CN104165862B - The laser-driven signal generator of laser gas analyzer - Google Patents
The laser-driven signal generator of laser gas analyzer Download PDFInfo
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- CN104165862B CN104165862B CN201410402516.9A CN201410402516A CN104165862B CN 104165862 B CN104165862 B CN 104165862B CN 201410402516 A CN201410402516 A CN 201410402516A CN 104165862 B CN104165862 B CN 104165862B
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Abstract
The present invention relates to the laser-driven signal generator of laser gas analyzer；Solve the technical problem that for: the laser-driven signal generator of the laser gas analyzer that a kind of noise is low, output frequency flexible, reference frequency output are wide is provided；The technical scheme used is: two signal output parts of fpga chip are connected with digital regulation resistance and DA conversion chip respectively, digital regulation resistance and the first operational amplifier are connected, first operational amplifier is connected with the band filter of frequency-adjustable, band filter and the first voltage follower are connected, DA conversion chip and the second operational amplifier are connected, second operational amplifier and the first low pass filter are connected, first low pass filter and the second voltage follower are connected, second voltage follower and the first voltage follower are all connected with adder, adder is connected with the second low pass filter, second low pass filter is connected with tertiary voltage follower, the outfan of tertiary voltage follower is the outfan of described signal generator；It is applicable to Circuits System field.
Description
Technical field
The present invention relates to laser field, be specifically related to the laser-driven signal generator of laser gas analyzer.
Background technology
In laser on-line gas analysis system, laser instrument is very important device, in current laser on-line gas analysis system, the technology used has two kinds: directly absorption spectroscopy techniques and wavelength modulation spectrum technology (WMS), compared to direct absorption spectroscopy techniques, the measurement sensitivity of system can be improved 100 ~ 1000 times by wavelength modulation spectrum technology (WMS), and its key technology is: realize driving and the demodulation of the noiselike signal to laser instrument；External Distributed Feedback Laser is by force 10 at the Absorption Line of 2234nm wave band correspondence CO gas-21The order of magnitude, system wants to reach the detectivity of ppb level gas, the current noise of its front-end circuit drive part should be less than the amplitude noise of signal generator of artificial circuit part of 2 μ A, V-I part and the signal to noise ratio (snr) of phase noise should meet at more than 80dB；And laser-driven signal is directly connected to the spectral noise of laser instrument, the stability of laser instrument can be affected, or even affect the measurement performance of whole system, signal to noise ratio and measure sensitivity, so, the amplitude noise of laser-driven signal generator of laser gas analyzer, Jitter noise and temperature drift characteristic will directly affect the accuracy of measurement of whole system.
Laser-driven signal is substantially obtained after frequency synthesis by two unlike signals, conventional frequency synthesis technique has direct-type, Direct Digital and hybrid, and digital frequency synthesizer DDS chip general on market is the factors such as non-homogeneous driving owing to being limited to DA quantizing noise and system scanning signal, it is difficult to meet the demand of system；Therefore, low noise, output frequency can flexible, the laser-driven signal generator of reference frequency output is wider and output waveform signals is more stable laser gas analyzer be particularly important.
Summary of the invention
The present invention overcomes the deficiency that prior art exists, technical problem to be solved to be: provide that a kind of noise is relatively low, output frequency can the laser-driven signal generator of the wider laser gas analyzer of flexible, reference frequency output.
nullIn order to solve above-mentioned technical problem，The technical solution used in the present invention is: the laser-driven signal generator of laser gas analyzer，Including: fpga chip，Two signal output parts of described fpga chip are connected with digital regulation resistance and DA conversion chip respectively，Described digital regulation resistance and the first operational amplifier are connected，Described first operational amplifier is connected with the band filter of frequency-adjustable，Described band filter and the first voltage follower are connected，Described DA conversion chip and the second operational amplifier are connected，Described second operational amplifier and the first low pass filter are connected，Described first low pass filter and the second voltage follower are connected，Described second voltage follower and the first voltage follower are all connected with adder，Described adder is connected with the second low pass filter，Described second low pass filter is connected with tertiary voltage follower，Described tertiary voltage follower is connected with V/I transducer，The outfan that outfan is described signal generator of described V/I transducer.
