CN104165862A - Laser driving signal generator of laser gas analyzer - Google Patents
Laser driving signal generator of laser gas analyzer Download PDFInfo
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- CN104165862A CN104165862A CN201410402516.9A CN201410402516A CN104165862A CN 104165862 A CN104165862 A CN 104165862A CN 201410402516 A CN201410402516 A CN 201410402516A CN 104165862 A CN104165862 A CN 104165862A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 68
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Abstract
The invention relates to a laser driving signal generator of a laser gas analyzer, which is low in noise, flexible in adjustment on output frequency and wide in range of output frequency. According to the technical scheme, two signal output ends of an FPGA chip are connected with a digital potentiometer and a DA conversion chip, respectively; the digital potentiometer is connected with a first operational amplifier; the first operational amplifier is connected with a frequency adjustable band-pass filter; the band-pass filter is connected with a first voltage follower; the DA conversion chip is connected with a second operational amplifier; the second operational amplifier is connected with a first low-pass filter; the first low-pass filter is connected with a second voltage follower; both the second voltage follower and the first voltage follower are connected with an adder; the adder is connected with a second low-pass filter; the second low-pass filter is connected with a third voltage follower; an output end of the third voltage follower is also an output end of the signal generator. The laser driving signal generator of the laser gas analyzer is suitable for the field of circuit systems.
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 adopting has two kinds: direct absorption spectroscopy techniques and Wavelength modulation spectroscopy technology (WMS), compared to direct absorption spectroscopy techniques, Wavelength modulation spectroscopy technology (WMS) can improve 100 ~ 1000 times by the measurement sensitivity of system, and its gordian technique is: realize the driving of the noiselike signal of laser instrument and demodulation; External Distributed Feedback Laser is by force 10 at the Absorption Line of the corresponding CO gas of 2234nm wave band
-21the order of magnitude, system wants to reach the detection sensitivity of ppb level gas, the current noise of its front-end circuit drive part should be less than 2 μ A, and the amplitude noise of signal generator and the signal to noise ratio (snr) of phase noise of the artificial circuit part of V-I part should meet more than 80dB; And laser-driven signal is directly connected to the spectral noise of laser instrument, can affect the stability of laser instrument, and even affect measurement performance, the signal to noise ratio (S/N ratio) of whole system and measure sensitivity, so the amplitude noise of the laser-driven signal generator of laser gas analyzer, Jitter noise and temperature are floated the accuracy of measurement that characteristic will directly affect whole system.
Laser-driven signal is obtained after frequency synthesis by two unlike signals in fact, conventional frequency synthesis technique has direct-type, Direct Digital and hybrid, and on market general digital frequency synthesizer DDS chip due to be limited to DA quantizing noise, with the factor such as system scan signal is non-homogeneous driving, be difficult to meet the demand of system; The laser-driven signal generator of the laser gas analyzer that therefore, low noise, output frequency can flexible, reference frequency output is wider and output waveform signals is more stable seems particularly important.
Summary of the invention
The present invention overcomes the deficiency that prior art exists, and technical matters to be solved is: the laser-driven signal generator of the laser gas analyzer of provide that a kind of noise is lower, output frequency can flexible, reference frequency output is wider.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: the laser-driven signal generator of laser gas analyzer, comprise: fpga chip, two signal output parts of described fpga chip are connected with DA conversion chip with digital regulation resistance respectively, described digital regulation resistance is connected with the first operational amplifier, described the first operational amplifier bandpass filter adjustable with frequency is connected, described bandpass filter is connected with the first voltage follower, described DA conversion chip is connected with the second operational amplifier, described the second operational amplifier is connected with the first low-pass filter, described the first low-pass filter is connected with second voltage follower, described second voltage follower is all connected with totalizer with the first voltage follower, described totalizer is connected with the second low-pass filter, described the second low-pass filter is connected with tertiary voltage follower, described tertiary voltage follower is connected with V/I converter, the output terminal of described V/I converter is the output terminal of described signal generator.
