CN103066485B - Filter drive circuit of swept source - Google Patents
Filter drive circuit of swept source Download PDFInfo
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- CN103066485B CN103066485B CN201210540813.0A CN201210540813A CN103066485B CN 103066485 B CN103066485 B CN 103066485B CN 201210540813 A CN201210540813 A CN 201210540813A CN 103066485 B CN103066485 B CN 103066485B
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Abstract
The invention provides a filter drive circuit of a swept source. The filter drive circuit of the swept source comprises a signal generating circuit, a filter circuit, a gain adjusting circuit and a filter load, wherein the signal generating circuit is used for generating sine wave signals, an input end of the filter circuit is connected with an output end of the signal generating circuit, the filter circuit is used for filtering noise beyond a sine wave signal band, an input end of the gain adjusting circuit is connected with an output end of the filter circuit, an output end of the gain adjusting circuit is connected with the filter load, and the gain adjusting circuit is used for amplifying the mixed wave form of the sine wave signals and narrow band noise. According to the filter drive circuit of the swept source, output frequency of the swept source can be continuously adjustable between 20 KHz and 200 KHz, peak-to-peak value voltage can be 3 V, phase is adjustable, and output load is about 1 omega. Filter load stability is guaranteed, the requirements on modulation amplitude of different laser devices are met, and sweep frequency laser wavelength can be coordinated.
Description
Technical field
The present invention relates to frequency sweep optical coherent chromatographic imaging and sensory field of optic fibre, particularly a kind of filter drive circuit of swept light source.
Background technology
Swept light source is the light source that timesharing exports different wave length monochromatic wave in time domain, it is by the rapid scanning of narrowband wavelength filter, at a time only the monochromatic wave of a certain fixed wave length is parsed from broadband spectral, to realize quick, narrow instantaneous live width and linear broadband frequency sweep output, the fields such as optical coherence tomography (Optical Coherence Tomography is called for short OCT) and Fibre Optical Sensor can be widely used in.Wherein, as the Primary Component of swept light source, the parameter of driving to swept light source of filter is most important.
Realize swept light source, one of mode changes cavity length to reach the tunable of sweeping laser wavelength by the deformation of filter; Need like this to add different frequency and different voltage to filter, to reach the different modulation amplitude of laser.According to filter characteristic, the requirement of swept light source fast wave long scan be reached, need in real system to the pumping signal of filter plus signal frequency more than 50KHz, but existing signal generation apparatus cannot meet this demand.
The existing device that can be used as filter drive singal is divided into two kinds, one is that peak-to-peak value is adjustable, frequency-adjustable, but output current power is lower, output impedance generally can only reach 50 ohms, stabilized driving cannot run the filter driver of similar signal generator in high frequency; Be the production filter driver designed by filter vendor, this driver has frequency-adjustable, the features such as working stability, but program output waveform frequency is inadequate.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of filter drive circuit of swept light source, the frequency that it is exported can between 20KHz to 200KHz continuously adjustabe, peak-to-peak value voltage can reach 3V, and phase place is also adjustable, and its output loading is about 1 Europe.
For realizing above function, the present invention is achieved by the following technical programs:
A filter drive circuit for swept light source, includes signal generating circuit, filter circuit, gain adjustment circuit and filter load;
Described signal generating circuit, for generation of sine wave signal, described sine wave signal amplitude is consistent, frequency-adjustable;
The input of described filter circuit is connected to the output of described signal generating circuit, and this filter circuit is used for the noise beyond sine wave signal frequency band described in filtering, and the hybrid waveform of sine wave output signal and narrow-band noise;
The input of described gain adjustment circuit is connected with the output of described filter circuit, and the output of described gain adjustment circuit connects filter load; This gain adjustment circuit is used for amplifying the hybrid waveform of described sine wave signal and narrow-band noise, sine wave output amplifying signal.
After described signal generating circuit, comprise phase bias Circuit tuning further, the output of described phase bias Circuit tuning is connected to the input of described filter circuit, and described phase bias Circuit tuning is used for entering horizontal phasing control to described sine wave signal.
Described phase bias Circuit tuning adopts external adder circuit to realize.
Described signal generating circuit is sinusoidal oscillator or Direct Digital Synthesizer;
The frequency of method to described sinusoidal oscillator that described sinusoidal oscillator utilizes master controller to adjust frequency of oscillation in real time adjusts.