Described first operational amplifier includes: amplifier chip U1, it is connected with the output terminals A 1 of described digital regulation resistance after the in-phase input end series resistor R1 of described amplifier chip U1, it is connected with one end of resistance R3 after the described inverting input of amplifier chip U1 one end of connecting resistance R2, the other end ground connection of described resistance R2, the other end of described resistance R3 is connected with the outfan of described amplifier chip U1, it is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C1 of described amplifier chip U1, it is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C2 of described amplifier chip U1, the other end of described electric capacity C1 and the equal ground connection of the other end of electric capacity C2；nullDescribed band filter includes: amplifier chip U2、Amplifier chip U3 and amplifier chip U4，The inverting input of described amplifier chip U2 one end of connecting resistance R4、One end of resistance R5、It is connected with one end of electric capacity C4 after the end fixing with of adjustable resistance RP1 of one end of electric capacity C3，The other end of described resistance R4 is connected with the outfan of described amplifier chip U1，The other end of the other end shunt-wound capacitance C3 of described resistance R5 is connected with one end with resistance R6 after the outfan of amplifier chip U2，The other end of described resistance R6 is also connected with one end of resistance R7 after connecing the inverting input of described amplifier chip U3，The other end of another fixing end shunt-wound capacitance C4 of described adjustable resistance RP1 is connected with outfan with described amplifier chip U4 behind one end of electric capacity C5，The other end of described electric capacity C5 and after connecing the inverting input of described amplifier chip U4 end fixing with of variable resistance RP2 be connected，Another fixing end of described variable resistance RP2 also connects the other end of described resistance R7 and is connected with one end of electric capacity C6 after the outfan of described amplifier chip U3，The in-phase input end of described amplifier chip U2、The in-phase input end of described amplifier chip U3 and the equal ground connection of in-phase input end of described amplifier chip U4；Described first voltage follower includes: amplifier chip U5, it is connected with one end of resistance R9 after the described in-phase input end of amplifier chip U5 one end of connecting resistance R8, the other end of described resistance R8 is connected with the other end of described electric capacity C6, the other end ground connection of described resistance R9, the inverting input of described amplifier chip U5 is also connected with one end of resistance R10 after connecing the outfan of described amplifier chip U5；nullDescribed first low pass filter includes: amplifier chip U6，It is connected with one end of resistance R11 behind one end of the inverting input shunt-wound capacitance C7 of described amplifier chip U6，Ground connection after the in-phase input end series resistor R12 of described amplifier chip U6，The other end of described resistance R11 one end of connecting resistance R13 are connected with one end with resistance R14 behind one end of electric capacity C8，The other end of described resistance R14 is connected with the output terminals A 2 of described second operational amplifier，The other end ground connection of described electric capacity C8，The other end of described resistance R13 is also connected with the outfan of described amplifier chip U6 after connecing the other end of described electric capacity C7，It is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C9 of described amplifier chip U6，It is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C10 of described amplifier chip U6，The other end of described electric capacity C9 and the equal ground connection of the other end of electric capacity C10；Described second voltage follower includes: amplifier chip U7, after the in-phase input end series resistor R15 of described amplifier chip U7, the outfan with described amplifier chip U6 is connected, and the inverting input of described amplifier chip U7 is also connected with one end of resistance R16 after connecing the outfan of described amplifier chip U7；Described adder includes: amplifier chip U8, the in-phase input end of described amplifier chip U8 is also connected with the other end of described resistance R16 after connecing the other end of described resistance R10, it is connected with one end of resistance R18 after the described inverting input of amplifier chip U8 one end of connecting resistance R17, the other end ground connection of described resistance R17, the other end of described resistance R18 is connected with the outfan of described amplifier chip U8, it is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C11 of described amplifier chip U8, it is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C12 of described amplifier chip U8, the other end of described electric capacity C11 and the equal ground connection of the other end of electric capacity C12；nullDescribed second low pass filter includes: amplifier chip U9，It is connected with one end of resistance R20 behind one end of the inverting input shunt-wound capacitance C13 of described amplifier chip U9，Ground connection after the in-phase input end series resistor R21 of described amplifier chip U9，The other end of described resistance R20 one end of connecting resistance R22 are connected with one end with resistance R19 behind one end of electric capacity C14，The other end of described resistance R19 is connected with the outfan of described amplifier chip U8，The other end ground connection of described electric capacity C14，The other end of described resistance R22 is also connected with the outfan of described amplifier chip U9 after connecing the other end of described electric capacity C13，It is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C15 of described amplifier chip U9，It is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C16 of described amplifier chip U9，The other end of described electric capacity C15 and the equal ground connection of the other end of electric capacity C16；Described tertiary voltage follower includes: amplifier chip U10, after the normal phase input end series resistor R23 of described amplifier chip U10, the outfan with described amplifier chip U9 is connected, the inverting input of described amplifier chip U10 is connected with the outfan of described amplifier chip U10, and the outfan of described amplifier chip U10 is connected with the input B1 of described V/I transducer 13.