Described the first operational amplifier comprises: amplifier chip U1, after the in-phase input end series resistor R1 of described amplifier chip U1, be connected with the output terminals A 1 of described digital regulation resistance, behind the inverting input of described amplifier chip U1 one end of connecting resistance R2, be connected with one end of resistance R 3, the other end ground connection of described resistance R 2, the other end of described resistance R 3 is connected with the output terminal of described amplifier chip U1, behind one end of the power supply negative terminal shunt-wound capacitance C1 of described amplifier chip U1, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C2 of described amplifier chip U1, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 1 and capacitor C 2, described bandpass filter comprises: 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 R 5, after a stiff end of one end of capacitor C 3 and adjustable resistance RP1, be connected with one end of capacitor C 4, the other end of described resistance R 4 is connected with the output terminal of described amplifier chip U1, after the other end of other end shunt-wound capacitance C3 of described resistance R 5 and the output terminal of amplifier chip U2, be connected with one end of resistance R 6, the other end of described resistance R 6 and connect the inverting input of described amplifier chip U3 after be connected with one end of resistance R 7, behind the other end of another stiff end shunt-wound capacitance C4 of described adjustable resistance RP1 and one end of capacitor C 5, be connected with the output terminal of described amplifier chip U4, the other end of described capacitor C 5 and connect the inverting input of described amplifier chip U4 after be connected with a stiff end of variable resistor RP2, another stiff end of described variable resistor RP2 and connect the other end of described resistance R 7 and the output terminal of described amplifier chip U3 after be connected with one end of capacitor C 6, the in-phase input end of described amplifier chip U2, the equal ground connection of in-phase input end of the in-phase input end of described amplifier chip U3 and described amplifier chip U4, described the first voltage follower comprises: amplifier chip U5, behind the in-phase input end of described amplifier chip U5 one end of connecting resistance R8, be connected with one end of resistance R 9, the other end of described resistance R 8 is connected with the other end of described capacitor C 6, the other end ground connection of described resistance R 9, the inverting input of described amplifier chip U5 and connect the output terminal of described amplifier chip U5 after be connected with one end of resistance R 10, described the first low-pass filter comprises: amplifier chip U6, behind one end of the inverting input shunt-wound capacitance C7 of described amplifier chip U6, be connected with one end of resistance R 11, ground connection after the in-phase input end series resistor R12 of described amplifier chip U6, behind one end of one end of the other end of described resistance R 11 connecting resistance R13 and capacitor C 8, be connected with one end of resistance R 14, the other end of described resistance R 14 is connected with the output terminals A 2 of described the second operational amplifier, the other end ground connection of described capacitor C 8, the other end of described resistance R 13 and connect the other end of described capacitor C 7 after be connected with the output terminal of described amplifier chip U6, behind one end of the power supply negative terminal shunt-wound capacitance C9 of described amplifier chip U6, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C10 of described amplifier chip U6, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 9 and capacitor C 10, described second voltage follower comprises: amplifier chip U7, after the in-phase input end series resistor R15 of described amplifier chip U7, be connected with the output terminal of described amplifier chip U6, the inverting input of described amplifier chip U7 and connect the output terminal of described amplifier chip U7 after be connected with one end of resistance R 16, described totalizer comprises: amplifier chip U8, the in-phase input end of described amplifier chip U8 and connect the other end of described resistance R 10 after be connected with the other end of described resistance R 16, behind the inverting input of described amplifier chip U8 one end of connecting resistance R17, be connected with one end of resistance R 18, the other end ground connection of described resistance R 17, the other end of described resistance R 18 is connected with the output terminal of described amplifier chip U8, behind one end of the power supply negative terminal shunt-wound capacitance C11 of described amplifier chip U8, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C12 of described amplifier chip U8, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 11 and capacitor C 12, described the second low-pass filter comprises: amplifier chip U9, behind one end of the inverting input shunt-wound capacitance C13 of described amplifier chip U9, be connected with one end of resistance R 20, ground connection after the in-phase input end series resistor R21 of described amplifier chip U9, behind one end of one end of the other end of described resistance R 20 connecting resistance R22 and capacitor C 14, be connected with one end of resistance R 19, the other end of described resistance R 19 is connected with the output terminal of described amplifier chip U8, the other end ground connection of described capacitor C 14, the other end of described