CN105300506A - Driver of acousto-optic modulator - Google Patents
Driver of acousto-optic modulator Download PDFInfo
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- CN105300506A CN105300506A CN201510685992.0A CN201510685992A CN105300506A CN 105300506 A CN105300506 A CN 105300506A CN 201510685992 A CN201510685992 A CN 201510685992A CN 105300506 A CN105300506 A CN 105300506A
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Abstract
The invention relates to a driver of an acousto-optic modulator, and aims at solving the technical problem that a present acousto-optic modulator cannot accurately obtain orthogonal signals needed by a demodulation algorithm. The driver comprises a direct digital synthesizer, a controller, a current-to-voltage circuit, an orthogonal analog signal output interface and a pulse modulation circuit, wherein the output end of the controller is connected with the input end of the direct digital synthesizer, one output end of the direct digital synthesizer is connected with the input end of the current-to-voltage circuit, the output end of the current-to-voltage circuit is connected with the orthogonal analog signal output interface, and the other output end of the direct digital synthesizer is connected with the input end of the pulse modulation circuit. The driver can be widely applied to heterodyne type hydrophone systems.
Description
Technical field
The present invention relates to a kind of drive unit, especially relate to a kind of acousto-optic modulator drive unit.
Background technology
Fibre optic hydrophone is a kind of novel sensor be based upon on optical fiber, optoelectronic technology base.It is detected by highly sensitive coherent fiber, and underwater sound signal is changed into light signal.Fibre optic hydrophone can reflect the subtle change of light phase shift very delicately, but simultaneously also the linear relationship of asking of light phase shift and sound pressure signal is converted to the nonlinear relationship between light intensity and sound pressure signal, therefore, sound pressure signal must be extracted by signal receiving technology from fibre optic hydrophone output optical signal.
Signal detection technique is interference type optical fiber hydrophone is substantially the most also one of technology of most critical.The demodulation method of interference type optical fiber hydrophone is divided into homodyne demodulation method and the large class of heterodyne demodulation method two.Zero balancing is simple and easy to realize relatively, but the random drift of initial phase that the factors such as external environment disturbance cause can cause the weak of signal.The main method of current anti-phase fading is: 3x3 coupling mechanism and PGC modulation-demodulation technique etc.Process of heterodyning can modulate the signal to high frequency region, avoids the interference of low-frequency noise.Common process of heterodyning uses acousto-optic modulator to produce heterodyne signal.
At present, general acousto-optic modulator drive can under the effect of external signal production burst signal, thus excitation acousto-optic crsytal produces pulsed light.But for heterodyne system hydrophone system, be still faced with the orthogonal signal that cannot accurately obtain needed for demodulating algorithm, the frequency of these orthogonal signal is the difference on the frequency that two-way acousto-optic adjuster drives radiofrequency signal.
Summary of the invention
The present invention is exactly the technical matters that accurately cannot obtain the orthogonal signal needed for demodulating algorithm in order to solve existing acousto-optic modulator, provides a kind of acousto-optic modulator drive unit that accurately can obtain orthogonal signal needed for demodulating algorithm.
Acousto-optic modulator drive unit provided by the invention, comprise direct digital synthesiser, controller, electric current turn potential circuit, Quadrature analog signal output interface and pulse modulated circuit, the output terminal of controller is connected with the input end of described direct digital synthesiser, the input end that one road output terminal and the electric current of direct digital synthesiser turn potential circuit is connected, and the output terminal that electric current turns potential circuit is connected with Quadrature analog signal output interface; Another road output terminal of direct digital synthesiser is connected with the input end of pulse modulated circuit.
Preferably, also comprise power amplification circuit, impedance matching circuit, filtering circuit and radio frequency output signal interface, the output terminal of pulse modulated circuit is connected with the input end of power amplification circuit, the output terminal of power amplification circuit is connected with the input end of impedance matching circuit, and the output terminal of impedance matching circuit is connected with radio frequency output signal interface by filtering circuit.
Preferably, pulse modulated circuit is connected with pulse triggering signal interface.
Preferably, also comprise crystal oscillator, clock distributor and synchronous clock output interface, the output terminal of crystal oscillator is connected with the input end of clock distributor, and a road output terminal of clock distributor is connected with direct digital synthesiser, and another road output terminal of clock distributor is connected with synchronous clock output interface.