The model of described amplifier chip U1, amplifier chip U2, amplifier chip U3, amplifier chip U4, amplifier chip U5, amplifier chip U6, amplifier chip U7, amplifier chip U8 and amplifier chip U9 is OP4177ARU, or is OP2177ARMZ.
The present invention compared with prior art has the advantages that
In the present invention, on the one hand, fpga chip produces the adjustable square-wave signal of amplitude through digital regulation resistance, this square-wave signal produces the sine wave signal of characteristic frequency after the first operational amplifier connects band filter, input summer after the first voltage follower again, on the other hand, fpga chip connects the second operational amplifier through DA conversion chip and produces triangular signal, this triangular signal is input summer after the first low pass filter and the second voltage follower, the signal of above-mentioned two input summer outputs signal to the second low pass filter after adder frequency synthesis, this signal eventually passes tertiary voltage follower and exports；Owing to above-mentioned square-wave signal and triangular signal are produced by fpga chip, belong to homologous signal so that the phase noise of two input signals has and significantly reduces, and improves the measurement performance of whole system；By the regulating element in the band filter of frequency-adjustable, the mid frequency of band filter can be regulated real-time and accurately, the output frequency of the laser-driven signal generator of flexible laser gas analyzer, to find the carrier frequency output meeting system optimal performance；By digital regulation resistance, the first low pass filter and the second low pass filter so that the output frequency of the laser-driven signal generator of laser gas analyzer has relative broad range, can conveniently realize any N frequency multiplication and the dynamic frequency of carrier signal；In addition, compared to general digital signal generator DDS device, the laser-driven signal generator of the laser gas analyzer in the present invention is analog signal generator, output is analogue signal, overcome the shortcoming that DA quantizing noise is big, make the laser instrument input signal precision height in laser on-line gas analysis system, noise low and good stability.
Accompanying drawing explanation
The present invention will be further described in detail below in conjunction with the accompanying drawings；
Fig. 1 is the electrical block diagram of the present invention；
Fig. 2 is the circuit theory diagrams of the present invention；
In figure: 1 is fpga chip, 2 is digital regulation resistance, and 3 is DA conversion chip, 4 is the first operational amplifier, 5 is band filter, and 6 is the first voltage follower, and 7 is the second operational amplifier, 8 is the first low pass filter, 9 is the second voltage follower, and 10 is adder, and 11 is the second low pass filter, 12 is tertiary voltage follower, and 13 is V/I transducer.
Detailed description of the invention
nullAs shown in Figure 1，The laser-driven signal generator of laser gas analyzer，Including: fpga chip 1，Two signal output parts of described fpga chip 1 are connected with digital regulation resistance 2 and DA conversion chip 3 respectively，Described digital regulation resistance 2 is connected with the first operational amplifier 4，Described first operational amplifier 4 is connected with the band filter 5 of frequency-adjustable，Described band filter 5 is connected with the first voltage follower 6，Described DA conversion chip 3 is connected with the second operational amplifier 7，Described second operational amplifier 7 is connected with the first low pass filter 8，Described first low pass filter 8 is connected with the second voltage follower 9，Described second voltage follower 9 is all connected with adder 10 with the first voltage follower 6，Described adder 10 is connected with the second low pass filter 11，Described second low pass filter 11 is connected with tertiary voltage follower 12，Owing to laser instrument is current driving apparatus，And tertiary voltage follower 12 generation is voltage signal，So needing by converter, voltage signal is converted to the current signal needed for laser instrument，Therefore described tertiary voltage follower 12 is also connected with V/I transducer 13，And the outfan that outfan is described signal generator of described V/I transducer 13.