Described filter circuit is active filter or passive filter; Described filter circuit is low pass circuit or band-pass circuit.
Described gain adjustment circuit is amplifying circuit or auto-gain circuit.
The output of described gain adjustment circuit is connected with the driving intensifier circuit comprising amplifier further, and the output of this driving intensifier circuit connects filter load.
Described driving intensifier circuit comprises amplifier Circuit tuning further, and described amplifier Circuit tuning, for controlling the amplifier of described driving intensifier circuit, can be stablized under unit gain.
The output of described driving intensifier circuit is connected with thermostat module further, and described filter load is placed in the insulating box of this thermostat module; Described thermostat module, by gathering the actual temperature of filter load, regulates the temperature of described filter load.
Described thermostat module comprises controlled source, design temperature circuit, temperature sensor, temperature controller, thermoregulator and insulating box;
Described design temperature circuit, temperature sensor, temperature controller, thermoregulator and insulating box are all connected to described controlled source;
Described design temperature circuit is connected with described temperature controller respectively with described temperature sensor, and described temperature controller, thermoregulator and insulating box connect successively; Described filter load is located in described insulating box.
The present invention by providing a kind of filter drive circuit of swept light source, the frequency that it is exported can between 20KHz to 200KHz continuously adjustabe, peak-to-peak value voltage can reach 3V, and phase place is also adjustable, and its output loading is about 1 Europe; Ensure that the stability of filter load, meet the requirement of various lasers to modulation amplitude, reach the tunable of sweeping laser wavelength.
Accompanying drawing explanation
Fig. 1 is the filter drive circuit block diagram of one embodiment of the invention;
Fig. 2 is the sinusoidal oscillator of one embodiment of the invention;
Fig. 3 is the active second-order filter circuit of one embodiment of the invention;
Fig. 4 is the passive first order RC low-pass filter circuit of one embodiment of the invention;
Fig. 5 is the amplifying circuit of one embodiment of the invention;
Fig. 6 is the auto-gain circuit theory diagram of one embodiment of the invention;
Fig. 7 is the filter drive circuit block diagram of second embodiment of the invention;
Fig. 8 is the driving intensifier circuit of second embodiment of the invention;
Fig. 9 is another driving intensifier circuit of second embodiment of the invention;
Figure 10 is the amplifier Circuit tuning of second embodiment of the invention;
Figure 11 is the filter drive circuit block diagram of third embodiment of the invention.
Embodiment
Under regard to the filter drive circuit of a kind of swept light source proposed by the invention, describe in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1:
As shown in Figure 1, the present embodiment provides a kind of filter drive circuit of swept light source, includes signal generating circuit, filter circuit, gain adjustment circuit and filter load;
Described signal generating circuit, for generation of sine wave signal, described sine wave signal amplitude is consistent, frequency-adjustable;
The input of described filter circuit is connected to the output of described signal generating circuit, and this filter circuit is used for the noise beyond sine wave signal frequency band described in filtering, and the hybrid waveform of sine wave output signal and narrow-band noise;
The input of described gain adjustment circuit is connected with the output of described filter circuit, and the output of described gain adjustment circuit connects filter load; This gain adjustment circuit is used for amplifying the hybrid waveform of described sine wave signal and narrow-band noise, sine wave output amplifying signal.
Described signal generating circuit is sinusoidal oscillator or Direct Digital Synthesizer; The frequency of method to described sinusoidal oscillator that described sinusoidal oscillator utilizes master controller to adjust frequency of oscillation in real time adjusts.
As shown in Figure 2, described sinusoidal oscillator comprises a bipolar operational amplifier 1, and the in-phase end of this bipolar operational amplifier 1 is connected with resistance R1, electric capacity C1, the other end ground connection of described resistance R1, electric capacity C1; The in-phase end of this bipolar operational amplifier 1 feed back to routing capacitance C2, resistance R2 is in series; Ground connection after the end of oppisite phase of this bipolar operational amplifier 1 is connected with resistance R3, and the end of oppisite phase of this bipolar operational amplifier 1 is connected to output V after being connected with resistance R4
o; The frequency of oscillation W=1/RC of described sinusoidal oscillator, is determined by the RC series network with selecting frequency characteristic; Namely by resistance R1, electric capacity C1 and electric capacity C2, the product of resistance R2 determines.The starting condition for oscillation of described sinusoidal oscillator is A>3, namely requires that the voltage gain of amplifier is more than or equal to 3, and the reason slightly larger than 3 is due to the various losses in circuit, causes amplitude decline and recompense.But A is more much bigger than 3 can cause sine wave output deformation poor; Similar principle, typical sinusoidal oscillator also can by fet oscillator or capacitance connecting three point type oscillator, and inductance connecting three point type forms.
