CN111579631A - Interface conversion circuit of plasma mass spectrometer driven by laser ablation system - Google Patents

Abstract

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; 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; 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.

Description

A laser ablation system drives plasma mass spectrometer interface conversion circuit

technical field

The invention relates to the field of electronic circuits, in particular to an interface conversion circuit of a plasma mass spectrometer driven by a laser ablation system.

Background technique

The laser ablation system generates laser light to bombard the measured substance for a short time, and at the same time generates the aerosol particles necessary for the analysis of the plasma mass spectrometer. After the bombardment is completed, an activation trigger signal is generated, and the mass spectrometer can only perform subsequent analysis after receiving the trigger signal.

At present, the ICP-MS is driven by the 24V DC step activation signal generated by the laser ablation system during the experiment, but the upper limit of activation and reception of the mass spectrometer is 5V, such as the equipment 193nm laser ablation system and Agilent ICP-MS Therefore, a safe method is needed to trigger the plasma mass spectrometer with a 24V DC step signal, so as to realize the synchronous work of the two;

D. Gray et al. first combined laser ablation with plasma mass spectrometer in 1985 for multi-element analysis of solid samples; According to the description of "Application in Area Analysis", it is necessary to manually set the working state of the mass spectrometer, so the conversion interface circuit of the activation signal can greatly liberate the personnel to set up; "Condition Optimization Research" describes that due to the limitation of the laser generation principle - "pulse excitation", the ablation and sampling process of the sample belongs to the intermittent mode, and the relative deviation is large. In the case of replacing the equipment, it is more reasonable to use the conversion interface circuit to achieve the same effect;

At present, a similar device on the market has "a signal transmission device for laser ablation triggering a mass spectrometer", but this device has many problems in actual use: A. It cannot be used for the equipment mentioned above, that is, the realization of laser The activation signal transmission of the ablation system; B. In actual use, there will be a lot of heat of the device, and there is a large safety hazard in the laboratory; C. The signal input part and the signal output part are not strictly isolated. Once the input signal exists The fault exception output signal also signals an error response.

SUMMARY OF THE INVENTION

In view of this, the present invention proposes a laser ablation system-driven plasma mass spectrometer interface conversion circuit aiming at the problems existing in the prior art.

The invention provides a laser ablation system driving plasma mass spectrometer interface conversion circuit, including the following:

Signal input unit, power boost unit, optocoupler relay unit and output unit;

The signal input unit is connected with the trigger signal output interface of the laser ablation system, and is used to obtain the trigger signal of the laser ablation system and generate a 24V DC step activation signal generated by the laser ablation system;

The power boosting unit is electrically connected to the optocoupler relay unit; the power boosting unit is used to convert the 3.3V voltage into a 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 to the optocoupler relay unit, for providing the required working voltage for the optocoupler relay unit;

the optocoupler relay unit is electrically connected to the output unit; the output unit is electrically connected to the plasma mass spectrometer;

The power boost unit and the optocoupler relay unit together form a voltage judgment module to realize the "signal-judgment-self-excitation" working mode;

When the trigger signal of the laser ablation system is input to the signal input unit, and the optocoupler relay unit receives the 24V DC step activation signal generated by the signal input unit, the output interface generates a trigger-on signal , to realize the synchronous operation of the laser ablation system and the plasma mass spectrometer.

Further, the power boosting unit includes: micro-usb female port X0, capacitor C1, capacitor C2, inductor L, resistor R1, MT3608 chip U1, trimming resistor U2, diode D1;

The first pin of the micro-usb female port X0 is respectively connected to one end of the inductor L, one end of the capacitor C1 and the fourth and fifth pins of the MT3608 chip U1; the other end of the inductor L is connected to the first end of the MT3608 chip U1. The pin is connected to the anode of diode D1;

The third pin of the MT3608 chip U1 is connected to the third pin of the trimming resistor U2; the second pin of the trimming resistor U2 is connected to one end of the resistor R1 and the third pin of the trimming resistor U2; Pin 2 is connected to one end of the resistor R1 and the third pin of the trimmer resistor U2;