As shown in Figure 2, described first operational amplifier 4 includes: amplifier chip U1, after the in-phase input end series resistor R1 of described amplifier chip U1, the output terminals A 1 with described digital regulation resistance 2 is connected, it is connected with one end of resistance R3 after the described inverting input of amplifier chip U1 one end of connecting resistance R2, the other end ground connection of described resistance R2, the other end of described resistance R3 is connected with the outfan of described amplifier chip U1, it is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C1 of described amplifier chip U1, it is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C2 of described amplifier chip U1, the other end of described electric capacity C1 and the equal ground connection of the other end of electric capacity C2；In the present embodiment, described amplifier chip U1 constitutes the operational amplification circuit of adjustable gain with resistance R1, resistance R2 and resistance R3, can be changed the amplification of this operational amplification circuit by the resistance of regulation resistance R1, resistance R2 and resistance R3, electric capacity C1 and electric capacity C2 is that the power supply of amplifier chip U1 is filtered.
nullDescribed band filter 5 includes: amplifier chip U2、Amplifier chip U3 and amplifier chip U4，The inverting input of described amplifier chip U2 one end of connecting resistance R4、One end of resistance R5、It is connected with one end of electric capacity C4 after the end fixing with of adjustable resistance RP1 of one end of electric capacity C3，The other end of described resistance R4 is connected with the outfan of described amplifier chip U1，The other end of the other end shunt-wound capacitance C3 of described resistance R5 is connected with one end with resistance R6 after the outfan of amplifier chip U2，The other end of described resistance R6 is also connected with one end of resistance R7 after connecing the inverting input of described amplifier chip U3，The other end of another fixing end shunt-wound capacitance C4 of described adjustable resistance RP1 is connected with outfan with described amplifier chip U4 behind one end of electric capacity C5，The other end of described electric capacity C5 and after connecing the inverting input of described amplifier chip U4 end fixing with of variable resistance RP2 be connected，Another fixing end of described variable resistance RP2 also connects the other end of described resistance R7 and is connected with one end of electric capacity C6 after the outfan of described amplifier chip U3，The in-phase input end of described amplifier chip U2、The in-phase input end of described amplifier chip U3 and the equal ground connection of in-phase input end of described amplifier chip U4；In the present embodiment, described amplifier chip U4, electric capacity C5 and variable resistance RP2 are integrating circuit, feedback network is constituted with electric capacity C4 and adjustable resistance RP1, feed back to the inverting input of amplifier chip U2, it is monolithically fabricated the bandwidth-limited circuit of frequency-adjustable, realizes frequency-adjustable by the resistance adjusting adjustable resistance RP1 and variable resistance RP2.
Circuit is played the effect of buffering isolation by described first voltage follower 6, including: amplifier chip U5, it is connected with one end of resistance R9 after the described in-phase input end of amplifier chip U5 one end of connecting resistance R8, the other end of described resistance R8 is connected with the other end of described electric capacity C6, the other end ground connection of described resistance R9, the inverting input of described amplifier chip U5 is also connected with one end of resistance R10 after connecing the outfan of described amplifier chip U5.
nullDescribed first low pass filter 8 includes: amplifier chip U6，It is connected with one end of resistance R11 behind one end of the inverting input shunt-wound capacitance C7 of described amplifier chip U6，Ground connection after the in-phase input end series resistor R12 of described amplifier chip U6，The other end of described resistance R11 one end of connecting resistance R13 are connected with one end with resistance R14 behind one end of electric capacity C8，The other end of described resistance R14 is connected with the output terminals A 2 of described second operational amplifier (7)，The other end ground connection of described electric capacity C8，The other end of described resistance R13 is also connected with the outfan of described amplifier chip U6 after connecing the other end of described electric capacity C7，It is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C9 of described amplifier chip U6，It is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C10 of described amplifier chip U6，The other end of described electric capacity C9 and the equal ground connection of the other end of electric capacity C10；In the present embodiment, electric capacity C9 and electric capacity C10 is the electric power incoming line filtering of amplifier chip U6, and described first low pass filter 8 is second order multiple feedback low pass filter, and the low-pass filtering of second order is more preferable compared to its effect of the low-pass filtering of single order.
Circuit is played the effect of buffering isolation by described second voltage follower 9, including: amplifier chip U7, after the in-phase input end series resistor R15 of described amplifier chip U7, the outfan with described amplifier chip U6 is connected, and the inverting input of described amplifier chip U7 is also connected with one end of resistance R16 after connecing the outfan of described amplifier chip U7.
