CN104967444A - Digital phase-locked hardware circuit for elastic-optic modulation - Google Patents
Digital phase-locked hardware circuit for elastic-optic modulation Download PDFInfo
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- CN104967444A CN104967444A CN201510426685.0A CN201510426685A CN104967444A CN 104967444 A CN104967444 A CN 104967444A CN 201510426685 A CN201510426685 A CN 201510426685A CN 104967444 A CN104967444 A CN 104967444A
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Abstract
The invention relates to a digital phase-locked hardware circuit for elastic-optic modulation, which belongs to the technical field of hardware realization of the elastic-optic modulation technology. The circuit of the invention is a processing circuit capable of realizing frequency control on an elastic-optic modulation driving signal and capable of carrying out digital phase locking on 1, 2 and 3 frequency doubling signals of a light wave through modulation. The circuit of the invention is a hardware circuit capable of ensuring frequency consistency between the elastic-optic modulator driving control signal and a digital phase-locked reference signal and carrying out digital phase-locked processing on the signals after modulation. Driving control and data processing of the elastic-optic modulator can be carried out in parallel, the efficiency is high, the accuracy is high, and the real-time performance is good. The circuit comprises an FPGA control and processing module, a high-voltage driving module, an elastic-optic modulator, a detector, an analog signal amplification module, a single-ended to differential module, an AD acquisition module, a USB transmission module, a Labview display module and a power supply module. The circuit of the invention is mainly applied to the elastic-optic modulator aspect.
Description
Technical field
The present invention relates to a kind of digital servo-control hardware circuit for playing light modulation, that one can realize controlling bullet light modulation driving signal frequency, 1,2,3 frequency-doubled signals of the light wave through ovennodulation are carried out to the treatment circuit of digital servo-control, belong to the realization technology field playing light modulation techniques.
Background technology
In the development process of photoelectricity and sensing technology, the situation that small-signal is submerged in strong noise background occurs now and then, lock-in amplifier can be measured the faint amount that other modes cannot be measured, such as micro voltage, micro-electric current etc., be widely used in the multiple fields such as physics, chemistry, biomedicine, remote sensing.
This technology is according to noise and reference signal irrelevance, and the measured signal of being flooded by noise and reference signal have the principle of very high correlation to design.Existing digital PLL, reference channel is needed to provide the phase information required for digital phase-sensitive detector with the sampling rate that signal input channel is identical, therefore to the accuracy of the phase information obtained, tremendous influence is had to the effect of digital servo-control, for existing digital PLL, the reference signal that bullet light modulating signal provides and frequency analog signal are difficult to completely the same, cause the relatively unstable of phase place, affect the accuracy of final data measured.In same FPGA, use multi-channel digital frequency synthesis technique (Direct Digital Synthesis DDS), control by same frequency control word the generation playing optical modulator drive control signal and digital servo-control reference signal.
Summary of the invention
In order to overcome deficiency existing in prior art, there is provided that a kind of to ensure to play optical modulator drive control signal consistent with digital servo-control reference signal frequency and the signal after modulating is carried out to the hardware circuit of digital servo-control process, the drived control of this bullet optical modulator and data processing can walk abreast and carry out, and efficiency is high, accuracy is high, real-time is good.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of digital servo-control hardware circuit for playing light modulation, comprise FPGA to control and processing module, high drive module, play optical modulator, detector, analog signal amplification module, single-ended transfer difference module, AD acquisition module, USB transport module, Labview display module and power module, described FPGA controls and processing module, high drive module, play optical modulator, detector, analog signal amplification module, single-ended transfer difference module, AD acquisition module connects successively, described AD acquisition module and FPGA control to be connected with processing module, described FPGA controls to be connected with Labview display module by USB transport module with processing module.
Described FPGA controls to select EP1C6Q240C8 with the chip of processing module, controls high drive module, analog signal amplification module and AD acquisition module, outputs to Labview display module by after the data processing of adopting back by USB transport module.