The fifth pin of the micro-usb female port X0 is respectively connected with the other end of the capacitor C1, the second pin of the MT3608 chip U1, the other end of the capacitor C2, and the other end of the resistor R1;

The fifth pin of the micro-usb female port X0 is also electrically connected to the optocoupler relay unit and the signal input unit respectively;

The cathode of the diode D1 is electrically connected to the first pin of the trimming resistor U2, one end of the capacitor C2 and the optocoupler relay unit;

The working principle of the power boosting unit is: 3.3V voltage is introduced into the circuit by the micro-usb, after the filtering effect of the capacitor C1 and the inductor L, it is transmitted to the synchronous boosting chip U1 to realize the boosting function, and then the sliding rheostat U2 and the Resistor R1 constitutes an adjustable voltage divider circuit to achieve a specified 24V voltage output.

Further, the optocoupler relay unit includes: 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, optocoupler U4, relay U5, output interface J-out;

The first pin of the input interface J-in is respectively connected with the third pin of the level selection column LH, the collector of the triode U3, and one end of the resistor R3 is connected with one end of the resistor R4; the anode of the light-emitting diode D3 is connected with the other end of the resistor R3 connected;

The second pin of the input interface J-in is respectively connected with the first pin of the level selection column LH, the negative electrode of the light emitting diode D4 is connected with the positive electrode of the diode D2; one end of the negative electrode resistance R2 of the diode D2 is connected; The other end of the resistor R2 is connected to the positive pole of the light-emitting diode D4; the first pin of the level selection column LH is connected to one end of the resistor R6; the other end of the resistor R6 is connected to the first pin of the optocoupler U4;

The 5th pin of the micro-usb female port X0 is respectively connected with the 2nd pin of the input interface J-in, the negative electrode of the light-emitting diode D3 and the 3rd pin of the relay U5;

The cathode of the diode D1 is connected with the first pin of the trimming resistor U2, one end of the capacitor C2 and the first pin of the input interface J-in; the second pin of the optocoupler U4 is electrically connected to the signal input unit. connect;

The third pin of the optocoupler U4 is connected with the third pin of the relay U5; the fourth pin of the optocoupler U4 is respectively connected with the other end of the resistor R4 and one end of the resistor R5; the other end of the resistor R5 is connected with the transistor U3 The emitter is connected to each other; the collector of the transistor U3 is connected to the negative electrode of the diode D2 and the 1st pin of the relay U5 respectively; the 2nd pin of the relay U5 is connected to the 2nd pin of the output interface J-out; the relay The 4th pin of U5 is connected with the 1st pin of output interface J-out; The 5th pin of described relay U5 is connected with the 3rd pin of output interface J-out;

The first pin and the second pin of the output interface J-out are electrically connected to the output unit.

The specific working principle of the optical coupling relay unit is as follows: the power supply of the relay unit is provided by the DC+ and DC- of the input port J-in, and the port IN is connected to the signal output port of the laser ablation device; the terminal LH is adjusted to be effective at a high level, When the optocoupler U4 receives a voltage equivalent to the DC- of the J-in port, the relay U5 is triggered to conduct the circuit to realize the function of conducting the working signal of the plasma mass spectrometer.

Further, the signal input unit is provided with a BNC type interface P1; the output unit is provided with a DB9 type interface J1;

The fifth pin of the micro-usb female port X0 is connected to the ground electrode of the BNC type interface P1;

The second pin of the optocoupler U4 is connected to the positive pole of the interface P1 of the BNC type;

The 1st pin of described output interface J-out is connected with the 5th pin of the interface J1 of DB9 type; The 2nd pin of described output interface J-out is connected with the 3rd pin of the interface J1 of DB9 type;

When the optocoupler relay unit receives the 24V DC step activation signal generated by the signal input unit, the first and second pins of the output interface J-out are closed to realize the third pin of the DB9 interface J1 of the signal output unit. Short-circuit with the 5th pin, the final output interface generates a trigger-on signal to realize the synchronous operation of the laser ablation system and the plasma mass spectrometer.