Described adder 10 includes: amplifier chip U8, the in-phase input end of described amplifier chip U8 is also connected with the other end of described resistance R16 after connecing the other end of described resistance R10, it is connected with one end of resistance R18 after the described inverting input of amplifier chip U8 one end of connecting resistance R17, the other end ground connection of described resistance R17, the other end of described resistance R18 is connected with the outfan of described amplifier chip U8, it is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C11 of described amplifier chip U8, it is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C12 of described amplifier chip U8, the other end of described electric capacity C11 and the equal ground connection of the other end of electric capacity C12；In the present embodiment, electric capacity C11 and electric capacity C12 is the electric power incoming line filtering of amplifier chip U8, and resistance R17 and resistance R18 constitutes feedback circuit.
nullThe function of described second low pass filter 11 is identical with the first low pass filter 8，Including: amplifier chip U9，It is connected with one end of resistance R20 behind one end of the inverting input shunt-wound capacitance C13 of described amplifier chip U9，Ground connection after the in-phase input end series resistor R21 of described amplifier chip U9，The other end of described resistance R20 one end of connecting resistance R22 are connected with one end with resistance R19 behind one end of electric capacity C14，The other end of described resistance R19 is connected with the outfan of described amplifier chip U8，The other end ground connection of described electric capacity C14，The other end of described resistance R22 is also connected with the outfan of described amplifier chip U9 after connecing the other end of described electric capacity C13，It is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C15 of described amplifier chip U9，It is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C16 of described amplifier chip U9，The other end of described electric capacity C15 and the equal ground connection of the other end of electric capacity C16；
Circuit is played the effect of buffering isolation by described tertiary voltage follower 12, including: amplifier chip U10, after the normal phase input end series resistor R23 of described amplifier chip U10, the outfan with described amplifier chip U9 is connected, the inverting input of described amplifier chip U10 is connected with the outfan of described amplifier chip U10, and the outfan of described amplifier chip U10 is connected with the input B1 of described V/I transducer 13；Specifically, the model of described amplifier chip U1, amplifier chip U2, amplifier chip U3, amplifier chip U4, amplifier chip U5, amplifier chip U6, amplifier chip U7, amplifier chip U8 and amplifier chip U9 is OP4177ARU, or is OP2177ARMZ.
The operation principle of the laser-driven signal generator of the laser gas analyzer in the present invention is as follows: fpga chip 1 produces square-wave signal through digital regulation resistance 2, and fpga chip 1 connects the second operational amplifier 7 through DA conversion chip 3 and produces triangular signal；Square-wave signal inputs the first operational amplifier 4 and carries out signal amplification, improve gain, band filter 5 through Frequency Adjustable is filtered, filtering noise jamming and unwanted frequency range obtains the sine wave signal of special frequency channel, sine wave signal enters after signal is isolated by the first voltage follower 6 and is input to adder 10；Triangular signal inputs the first low pass filter 8, filters noise jamming and unwanted frequency range, and the signal leached enters after signal is isolated by the second voltage follower 9 and is input to adder 10；The signal of two input summers 10 is through adder 10 frequency synthesis, produce laser-driven signal to filter through the second low pass filter 11, filtering noise jamming and unwanted frequency range, the signal leached produces required output signal after entering tertiary voltage follower 12.
Laser-driven signal generator compared to other conventional laser gas analyzers, the square-wave signal of the drive signal generator in the present invention have employed the PLL frequency multiplication output within high-performance FPGA, making signal output frequency scope is 0.001Hz ~ 100KHz, cycle precision reaches 10ns, signal Jitter is noise control within 100ps, the sinusoidal wave signal to noise ratio (snr) that can make drive signal generator increases substantially to more than 80dB, the sinusoidal wave phase accuracy making this drive signal generator reaches 10ns, sine wave signal corresponding to 1kHz, its phase controlling precision has reached 2 π/105；Owing to the drive signal generator in the present invention uses homologous signal, the precision and stability of the frequency of laser-driven signal can be improved after computing circuit, improve frequency resolution, follow the tracks of, respond and conversion rate, there is wider tuning range, volume power consumption declines, easy to use, improve the overall performance of laser on-line gas analysis system, there is prominent substantive distinguishing features and significantly progress；Above in conjunction with accompanying drawing, embodiments of the invention are explained in detail, but the present invention is not limited to above-described embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible to various changes can be made on the premise of without departing from present inventive concept.