Described high drive module comprises power amplification circuit, charging and discharging circuit and impedance matching circuit, described power amplification circuit receives FPGA and controls the control signal with processing module, described charging and discharging circuit provides charging and discharging loop for LC shakes, inductance L and electric capacity C match by described impedance matching circuit, make load circuit resonance, by realizing resonance and voltage amplification to the charging and discharging of electric capacity C.
The bullet luminescent crystal of described bullet optical modulator is zinc selenide, under the control that FPGA controls with processing module, be operated in resonance condition.
The model of described detector is PDA10A, and detection wavelength is 200-1100nm, bandwidth range 0-180MHZ, minimum equivalent noise power 3.5 × 10
-11w/Hz
1/2, fully the light signal after modulation is converted into the signal of telecommunication and exports.
Described analog signal amplification module comprises fixed voltage and amplifies and amplify conditioned circuit, described fixed voltage amplifies the signal of pick-up probe, small-signal is carried out voltage amplification, through amplifying the input signal of conditioned circuit as AD acquisition module, the Amplifier Model of described amplification conditioned circuit is AD8250, there is wide power voltage scope, digital or pin-programmable, programmable-gain: 1,2,5,10.
Described single-ended transfer difference module receives the analog signal after amplifying, and realizes single-ended transfer difference signal.
Described AD acquisition module receives the analog signal after single-ended transfer difference module converts, FPGA exports control signal, control AD acquisition module gathers, and result is inputted FPGA control and processing module, described AD acquisition module adopts AD8138 and AD9220 chip cascade, and AD8138 realizes the single-ended conversion to difference and common mode electrical level displacement, analog input scope-4.7V-3.4V, have the sample rate of 10MHz, 12 bit digital export.
The control chip model of described USB transport module selects CY7C68013A-56PVXI, is responsible for being controlled by FPGA with processing module collection and data after processing are sent to Labview display module shows.
Described power module comprises adjustable digital power supply, analog power and digital power, for other modules are powered.
The beneficial effect that compared with prior art the present invention has is:
1) analog control signal of digital servo-control and reference signal produce under the same frequency control word of same FPGA, ensure the consistency of frequency, and the phase-locked resultant error of system digits is little;
2) change frequency control word, can realize finely tuning frequency of phase locking, play when light modulation resonant frequency of a crystal drifts about phase-locked in new resonance frequency with realization during employing different bullet luminescent crystal, applying flexible is convenient;
3) system AD gathers the reference clock of drive singal and reference signal in clock and DDS is same clock, ensures stablizing of analog signal and reference signal relative phase, has higher accuracy, stability;
4) system 1,2,3 frequency multiplication reference frequency, as long as main control chip FPGA resource meets, can realize more that multiple frequence is phase-locked, circuit has larger application space;
5) circuit adopts FPGA to control, and the structure of Labview display, data acquisition process is carried out with transmission simultaneously, and circuit has higher efficiency.
Accompanying drawing explanation
Below by accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is digital servo-control circuit block diagram;
Fig. 2 is high drive modular circuit schematic diagram;
Fig. 3 is for playing light modulation light path principle figure;
Fig. 4 is that analog signal is amplified and AD Acquisition Circuit block diagram;
Fig. 5 is that FPGA controls and data process diagram;
Fig. 6 is FPGA and USB data transmission module frame chart.
In figure: 1 for FPGA control be high drive module, 3 with processing module, 2 to be detector for playing optical modulator, 4,5 be analog signal amplification module, 6 be single-ended transfer difference module, 7 be AD acquisition module, 8 be USB transport module, 9 be Labview display module, 10 be power module, 11 be power amplification circuit, 12 to be charging and discharging circuit, 13 be impedance matching circuits, 14 amplify, 15 for amplify conditioned circuit for fixed voltage.
Embodiment
The present invention is further detailed explanation by reference to the accompanying drawings for embodiment below.