Preferably, direct digital synthesiser is 4 passage AD9959 chips of ADI company, and controller is the LPC2148 chip of NXP company, and clock distributor is the IDT5T9306 chip of Integrated Device Technology, Inc., and pulse modulated circuit is the analog switch NLASB3157 of ON company.
The invention has the beneficial effects as follows, structure of the present invention is simple, controller is adopted to add direct digital synthesiser as core, achieve the controlled Quadrature analog signal of frequency and acousto-optic modulator drive singal, solving the frequency that the general acousto-optic modulator of existing employing runs into is the inaccurate problem of orthogonal signal that two-way acousto-optic adjuster drives radio frequency signal frequency difference, improves system index; The invention provides external communication interface, clock synchronous and pulse triggering signal interface simultaneously, be convenient to the frequency of signal, phase place and amplitude and control, there is external synchronizing function, and control the pulse signal of heterodyne scheme.
Further aspect of the present invention, by the description of following embodiment, is clearly recorded.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Reference numeral illustrates:
1. direct digital synthesiser; 2. controller; 3. communication interface; 4. electric current turns potential circuit; 5. pulse modulated circuit; 6. power amplification circuit; 7. impedance matching circuit; 8. filtering circuit; 9. radio frequency output signal interface; 10. crystal oscillator; 11. clock distributors; 12. synchronous clock output interfaces; 13. Quadrature analog signal output interfaces; 14. pulse triggering signal interfaces.
Embodiment
Referring to accompanying drawing, with specific embodiment, the present invention is described in further detail.
As shown in Figure 1, acousto-optic modulator drive unit comprises direct digital synthesiser 1, controller 2, communication interface 3, electric current turns potential circuit 4, pulse modulated circuit 5, power amplification circuit 6, impedance matching circuit 7, filtering circuit 8, radio frequency output signal interface 9, crystal oscillator 10, clock distributor 11, synchronous clock output interface 12, Quadrature analog signal output interface 13 and pulse triggering signal interface 14, the output terminal of controller 2 is connected with a road input end of direct digital synthesiser 1, communication interface 3 is connected with the input end of controller 2, the input end that one road output terminal and the electric current of direct digital synthesiser 1 turn potential circuit 4 is connected, the output terminal that electric current turns potential circuit 4 is connected with Quadrature analog signal output interface 13, the output terminal of crystal oscillator 10 is connected with the input end of clock distributor 11, and a road output terminal of clock distributor 11 is connected with another road input end of direct digital synthesiser 1, and another road output terminal of clock distributor 11 is connected with synchronous clock output interface 12.
Another road output terminal of direct digital synthesiser 1 is connected with a road input end of pulse modulated circuit 5, another road input end of pulse modulated circuit 5 is connected with pulse triggering signal interface 14, the output terminal of pulse modulated circuit 5 is connected with the input end of power amplification circuit 6, the output terminal of power amplification circuit 6 is connected with the input end of impedance matching circuit 7, and the output terminal of impedance matching circuit 7 is connected with radio frequency output signal interface 9 by filtering circuit 8.
Direct digital synthesiser 1 realizes two-way Quadrature analog signal and the two-way acousto-optic modulator homogenous frequency signal of frequency-adjustable, and wherein, two-way acousto-optic modulator signal frequency is respectively f
aOM1and f
aOM2, there is identical phase place and amplitude; Two-way Quadrature analog signal frequency is all f mutually, two paths of signals phase 90 °.F, f
aOM1and f
aOM2relation is as follows: f=|f
aOM1-f
aOM2|.
Controller 2, for the control to direct digital synthesiser 1, provides the frequency needed for direct digital synthesiser 1, phase place and amplitude information.
Clock distributor 11 converts multipath clock to for the clock provided by crystal oscillator 10, and synchronous clock output interface 12 of leading up to is used as outside synchronous clock, and a road inputs for the clock of direct digital synthesiser 1.
Pulse modulated circuit 5, under the control of outside pulse triggering signal, realizes the pulsed modulation of acousto-optic modulator homogenous frequency signal.
The signal that Quadrature analog signal output interface 13 exports is that the current signal that direct digital synthesiser 1 exports turns through excess current the voltage signal that potential circuit 4 converts to.