The "signal-judgment-self-excitation" working mode is specifically: when the laser ablation system generates a trigger signal input, the optocoupler relay unit will compare the signal with the voltage generated by the power boost unit, and when two When the voltage difference between the two is within a preset range, the relay of the optocoupler relay unit will be turned on, and then the internal working activation signal of the plasma mass spectrometer will be turned on to realize the self-activation of the plasma mass spectrometer.

The beneficial effects provided by the invention are: adopting the photoelectric coupling relay to convert the operation mode of the signal conversion circuit from "signal 1-conversion-signal 2" to the universal "signal-judgment-self-excitation" mode, when the plasma mass spectrometer When the trigger voltage changes, it can be activated by the same type of laser ablation system, and at the same time, the input end and the output end are isolated, which improves the safety.

Description of drawings

1 is a schematic structural diagram of a laser ablation system driving plasma mass spectrometer interface conversion circuit of the present invention;

2 is a circuit schematic diagram of a laser ablation system driving plasma mass spectrometer interface conversion circuit of the present invention;

Fig. 3 is the amplification circuit diagram of the power boosting unit part of the present invention;

FIG. 4 is an amplifying circuit diagram of an optocoupler relay unit part of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

Please refer to FIG. 1, an embodiment of the present invention provides a laser ablation system driving plasma mass spectrometer interface conversion circuit, the system includes the following:

Signal input unit, power boost unit, optocoupler relay unit and output unit;

The signal input unit is connected with the trigger signal output interface of the laser ablation system, and is used to obtain the trigger signal of the laser ablation system and generate a 24V DC step activation signal generated by the laser ablation system;

The power boosting unit is electrically connected to the optocoupler relay unit; the power boosting unit is used to convert the 3.3V voltage into a 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 to the optocoupler relay unit, for providing the required working voltage for the optocoupler relay unit;

the optocoupler relay unit is electrically connected to the output unit; the output unit is electrically connected to the plasma mass spectrometer;

The power boost unit and the optocoupler relay unit together form a voltage judgment module to realize the "signal-judgment-self-excitation" working mode;

When the trigger signal of the laser ablation system is input to the signal input unit, and the optocoupler relay unit receives the 24V DC step activation signal generated by the signal input unit, the output interface generates a trigger-on signal , to realize the synchronous operation of the laser ablation system and the plasma mass spectrometer.

Please refer to Figure 2 and Figure 3, the power boost unit includes: micro-usb female port X0, capacitor C1, capacitor C2, inductor L, resistor R1, MT3608 chip U1, trimmer resistor U2, diode D1;

The first pin of the micro-usb female port X0 is respectively connected to one end of the inductor L, one end of the capacitor C1 and the fourth and fifth pins of the MT3608 chip U1; the other end of the inductor L is connected to the first end of the MT3608 chip U1. The pin is connected to the anode of diode D1;

The third pin of the MT3608 chip U1 is connected to the third pin of the trimming resistor U2; the second pin of the trimming resistor U2 is connected to one end of the resistor R1 and the third pin of the trimming resistor U2; Pin 2 is connected to one end of the resistor R1 and the third pin of the trimmer resistor U2;

The fifth pin of the micro-usb female port X0 is respectively connected with the other end of the capacitor C1, the second pin of the MT3608 chip U1, the other end of the capacitor C2, and the other end of the resistor R1;

The fifth pin of the micro-usb female port X0 is also electrically connected to the optocoupler relay unit and the signal input unit respectively;

The cathode of the diode D1 is electrically connected to the first pin of the trimming resistor U2, one end of the capacitor C2 and the optocoupler relay unit;

The working principle of the power boosting unit is: 3.3V voltage is introduced into the circuit by the micro-usb, after the filtering effect of the capacitor C1 and the inductor L, it is transmitted to the synchronous boosting chip U1 to realize the boosting function, and then the sliding rheostat U2 and the Resistor R1 constitutes an adjustable voltage divider circuit to achieve a specified 24V voltage output.