Because described filter drive circuit needs to have adjustable frequency function, therefore need the frequency of oscillation of offset of sinusoidal oscillator to carry out dynamic conditioning, namely need the resistance R1 shown in Fig. 2, electric capacity C1, electric capacity C2, resistance R2 adjusts; The method utilizing described master controller to adjust frequency of oscillation in real time in the present embodiment adjusts in real time to frequency of oscillation; The method is that the resistance R1 in Fig. 2 and resistance R2 is replaced with digital regulation resistance, and digital regulation resistance is the resistance of a kind of digital adjustable, can change parameter in real time easily; For ensureing accurate frequency of oscillation, need precision resister be selected, needing the precision within 1%, low gain error can be provided in whole resistance range.
Can be adjusted easily frequency, phase place by Direct Digital Synthesizer DDS, and control precision is high, frequency error factor speed fast, phase place can freely adjust.
The waveform produced due to sinusoidal oscillator or Direct Digital Synthesizer is that amplitude is consistent, the sine wave signal of frequency-adjustable, then also need through phase bias Circuit tuning, phase bias Circuit tuning is comprised further after described signal generating circuit, the output of described phase bias Circuit tuning is connected to the input of described filter circuit, and described phase bias Circuit tuning is used for entering horizontal phasing control to described sine wave signal; Described phase bias Circuit tuning adopts external adder circuit to realize, and due to comparatively general, is not therefore repeated in the present embodiment.
Described filter circuit is active filter or passive filter; Described filter circuit is low pass circuit or band-pass circuit, common circuit is active second-order filter circuit and typical passive first order RC low-pass filter circuit, described active second-order filter circuit is typical Sallen-Key low-pass filter circuit connection, and its annexation as shown in Figure 3; This operational amplifier 2 excites for homophase, and the input impedance of filter is higher, and output impedance is lower, and circuit performance is stablized, and gain easily adjusts.Also the filter of band pass filter or other exponent number can be formed through similar design.
The annexation of described passive first order RC low-pass filter circuit as shown in Figure 4; This low pass filter can provide the speed of roll-offing of 20db after corner frequency, and similar design also can form LC low pass circuit, LC bandwidth-limited circuit; Wherein, the time constant be made up of resistance R9 and electric capacity C5 forms the corner frequency of this low pass filter.
Described filter circuit can suppress the out-of-band noise of described sine wave signal, reduces the problem such as wave distortion, hydraulic performance decline.
Described gain adjustment circuit is amplifying circuit or auto-gain circuit.Be illustrated in figure 5 amplifying circuit; Signal amplification can be carried out by in-phase amplification circuit or see-saw circuit; In adjustment figure, feedback resistance R12 can change multiplication factor and then control the peak-to-peak value amplitude of filter driver output waveform; In-phase amplification circuit and the difference of see-saw circuit are that the output signal of in-phase amplification circuit is identical with the phase place of input signal, and see-saw circuit then differs 180 degree.
Be illustrated in figure 6 auto-gain circuit (AGC) theory diagram; By the voltage of control G+, G-, the output waveform of amplifier circuit can be changed in real time.
Embodiment 2:
The filter drive circuit of a kind of swept light source that the present embodiment provides is identical with technical scheme described in embodiment 1, as shown in Figure 7, just the output of described gain adjustment circuit is connected with the driving intensifier circuit comprising amplifier further, and the output of this driving intensifier circuit connects filter load; This driving intensifier circuit, for reducing the impedance of described sinusoidal wave amplifying signal, strengthens driving force.