resistance R 22 and connect the other end of described capacitor C 13 after be connected with the output terminal of described amplifier chip U9, behind one end of the power supply negative terminal shunt-wound capacitance C15 of described amplifier chip U9, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C16 of described amplifier chip U9, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 15 and capacitor C 16, described tertiary voltage follower comprises: amplifier chip U10, after the normal phase input end series resistor R23 of described amplifier chip U10, be connected with the output terminal of described amplifier chip U9, the inverting input of described amplifier chip U10 is connected with the output terminal of described amplifier chip U10, and the output terminal of described amplifier chip U10 is connected with the input end B1 of described V/I converter 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 following beneficial effect:
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 connecting band bandpass 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 second voltage follower, the signal of above-mentioned two input summers outputs signal to the second low-pass filter after totalizer frequency synthesis, this signal is exported finally by crossing tertiary voltage follower, because above-mentioned square-wave signal and triangular signal produce by fpga chip, belong to same source signal, the phase noise of two input signals is had significantly and reduce, improved the measurement performance of whole system, by the regulating element in the adjustable bandpass filter of frequency, can regulate real-time and accurately the centre frequency of bandpass filter, the output frequency of the laser-driven signal generator of flexible laser gas analyzer, to find the carrier frequency output that meets system optimal performance, by digital regulation resistance, the first low-pass filter and the second low-pass filter, make the output frequency of the laser-driven signal generator of laser gas analyzer there is relative broad range, can conveniently realize any N frequency multiplication and the dynamic frequency of carrier signal, in addition, than general digital signal generator DDS device, the laser-driven signal generator of the laser gas analyzer in the present invention is analog signal generator, what export is simulating signal, overcome the large shortcoming of DA quantizing noise, made that laser instrument input signal precision in laser on-line gas analysis system is high, noise is low and good stability.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail;
Fig. 1 is electrical block diagram of the present invention;
Fig. 2 is 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 bandpass filter, and 6 is the first voltage follower, and 7 is the second operational amplifier, 8 is the first low-pass filter, 9 is second voltage follower, and 10 is totalizer, and 11 is the second low-pass filter, 12 is tertiary voltage follower, and 13 is V/I converter.
Embodiment
As shown in Figure 1, the laser-driven signal generator of laser gas analyzer, comprise: fpga chip 1, two signal output parts of described fpga chip 1 are connected with DA conversion chip 3 with digital regulation resistance 2 respectively, described digital regulation resistance 2 is connected with the first operational amplifier 4, described the first operational amplifier 4 bandpass filter 5 adjustable with frequency is connected, described bandpass filter 5 is connected with the first voltage follower 6, described DA conversion chip 3 is connected with the second operational amplifier 7, described the second operational amplifier 7 is connected with the first low-pass filter 8, described the first low-pass filter 8 is connected with second voltage follower 9, described second voltage follower 9 is all connected with totalizer 10 with the first voltage follower 6, described totalizer 10 is connected with the second low-pass filter 11, described the second low-pass filter 11 is connected with tertiary voltage follower 12, because laser instrument is current driving apparatus, and 12 generations of tertiary voltage follower is voltage signal, so voltage signal need to be converted to the required current signal of laser instrument by converter, therefore described tertiary voltage follower 12 is also connected with V/I converter 13, and the output terminal that the output terminal of described V/I converter 13 is described signal generator.
As shown in Figure 2, described the first operational amplifier 4 comprises: amplifier chip U1, after the in-phase input end series resistor R1 of described amplifier chip U1, be connected with the output terminals A 1 of described digital regulation resistance 2, behind the inverting input of described amplifier chip U1 one end of connecting resistance R2, be connected with one end of resistance R 3, the other end ground connection of described resistance R 2, the other end of described resistance R 3 is connected with the output terminal of described amplifier chip U1, behind one end of the power supply negative terminal shunt-wound capacitance C1 of described amplifier chip U1, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C2 of described amplifier chip U1, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 1 and capacitor C 2, in the present embodiment, described amplifier chip U1 and resistance R 1, resistance R 2 and resistance R 3 form the adjustable operational amplification circuit of gain, can change by the resistance of regulating resistance R1, resistance R 2 and resistance R 3 enlargement factor of this operational amplification circuit, capacitor C 1 and capacitor C 2 are carried out filtering for the power supply of amplifier chip U1.