Claims (3)
- null1. the laser-driven signal generator of laser gas analyzer，It is characterized in that: including: fpga chip (1)，Two signal output parts of described fpga chip (1) are connected with digital regulation resistance (2) and DA conversion chip (3) respectively，Described digital regulation resistance (2) is connected with the first operational amplifier (4)，Described first operational amplifier (4) is connected with the band filter (5) of frequency-adjustable，Described band filter (5) is connected with the first voltage follower (6)，Described DA conversion chip (3) is connected with the second operational amplifier (7)，Described second operational amplifier (7) is connected with the first low pass filter (8)，Described first low pass filter (8) is connected with the second voltage follower (9)，Described second voltage follower (9) is all connected with adder (10) with the first voltage follower (6)，Described adder (10) is connected with the second low pass filter (11)，Described second low pass filter (11) is connected with tertiary voltage follower (12)，Described tertiary voltage follower (12) is connected with V/I transducer (13)，The outfan that outfan is described signal generator of described V/I transducer (13).
- nullThe laser-driven signal generator of laser gas analyzer the most according to claim 1，It is characterized in that: described first operational amplifier (4) including: amplifier chip U1，After the in-phase input end series resistor R1 of described amplifier chip U1, the output terminals A 1 with described digital regulation resistance (2) is connected，It is connected with one end of resistance R3 after the described inverting input of amplifier chip U1 one end of connecting resistance R2，The other end ground connection of described resistance R2，The other end of described resistance R3 is connected with the outfan of described amplifier chip U1，It is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C1 of described amplifier chip U1，It is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C2 of described amplifier chip U1，The other end of described electric capacity C1 and the equal ground connection of the other end of electric capacity C2；nullDescribed band filter (5) including: amplifier chip U2、Amplifier chip U3 and amplifier chip U4，The inverting input of described amplifier chip U2 one end of connecting resistance R4、One end of resistance R5、It is connected with one end of electric capacity C4 after the end fixing with of adjustable resistance RP1 of one end of electric capacity C3，The other end of described resistance R4 is connected with the outfan of described amplifier chip U1，The other end of the other end shunt-wound capacitance C3 of described resistance R5 is connected with one end with resistance R6 after the outfan of amplifier chip U2，The other end of described resistance R6 is also connected with one end of resistance R7 after connecing the inverting input of described amplifier chip U3，The other end of another fixing end shunt-wound capacitance C4 of described adjustable resistance RP1 is connected with outfan with described amplifier chip U4 behind one end of electric capacity C5，The other end of described electric capacity C5 and after connecing the inverting input of described amplifier chip U4 end fixing with of variable resistance RP2 be connected，Another fixing end of described variable resistance RP2 also connects the other end of described resistance R7 and is connected with one end of electric capacity C6 after the outfan of described amplifier chip U3，The in-phase input end of described amplifier chip U2、The in-phase input end of described amplifier chip U3 and the equal ground connection of in-phase input end of described amplifier chip U4；Described first voltage follower (6) including: amplifier chip U5, it is connected with one end of resistance R9 after the described in-phase input end of amplifier chip U5 one end of connecting resistance R8, the other end of described resistance R8 is connected with the other end of described electric capacity C6, the other end ground connection of described resistance R9, the inverting input of described amplifier chip U5 is also connected with one end of resistance R10 after connecing the outfan of described amplifier chip U5；nullDescribed first low pass filter (8) including: amplifier chip U6，It is connected with one end of resistance R11 behind one end of the inverting input shunt-wound capacitance C7 of described amplifier chip U6，Ground connection after the in-phase input end series resistor R12 of described amplifier chip U6，The other end of described resistance R11 one end of connecting resistance R13 are connected with one end with resistance R14 behind one end of electric capacity C8，The other end of described resistance R14 is connected with the output terminals A 2 of described second operational amplifier (7)，The other end ground connection of described electric capacity C8，The other end of described resistance R13 is also connected with the outfan of described amplifier chip U6 after connecing the other end of described electric