Please refer to FIG. 2 and FIG. 4 , the optocoupler relay unit includes: 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, and a resistor R5 , resistor R6, transistor U3, optocoupler U4, relay U5, output interface J-out;

The first pin of the input interface J-in is respectively connected with the third pin of the level selection column LH, the collector of the triode U3, and one end of the resistor R3 is connected with one end of the resistor R4; the anode of the light-emitting diode D3 is connected with the other end of the resistor R3 connected;

The second pin of the input interface J-in is respectively connected with the first pin of the level selection column LH, the negative electrode of the light emitting diode D4 is connected with the positive electrode of the diode D2; one end of the negative electrode resistance R2 of the diode D2 is connected; The other end of the resistor R2 is connected to the positive pole of the light-emitting diode D4; the first pin of the level selection column LH is connected to one end of the resistor R6; the other end of the resistor R6 is connected to the first pin of the optocoupler U4;

The 5th pin of the micro-usb female port X0 is respectively connected with the 2nd pin of the input interface J-in, the negative electrode of the light-emitting diode D3 and the 3rd pin of the relay U5;

The cathode of the diode D1 is connected with the first pin of the trimming resistor U2, one end of the capacitor C2 and the first pin of the input interface J-in; the second pin of the optocoupler U4 is electrically connected to the signal input unit. connect;

The third pin of the optocoupler U4 is connected with the third pin of the relay U5; the fourth pin of the optocoupler U4 is respectively connected with the other end of the resistor R4 and one end of the resistor R5; the other end of the resistor R5 is connected with the transistor U3 The emitter is connected to each other; the collector of the transistor U3 is connected to the negative electrode of the diode D2 and the 1st pin of the relay U5 respectively; the 2nd pin of the relay U5 is connected to the 2nd pin of the output interface J-out; the relay The 4th pin of U5 is connected with the 1st pin of output interface J-out; The 5th pin of described relay U5 is connected with the 3rd pin of output interface J-out;

The first pin and the second pin of the output interface J-out are electrically connected to the output unit.

The specific working principle of the optical coupling relay unit is as follows: the power supply of the relay unit is provided by the DC+ and DC- of the input port J-in, and the port IN is connected to the signal output port of the laser ablation device; the terminal LH is adjusted to be effective at a high level, When the optocoupler U4 receives a voltage equivalent to the DC- of the J-in port, the relay U5 is triggered to conduct the circuit to realize the function of conducting the working signal of the plasma mass spectrometer.

The signal input unit is provided with a BNC type interface P1; the output unit is provided with a DB9 type interface J1;

The fifth pin of the micro-usb female port X0 is connected to the ground electrode of the BNC type interface P1;

The second pin of the optocoupler U4 is connected to the positive pole of the interface P1 of the BNC type;

The 1st pin of described output interface J-out is connected with the 5th pin of the interface J1 of DB9 type; The 2nd pin of described output interface J-out is connected with the 3rd pin of the interface J1 of DB9 type;

When the optocoupler relay unit receives the 24V DC step activation signal generated by the signal input unit, the first and second pins of the output interface J-out are closed to realize the third pin of the DB9 interface J1 of the signal output unit. Short-circuit with the 5th pin, the final output interface generates a trigger-on signal to realize the synchronous operation of the laser ablation system and the plasma mass spectrometer.

The "signal-judgment-self-excitation" working mode is specifically: when the laser ablation system generates a trigger signal input, the optocoupler relay unit will compare the signal with the voltage generated by the power boost unit, and when two When the voltage difference between the two is within a preset range, the relay of the optocoupler relay unit will be turned on, and then the internal working activation signal of the plasma mass spectrometer will be turned on to realize the self-activation of the plasma mass spectrometer.

In the embodiment of the present invention, the specification parameters of each component are uniformly described 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), transistor U3 (S8550), resistor R4 (10k), resistor R5 (2.2k), resistor R6 (10k), chip U4 (NEC2705), chip U5 (srd-24vdc-sl-c) The above selection is for reference only and is not intended to limit the present invention; those skilled in the art can also select models of different specifications according to the actual situation.