Described bandpass filter 5 comprises: 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 R 5, after a stiff end of one end of capacitor C 3 and adjustable resistance RP1, be connected with one end of capacitor C 4, the other end of described resistance R 4 is connected with the output terminal of described amplifier chip U1, after the other end of other end shunt-wound capacitance C3 of described resistance R 5 and the output terminal of amplifier chip U2, be connected with one end of resistance R 6, the other end of described resistance R 6 and connect the inverting input of described amplifier chip U3 after be connected with one end of resistance R 7, behind the other end of another stiff end shunt-wound capacitance C4 of described adjustable resistance RP1 and one end of capacitor C 5, be connected with the output terminal of described amplifier chip U4, the other end of described capacitor C 5 and connect the inverting input of described amplifier chip U4 after be connected with a stiff end of variable resistor RP2, another stiff end of described variable resistor RP2 and connect the other end of described resistance R 7 and the output terminal of described amplifier chip U3 after be connected with one end of capacitor C 6, the in-phase input end of described amplifier chip U2, the equal ground connection of in-phase input end of the in-phase input end of described amplifier chip U3 and described amplifier chip U4, in the present embodiment, described amplifier chip U4, capacitor C 5 and variable resistor RP2 are integrating circuit, form feedback network with capacitor C 4 and adjustable resistance RP1, feed back to the inverting input of amplifier chip U2, whole form the adjustable bandwidth-limited circuit of frequency, by adjusting the resistance of adjustable resistance RP1 and variable resistor RP2, to realize frequency adjustable.
6 pairs of circuit of described the first voltage follower play buffer compartment from effect, comprise: amplifier chip U5, behind the in-phase input end of described amplifier chip U5 one end of connecting resistance R8, be connected with one end of resistance R 9, the other end of described resistance R 8 is connected with the other end of described capacitor C 6, the other end ground connection of described resistance R 9, the inverting input of described amplifier chip U5 and connect the output terminal of described amplifier chip U5 after be connected with one end of resistance R 10.
Described the first low-pass filter 8 comprises: amplifier chip U6, behind one end of the inverting input shunt-wound capacitance C7 of described amplifier chip U6, be connected with one end of resistance R 11, ground connection after the in-phase input end series resistor R12 of described amplifier chip U6, behind one end of one end of the other end of described resistance R 11 connecting resistance R13 and capacitor C 8, be connected with one end of resistance R 14, the other end of described resistance R 14 is connected with the output terminals A 2 of described the second operational amplifier (7), the other end ground connection of described capacitor C 8, the other end of described resistance R 13 and connect the other end of described capacitor C 7 after be connected with the output terminal of described amplifier chip U6, behind one end of the power supply negative terminal shunt-wound capacitance C9 of described amplifier chip U6, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C10 of described amplifier chip U6, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 9 and capacitor C 10, in the present embodiment, capacitor C 9 and capacitor C 10 are the electric power incoming line filtering of amplifier chip U6, and described the first low-pass filter 8 is second order multiple feedback low-pass filter, and the low-pass filtering of second order is compared to its better effects if of low-pass filtering of single order.
9 pairs of circuit of described second voltage follower play buffer compartment from effect, comprise: amplifier chip U7, after the in-phase input end series resistor R15 of described amplifier chip U7, be connected with the output terminal of described amplifier chip U6, the inverting input of described amplifier chip U7 and connect the output terminal of described amplifier chip U7 after be connected with one end of resistance R 16.
Described totalizer 10 comprises: amplifier chip U8, the in-phase input end of described amplifier chip U8 and connect the other end of described resistance R 10 after be connected with the other end of described resistance R 16, behind the inverting input of described amplifier chip U8 one end of connecting resistance R17, be connected with one end of resistance R 18, the other end ground connection of described resistance R 17, the other end of described resistance R 18 is connected with the output terminal of described amplifier chip U8, behind one end of the power supply negative terminal shunt-wound capacitance C11 of described amplifier chip U8, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C12 of described amplifier chip U8, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 11 and capacitor C 12, in the present embodiment, capacitor C 11 and capacitor C 12 are the electric power incoming line filtering of amplifier chip U8, and resistance R 17 and resistance R 18 form backfeed loop.