capacity C7，It is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C9 of described amplifier chip U6，It is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C10 of described amplifier chip U6，The other end of described electric capacity C9 and the equal ground connection of the other end of electric capacity C10；Described second voltage follower (9) including: amplifier chip U7, after the in-phase input end series resistor R15 of described amplifier chip U7, the outfan with described amplifier chip U6 is connected, and the inverting input of described amplifier chip U7 is also connected with one end of resistance R16 after connecing the outfan of described amplifier chip U7；Described adder (10) including: amplifier chip U8, the in-phase input end of described amplifier chip U8 is also connected with the other end of described resistance R16 after connecing the other end of described resistance R10, it is connected with one end of resistance R18 after the described inverting input of amplifier chip U8 one end of connecting resistance R17, the other end ground connection of described resistance R17, the other end of described resistance R18 is connected with the outfan of described amplifier chip U8, it is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C11 of described amplifier chip U8, it is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C12 of described amplifier chip U8, the other end of described electric capacity C11 and the equal ground connection of the other end of electric capacity C12；nullDescribed second low pass filter (11) including: amplifier chip U9，It is connected with one end of resistance R20 behind one end of the inverting input shunt-wound capacitance C13 of described amplifier chip U9，Ground connection after the in-phase input end series resistor R21 of described amplifier chip U9，The other end of described resistance R20 one end of connecting resistance R22 are connected with one end with resistance R19 behind one end of electric capacity C14，The other end of described resistance R19 is connected with the outfan of described amplifier chip U8，The other end ground connection of described electric capacity C14，The other end of described resistance R22 is also connected with the outfan of described amplifier chip U9 after connecing the other end of described electric capacity C13，It is connected with-5V voltage behind one end of the power supply negative terminal shunt-wound capacitance C15 of described amplifier chip U9，It is connected with+5V voltage behind one end of the power positive end shunt-wound capacitance C16 of described amplifier chip U9，The other end of described electric capacity C15 and the equal ground connection of the other end of electric capacity C16；Described tertiary voltage follower (12) including: amplifier chip U10, after the normal phase input end series resistor R23 of described amplifier chip U10, the outfan with described amplifier chip U9 is connected, the inverting input of described amplifier chip U10 is connected with the outfan of described amplifier chip U10, and the outfan of described amplifier chip U10 is connected with the input B1 of described V/I transducer (13).
- The laser-driven signal generator of laser gas analyzer the most according to claim 2, it is characterized in that: the model of described amplifier chip U1, amplifier chip U2, amplifier chip U3, amplifier chip U4, amplifier chip U5, amplifier chip U6, amplifier chip U7, amplifier chip U8 and amplifier chip U9 is OP4177ARU, or is OP2177ARMZ.
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| CN110768722A (en) * | 2019-11-20 | 2020-02-07 | 西北核技术研究院 | Radiation detection broadband analog optical fiber transmission system |
| CN112104205A (en) * | 2020-08-14 | 2020-12-18 | 西安工程大学 | Full-bridge inverter circuit grid driving circuit with midpoint voltage tracking function |
| CN112636710B (en) * | 2021-01-31 | 2022-07-19 | 山西大学 | Phase-locked amplifier suitable for laser frequency locking |
| CN116660208B (en) * | 2023-05-30 | 2024-01-09 | 埃尔法(山东)仪器有限公司 | Laser gas detection circuit and gas detector |
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| CN1770284A (en) * | 2004-11-02 | 2006-05-10 | 联发科技股份有限公司 | Optical storage system having integrated laser driver signal processor |
| CN103368657A (en) * | 2013-06-28 | 2013-10-23 | 华东师范大学 | Weak correlation single photon source producing method used in gigahertz quantum secret communication system |
| CN204008457U (en) * | 2014-08-16 | 2014-12-10 | 山西森达源科技有限公司 | A kind of laser-driven signal generator of laser gas analyzer |
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| CN1770284A (en) * | 2004-11-02 | 2006-05-10 | 联发科技股份有限公司 | Optical storage system having integrated laser driver signal processor |
| CN103368657A (en) * | 2013-06-28 | 2013-10-23 | 华东师范大学 | Weak correlation single photon source producing method used in gigahertz quantum secret communication system |
| CN204008457U (en) * | 2014-08-16 | 2014-12-10 | 山西森达源科技有限公司 | A kind of laser-driven signal generator of laser gas analyzer |
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