描述。The present invention will be described in more detail through the accompanying drawings and specific embodiments below.
参见图1-图5,本气体中子探测器用高低压脉冲电源,包括CPLD控制芯片2、上桥臂隔离驱动3、下桥臂隔离驱动7,由同步脉冲信号14控制高压脉冲的频率和占空比,在直流高压电源11和直流低压电源12之间接入一个半桥式控制电路,通过上桥臂和下桥臂高压MOS管交替导通的方式来实现高低压脉冲输出,其中:CPLD控制芯片2根据同步脉冲信号14控制CPLD输出合适的时序,分别控制上桥臂隔离驱动3和下桥臂隔离驱动7,所述上桥臂隔离驱动3包括DC-DC隔离电源4、隔离光耦5和上桥臂高压MOS管6,所述下桥臂隔离驱动7包括DC-DC隔离电源8、隔离光耦9和下桥臂高压MOS管10;+5V供电电源1与CPLD控制芯片2、上桥臂DC-DC隔离电源4、下桥臂DC-DC隔离电源8、直流高压电源11、直流低压电源12连接,上桥臂隔离光耦5与CPLD控制芯片2、上桥臂DC-DC隔离电源4、上桥臂高压MOS管6 连接,下桥臂隔离光耦9 与CPLD控制芯片2、下桥臂DC-DC隔离电源8、下桥臂高压MOS管10 连接,输入直流高压电源11与上桥臂高压MOS管6 连接,同步脉冲信号14与CPLD控制芯片2 连接,高压脉冲电源输出13与上桥臂高压MOS管6、下桥臂高压MOS管10 连接,直流高压电源11和直流电低电源12的输出接气体中子探测器13的工作电极。Referring to Figures 1-5, the gas neutron detector uses a high and low voltage pulse power supply, including a CPLD control chip 2, an upper bridge arm isolation driver 3, and a lower bridge arm isolation driver 7, and the frequency and duty cycle of the high voltage pulse are controlled by a synchronous pulse signal 14. Duty ratio, a half-bridge control circuit is connected between the DC high-voltage power supply 11 and the DC low-voltage power supply 12, and the high-voltage and low-voltage pulse output is realized by alternately conducting the high-voltage MOS transistors of the upper bridge arm and the lower bridge arm, wherein: CPLD control The chip 2 controls the appropriate timing of the CPLD output according to the synchronous pulse signal 14, respectively controls the upper bridge arm isolation driver 3 and the lower bridge arm isolation driver 7, and the upper bridge arm isolation driver 3 includes a DC-DC isolated power supply 4 and an isolated optocoupler 5 and the upper bridge arm high-voltage MOS tube 6, the lower bridge arm isolation drive 7 includes a DC-DC isolated power supply 8, an isolated optocoupler 9 and a lower bridge arm high-voltage MOS tube 10; +5V power supply 1 and CPLD control chip 2, upper Bridge arm DC-DC isolation power supply 4, lower bridge arm DC-DC isolation power supply 8, DC high voltage power supply 11, DC low voltage power supply 12 connection, upper bridge arm isolation optocoupler 5 and CPLD control chip 2, upper bridge arm DC-DC isolation Power supply 4, upper bridge arm high voltage MOS tube 6 connected, lower bridge arm isolation optocoupler 9 connected with CPLD control chip 2, lower bridge arm DC-DC isolated power supply 8, lower bridge arm high voltage MOS tube 10, input DC high voltage power supply 11 and The upper bridge arm high voltage MOS tube 6 is connected, the synchronous pulse signal 14 is connected with the CPLD control chip 2, the high voltage pulse power output 13 is connected with the upper bridge arm high voltage MOS tube 6, the lower bridge arm high voltage MOS tube 10, the DC high voltage power supply 11 and the DC low voltage The output of the power supply 12 is connected to the working electrode of the gas neutron detector 13 .
进一步,所述直流高压电源11和直流电低电源12的型号为CC228P-13Y,输入工作电压为+12V,输出电压0~+1500V可调,直流高压电源11工作于气体中子探测器13的坪区电压(对应3He正比计数管为+1300V左右),直流低压电源12工作于气体中子探测器13的坪区以下电压(对应3He正比计数管为+900V左右);所述的气体中子探测器用高低压脉冲电源,其特征在于:所述气体中子探测器13的类型可为3He正比计数管、涂硼正比计数管等。Further, the model of the DC high voltage power supply 11 and the DC low power supply 12 is CC228P-13Y, the input working voltage is +12V, the output voltage is adjustable from 0 to +1500V, and the DC high voltage power supply 11 works on the plateau of the gas neutron detector 13 area voltage (corresponding to the 3 He proportional counter tube is about +1300V), the DC low-voltage power supply 12 works at the voltage below the plateau area of the gas neutron detector 13 (corresponding to the 3 He proportional counter tube is about +900V); The high and low voltage pulse power supply for the sub-detector is characterized in that: the type of the gas neutron detector 13 can be 3 He proportional counter tube, boron-coated proportional counter tube and the like.