The function of described the second low-pass filter 11 is identical with the first low-pass filter 8, comprise: amplifier chip U9, behind one end of the inverting input shunt-wound capacitance C13 of described amplifier chip U9, be connected with one end of resistance R 20, ground connection after the in-phase input end series resistor R21 of described amplifier chip U9, behind one end of one end of the other end of described resistance R 20 connecting resistance R22 and capacitor C 14, be connected with one end of resistance R 19, the other end of described resistance R 19 is connected with the output terminal of described amplifier chip U8, the other end ground connection of described capacitor C 14, the other end of described resistance R 22 and connect the other end of described capacitor C 13 after be connected with the output terminal of described amplifier chip U9, behind one end of the power supply negative terminal shunt-wound capacitance C15 of described amplifier chip U9, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C16 of described amplifier chip U9, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 15 and capacitor C 16,
12 pairs of circuit of described tertiary voltage follower play buffer compartment from effect, comprise: amplifier chip U10, after the normal phase input end series resistor R23 of described amplifier chip U10, be connected with the output terminal of described amplifier chip U9, the inverting input of described amplifier chip U10 is connected with the output terminal of described amplifier chip U10, and the output terminal of described amplifier chip U10 is connected with the input end B1 of described V/I converter 13; Particularly, 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 principle of work 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 is inputted the first operational amplifier 4 and is carried out signal amplification, improve gain, bandpass filter 5 through Frequency Adjustable is carried out filtering, filtering noise interference and unwanted frequency range obtain the sine wave signal of special frequency channel, and sine wave signal is input to totalizer 10 after entering 6 pairs of signals isolation of the first voltage follower; Triangular signal is inputted the first low-pass filter 8, and filtering noise disturbs and unwanted frequency range, and the signal leaching is input to totalizer 10 after entering 9 pairs of signal isolation of second voltage follower; The signal of two input summers 10 is through totalizer 10 frequency synthesis, produce laser-driven signal through the second low-pass filter 11 filtering, filtering noise disturbs and unwanted frequency range, and the signal leaching enters the needed output signal of the rear generation of 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 has adopted the PLL frequency multiplication output of high-performance FPGA inside, making signal output frequency scope is 0.001Hz ~ 100KHz, cycle precision reaches 10ns, signal Jitter noise is controlled in 100ps, can make the sinusoidal wave signal to noise ratio (snr) of drive signal generator increase substantially to more than 80dB, make the sinusoidal wave phase accuracy of this drive signal generator reach 10ns, sine wave signal corresponding to 1kHz, its phase control precision has reached 2 π/10
5, because the drive signal generator in the present invention adopts same source signal, after computing circuit, can improve the precision and stability of the frequency of laser-driven signal, improve frequency resolution, tracking, response and conversion rate, there is wider tuning range, volume power consumption declines, easy to use, improved the overall performance of laser on-line gas analysis system, there is outstanding substantive distinguishing features and significant progressive, by reference to the accompanying drawings embodiments of the invention are explained in detail above, but the present invention is not limited to above-described embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, makes various variations.
Claims (3)
1. the laser-driven signal generator of laser gas analyzer, it is characterized in that: comprising: fpga chip (1), two signal output parts of described fpga chip (1) are connected with DA conversion chip (3) with digital regulation resistance (2) respectively, described digital regulation resistance (2) is connected with the first operational amplifier (4), the bandpass filter (5) that described the first operational amplifier (4) is adjustable with frequency is connected, described bandpass filter (5) is connected with the first voltage follower (6), described DA conversion chip (3) is connected with the second operational amplifier (7), described the second operational amplifier (7) is connected with the first low-pass filter (8), described the first low-pass filter (8) is connected with second voltage follower (9), described second voltage follower (9) is all connected with totalizer (10) with the first voltage follower (6), described totalizer (10) is connected with the second low-pass filter (11), described the second low-pass filter (11) is connected with tertiary voltage follower (12), described tertiary voltage follower (12) is connected with V/I converter (13), the output terminal that the output terminal of described V/I converter (13) is described signal generator.