As shown in Figures 1 to 6, a kind of structure of the highly sensitive digital PLL for playing light modulation, comprise: power amplifier module 11, receive FPGA and control the control signal with processing module 1, the frequency of the signal controlling driving voltage that FPGA exports, play optical modulator 3 and be operated in resonance condition, pumping signal is amplified, for charging and discharging circuit 12 provides enough large power signal; Charging and discharging circuit 12, for LC concussion provides charging and discharging loop; Impedance matching circuit 13, matches inductance L and electric capacity C, makes load circuit resonance, by realizing resonance and voltage amplification to the charging and discharging of electric capacity C; Analog signal amplification module 5, the signal of pick-up probe 4, carries out voltage amplification by small-signal, as the input signal of AD acquisition module 7; Single-ended transfer difference module 6, receives the analog signal after amplifying, realizes single-ended transfer difference signal; AD acquisition module 7, receives the analog signal after amplifying, and FPGA provides clock for AD, and controls AD gathers, and the signal after changing is sent to FPGA; FPGA controls and data processing module 1, controls high drive module 2, analog signal amplification module 5, AD acquisition module 7, is sent after the data processing of adopting back by USB; USB data transmission module 8, is responsible for FPGA to gather and data after processing, is sent to Labview display module 9 and shows; Power module 10 is other module for power supply of circuit.
Preferably, the bullet light modulation crystal of described bullet optical modulator 3 is zinc selenide, has good permeability, modulation rate is high, good stability, spectral region be large near, intermediate infrared radiation.
Preferably, described detector 4 model is PDA10A, it is characterized in that, detection wavelength is 200-1100nm, bandwidth range 0-180MHZ, minimum equivalent noise power 3.5 × 10
-11w/Hz
1/2, fully the light signal after modulation is converted into the signal of telecommunication and exports.
Preferably, described high drive module 2 is designed to a kind of high-voltage driving circuit based on LC resonance step-up principle, and Q value is high, and output voltage is high, good stability, and carrying load ability is strong, and driving voltage frequency is controlled.
Preferably, the Amplifier Model in described analog signal amplification module 5 is AD8250, wide power voltage scope, digital or pin-programmable, programmable-gain: 1,2,5,10.
Preferably, described AD acquisition module 7 adopts AD8138 and AD9220 chip cascade, and AD8138 realizes the single-ended conversion to difference and common mode electrical level displacement, and analog input scope-4.7V-3.4V, has the sample rate of 10MHz, and 12 bit digital export.
Preferably, it is EP1C6Q240C8 that described FPGA controls with the chip model of processing module 1, carries out drived control, AD data acquisition and controlling to drive circuit, the data of collection and the inner signal produced are carried out the process of multiply accumulating quadratic sum again, then pass to Labview by USB interface.
Preferably, the control chip model of described USB transport module 8 is the read-write setting of CY7C68013A-56PVXI, FPGA control USB, the data that a upper cycle obtains is sent completely in the new one-period of data processing.
Below in conjunction with concrete accompanying drawing, the present invention is further described in more detail.
As shown in Figure 1, the invention provides a kind of drived control based on FPGA and digital servo-control hardware circuit, mainly comprise power amplification circuit 11, charging and discharging circuit 12, impedance matching circuit 13, amplifying circuit of analog signal 5, single-ended transfer difference module 6, AD acquisition module 7, FPGA control and processing module 1, USB transport module 8.The control end of high drive module 2 is connected with FPGA, drive singal output is connected with bullet optical modulator 3, the input that modulating output and the fixed voltage of detector 4 amplify 14 is connected, the input that output after voltage fixes amplification and signal amplify conditioned circuit 15 is connected, signal after amplification is connected with the input of single-ended transfer difference module 6 conversion chip AD8138, output after signal differential conversion is connected with the input of A/D chip, under the control that FPGA controls with processing module 1, excitation is provided to high drive module 2, AD collection is carried out to after the modulating output process of detector 4, data are through the multiply accumulating of FPGA again after quadratic sum process, be buffered in internal register, pass through USB interface again, result is transferred to Labview display.
