CN111579631B - A laser ablation system drives plasma mass spectrometer interface conversion circuit - Google Patents
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Abstract
本发明提供一种激光剥蚀系统驱动等离子体质谱仪接口转换电路，包括以下：信号输入单元、电源升压单元、光耦继电器单元和输出单元；当激光剥蚀系统的触发信号输入至所述信号输入单元，且所述光耦继电器单元接收到所述信号输入单元产生的24V直流阶跃激活信号时，所述输出接口产生触发接通信号，实现激光剥蚀系统与等离子体质谱仪的同步工作；本发明提供的有益效果是：采取光电耦合继电器将信号转换电路运作模式由“信号1‑转换‑信号2”转换成具有普适性的“信号‑判断‑自我激励”方式，当等离子体质谱仪触发电压发生改变时，可以被同类型的激光剥蚀系统激活，同时输入端与输出端形成隔离，提高了安全性。
The invention provides a laser ablation system driving plasma mass spectrometer interface conversion circuit, comprising the following: a signal input unit, a power boost unit, an optocoupler relay unit and an output unit; when the trigger signal of the laser ablation system is input to the signal input When the optocoupler relay unit receives the 24V DC step activation signal generated by the signal input unit, the output interface generates a triggering signal to realize the synchronous operation of the laser ablation system and the plasma mass spectrometer; The beneficial effects provided by the invention are: adopting photoelectric coupling relays to convert the operation mode of the signal conversion circuit from "signal 1-conversion-signal 2" to a universal "signal-judgment-self-excitation" mode, when the plasma mass spectrometer is triggered When the voltage changes, it can be activated by the same type of laser ablation system, and the input terminal and the output terminal are isolated at the same time, which improves the safety.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to a laser ablation system driving plasma mass spectrometer interface conversion circuit.
Background
The laser ablation system generates laser to bombard the measured substance for a short time and simultaneously generates aerosol particles necessary for the analysis of the plasma mass spectrometer. After the bombardment is finished, an activation trigger signal is generated, and the mass spectrometer can perform subsequent analysis after receiving the trigger signal.
At present, in the experimental process, a 24V direct-current step activation signal generated by a laser ablation system needs to be used for driving an inductively coupled plasma mass spectrometer, but the activation receiving upper limit of the mass spectrometer is 5V, for example, a 193nm laser ablation system and an agilent inductively coupled plasma mass spectrometer, so that a certain safe method is needed for triggering the plasma mass spectrometer by using the 24V direct-current step signal, and the synchronous work of the two is realized;
D. gray et al, 1985, first used laser ablation in combination with a plasma mass spectrometer for multi-element analysis of solid samples; according to the description of an article LA-ICP-MS of Niu Jia et al and the application thereof in the analysis of the pyrite in-situ micro-area, the working state of a mass spectrometer needs to be manually set, so that a conversion interface circuit of an activation signal can greatly liberate the setting of personnel; according to the description of the '193 nm laser and inductively coupled plasma mass spectrometer combined condition optimization research' of the Zhen Yue et al article, the sample denudation sampling process belongs to an intermittent mode and has large relative deviation due to the limitation of a laser generation principle- 'pulse excitation', the requirement of combining the two devices in an actual experiment exists, and the equivalent effect is reasonably realized by using a conversion interface circuit under the condition of not replacing the devices;
the device similar to the device on the market at present has a signal transmitter of a laser ablation triggering mass spectrometer, but the device has a plurality of problems in practical use: A. the device can not be used for the device, namely, the activation signal transmission of the laser ablation system is realized; B. in actual use, a large amount of heat is generated along with the device, and great potential safety hazards exist in a laboratory; C. the signal input part and the signal output part are not strictly isolated, and the output signal can also send out an error response signal once the input signal has a fault and is abnormal.
Disclosure of Invention
In view of the above, the present invention provides an interface conversion circuit for a laser ablation system driven plasma mass spectrometer, which aims at the problems in the prior art.