一种气体中子探测器用高低压脉冲电源的控制方法,如图2所示,包括以下步骤:步骤一,CPLD芯片实时监测中子同步脉冲信号,当源中子到来时,该同步信号为低电平,当源中子结束后,该同步信号为高电平;当检测到同步信号的上升沿时进入步骤二,当检测到同步信号的下降沿时进入步骤三,否则进入步骤四;步骤二,设置同步脉冲标志为1,关闭下桥臂MOS管,禁止直流低压电源将气体中子探测器的工作电极拉至低电压,进入步骤五;步骤三,设置同步脉冲标志为0,关闭上桥臂MOS管,禁止直流高压电源将气体中子探测器的工作电极拉至高电压,进入步骤五;步骤四,上下桥臂MOS管保持原有状态不变,进入步骤一;步骤五,进行死区延时,防止因上下桥臂MOS管同时导通烧坏MOS管,延时时间可由CPLD进行设置,若同步脉冲标志为1,进入步骤六,否则进入步骤七;步骤六,打开上桥臂MOS管,使输出到气体中子探测器的工作电极的电压从低压切换到高压,确保其工作于坪区电压,提高其探测效率,进入步骤一;步骤七,打开下桥臂MOS管,使输出到气体中子探测器的工作电极的电压从低压切换到高压,确保其工作于坪区电压以下,降低其探测效率,防止探测器饱和,进入步骤一。A control method for high and low voltage pulsed power supplies for gas neutron detectors, as shown in Figure 2, includes the following steps: step 1, the CPLD chip monitors the neutron synchronous pulse signal in real time, when the source neutron arrives, the synchronous signal is low Level, when the source neutron ends, the synchronization signal is high level; when the rising edge of the synchronization signal is detected, enter step two, when the falling edge of the synchronization signal is detected, enter step three, otherwise enter step four; step 2. Set the sync pulse flag to 1, turn off the MOS tube of the lower bridge arm, prohibit the DC low-voltage power supply from pulling the working electrode of the gas neutron detector to a low voltage, and enter step 5; step 3, set the sync pulse flag to 0, and turn off the upper For the bridge arm MOS tube, it is forbidden to use the DC high-voltage power supply to pull the working electrode of the gas neutron detector to a high voltage, and then enter step five; step four, keep the upper and lower bridge arm MOS tubes in the original state, and enter step one; step five, perform dead Zone delay to prevent the MOS tube from being burned due to simultaneous conduction of the upper and lower bridge arm MOS tubes. The delay time can be set by the CPLD. If the sync pulse flag is 1, go to step 6, otherwise go to step 7; step 6, open the upper bridge arm MOS tube, switch the voltage output to the working electrode of the gas neutron detector from low voltage to high voltage, ensure that it works at the plateau voltage, improve its detection efficiency, enter step 1; step 7, open the lower bridge arm MOS tube, make Switch the voltage output to the working electrode of the gas neutron detector from low voltage to high voltage to ensure that it works below the plateau voltage, reduce its detection efficiency, and prevent the detector from being saturated, and enter step 1.
进一步,所述的同步脉冲信号14可由外部输入,也可以由CPU(如单片机、DSP、ARM、FPGA/CPLD)根据源中子同步脉冲信号产生,如图3所示,该同步脉冲信号可与源中子同步脉冲信号保持一致的时序,也可以有自己的特定时序,如上升沿与源中子触发脉冲同步,其高电平脉冲占空比根据实际需要由CPU进行设置。Further, described synchronous pulse signal 14 can be input by the outside, also can be produced by CPU (such as single-chip microcomputer, DSP, ARM, FPGA/CPLD) according to source neutron synchronous pulse signal, as shown in Figure 3, this synchronous pulse signal can be with The source neutron synchronization pulse signal maintains a consistent timing, and can also have its own specific timing, such as the rising edge is synchronized with the source neutron trigger pulse, and its high-level pulse duty cycle is set by the CPU according to actual needs.
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.
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