Through the drive circuit described in embodiment 1, obtained satisfactory signal waveform, but the amplifier of described gain adjustment circuit exports often output resistance, and comparatively greatly, driving force is not enough.Drive high frequency capacitive load, need special driving intensifier circuit, it is little that this circuit has output impedance, and gain bandwidth product is large, supports the features such as bi-polar high voltage driving.
Fig. 8 and Fig. 9 is two kinds of driving intensifier circuits.As shown in Figure 8, be adopt the method for amplifier host-slave parallel to carry out driving to strengthen; By the given end of oppisite phase being linked into amplifier 5, R13 one end ground connection, the in-phase end of other end concatenation operation amplifier 5; The output of described operational amplifier 5 is connected with the in-phase end of operational amplifier 6, and described operational amplifier 6 is homophase follower connection, accesses load resistance R15 after being connected by balance resistance R16 with resistance R17 with the resistance R14 of operational amplifier 5 in-phase end.Fig. 9 adopts the outside circuit that promotes to carry out driving enhancing; What adopt is the push-pull connection method accessing triode after operational amplifier 7; Resistance R18, resistance R19 and resistance R23 are used for matched static balance point, and resistance R20, resistance R21 and resistance R22 are current-limiting resistances; Electric capacity C6, as building-out capacitor, regulates frequency and the phase characteristic of amplifier.
It is specifically intended that, some amplifiers cannot be stable with voltage-tracing pattern, and therefore, described driving intensifier circuit comprises amplifier Circuit tuning further, described amplifier Circuit tuning, for controlling the amplifier of described driving intensifier circuit, can be stablized under unit gain.
Described amplifier Circuit tuning as shown in Figure 10, the anti-phase connection of amplifier of employing, resistance R24 and electric capacity C8 access the end of oppisite phase of operational amplifier 14, and resistance R25 and electric capacity C7 accesses in the feedback control loop of operational amplifier 14 and regulates cut-off frequency; Simultaneously when low gain, the noise of amplifier also will balance the noise of different frequency by control capacittance C7, electric capacity C8, resistance R24 and resistance R25; Make operational amplifier stable under unit gain by adjustment electric capacity C7, electric capacity C8; Also small-signal response method can be adopted in addition to be in systems in practice optimized circuit parameter.
Embodiment 3:
In actual motion, have strict requirement to the stability of filter, in numerous influencing factor, temperature plays an important role.Therefore need to add thermostat module to ensure the consistency of temperature.The filter drive circuit of a kind of swept light source that the present embodiment provides, on the basis of above embodiment, as shown in figure 11, the output of described driving intensifier circuit is connected with thermostat module further, and described filter load is placed in the insulating box of this thermostat module; Described thermostat module, by gathering the actual temperature of filter load, regulates the temperature of described filter load, to ensure the temperature stabilization of described filter.
Described thermostat module comprises controlled source, design temperature circuit, temperature sensor, temperature controller, thermoregulator and insulating box;
Described temperature controller comprises subtracter, proportional amplifier, integral amplifier, differentiating amplifier, adder;
Described design temperature circuit, temperature sensor, temperature controller, thermoregulator and insulating box are all connected to described controlled source;
Described design temperature circuit is connected with described temperature controller respectively with described temperature sensor, and described temperature controller, thermoregulator and insulating box connect successively; Described filter load is located in described insulating box.
Drawn by above embodiment, the present invention by providing a kind of filter drive circuit of swept light source, the frequency that it is exported can between 20KHz to 200KHz continuously adjustabe, peak-to-peak value voltage can reach 3V, and phase place is also adjustable, and its output loading is about 1 Europe; Ensure that the stability of filter load, meet the requirement of various lasers to modulation amplitude, reach the tunable of sweeping laser wavelength.
Above execution mode is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (8)
1. a filter drive circuit for swept light source, is characterized in that, includes signal generating circuit, filter circuit, gain adjustment circuit and filter load;
Described signal generating circuit, for generation of sine wave signal, described sine wave signal amplitude is consistent, frequency-adjustable;
The input of described filter circuit is connected to the output of described signal generating circuit, and this filter circuit is used for the noise beyond sine wave signal frequency band described in filtering, and the hybrid waveform of sine wave output signal and narrow-band noise;
The input of described gain adjustment circuit is connected with the output of described filter circuit, and the output of described gain adjustment circuit is connected with the driving intensifier circuit comprising amplifier, and the output of this driving intensifier circuit connects filter load; This gain adjustment circuit is used for amplifying the hybrid waveform of described sine wave signal and narrow-band noise, sine wave output amplifying signal;
Described driving intensifier circuit comprises amplifier Circuit tuning further, and described amplifier Circuit tuning, for controlling the amplifier of described driving intensifier circuit, can be stablized under unit gain;
Frequency continuously adjustabe between 20kHz to 200kHz that described filter drive circuit exports, peak-to-peak value voltage can reach 3V, phase-adjustable, and output loading is about 1 Europe.