The invention provides a laser ablation system driving plasma mass spectrometer interface conversion circuit, which comprises the following components:
the device comprises a signal input unit, a power supply boosting unit, an optical coupling relay unit and an output unit;
the signal input unit is connected with a trigger signal output interface of the laser ablation system and used for acquiring a trigger signal of the laser ablation system and generating a 24V direct current step activation signal generated by the laser ablation system;
the power supply boosting unit is electrically connected with the optocoupler relay unit; the power supply boosting unit is used for converting 3.3V voltage into 24V voltage, and the 24V voltage is used as the judgment reference voltage of the optocoupler relay unit;
the signal input unit is also electrically connected with the optical coupling relay unit and is used for providing required working voltage for the optical coupling relay unit;
the optical coupling relay unit is electrically connected with the output unit; the output unit is electrically connected with the plasma mass spectrometer;
the power supply boosting unit and the optocoupler relay unit jointly form a voltage judgment module to realize a 'signal-judgment-self-excitation' working mode;
when a trigger signal of the laser ablation system is input to the signal input unit and the optocoupler relay unit receives a 24V direct current step activation signal generated by the signal input unit, the output interface generates a trigger connection signal to realize synchronous work of the laser ablation system and the plasma mass spectrometer.
Further, the power supply boosting unit includes: micro-usb female port X0, capacitor C1, capacitor C2, inductor L, resistor R1, MT3608 chip U1, trimming resistor U2 and diode D1;
the 1 st pin of the micro-usb female port X0 is respectively connected to one end of an inductor L, one end of a capacitor C1 and the 4 th and 5 th pins of a U1 of an MT3608 chip; the other end of the inductor L is connected with the 1 st pin of the MT3608 chip U1 and the anode of the diode D1;
the 3 rd pin of the MT3608 chip U1 is connected with the 3 rd pin of the trimming resistor U2; the 2 nd pin of the trimming resistor U2 is connected with one end of a resistor R1 and the 3 rd pin of the trimming resistor U2; the 2 nd pin of the trimming resistor U2 is connected with one end of a resistor R1 and the 3 rd pin of the trimming resistor U2;
the 5 th pin of the micro-usb female port X0 is respectively connected with the other end of a capacitor C1, the 2 nd pin of an MT3608 chip U1, the other end of a capacitor C2 and the other end of a resistor R1;
the 5 th pin of the micro-usb female port X0 is also electrically connected with the optical coupling relay unit and the signal input unit respectively;
the negative electrode of the diode D1 is electrically connected with the 1 st pin of the trimming resistor U2, one end of the capacitor C2 and the optocoupler relay unit;
the working principle of the power supply boosting unit is as follows: the 3.3V voltage is transmitted into a circuit through micro-usb, and is transmitted to a synchronous boosting chip U1 to realize a boosting function after the filtering action of a capacitor C1 and an inductor L, and then an adjustable voltage division circuit is formed by a slide rheostat U2 and a resistor R1 to realize the output of the specified 24V voltage.
Further, the photocoupler relay unit includes: the device comprises an input interface J-in, a level selection column LH, a diode D2, a light emitting diode D3, a light emitting diode D4, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a triode U3, an optical coupler U4, a relay U5 and an output interface J-out;
the 1 st pin of the input interface J-in is respectively connected with the 3 rd pin of the level selection column LH, the collector of the triode U3, one end of the resistor R3 and one end of the resistor R4; the anode of the light-emitting diode D3 is connected with the other end of the resistor R3;
the 2 nd pin of the input interface J-in is respectively connected with the 1 st pin of the level selection column LH, the cathode of the light-emitting diode D4 and the anode of the diode D2; one end of a cathode resistor R2 of the diode D2 is connected; the other end of the resistor R2 is connected with the anode of the light-emitting diode D4; the 1 st pin of the level selection column LH is connected with one end of a resistor R6; the other end of the resistor R6 is connected with the 1 st pin of the optocoupler U4;
the 5 th pin of the micro-usb female port X0 is respectively connected with the 2 nd pin of the input interface J-in, the cathode of the light-emitting diode D3 and the 3 rd pin of the relay U5;
the cathode of the diode D1 is connected with the 1 st pin of the trimming resistor U2, one end of the capacitor C2 and the 1 st pin of the input interface J-in; the 2 nd pin of the optocoupler U4 is electrically connected with the signal input unit;
the 3 rd pin of the optocoupler U4 is connected with the 3 rd pin of the relay U5; the 4 th pin of the optical coupler U4 is connected with the other end of the resistor R4 and one end of the resistor R5 respectively; the other end of the resistor R5 is connected with an emitting electrode of a triode U3; the collector of the triode U3 is respectively connected with the cathode of the diode D2 and the 1 st pin of the relay U5; the 2 nd pin of the relay U5 is connected with the 2 nd pin of an output interface J-out; the 4 th pin of the relay U5 is connected with the 1 st pin of an output interface J-out; the 5 th pin of the relay U5 is connected with the 3 rd pin of an output interface J-out;
the 1 st pin and the 2 nd pin of the output interface J-out are electrically connected with the output unit.