As shown in Figure 2, for high drive modular circuit schematic diagram, in figure, Q4 selects 2N5551 and R3, R11 to form total radio amplifier, and the base stage of Q4 meets FPGA and controls, Q1 selects 2N5551, CR2 to select 1N4935 and R3 to form common-collector amplifier, thus achieves power amplification function.Q5 selects TIP31, and Q5 base stage connects Q4 emitting stage and meets R10 again and connect Q4 base stage, and under same FPGA signal controlling, Q3 selects TIP31 and Q1, CR2 to form charge circuit, and Q4 and Q5, CR4 form discharge loop.L2 selects fixing inductance value, and select suitable electric capacity mate to be connected in series with L2 and realize impedance matching according to playing the resonance frequency of luminescent crystal, and jointly form oscillator amplifier circuit with CR1, CR5, its high-voltage output end accesses bullet optical modulator as driving.
As shown in Figure 3, for playing light modulation light path system, laser incident wavelength is He-Ne laser of 632.8nm, laser signal rises through the polarizer and partially enters bullet luminescent crystal, modulated under drive singal effect, signal after modulation is received by detector 4 through analyzer, and the model of detector 4 is PDA10A, and the signal of telecommunication that detector 4 obtains after changing is as the input of analog signal amplification module 5.
As shown in Figure 4, for analog signal is amplified and AD Acquisition Circuit block diagram, the analog signal that detector 4 exports is linked into Digitally programmable amplifier AD8250 through the preliminary voltage amplification that OP27 is fixing, FPGA sends control signal, wherein 6 control signals respectively with 3 grades of cascades after the A0 of amplifier, A1 connects, an other signal is connected with the clock signal AD_CLK of A/D chip AD9220, modulating output OUT after 3 grades of amplifications, after low distortion difference ADC driver AD8138 difference processing, be connected with the analog input of AD, under the control of FPGA, AD conversion exports and is connected with the IO pin of FPGA, data are sent to FPGA.
As shown in Figure 5, for FPGA controls and data process diagram, AD conversion exports, data buffer storage is to FPGA, while FPGA gathers AD data, inner at FPGA, under gathering same clock control with AD, high drive pumping signal, with 1 of the synchronous sine of pumping signal and cosine signal, 2, 3 frequencys multiplication, amplitude amount corresponding under taking out corresponding phase respectively, be multiplied as the signal adopted back with AD respectively with reference to signal is corresponding, each cycle gathers 64 points, correspondence adds up after being multiplied respectively mutually again respectively, cumulative 10000 cycles, after having added up again respectively square, by the sine under identical frequency multiplication and the results added after cosine square, obtain 1, 2, the digital servo-control result of 3 frequencys multiplication, according to required precision, what each cycle gathered counts and cumulative periodicity adjustable, according to the resonance frequency of difference bullet luminescent crystal, play the resonance frequency after luminescent crystal drift, the frequency control word of fine setting DDS, bullet light modulation and digital servo-control effect are adjusted to the best.
As shown in Figure 6, for FPGA and USB data transmission circuit module block diagram, the model of FPGA is EP1C6Q240C8, the model of USB control chip is CY7C68013A-56PVXI, the FLAGA of USB control chip, FLAGB, FLAGC pin, INT0, INT1 pin, ADD0, ADD1 pin, SLRD, SLWR pin, D0 to D15 pin, SLOE, SLCS, IFCLK, WU2, PKEND pin, be connected with the I/O port of FPGA, FPGA provides a triggering signal to USB control chip, FPGA sends read-write SLRD, SLWR, USB control chip receives read-write, by D0 to D15, data are sent to USB control chip, the SCL be connected with USB, data are sent to Labview by SDA, FPGA is by IFCLK control data transmission speed, data are transmitted before next data processing terminates.
Claims (10)
1. one kind for playing the digital servo-control hardware circuit of light modulation, it is characterized in that: comprise FPGA and control and processing module (1), high drive module (2), play optical modulator (3), detector (4), analog signal amplification module (5), single-ended transfer difference module (6), AD acquisition module (7), USB transport module (8), Labview display module (9) and power module (10), described FPGA controls and processing module (1), high drive module (2), play optical modulator (3), detector (4), analog signal amplification module (5), single-ended transfer difference module (6), AD acquisition module (7) connects successively, described AD acquisition module (7) and FPGA control to be connected with processing module (1), described FPGA controls to be connected with Labview display module (9) by USB transport module (8) with processing module (1).