Compared with the prior art, the advantages of the present application are:

1. In the present invention, a voltage judgment module is formed by connecting the boosting unit and the photoelectric coupling relay unit, and the operation mode of the signal conversion circuit is converted from "signal 1-conversion-signal 2" to a universal "signal-judgment-self-excitation" Way. By comparing with the reference voltage generated by the boosting module, the timing of the activation signal generated by the laser ablation system can be judged, and the plasma mass spectrometer can be self-excited at the same time to achieve synchronous operation;

2. The present invention adopts the form of photoelectric coupling relay judgment. When the device type changes and the voltage changes, the activation signal output by the laser ablation system can activate the plasma mass spectrometer of the same type, and has universality in sending activation signal equipment; In the form of self-excitation, when the trigger voltage of the plasma mass spectrometer changes, it can be activated by the same type of laser ablation system, and it is universal in receiving activation signal equipment;

3. The present invention adopts the method of "signal-judgment-self-excitation", so that the input end and the output end are isolated, and the safety aspect is also improved.

The beneficial effect of the implementation of the present invention is that the operation mode of the signal conversion circuit is converted from "signal 1-conversion-signal 2" to a universal "signal-judgment-self-excitation" mode by using photoelectric coupling relays. When the plasma mass spectrometer When the trigger voltage changes, it can be activated by the same type of laser ablation system, and at the same time, the input end and the output end are isolated, which improves the safety.

The above-described embodiments and features of the embodiments herein may be combined with each other without conflict.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (5)