The specific working principle of the optical coupling relay unit is as follows: the DC + and the DC-of the input port J-IN provide power for the relay unit, and the port IN is connected with a signal output port of the laser ablation device; the voltage is adjusted to be high level effective through a binding post LH, when the optocoupler U4 receives voltage equivalent to a J-in port DC-, the relay U5 is triggered to conduct a circuit, and the function of conducting working signals of the plasma mass spectrometer is realized.
Further, said signal input unit sets a BNC type interface P1; the output unit is provided with an interface J1 of the DB9 type;
the 5 th pin of the micro-usb female port X0 is connected with a BNC type interface P1 ground electrode;
the No. 2 pin of the optical coupler U4 is connected with the positive electrode of the BNC type interface P1;
the 1 st pin of the output interface J-out is connected with the 5 th pin of an interface J1 of a DB9 type; the No. 2 pin of the output interface J-out is connected with the No. 3 pin of an interface J1 of a DB9 type;
when the optical coupling relay unit receives a 24V direct current step activation signal generated by the signal input unit, the 1 st pin and the 2 nd pin of the output interface J-out are closed, the 3 rd pin and the 5 th pin of the interface J1 of the signal output unit DB9 are short-circuited, and finally the output interface generates a trigger connection signal, so that the synchronous work of the laser ablation system and the plasma mass spectrometer is realized.
The working mode of 'signal-judgment-self-excitation' is specifically as follows: when the laser ablation system generates a trigger signal, the optical coupling relay unit compares the signal with the voltage generated by the power supply boosting unit, and the relay of the optical coupling relay unit is switched on when the voltage difference between the signal and the voltage is within a preset range, so that an internal work activation signal of the plasma mass spectrometer is switched on, and self-activation of the plasma mass spectrometer is realized.
The beneficial effects provided by the invention are as follows: a photoelectric coupling relay is adopted to convert the operation mode of a signal conversion circuit from 'signal 1-conversion-signal 2' into a universal 'signal-judgment-self-excitation' mode, when the trigger voltage of the plasma mass spectrometer is changed, the plasma mass spectrometer can be activated by the same type of laser ablation system, and meanwhile, the input end and the output end are isolated, so that the safety is improved.
Drawings
FIG. 1 is a schematic structural diagram of a laser ablation system-driven plasma mass spectrometer interface conversion circuit according to the present invention;
FIG. 2 is a schematic circuit diagram of a laser ablation system driven plasma mass spectrometer interface switching circuit of the present invention;
FIG. 3 is an enlarged circuit diagram of a portion of the power boost unit of the present invention;
fig. 4 is an enlarged circuit diagram of a portion of the photocoupler relay unit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the invention provides a laser ablation system-driven plasma mass spectrometer interface conversion circuit, which includes the following:
the device comprises a signal input unit, a power supply boosting unit, an optical coupling relay unit and an output unit;
the signal input unit is connected with a trigger signal output interface of the laser ablation system and used for acquiring a trigger signal of the laser ablation system and generating a 24V direct current step activation signal generated by the laser ablation system;
the power supply boosting unit is electrically connected with the optocoupler relay unit; the power supply boosting unit is used for converting 3.3V voltage into 24V voltage, and the 24V voltage is used as the judgment reference voltage of the optocoupler relay unit;
the signal input unit is also electrically connected with the optical coupling relay unit and is used for providing required working voltage for the optical coupling relay unit;
the optical coupling relay unit is electrically connected with the output unit; the output unit is electrically connected with the plasma mass spectrometer;
the power supply boosting unit and the optocoupler relay unit jointly form a voltage judgment module to realize a 'signal-judgment-self-excitation' working mode;
when a trigger signal of the laser ablation system is input to the signal input unit and the optocoupler relay unit receives a 24V direct current step activation signal generated by the signal input unit, the output interface generates a trigger connection signal to realize synchronous work of the laser ablation system and the plasma mass spectrometer.