2. a kind of digital servo-control hardware circuit for playing light modulation according to claim 1, it is characterized in that: described FPGA controls to select EP1C6Q240C8 with the chip of processing module (1), control high drive module (2), analog signal amplification module (5) and AD acquisition module (7), output to Labview display module (9) by after the data processing of adopting back by USB transport module (8).
3. a kind of digital servo-control hardware circuit for playing light modulation according to claim 1, it is characterized in that: described high drive module (2) comprises power amplification circuit (11), charging and discharging circuit (12) and impedance matching circuit (13), described power amplification circuit (11) receives FPGA and controls the control signal with processing module (1), described charging and discharging circuit (12) provides charging and discharging loop for LC shakes, inductance L and electric capacity C match by described impedance matching circuit (13), make load circuit resonance, by realizing resonance and voltage amplification to the charging and discharging of electric capacity C.
4. a kind of digital servo-control hardware circuit for playing light modulation according to claim 1, it is characterized in that: the bullet luminescent crystal of described bullet optical modulator (3) is zinc selenide, under the control that FPGA controls with processing module (1), be operated in resonance condition.
5. a kind of digital servo-control hardware circuit for playing light modulation according to claim 1, it is characterized in that: the model of described detector (4) is PDA10A, detection wavelength is 200-1100nm, bandwidth range 0-180MHZ, minimum equivalent noise power 3.5 × 10
-11w/Hz
1/2, fully the light signal after modulation is converted into the signal of telecommunication and exports.
6. a kind of digital servo-control hardware circuit for playing light modulation according to claim 1, it is characterized in that: described analog signal amplification module (5) comprises fixed voltage and amplifies (14) and amplify conditioned circuit (15), described fixed voltage amplifies the signal of (14) pick-up probe (4), small-signal is carried out voltage amplification, through amplifying the input signal of conditioned circuit (15) as AD acquisition module (7), the Amplifier Model of described amplification conditioned circuit (15) is AD8250, there is wide power voltage scope, digital or pin-programmable, programmable-gain: 1, 2, 5, 10.
7. a kind of digital servo-control hardware circuit for playing light modulation according to claim 1, is characterized in that: described single-ended transfer difference module (6) receives the analog signal after amplification, realizes single-ended transfer difference signal.
8. a kind of digital servo-control hardware circuit for playing light modulation according to claim 1, it is characterized in that: described AD acquisition module (7) receives the analog signal after single-ended transfer difference module (6) conversion, FPGA exports control signal, control AD acquisition module (7) gathers, and result is inputted FPGA control and processing module (1), described AD acquisition module (7) adopts AD8138 and AD9220 chip cascade, AD8138 realizes the single-ended conversion to difference and common mode electrical level displacement, analog input scope-4.7V-3.4V, there is the sample rate of 10MHz, 12 bit digital export.
9. a kind of digital servo-control hardware circuit for playing light modulation according to claim 1, it is characterized in that: the control chip model of described USB transport module (8) selects CY7C68013A-56PVXI, be responsible for FPGA being controlled gather with processing module (1) and data after processing are sent to Labview display module (9) shows.
10. a kind of digital servo-control hardware circuit for playing light modulation according to claim 1, is characterized in that: described power module (10) comprises adjustable digital power supply, analog power and digital power, for other modules are powered.
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Cited By (2)
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| CN106354052A (en) * | 2016-08-04 | 2017-01-25 | 北京航空航天大学 | Photoelastic-modulation controller for atom laser gyroscopes |
| CN109445353A (en) * | 2018-12-12 | 2019-03-08 | 江苏集萃微纳自动化系统与装备技术研究所有限公司 | Digital ultrasound power driving circuit |
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Application publication date: 20151007 |