2. the laser-driven signal generator of laser gas analyzer according to claim 1, it is characterized in that: described the first operational amplifier (4) comprising: amplifier chip U1, after the in-phase input end series resistor R1 of described amplifier chip U1, be connected with the output terminals A 1 of described digital regulation resistance (2), behind the inverting input of described amplifier chip U1 one end of connecting resistance R2, be connected with one end of resistance R 3, the other end ground connection of described resistance R 2, the other end of described resistance R 3 is connected with the output terminal of described amplifier chip U1, behind one end of the power supply negative terminal shunt-wound capacitance C1 of described amplifier chip U1, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C2 of described amplifier chip U1, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 1 and capacitor C 2,
Described bandpass filter (5) comprising: 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 R 5, after a stiff end of one end of capacitor C 3 and adjustable resistance RP1, be connected with one end of capacitor C 4, the other end of described resistance R 4 is connected with the output terminal of described amplifier chip U1, after the other end of other end shunt-wound capacitance C3 of described resistance R 5 and the output terminal of amplifier chip U2, be connected with one end of resistance R 6, the other end of described resistance R 6 and connect the inverting input of described amplifier chip U3 after be connected with one end of resistance R 7, behind the other end of another stiff end shunt-wound capacitance C4 of described adjustable resistance RP1 and one end of capacitor C 5, be connected with the output terminal of described amplifier chip U4, the other end of described capacitor C 5 and connect the inverting input of described amplifier chip U4 after be connected with a stiff end of variable resistor RP2, another stiff end of described variable resistor RP2 and connect the other end of described resistance R 7 and the output terminal of described amplifier chip U3 after be connected with one end of capacitor C 6, the in-phase input end of described amplifier chip U2, the equal ground connection of in-phase input end of the in-phase input end of described amplifier chip U3 and described amplifier chip U4,
Described the first voltage follower (6) comprising: amplifier chip U5, behind the in-phase input end of described amplifier chip U5 one end of connecting resistance R8, be connected with one end of resistance R 9, the other end of described resistance R 8 is connected with the other end of described capacitor C 6, the other end ground connection of described resistance R 9, the inverting input of described amplifier chip U5 and connect the output terminal of described amplifier chip U5 after be connected with one end of resistance R 10;
Described the first low-pass filter (8) comprising: amplifier chip U6, behind one end of the inverting input shunt-wound capacitance C7 of described amplifier chip U6, be connected with one end of resistance R 11, ground connection after the in-phase input end series resistor R12 of described amplifier chip U6, behind one end of one end of the other end of described resistance R 11 connecting resistance R13 and capacitor C 8, be connected with one end of resistance R 14, the other end of described resistance R 14 is connected with the output terminals A 2 of described the second operational amplifier (7), the other end ground connection of described capacitor C 8, the other end of described resistance R 13 and connect the other end of described capacitor C 7 after be connected with the output terminal of described amplifier chip U6, behind one end of the power supply negative terminal shunt-wound capacitance C9 of described amplifier chip U6, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C10 of described amplifier chip U6, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 9 and capacitor C 10,
Described second voltage follower (9) comprising: amplifier chip U7, after the in-phase input end series resistor R15 of described amplifier chip U7, be connected with the output terminal of described amplifier chip U6, the inverting input of described amplifier chip U7 and connect the output terminal of described amplifier chip U7 after be connected with one end of resistance R 16;
Described totalizer (10) comprising: amplifier chip U8, the in-phase input end of described amplifier chip U8 and connect the other end of described resistance R 10 after be connected with the other end of described resistance R 16, behind the inverting input of described amplifier chip U8 one end of connecting resistance R17, be connected with one end of resistance R 18, the other end ground connection of described resistance R 17, the other end of described resistance R 18 is connected with the output terminal of described amplifier chip U8, behind one end of the power supply negative terminal shunt-wound capacitance C11 of described amplifier chip U8, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C12 of described amplifier chip U8, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 11 and capacitor C 12,
Described the second low-pass filter (11) comprising: amplifier chip U9, behind one end of the inverting input shunt-wound capacitance C13 of described amplifier chip U9, be connected with one end of resistance R 20, ground connection after the in-phase input end series resistor R21 of described amplifier chip U9, behind one end of one end of the other end of described resistance R 20 connecting resistance R22 and capacitor C 14, be connected with one end of resistance R 19, the other end of described resistance R 19 is connected with the output terminal of described amplifier chip U8, the other end ground connection of described capacitor C 14, the other end of described resistance R 22 and connect the other end of described capacitor C 13 after be connected with the output terminal of described amplifier chip U9, behind one end of the power supply negative terminal shunt-wound capacitance C15 of described amplifier chip U9, be connected with-5V voltage, behind one end of the power positive end shunt-wound capacitance C16 of described amplifier chip U9, be connected with+5V voltage, the equal ground connection of the other end of the other end of described capacitor C 15 and capacitor C 16,
Described tertiary voltage follower (12) comprising: amplifier chip U10, after the normal phase input end series resistor R23 of described amplifier chip U10, be connected with the output terminal of described amplifier chip U9, the inverting input of described amplifier chip U10 is connected with the output terminal of described amplifier chip U10, and the output terminal of described amplifier chip U10 is connected with the input end B1 of described V/I converter (13).
3. the laser-driven signal generator of laser gas analyzer 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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| CN112636710A (en) * | 2021-01-31 | 2021-04-09 | 山西大学 | Phase-locked amplifier suitable for laser frequency locking |
| CN116660208A (en) * | 2023-05-30 | 2023-08-29 | 埃尔法(山东)仪器有限公司 | Laser gas detection circuit and gas detector |
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