Referring to fig. 2 and 3, the power boost unit includes: micro-usb female port X0, capacitor C1, capacitor C2, inductor L, resistor R1, MT3608 chip U1, trimming resistor U2 and diode D1;
the 1 st pin of the micro-usb female port X0 is respectively connected to one end of an inductor L, one end of a capacitor C1 and the 4 th and 5 th pins of a U1 of an MT3608 chip; the other end of the inductor L is connected with the 1 st pin of the MT3608 chip U1 and the anode of the diode D1;
the 3 rd pin of the MT3608 chip U1 is connected with the 3 rd pin of the trimming resistor U2; the 2 nd pin of the trimming resistor U2 is connected with one end of a resistor R1 and the 3 rd pin of the trimming resistor U2; the 2 nd pin of the trimming resistor U2 is connected with one end of a resistor R1 and the 3 rd pin of the trimming resistor U2;
the 5 th pin of the micro-usb female port X0 is respectively connected with the other end of a capacitor C1, the 2 nd pin of an MT3608 chip U1, the other end of a capacitor C2 and the other end of a resistor R1;
the 5 th pin of the micro-usb female port X0 is also electrically connected with the optical coupling relay unit and the signal input unit respectively;
the negative electrode of the diode D1 is electrically connected with the 1 st pin of the trimming resistor U2, one end of the capacitor C2 and the optocoupler relay unit;
the working principle of the power supply boosting unit is as follows: the 3.3V voltage is transmitted into a circuit through micro-usb, and is transmitted to a synchronous boosting chip U1 to realize a boosting function after the filtering action of a capacitor C1 and an inductor L, and then an adjustable voltage division circuit is formed by a slide rheostat U2 and a resistor R1 to realize the output of the specified 24V voltage.
Referring to fig. 2 and 4, the optocoupler relay unit includes: the device comprises an input interface J-in, a level selection column LH, a diode D2, a light emitting diode D3, a light emitting diode D4, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a triode U3, an optical coupler U4, a relay U5 and an output interface J-out;
the 1 st pin of the input interface J-in is respectively connected with the 3 rd pin of the level selection column LH, the collector of the triode U3, one end of the resistor R3 and one end of the resistor R4; the anode of the light-emitting diode D3 is connected with the other end of the resistor R3;
the 2 nd pin of the input interface J-in is respectively connected with the 1 st pin of the level selection column LH, the cathode of the light-emitting diode D4 and the anode of the diode D2; one end of a cathode resistor R2 of the diode D2 is connected; the other end of the resistor R2 is connected with the anode of the light-emitting diode D4; the 1 st pin of the level selection column LH is connected with one end of a resistor R6; the other end of the resistor R6 is connected with the 1 st pin of the optocoupler U4;
the 5 th pin of the micro-usb female port X0 is respectively connected with the 2 nd pin of the input interface J-in, the cathode of the light-emitting diode D3 and the 3 rd pin of the relay U5;
the cathode of the diode D1 is connected with the 1 st pin of the trimming resistor U2, one end of the capacitor C2 and the 1 st pin of the input interface J-in; the 2 nd pin of the optocoupler U4 is electrically connected with the signal input unit;
the 3 rd pin of the optocoupler U4 is connected with the 3 rd pin of the relay U5; the 4 th pin of the optical coupler U4 is connected with the other end of the resistor R4 and one end of the resistor R5 respectively; the other end of the resistor R5 is connected with an emitting electrode of a triode U3; the collector of the triode U3 is respectively connected with the cathode of the diode D2 and the 1 st pin of the relay U5; the 2 nd pin of the relay U5 is connected with the 2 nd pin of an output interface J-out; the 4 th pin of the relay U5 is connected with the 1 st pin of an output interface J-out; the 5 th pin of the relay U5 is connected with the 3 rd pin of an output interface J-out;
the 1 st pin and the 2 nd pin of the output interface J-out are electrically connected with the output unit.