2. drive circuit as claimed in claim 1, it is characterized in that, phase bias Circuit tuning is comprised further after described signal generating circuit, the output of described phase bias Circuit tuning is connected to the input of described filter circuit, and described phase bias Circuit tuning is used for entering horizontal phasing control to described sine wave signal.
3. drive circuit as claimed in claim 2, it is characterized in that, described phase bias Circuit tuning adopts external adder circuit to realize.
4. the drive circuit as described in any one of claims 1 to 3, is characterized in that, described signal generating circuit is sinusoidal oscillator or Direct Digital Synthesizer;
The frequency of method to described sinusoidal oscillator that described sinusoidal oscillator utilizes master controller to adjust frequency of oscillation in real time adjusts.
5. drive circuit as claimed in claim 1, it is characterized in that, described filter circuit is active filter or passive filter; Described filter circuit is low pass circuit or band-pass circuit.
6. drive circuit as claimed in claim 1, it is characterized in that, described gain adjustment circuit is amplifying circuit or auto-gain circuit.
7. drive circuit as claimed in claim 1, it is characterized in that, the output of described driving intensifier circuit is connected with thermostat module further, and described filter load is placed in the insulating box of this thermostat module; Described thermostat module, by gathering the actual temperature of filter load, regulates the temperature of described filter load.
8. drive circuit as claimed in claim 7, it is characterized in that, described thermostat module comprises controlled source, design temperature circuit, temperature sensor, temperature controller, thermoregulator and insulating box;
Described design temperature circuit, temperature sensor, temperature controller, thermoregulator and insulating box are all connected to described controlled source;
Described design temperature circuit is connected with described temperature controller respectively with described temperature sensor, and described temperature controller, thermoregulator and insulating box connect successively; Described filter load is located in described insulating box.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210540813.0A CN103066485B (en) | 2012-12-13 | 2012-12-13 | Filter drive circuit of swept source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210540813.0A CN103066485B (en) | 2012-12-13 | 2012-12-13 | Filter drive circuit of swept source |
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| CN103066485A CN103066485A (en) | 2013-04-24 |
| CN103066485B true CN103066485B (en) | 2015-03-25 |
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| CN104808552B (en) * | 2015-04-20 | 2017-11-10 | 吉林大学 | The drive dynamic control device of piezo jet spot gluing equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2258327Y (en) * | 1996-06-28 | 1997-07-23 | 清华大学 | High-resolution and broadband linear frequency-scanning signal resource |
| CN201409244Y (en) * | 2009-04-01 | 2010-02-17 | 中国科学技术大学 | LED constant-current drive circuit taking optical coupler as voltage reference and comparison amplifier |
| EP2523345A2 (en) * | 2011-05-10 | 2012-11-14 | Honeywell International Inc. | Apparatus and methods for high voltage amplification with low noise |
| CN203014759U (en) * | 2012-12-13 | 2013-06-19 | 乐普（北京）医疗器械股份有限公司 | Filter drive circuit of swept source |
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2012
- 2012-12-13 CN CN201210540813.0A patent/CN103066485B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2258327Y (en) * | 1996-06-28 | 1997-07-23 | 清华大学 | High-resolution and broadband linear frequency-scanning signal resource |
| CN201409244Y (en) * | 2009-04-01 | 2010-02-17 | 中国科学技术大学 | LED constant-current drive circuit taking optical coupler as voltage reference and comparison amplifier |
| EP2523345A2 (en) * | 2011-05-10 | 2012-11-14 | Honeywell International Inc. | Apparatus and methods for high voltage amplification with low noise |
| CN203014759U (en) * | 2012-12-13 | 2013-06-19 | 乐普（北京）医疗器械股份有限公司 | Filter drive circuit of swept source |
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