1. a laser ablation system drives plasma mass spectrometer interface conversion circuit, it is characterized in that: specifically comprise: Signal input unit, power boost unit, optocoupler relay unit and output unit; The signal input unit is connected with the trigger signal output interface of the laser ablation system, and is used to obtain the trigger signal of the laser ablation system and generate a 24V DC step activation signal generated by the laser ablation system; The power boosting unit is electrically connected to the optocoupler relay unit; the power boosting unit is used to convert the 3.3V voltage into a 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 to the optocoupler relay unit, for providing the required working voltage for the optocoupler relay unit; the optocoupler relay unit is electrically connected to the output unit; the output unit is electrically connected to the plasma mass spectrometer; The power boost unit and the optocoupler relay unit together form a voltage judgment module to realize the "signal-judgment-self-excitation" working mode; When the trigger signal of the laser ablation system is input to the signal input unit, and the optocoupler relay unit receives the 24V DC step activation signal generated by the signal input unit, the output interface generates a trigger-on signal , to realize the synchronous operation of the laser ablation system and the plasma mass spectrometer. 2. A laser ablation system driving plasma mass spectrometer interface conversion circuit according to claim 1, wherein the power boosting unit comprises: micro-usb female port X0, capacitor C1, capacitor C2, inductance L, Resistor R1, MT3608 chip U1, trimmer resistor U2, diode D1; The first pin of the micro-usb female port X0 is respectively connected to one end of the inductor L, one end of the capacitor C1 and the fourth and fifth pins of the MT3608 chip U1; the other end of the inductor L is connected to the first end of the MT3608 chip U1. The pin is connected to the anode of diode D1; The third pin of the MT3608 chip U1 is connected to the third pin of the trimming resistor U2; the second pin of the trimming resistor U2 is connected to one end of the resistor R1 and the third pin of the trimming resistor U2; Pin 2 is connected to one end of the resistor R1 and the third pin of the trimmer resistor U2; The fifth pin of the micro-usb female port X0 is respectively connected with the other end of the capacitor C1, the second pin of the MT3608 chip U1, the other end of the capacitor C2, and the other end of the resistor R1; The fifth pin of the micro-usb female port X0 is also electrically connected to the optocoupler relay unit and the signal input unit respectively; The cathode of the diode D1 is electrically connected to the first pin of the trimming resistor U2, one end of the capacitor C2 and the optocoupler relay unit; The working principle of the power boosting unit is: 3.3V voltage is introduced into the circuit by the micro-usb, after the filtering effect of the capacitor C1 and the inductor L, it is transmitted to the synchronous boosting chip U1 to realize the boosting function, and then the sliding rheostat U2 and the Resistor R1 constitutes an adjustable voltage divider circuit to achieve a specified 24V voltage output. 3. A laser ablation system-driven plasma mass spectrometer interface conversion circuit according to claim 2, wherein the optocoupler relay unit comprises: an input interface J-in, a level selection column LH, a diode D2, a light-emitting Diode D3, Light Emitting Diode D4, Resistor R2, Resistor R3, Resistor R4, Resistor R5, Resistor R6, Triode U3, Optocoupler U4, Relay U5, Output Interface J-out; The first pin of the input interface J-in is respectively connected with the third pin of the level selection column LH, the collector of the triode U3, and one end of the resistor R3 is connected with one end of the resistor R4; the anode of the light-emitting diode D3 is connected with the other end of the resistor R3 connected; The second pin of the input interface J-in is respectively connected with the first pin of the level selection column LH, the negative electrode of the light emitting diode D4 is connected with the positive electrode of the diode D2; one end of the negative electrode resistance R2 of the diode D2 is connected; The other end of the resistor R2 is connected to the positive pole of the light-emitting diode D4; the first pin of the level selection column LH is connected to one end of the resistor R6; the other end of the resistor R6 is connected to the first pin of the optocoupler U4; The 5th pin of the micro-usb female port X0 is respectively connected with the 2nd pin of the input interface J-in, the negative electrode of the light-emitting diode D3 and the 3rd pin of the relay U5; The cathode of the diode D1 is connected with the first pin of the trimming resistor U2, one end of the capacitor C2 and the first pin of the input interface J-in; the second pin of the optocoupler U4 is electrically connected to the signal input unit. connect; The third pin of the optocoupler U4 is connected with the third pin of the relay U5; the fourth pin of the optocoupler U4 is respectively connected with the other end of the resistor R4 and one end of the resistor R5; the other end of the resistor R5 is connected with the transistor U3 The emitter is connected to each other; the collector of the transistor U3 is connected to the negative electrode of the diode D2 and the 1st pin of the relay U5 respectively; the 2nd pin of the relay U5 is connected to the 2nd pin of the output interface J-out; the relay The 4th pin of U5 is connected with the 1st pin of output interface J-out; The 5th pin of described relay U5 is connected with the 3rd pin of output interface J-out; The first pin and the second pin of the output interface J-out are electrically connected to the output unit. The specific working principle of the optical coupling relay unit is as follows: the power supply of the relay unit is provided by the DC+ and DC- of the input port J-in, and the port IN is connected to the signal output port of the laser ablation device; the terminal LH is adjusted to be effective at a high level, When the optocoupler U4 receives a voltage equivalent to the DC- of the J-in port, the relay U5 is triggered to conduct the circuit to realize the function of conducting the working signal of the plasma mass spectrometer. 4. A laser ablation system-driven plasma mass spectrometer interface conversion circuit as claimed in claim 3, wherein: the signal input unit is provided with a BNC type interface P1; the output unit is provided with a DB9 type interface J1; The fifth pin of the micro-usb female port X0 is connected to the ground electrode of the BNC type interface P1; The second pin of the optocoupler U4 is connected to the positive pole of the interface P1 of the BNC type; The 1st pin of described output interface J-out is connected with the 5th pin of the interface J1 of DB9 type; The 2nd pin of described output interface J-out is connected with the 3rd pin of the interface J1 of DB9 type; When the optocoupler relay unit receives the 24V DC step activation signal generated by the signal input unit, the first and second pins of the output interface J-out are closed to realize the third pin of the DB9 interface J1 of the signal output unit. Short-circuit with the 5th pin, the final output interface generates a trigger-on signal to realize the synchronous operation of the laser ablation system and the plasma mass spectrometer. 5. The laser ablation system-driven plasma mass spectrometer interface conversion circuit according to claim 1, wherein the "signal-judgment-self-excitation" working mode is specifically: when the laser ablation system generates a trigger signal input When the optocoupler relay unit compares the signal with the voltage generated by the power booster unit, when the difference between the two voltages is within a preset range, the relay of the optocoupler relay unit will be turned on, thereby leading to Through the internal working activation signal of the plasma mass spectrometer, the self-activation of the plasma mass spectrometer is realized.

Images