The specific working principle of the optical coupling relay unit is as follows: the DC + and the DC-of the input port J-IN provide power for the relay unit, and the port IN is connected with a signal output port of the laser ablation device; the voltage is adjusted to be high level effective through a binding post LH, when the optocoupler U4 receives voltage equivalent to a J-in port DC-, the relay U5 is triggered to conduct a circuit, and the function of conducting working signals of the plasma mass spectrometer is realized.
The signal input unit is provided with a BNC type interface P1; the output unit is provided with an interface J1 of the DB9 type;
the 5 th pin of the micro-usb female port X0 is connected with a BNC type interface P1 ground electrode;
the No. 2 pin of the optical coupler U4 is connected with the positive electrode of the BNC type interface P1;
the 1 st pin of the output interface J-out is connected with the 5 th pin of an interface J1 of a DB9 type; the No. 2 pin of the output interface J-out is connected with the No. 3 pin of an interface J1 of a DB9 type;
when the optical coupling relay unit receives a 24V direct current step activation signal generated by the signal input unit, the 1 st pin and the 2 nd pin of the output interface J-out are closed, the 3 rd pin and the 5 th pin of the interface J1 of the signal output unit DB9 are short-circuited, and finally the output interface generates a trigger connection signal, so that the synchronous work of the laser ablation system and the plasma mass spectrometer is realized.
The working mode of 'signal-judgment-self-excitation' is specifically as follows: when the laser ablation system generates a trigger signal, the optical coupling relay unit compares the signal with the voltage generated by the power supply boosting unit, and the relay of the optical coupling relay unit is switched on when the voltage difference between the signal and the voltage is within a preset range, so that an internal work activation signal of the plasma mass spectrometer is switched on, and self-activation of the plasma mass spectrometer is realized.
In the embodiment of the invention, the specification parameters of each component are uniformly explained as follows:
inductor L (22UH), chip U1(MT3608), diode D1(SS34), capacitor C1(15uF), capacitor C2(15uF), resistor R1(2.2k), chip U2(SOP-R), resistor R3(2.2k), diode D2(LL4148), triode U3(S8550), resistor R4(10k), resistor R5(2.2k), resistor R6(10k), chip U4(NEC2705) and chip U5(srd-24 vdc-sl-C); the above-mentioned alternatives are only for reference and are not intended to limit the present invention; the skilled person can also select different specifications according to the actual situation.
Compared with the prior art, the application has the advantages that:
1. the invention is formed by connecting a boosting unit and a photoelectric coupling relay unit to form a voltage judgment module, and converts the operation mode of a signal conversion circuit from 'signal 1-conversion-signal 2' into a universal 'signal-judgment-self-excitation' mode. The time when the laser ablation system generates the activation signal is judged by comparing the reference voltage with the reference voltage generated by the boosting module, and the plasma mass spectrometer completes self-excitation at the same time to realize synchronous work;
2. the invention adopts a photoelectric coupling relay judgment form, when the voltage changes due to the transformation of the equipment type, the activation signal output by the laser ablation system can activate the plasma mass spectrometer of the same type, and the device has universality in the aspect of sending the activation signal; due to the adoption of a self-excitation form, when the trigger voltage of the plasma mass spectrometer is changed, the plasma mass spectrometer can be activated by the same type of laser ablation systems, and the device has universality in the aspect of receiving an activation signal;
3. the invention adopts a 'signal-judgment-self-excitation' mode, so that the input end and the output end are isolated, and the safety aspect is also improved.
The beneficial effects of the implementation of the invention are as follows: a photoelectric coupling relay is adopted to convert the operation mode of a signal conversion circuit from 'signal 1-conversion-signal 2' into a universal 'signal-judgment-self-excitation' mode, when the trigger voltage of the plasma mass spectrometer is changed, the plasma mass spectrometer can be activated by the same type of laser ablation system, and meanwhile, the input end and the output end are isolated, so that the safety is improved.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
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