Direct digital synthesiser 1 is DDS (DirectDigitalSynthesizer) device, can adopt 4 passage AD9959 chips of ADI company.
Controller 2 can be the devices such as FPGA or ARM, adopts the LPC2148 chip of NXP company in this example.
Clock distributor 11 can adopt the IDT5T9306 chip of Integrated Device Technology, Inc..
Crystal oscillator 10 can adopt the TXCO crystal oscillator SiT3821 of SiTime company.
Pulse modulated circuit 5 can adopt the analog switch NLASB3157 of ON company.
The above, only to the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Every in claim limited range of the present invention, any amendment made, equivalent replacement, improvement etc., all should within protection scope of the present invention.
Claims (5)
1. an acousto-optic modulator drive unit, it is characterized in that, comprise direct digital synthesiser, controller, electric current turn potential circuit, Quadrature analog signal output interface and pulse modulated circuit, the output terminal of controller is connected with the input end of described direct digital synthesiser, the input end that one road output terminal and the described electric current of described direct digital synthesiser turn potential circuit is connected, and the output terminal that described electric current turns potential circuit is connected with described Quadrature analog signal output interface; Another road output terminal of described direct digital synthesiser is connected with the input end of described pulse modulated circuit.
2. acousto-optic modulator drive unit according to claim 1, it is characterized in that, also comprise power amplification circuit, impedance matching circuit, filtering circuit and radio frequency output signal interface, the output terminal of described pulse modulated circuit is connected with the input end of described power amplification circuit, the output terminal of described power amplification circuit is connected with the input end of described impedance matching circuit, and the output terminal of described impedance matching circuit is connected with described radio frequency output signal interface by described filtering circuit.
3. acousto-optic modulator drive unit according to claim 2, is characterized in that, described pulse modulated circuit is connected with pulse triggering signal interface.
4. acousto-optic modulator drive unit according to claim 3, it is characterized in that, also comprise crystal oscillator, clock distributor and synchronous clock output interface, the output terminal of described crystal oscillator is connected with the input end of described clock distributor, one road output terminal of described clock distributor is connected with described direct digital synthesiser, and another road output terminal of described clock distributor is connected with described synchronous clock output interface.
5. acousto-optic modulator drive unit according to claim 4, it is characterized in that, described direct digital synthesiser is 4 passage AD9959 chips of ADI company, described controller is the LPC2148 chip of NXP company, described clock distributor is the IDT5T9306 chip of Integrated Device Technology, Inc., and described pulse modulated circuit is the analog switch NLASB3157 of ON company.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510685992.0A CN105300506A (en) | 2015-10-20 | 2015-10-20 | Driver of acousto-optic modulator |
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| CN201510685992.0A CN105300506A (en) | 2015-10-20 | 2015-10-20 | Driver of acousto-optic modulator |
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| CN105300506A true CN105300506A (en) | 2016-02-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247348A (en) * | 2017-08-04 | 2017-10-13 | 珠海任驰光电科技有限公司 | A kind of phase locked acousto-optic modulator drive device and method |
| CN108770139A (en) * | 2018-04-10 | 2018-11-06 | 北京大学 | A kind of acoustooptic modulator driver and its production method for optical fiber sensing system |
| CN112311470A (en) * | 2020-10-31 | 2021-02-02 | 中国电子科技集团公司第二十六研究所 | Control method based on double-AOM (automatic optical network management) cascade structure and acousto-optic cascade module |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247348A (en) * | 2017-08-04 | 2017-10-13 | 珠海任驰光电科技有限公司 | A kind of phase locked acousto-optic modulator drive device and method |
| CN107247348B (en) * | 2017-08-04 | 2023-04-28 | 珠海任驰光电科技有限公司 | Driving device and method for phase synchronous acousto-optic modulator |
| CN108770139A (en) * | 2018-04-10 | 2018-11-06 | 北京大学 | A kind of acoustooptic modulator driver and its production method for optical fiber sensing system |
| CN112311470A (en) * | 2020-10-31 | 2021-02-02 | 中国电子科技集团公司第二十六研究所 | Control method based on double-AOM (automatic optical network management) cascade structure and acousto-optic cascade module |
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Application publication date: 20160203 |